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• Procedural Generation of tile-based 2d World

  - by Matthias

  I am writing a 2d game that uses tile-based top-down graphics to build the world (i.e. the ground plane). Manually made this works fine. Now I want to generate the ground plane procedurally at run time. In other words: I want to place the tiles (their textures) randomised on the fly. Of course I cannot create an endless ground plane, so I need to restrict how far from the player character (on which the camera focuses on) I procedurally generate the ground floor. My approach would be like this: I have a 2d grid that stores all tiles of the floor at their correct x/y coordinates within the game world. When the players moves the character, therefore also the camera, I constantly check whether there are empty locations in my x/y map within a max. distance from the character, i.e. cells in my virtual grid that have no tile set. In such a case I place a new tile there. Therefore the player would always see the ground plane without gaps or empty spots. I guess that would work, but I am not sure whether that would be the best approach. Is there a better alternative, maybe even a best-practice for my case?

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• How I understood monads, part 1/2: sleepless and self-loathing in Seattle

  - by Bertrand Le Roy

  For some time now, I had been noticing some interest for monads, mostly in the form of unintelligible (to me) blog posts and comments saying “oh, yeah, that’s a monad” about random stuff as if it were absolutely obvious and if I didn’t know what they were talking about, I was probably an uneducated idiot, ignorant about the simplest and most fundamental concepts of functional programming. Fair enough, I am pretty much exactly that. Being the kind of guy who can spend eight years in college just to understand a few interesting concepts about the universe, I had to check it out and try to understand monads so that I too can say “oh, yeah, that’s a monad”. Man, was I hit hard in the face with the limitations of my own abstract thinking abilities. All the articles I could find about the subject seemed to be vaguely understandable at first but very quickly overloaded the very few concept slots I have available in my brain. They also seemed to be consistently using arcane notation that I was entirely unfamiliar with. It finally all clicked together one Friday afternoon during the team’s beer symposium when Louis was patient enough to break it down for me in a language I could understand (C#). I don’t know if being intoxicated helped. Feel free to read this with or without a drink in hand. So here it is in a nutshell: a monad allows you to manipulate stuff in interesting ways. Oh, OK, you might say. Yeah. Exactly. Let’s start with a trivial case: public static class Trivial { public static TResult Execute<T, TResult>( this T argument, Func<T, TResult> operation) { return operation(argument); } } This is not a monad. I removed most concepts here to start with something very simple. There is only one concept here: the idea of executing an operation on an object. This is of course trivial and it would actually be simpler to just apply that operation directly on the object. But please bear with me, this is our first baby step. Here’s how you use that thing: "some string" .Execute(s => s + " processed by trivial proto-monad.") .Execute(s => s + " And it's chainable!"); What we’re doing here is analogous to having an assembly chain in a factory: you can feed it raw material (the string here) and a number of machines that each implement a step in the manufacturing process and you can start building stuff. The Trivial class here represents the empty assembly chain, the conveyor belt if you will, but it doesn’t care what kind of raw material gets in, what gets out or what each machine is doing. It is pure process. A real monad will need a couple of additional concepts. Let’s say the conveyor belt needs the material to be processed to be contained in standardized boxes, just so that it can safely and efficiently be transported from machine to machine or so that tracking information can be attached to it. Each machine knows how to treat raw material or partly processed material, but it doesn’t know how to treat the boxes so the conveyor belt will have to extract the material from the box before feeding it into each machine, and it will have to box it back afterwards. This conveyor belt with boxes is essentially what a monad is. It has one method to box stuff, one to extract stuff from its box and one to feed stuff into a machine. So let’s reformulate the previous example but this time with the boxes, which will do nothing for the moment except containing stuff. public class Identity<T> { public Identity(T value) { Value = value; } public T Value { get; private set;} public static Identity<T> Unit(T value) { return new Identity<T>(value); } public static Identity<U> Bind<U>( Identity<T> argument, Func<T, Identity<U>> operation) { return operation(argument.Value); } } Now this is a true to the definition Monad, including the weird naming of the methods. It is the simplest monad, called the identity monad and of course it does nothing useful. Here’s how you use it: Identity<string>.Bind( Identity<string>.Unit("some string"), s => Identity<string>.Unit( s + " was processed by identity monad.")).Value That of course is seriously ugly. Note that the operation is responsible for re-boxing its result. That is a part of strict monads that I don’t quite get and I’ll take the liberty to lift that strange constraint in the next examples. To make this more readable and easier to use, let’s build a few extension methods: public static class IdentityExtensions { public static Identity<T> ToIdentity<T>(this T value) { return new Identity<T>(value); } public static Identity<U> Bind<T, U>( this Identity<T> argument, Func<T, U> operation) { return operation(argument.Value).ToIdentity(); } } With those, we can rewrite our code as follows: "some string".ToIdentity() .Bind(s => s + " was processed by monad extensions.") .Bind(s => s + " And it's chainable...") .Value; This is considerably simpler but still retains the qualities of a monad. But it is still pointless. Let’s look at a more useful example, the state monad, which is basically a monad where the boxes have a label. It’s useful to perform operations on arbitrary objects that have been enriched with an attached state object. public class Stateful<TValue, TState> { public Stateful(TValue value, TState state) { Value = value; State = state; } public TValue Value { get; private set; } public TState State { get; set; } } public static class StateExtensions { public static Stateful<TValue, TState> ToStateful<TValue, TState>( this TValue value, TState state) { return new Stateful<TValue, TState>(value, state); } public static Stateful<TResult, TState> Execute<TValue, TState, TResult>( this Stateful<TValue, TState> argument, Func<TValue, TResult> operation) { return operation(argument.Value) .ToStateful(argument.State); } } You can get a stateful version of any object by calling the ToStateful extension method, passing the state object in. You can then execute ordinary operations on the values while retaining the state: var statefulInt = 3.ToStateful("This is the state"); var processedStatefulInt = statefulInt .Execute(i => ++i) .Execute(i => i * 10) .Execute(i => i + 2); Console.WriteLine("Value: {0}; state: {1}", processedStatefulInt.Value, processedStatefulInt.State); This monad differs from the identity by enriching the boxes. There is another way to give value to the monad, which is to enrich the processing. An example of that is the writer monad, which can be typically used to log the operations that are being performed by the monad. Of course, the richest monads enrich both the boxes and the processing. That’s all for today. I hope with this you won’t have to go through the same process that I did to understand monads and that you haven’t gone into concept overload like I did. Next time, we’ll examine some examples that you already know but we will shine the monadic light, hopefully illuminating them in a whole new way. Realizing that this pattern is actually in many places but mostly unnoticed is what will enable the truly casual “oh, yes, that’s a monad” comments. Here’s the code for this article: http://weblogs.asp.net/blogs/bleroy/Samples/Monads.zip The Wikipedia article on monads: http://en.wikipedia.org/wiki/Monads_in_functional_programming This article was invaluable for me in understanding how to express the canonical monads in C# (interesting Linq stuff in there): http://blogs.msdn.com/b/wesdyer/archive/2008/01/11/the-marvels-of-monads.aspx

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• Understanding Process Scheduling in Oracle Solaris

  - by rickramsey

  The process scheduler in the Oracle Solaris kernel allocates CPU resources to processes. By default, the scheduler tries to give every process relatively equal access to the available CPUs. However, you might want to specify that certain processes be given more resources than others. That's where classes come in. A process class defines a scheduling policy for a set of processes. These three resources will help you understand and manage it process classes: Blog: Overview of Process Scheduling Classes in the Oracle Solaris Kernel by Brian Bream Timesharing, interactive, fair-share scheduler, fixed priority, system, and real time. What are these? Scheduling classes in the Solaris kernel. Brian Bream describes them and how the kernel manages them through context switching. Blog: Process Scheduling at the Thread Level by Brian Bream The Fair Share Scheduler allows you to dispatch processes not just to a particular CPU, but to CPU threads. Brian Bream explains how to use and provides examples. Docs: Overview of the Fair Share Scheduler by Oracle Solaris Documentation Team This official Oracle Solaris documentation set provides the nitty-gritty details for setting up classes and managing your processes. Covers: Introduction to the Scheduler CPU Share Definition CPU Shares and Process State CPU Share Versus Utilization CPU Share Examples FSS Configuration FSS and Processor Sets Combining FSS With Other Scheduling Classes Setting the Scheduling Class for the System Scheduling Class on a System with Zones Installed Commands Used With FSS -Rick Follow me on: Blog | Facebook | Twitter | Personal Twitter | YouTube | The Great Peruvian Novel

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• Java Slick2d - How to translate mouse coordinates to world coordinates

  - by Corey

  I am translating in my main class render. How do I get the mouse position where my mouse actually is after I scroll the screen public void render(GameContainer gc, Graphics g) throws SlickException { float centerX = 800/2; float centerY = 600/2; g.translate(centerX, centerY); g.translate(-player.playerX, -player.playerY); gen.render(g); player.render(g); } playerX = 800 /2 - sprite.getWidth(); playerY = 600 /2 - sprite.getHeight(); Image to help with explanation I tried implementing a camera but it seems no matter what I can't get the mouse position. I was told to do this worldX = mouseX + camX; but it didn't work the mouse was still off. Here is my Camera class if that helps: public class Camera { public float camX; public float camY; Player player; public void init() { player = new Player(); } public void update(GameContainer gc, int delta) { Input input = gc.getInput(); if(input.isKeyDown(Input.KEY_W)) { camY -= player.speed * delta; } if(input.isKeyDown(Input.KEY_S)) { camY += player.speed * delta; } if(input.isKeyDown(Input.KEY_A)) { camX -= player.speed * delta; } if(input.isKeyDown(Input.KEY_D)) { camX += player.speed * delta; } } Code used to convert mouse worldX = (int) (mouseX + cam.camX); worldY = (int) (mouseY + cam.camY);

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• Custom Content Pipeline with Automatic Serialization Load Error

  - by Direweasel

  I'm running into this error: Error loading "desert". Cannot find type TiledLib.MapContent, TiledLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null. at Microsoft.Xna.Framework.Content.ContentTypeReaderManager.InstantiateTypeReader(String readerTypeName, ContentReader contentReader, ContentTypeReader& reader) at Microsoft.Xna.Framework.Content.ContentTypeReaderManager.GetTypeReader(String readerTypeName, ContentReader contentReader, List1& newTypeReaders) at Microsoft.Xna.Framework.Content.ContentTypeReaderManager.ReadTypeManifest(Int32 typeCount, ContentReader contentReader) at Microsoft.Xna.Framework.Content.ContentReader.ReadHeader() at Microsoft.Xna.Framework.Content.ContentReader.ReadAsset[T]() at Microsoft.Xna.Framework.Content.ContentManager.ReadAsset[T](String assetName, Action1 recordDisposableObject) at Microsoft.Xna.Framework.Content.ContentManager.Load[T](String assetName) at TiledTest.Game1.LoadContent() in C:\My Documents\Dropbox\Visual Studio Projects\TiledTest\TiledTest\TiledTest\Game1.cs:line 51 at Microsoft.Xna.Framework.Game.Initialize() at TiledTest.Game1.Initialize() in C:\My Documents\Dropbox\Visual Studio Projects\TiledTest\TiledTest\TiledTest\Game1.cs:line 39 at Microsoft.Xna.Framework.Game.RunGame(Boolean useBlockingRun) at Microsoft.Xna.Framework.Game.Run() at TiledTest.Program.Main(String[] args) in C:\My Documents\Dropbox\Visual Studio Projects\TiledTest\TiledTest\TiledTest\Program.cs:line 15 When trying to run the game. This is a basic demo to try and utilize a separate project library called TiledLib. I have four projects overall: TiledLib (C# Class Library) TiledTest (Windows Game) TiledTestContent (Content) TMX CP Ext (Content Pipeline Extension Library) TiledLib contains MapContent which is throwing the error, however I believe this may just be a generic error with a deeper root problem. EMX CP Ext contains one file: MapProcessor.cs using System; using System.Collections.Generic; using System.Linq; using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Graphics; using Microsoft.Xna.Framework.Content.Pipeline; using Microsoft.Xna.Framework.Content.Pipeline.Graphics; using Microsoft.Xna.Framework.Content.Pipeline.Processors; using Microsoft.Xna.Framework.Content; using TiledLib; namespace TMX_CP_Ext { // Each tile has a texture, source rect, and sprite effects. [ContentSerializerRuntimeType("TiledTest.Tile, TiledTest")] public class DemoMapTileContent { public ExternalReference<Texture2DContent> Texture; public Rectangle SourceRectangle; public SpriteEffects SpriteEffects; } // For each layer, we store the size of the layer and the tiles. [ContentSerializerRuntimeType("TiledTest.Layer, TiledTest")] public class DemoMapLayerContent { public int Width; public int Height; public DemoMapTileContent[] Tiles; } // For the map itself, we just store the size, tile size, and a list of layers. [ContentSerializerRuntimeType("TiledTest.Map, TiledTest")] public class DemoMapContent { public int TileWidth; public int TileHeight; public List<DemoMapLayerContent> Layers = new List<DemoMapLayerContent>(); } [ContentProcessor(DisplayName = "TMX Processor - TiledLib")] public class MapProcessor : ContentProcessor<MapContent, DemoMapContent> { public override DemoMapContent Process(MapContent input, ContentProcessorContext context) { // build the textures TiledHelpers.BuildTileSetTextures(input, context); // generate source rectangles TiledHelpers.GenerateTileSourceRectangles(input); // now build our output, first by just copying over some data DemoMapContent output = new DemoMapContent { TileWidth = input.TileWidth, TileHeight = input.TileHeight }; // iterate all the layers of the input foreach (LayerContent layer in input.Layers) { // we only care about tile layers in our demo TileLayerContent tlc = layer as TileLayerContent; if (tlc != null) { // create the new layer DemoMapLayerContent outLayer = new DemoMapLayerContent { Width = tlc.Width, Height = tlc.Height, }; // we need to build up our tile list now outLayer.Tiles = new DemoMapTileContent[tlc.Data.Length]; for (int i = 0; i < tlc.Data.Length; i++) { // get the ID of the tile uint tileID = tlc.Data[i]; // use that to get the actual index as well as the SpriteEffects int tileIndex; SpriteEffects spriteEffects; TiledHelpers.DecodeTileID(tileID, out tileIndex, out spriteEffects); // figure out which tile set has this tile index in it and grab // the texture reference and source rectangle. ExternalReference<Texture2DContent> textureContent = null; Rectangle sourceRect = new Rectangle(); // iterate all the tile sets foreach (var tileSet in input.TileSets) { // if our tile index is in this set if (tileIndex - tileSet.FirstId < tileSet.Tiles.Count) { // store the texture content and source rectangle textureContent = tileSet.Texture; sourceRect = tileSet.Tiles[(int)(tileIndex - tileSet.FirstId)].Source; // and break out of the foreach loop break; } } // now insert the tile into our output outLayer.Tiles[i] = new DemoMapTileContent { Texture = textureContent, SourceRectangle = sourceRect, SpriteEffects = spriteEffects }; } // add the layer to our output output.Layers.Add(outLayer); } } // return the output object. because we have ContentSerializerRuntimeType attributes on our // objects, we don't need a ContentTypeWriter and can just use the automatic serialization. return output; } } } TiledLib contains a large amount of files including MapContent.cs using System; using System.Collections.Generic; using System.Globalization; using System.Xml; using Microsoft.Xna.Framework.Content.Pipeline; namespace TiledLib { public enum Orientation : byte { Orthogonal, Isometric, } public class MapContent { public string Filename; public string Directory; public string Version = string.Empty; public Orientation Orientation; public int Width; public int Height; public int TileWidth; public int TileHeight; public PropertyCollection Properties = new PropertyCollection(); public List<TileSetContent> TileSets = new List<TileSetContent>(); public List<LayerContent> Layers = new List<LayerContent>(); public MapContent(XmlDocument document, ContentImporterContext context) { XmlNode mapNode = document["map"]; Version = mapNode.Attributes["version"].Value; Orientation = (Orientation)Enum.Parse(typeof(Orientation), mapNode.Attributes["orientation"].Value, true); Width = int.Parse(mapNode.Attributes["width"].Value, CultureInfo.InvariantCulture); Height = int.Parse(mapNode.Attributes["height"].Value, CultureInfo.InvariantCulture); TileWidth = int.Parse(mapNode.Attributes["tilewidth"].Value, CultureInfo.InvariantCulture); TileHeight = int.Parse(mapNode.Attributes["tileheight"].Value, CultureInfo.InvariantCulture); XmlNode propertiesNode = document.SelectSingleNode("map/properties"); if (propertiesNode != null) { Properties = new PropertyCollection(propertiesNode, context); } foreach (XmlNode tileSet in document.SelectNodes("map/tileset")) { if (tileSet.Attributes["source"] != null) { TileSets.Add(new ExternalTileSetContent(tileSet, context)); } else { TileSets.Add(new TileSetContent(tileSet, context)); } } foreach (XmlNode layerNode in document.SelectNodes("map/layer|map/objectgroup")) { LayerContent layerContent; if (layerNode.Name == "layer") { layerContent = new TileLayerContent(layerNode, context); } else if (layerNode.Name == "objectgroup") { layerContent = new MapObjectLayerContent(layerNode, context); } else { throw new Exception("Unknown layer name: " + layerNode.Name); } // Layer names need to be unique for our lookup system, but Tiled // doesn't require unique names. string layerName = layerContent.Name; int duplicateCount = 2; // if a layer already has the same name... if (Layers.Find(l => l.Name == layerName) != null) { // figure out a layer name that does work do { layerName = string.Format("{0}{1}", layerContent.Name, duplicateCount); duplicateCount++; } while (Layers.Find(l => l.Name == layerName) != null); // log a warning for the user to see context.Logger.LogWarning(string.Empty, new ContentIdentity(), "Renaming layer \"{1}\" to \"{2}\" to make a unique name.", layerContent.Type, layerContent.Name, layerName); // save that name layerContent.Name = layerName; } Layers.Add(layerContent); } } } } I'm lost as to why this is failing. Thoughts? -- EDIT -- After playing with it a bit, I would think it has something to do with referencing the projects. I'm already referencing the TiledLib within my main windows project (TiledTest). However, this doesn't seem to make a difference. I can place the dll generated from the TiledLib project into the debug folder of TiledTest, and this causes it to generate a different error: Error loading "desert". Cannot find ContentTypeReader for Microsoft.Xna.Framework.Content.Pipeline.ExternalReference`1[Microsoft.Xna.Framework.Content.Pipeline.Graphics.Texture2DContent]. at Microsoft.Xna.Framework.Content.ContentTypeReaderManager.GetTypeReader(Type targetType, ContentReader contentReader) at Microsoft.Xna.Framework.Content.ContentTypeReaderManager.GetTypeReader(Type targetType) at Microsoft.Xna.Framework.Content.ReflectiveReaderMemberHelper..ctor(ContentTypeReaderManager manager, FieldInfo fieldInfo, PropertyInfo propertyInfo, Type memberType, Boolean canWrite) at Microsoft.Xna.Framework.Content.ReflectiveReaderMemberHelper.TryCreate(ContentTypeReaderManager manager, Type declaringType, FieldInfo fieldInfo) at Microsoft.Xna.Framework.Content.ReflectiveReader1.Initialize(ContentTypeReaderManager manager) at Microsoft.Xna.Framework.Content.ContentTypeReaderManager.ReadTypeManifest(Int32 typeCount, ContentReader contentReader) at Microsoft.Xna.Framework.Content.ContentReader.ReadHeader() at Microsoft.Xna.Framework.Content.ContentReader.ReadAsset[T]() at Microsoft.Xna.Framework.Content.ContentManager.ReadAsset[T](String assetName, Action1 recordDisposableObject) at Microsoft.Xna.Framework.Content.ContentManager.Load[T](String assetName) at TiledTest.Game1.LoadContent() in C:\My Documents\Dropbox\Visual Studio Projects\TiledTest\TiledTest\TiledTest\Game1.cs:line 51 at Microsoft.Xna.Framework.Game.Initialize() at TiledTest.Game1.Initialize() in C:\My Documents\Dropbox\Visual Studio Projects\TiledTest\TiledTest\TiledTest\Game1.cs:line 39 at Microsoft.Xna.Framework.Game.RunGame(Boolean useBlockingRun) at Microsoft.Xna.Framework.Game.Run() at TiledTest.Program.Main(String[] args) in C:\My Documents\Dropbox\Visual Studio Projects\TiledTest\TiledTest\TiledTest\Program.cs:line 15 This is all incredibly frustrating as the demo doesn't appear to have any special linking properties. The TiledLib I am utilizing is from Nick Gravelyn, and can be found here: https://bitbucket.org/nickgravelyn/tiledlib. The demo it comes with works fine, and yet in recreating I always run into this error.

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• resolv.conf doesn't get set on reboot when networking is configured for static ip

  - by kenneth koontz

  I'm experiencing, what appears to be a hostname resolution issue in ubuntu 12.04 server edition when configuring my computer to use a static ip. In /etc/network/interfaces: # The primary network interface auto eth0 iface eth0 inet static address 192.168.1.28 netmask 255.255.255.0 gateway 192.168.1.1 Running $ sudo apt-get upgrade, results in a 'Failed to fetch...': . . . W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-backports/universe/i18n/Translation-en_US Something wicked happened resolving 'us.archive.ubuntu.com:http' (-5 - No address associated with hostname) W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-backports/universe/i18n/Translation-en Something wicked happened resolving 'us.archive.ubuntu.com:http' (-5 - No address associated with hostname) E: Some index files failed to download. They have been ignored, or old ones used instead. When I change my /etc/network/interfaces to: auto eth0 iface eth0 inet dhcp Everything works fine. Looking into /etc/resolv.conf provides some more hints...In cases where I was getting the resolving issue, resolve.conf was empty. No nameservers were specified. When I changed to dhcp from static and restarted networking. /etc/resolv.conf gets written to: 'nameserver 192.168.1.1'. Switching back from dhcp to static and restarting doesn't remove the nameserve entry. When I restart the system with static set, resolv.conf is empty. When I restart the system with dhcp set, resolv.conf has nameserver 192.168.1.1. So it appears that the issue is that resolve.conf is not getting written to correctly? Which package/code is responsible for writing to resolv.conf? Is there a particular package that I can take a look at open issues? UPDATE: istream posted a good article discussing changes to resolve.conf in 12.04. http://www.stgraber.org/2012/02/24/dns-in-ubuntu-12-04/

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• Entity System with C++

  - by Dono

  I'm working on a game engine using the Entity System and I have some questions. How I see Entity System : Components : A class with attributs, set and get. Sprite Physicbody SpaceShip ... System : A class with a list of components. (Component logic) EntityManager Renderer Input Camera ... Entity : Just a empty class with a list of components. What I've done : Currently, I've got a program who allow me to do that : // Create a new entity/ Entity* entity = game.createEntity(); // Add some components. entity->addComponent( new TransformableComponent() ) ->setPosition( 15, 50 ) ->setRotation( 90 ) ->addComponent( new PhysicComponent() ) ->setMass( 70 ) ->addComponent( new SpriteComponent() ) ->setTexture( "name.png" ) ->addToSystem( new RendererSystem() ); My questions Did the system stock a list of components or a list of entities ? In the case where I stock a list of entities, I need to get the component of this entities on each frame, that's probably heavy isn't it ? Did the system stock a list of components or a list of entities ? In the case where I stock a list of entities, I need to get the component of this entities on each frame, that's probably heavy isn't it ?

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• Design pattern for procedural terrain assets

  - by Alex

  I'm developing a procedural terrain class at the moment and am stuck on the correct design pattern. The terrain is 2D and is constructed from a series of (x,y) points. I currently have a method that just randomly adds points to an array of points to generate a random spread of points. However I need a more elaborate system for generating the terrain. The terrain will be built form a series of re-accuring terrain structures eg. a pit, jump, hill etc. Each structure will have some randomness assigned to it, each height of hill will be random, pit size will be random etc. Each terrain structure will have: A property detailing the number of points making up that structure A method for generating the points (not absolutely necessary) My current thinking is to have a class for each terrain structure, create a fixed amount of terrain elements ahead of the player, loop over these and add the corresponding points to the game. What is the best way to create these procedural terrain structures when they are ultimately just a set of functions for generating terrain elements? Is a class for each terrain element excessive? I'm developing the game for iphone so any objective-c related answers would be welcome.

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• The dreaded Brightness issue (Fn keys + Max brightness)

  - by Adam

  I'm trying to get some control over the brightness of my Samsung QX411 (Integrated Intel and discrete Nvidia, though Ubuntu doesn't see the latter yet, I'll play around with Bumblebee later) Using the FN+up/down lowers the screen brightness from max to one peg down or back up. If I try to bring the brightness down any more, it just flickers and stays the same. I can lower the brightness in Settings, but that's delicate and gets reverted to max if I open up the brightness settings again, or log out. The closest I got was adding acpi_backlight=vendor to a line in /etc/default/grub, (source) I could consequently lower the brightness a couple of pegs down to the minimum with FN+down, but then it's as if the problem got inversed, and I'd get stuck in the bottom tier, I could only increase the brightness by one peg and back down. Rebooting would revert to max brightness. acpi_osi=, acpi_osi=Linux, acpi_osi=vendor, acpi_osi='!Windows 2012', acpi_backlight=Linux, acpi_backlight='!Windows 2012' don't do anything for me. I've also tried adding echo 2000 > /sys/class/backlight/intel_backlight/brightness to /etc/rc.local, where my max value from cat /sys/class/backlight/intel_backlight/brightness is 4648, which didn't do anything. (same result with echo 2000 > /sys/class/backlight/acpi_video0/brightness) source Samsung tools also didn't help in this regard. I've spent hours on this, it's getting quite frustrating. Any help would be greatly appreciated.

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• Due to the Classes

  - by Ratman21

  Why does it seem that I am always saying sorry (or in Japanese Gomennasi)?  Well I am late again for blog as you can see. The CCNA class’s part 1 (also known as CCENT) was, well more intense than all of the certification classes before it.   The teacher was cramming as much as he could into us during the week and it was hard to come home and do much more than fall into bed (Well I was doing still doing my Job search and checking up on my web sites and groups).   But I didn’t have much left in the way of blogging (Which by the way is now in 3 different sites). Even though it was hard some times, I really liked the fact I was getting back to something like (and mean really like, in fact I like Cisco routers than some people I know). At the class, I got some software that allows me to simulate setting up and troubles shoot Lan’s or Wan’s.   When we weren’t getting facts for the test thrown at us, we were doing labs with this software. It was fun for me to be able to use the CISCO router commands and trouble shoot router issues. Even if it was just a sim. So now it is study, study, take practices tests and do the labs. I took the week end and more off after cram CCENT week but, now I am back at it.  Also I could not keep up with my Love Dare book during week of the class. No I did not stop or forget what I already learned. I just put the next dare on hold. Well the hold is off starting tomorrow and tonight I think I am going to write a new cover letter. Let’s see what else I can get done tonight. Hmm I think I will try to do a sim of my home wireless LAN and study for CCENT test in about 3 weeks.   So see you tomorrow (I hope).

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• Metro: Dynamically Switching Templates with a WinJS ListView

  - by Stephen.Walther

  Imagine that you want to display a list of products using the WinJS ListView control. Imagine, furthermore, that you want to use different templates to display different products. In particular, when a product is on sale, you want to display the product using a special “On Sale” template. In this blog entry, I explain how you can switch templates dynamically when displaying items with a ListView control. In other words, you learn how to use more than one template when displaying items with a ListView control. Creating the Data Source Let’s start by creating the data source for the ListView. Nothing special here – our data source is a list of products. Two of the products, Oranges and Apples, are on sale. (function () { "use strict"; var products = new WinJS.Binding.List([ { name: "Milk", price: 2.44 }, { name: "Oranges", price: 1.99, onSale: true }, { name: "Wine", price: 8.55 }, { name: "Apples", price: 2.44, onSale: true }, { name: "Steak", price: 1.99 }, { name: "Eggs", price: 2.44 }, { name: "Mushrooms", price: 1.99 }, { name: "Yogurt", price: 2.44 }, { name: "Soup", price: 1.99 }, { name: "Cereal", price: 2.44 }, { name: "Pepsi", price: 1.99 } ]); WinJS.Namespace.define("ListViewDemos", { products: products }); })(); The file above is saved with the name products.js and referenced by the default.html page described below. Declaring the Templates and ListView Control Next, we need to declare the ListView control and the two Template controls which we will use to display template items. The markup below appears in the default.html file: <!-- Templates --> <div id="productItemTemplate" data-win-control="WinJS.Binding.Template"> <div class="product"> <span data-win-bind="innerText:name"></span> <span data-win-bind="innerText:price"></span> </div> </div> <div id="productOnSaleTemplate" data-win-control="WinJS.Binding.Template"> <div class="product onSale"> <span data-win-bind="innerText:name"></span> <span data-win-bind="innerText:price"></span> (On Sale!) </div> </div> <!-- ListView --> <div id="productsListView" data-win-control="WinJS.UI.ListView" data-win-options="{ itemDataSource: ListViewDemos.products.dataSource, layout: { type: WinJS.UI.ListLayout } }"> </div> In the markup above, two Template controls are declared. The first template is used when rendering a normal product and the second template is used when rendering a product which is on sale. The second template, unlike the first template, includes the text “(On Sale!)”. The ListView control is bound to the data source which we created in the previous section. The ListView itemDataSource property is set to the value ListViewDemos.products.dataSource. Notice that we do not set the ListView itemTemplate property. We set this property in the default.js file. Switching Between Templates All of the magic happens in the default.js file. The default.js file contains the JavaScript code used to switch templates dynamically. Here’s the entire contents of the default.js file: (function () { "use strict"; var app = WinJS.Application; app.onactivated = function (eventObject) { if (eventObject.detail.kind === Windows.ApplicationModel.Activation.ActivationKind.launch) { WinJS.UI.processAll().then(function () { var productsListView = document.getElementById("productsListView"); productsListView.winControl.itemTemplate = itemTemplateFunction; });; } }; function itemTemplateFunction(itemPromise) { return itemPromise.then(function (item) { // Select either normal product template or on sale template var itemTemplate = document.getElementById("productItemTemplate"); if (item.data.onSale) { itemTemplate = document.getElementById("productOnSaleTemplate"); }; // Render selected template to DIV container var container = document.createElement("div"); itemTemplate.winControl.render(item.data, container); return container; }); } app.start(); })(); In the code above, a function is assigned to the ListView itemTemplate property with the following line of code: productsListView.winControl.itemTemplate = itemTemplateFunction;   The itemTemplateFunction returns a DOM element which is used for the template item. Depending on the value of the product onSale property, the DOM element is generated from either the productItemTemplate or the productOnSaleTemplate template. Using Binding Converters instead of Multiple Templates In the previous sections, I explained how you can use different templates to render normal products and on sale products. There is an alternative approach to displaying different markup for normal products and on sale products. Instead of creating two templates, you can create a single template which contains separate DIV elements for a normal product and an on sale product. The following default.html file contains a single item template and a ListView control bound to the template. <!-- Template --> <div id="productItemTemplate" data-win-control="WinJS.Binding.Template"> <div class="product" data-win-bind="style.display: onSale ListViewDemos.displayNormalProduct"> <span data-win-bind="innerText:name"></span> <span data-win-bind="innerText:price"></span> </div> <div class="product onSale" data-win-bind="style.display: onSale ListViewDemos.displayOnSaleProduct"> <span data-win-bind="innerText:name"></span> <span data-win-bind="innerText:price"></span> (On Sale!) </div> </div> <!-- ListView --> <div id="productsListView" data-win-control="WinJS.UI.ListView" data-win-options="{ itemDataSource: ListViewDemos.products.dataSource, itemTemplate: select('#productItemTemplate'), layout: { type: WinJS.UI.ListLayout } }"> </div> The first DIV element is used to render a normal product: <div class="product" data-win-bind="style.display: onSale ListViewDemos.displayNormalProduct"> <span data-win-bind="innerText:name"></span> <span data-win-bind="innerText:price"></span> </div> The second DIV element is used to render an “on sale” product: <div class="product onSale" data-win-bind="style.display: onSale ListViewDemos.displayOnSaleProduct"> <span data-win-bind="innerText:name"></span> <span data-win-bind="innerText:price"></span> (On Sale!) </div> Notice that both templates include a data-win-bind attribute. These data-win-bind attributes are used to show the “normal” template when a product is not on sale and show the “on sale” template when a product is on sale. These attributes set the Cascading Style Sheet display attribute to either “none” or “block”. The data-win-bind attributes take advantage of binding converters. The binding converters are defined in the default.js file: (function () { "use strict"; var app = WinJS.Application; app.onactivated = function (eventObject) { if (eventObject.detail.kind === Windows.ApplicationModel.Activation.ActivationKind.launch) { WinJS.UI.processAll(); } }; WinJS.Namespace.define("ListViewDemos", { displayNormalProduct: WinJS.Binding.converter(function (onSale) { return onSale ? "none" : "block"; }), displayOnSaleProduct: WinJS.Binding.converter(function (onSale) { return onSale ? "block" : "none"; }) }); app.start(); })(); The ListViewDemos.displayNormalProduct binding converter converts the value true or false to the value “none” or “block”. The ListViewDemos.displayOnSaleProduct binding converter does the opposite; it converts the value true or false to the value “block” or “none” (Sadly, you cannot simply place a NOT operator before the onSale property in the binding expression – you need to create both converters). The end result is that you can display different markup depending on the value of the product onSale property. Either the contents of the first or second DIV element are displayed: Summary In this blog entry, I’ve explored two approaches to displaying different markup in a ListView depending on the value of a data item property. The bulk of this blog entry was devoted to explaining how you can assign a function to the ListView itemTemplate property which returns different templates. We created both a productItemTemplate and productOnSaleTemplate and displayed both templates with the same ListView control. We also discussed how you can create a single template and display different markup by using binding converters. The binding converters are used to set a DIV element’s display property to either “none” or “block”. We created a binding converter which displays normal products and a binding converter which displays “on sale” products.

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• WSDL-world vs CLR-world – some differences

  - by nmarun

  A change in mindset is required when switching between a typical CLR application and a web service application. There are some things in a CLR environment that just don’t add-up in a WSDL arena (and vice-versa). I’m listing some of them here. When I say WSDL-world, I’m mostly talking with respect to a WCF Service and / or a Web Service. No (direct) Method Overloading: You definitely can have overloaded methods in a, say, Console application, but when it comes to a WCF / Web Services application, you need to adorn these overloaded methods with a special attribute so the service knows which specific method to invoke. When you’re working with WCF, use the Name property of the OperationContract attribute to provide unique names. 1: [OperationContract(Name = "AddInt")] 2: int Add(int arg1, int arg2); 3:  4: [OperationContract(Name = "AddDouble")] 5: double Add(double arg1, double arg2); By default, the proxy generates the code for this as: 1: [System.ServiceModel.OperationContractAttribute( 2: Action="http://tempuri.org/ILearnWcfService/AddInt", 3: ReplyAction="http://tempuri.org/ILearnWcfService/AddIntResponse")] 4: int AddInt(int arg1, int arg2); 5: 6: [System.ServiceModel.OperationContractAttribute( 7: Action="http://tempuri.org/ILearnWcfServiceExtend/AddDouble", 8: ReplyAction="http://tempuri.org/ILearnWcfServiceExtend/AddDoubleResponse")] 9: double AddDouble(double arg1, double arg2); With Web Services though the story is slightly different. Even after setting the MessageName property of the WebMethod attribute, the proxy does not change the name of the method, but only the underlying soap message changes. 1: [WebMethod] 2: public string HelloGalaxy() 3: { 4: return "Hello Milky Way!"; 5: } 6:  7: [WebMethod(MessageName = "HelloAnyGalaxy")] 8: public string HelloGalaxy(string galaxyName) 9: { 10: return string.Format("Hello {0}!", galaxyName); 11: } The one thing you need to remember is to set the WebServiceBinding accordingly. 1: [WebServiceBinding(ConformsTo = WsiProfiles.None)] The proxy is: 1: [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/HelloGalaxy", 2: RequestNamespace="http://tempuri.org/", 3: ResponseNamespace="http://tempuri.org/", 4: Use=System.Web.Services.Description.SoapBindingUse.Literal, 5: ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)] 6: public string HelloGalaxy() 7:  8: [System.Web.Services.WebMethodAttribute(MessageName="HelloGalaxy1")] 9: [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/HelloAnyGalaxy", 10: RequestElementName="HelloAnyGalaxy", 11: RequestNamespace="http://tempuri.org/", 12: ResponseElementName="HelloAnyGalaxyResponse", 13: ResponseNamespace="http://tempuri.org/", 14: Use=System.Web.Services.Description.SoapBindingUse.Literal, 15: ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)] 16: [return: System.Xml.Serialization.XmlElementAttribute("HelloAnyGalaxyResult")] 17: public string HelloGalaxy(string galaxyName) 18:  You see the calling method name is the same in the proxy, however the soap message that gets generated is different. Using interchangeable data types: See details on this here. Type visibility: In a CLR-based application, if you mark a field as private, well we all know, it’s ‘private’. Coming to a WSDL side of things, in a Web Service, private fields and web methods will not get generated in the proxy. In WCF however, all your operation contracts will be public as they get implemented from an interface. Even in case your ServiceContract interface is declared internal/private, you will see it as a public interface in the proxy. This is because type visibility is a CLR concept and has no bearing on WCF. Also if a private field has the [DataMember] attribute in a data contract, it will get emitted in the proxy class as a public property for the very same reason. 1: [DataContract] 2: public struct Person 3: { 4: [DataMember] 5: private int _x; 6:  7: [DataMember] 8: public int Id { get; set; } 9:  10: [DataMember] 11: public string FirstName { get; set; } 12:  13: [DataMember] 14: public string Header { get; set; } 15: } 16: } See the ‘_x’ field is a private member with the [DataMember] attribute, but the proxy class shows as below: 1: [System.Runtime.Serialization.DataMemberAttribute()] 2: public int _x { 3: get { 4: return this._xField; 5: } 6: set { 7: if ((this._xField.Equals(value) != true)) { 8: this._xField = value; 9: this.RaisePropertyChanged("_x"); 10: } 11: } 12: } Passing derived types to web methods / operation contracts: Once again, in a CLR application, I can have a derived class be passed as a parameter where a base class is expected. I have the following set up for my WCF service. 1: [DataContract] 2: public class Employee 3: { 4: [DataMember(Name = "Id")] 5: public int EmployeeId { get; set; } 6:  7: [DataMember(Name="FirstName")] 8: public string FName { get; set; } 9:  10: [DataMember] 11: public string Header { get; set; } 12: } 13:  14: [DataContract] 15: public class Manager : Employee 16: { 17: [DataMember] 18: private int _x; 19: } 20:  21: // service contract 22: [OperationContract] 23: Manager SaveManager(Employee employee); 24:  25: // in my calling code 26: Manager manager = new Manager {_x = 1, FirstName = "abc"}; 27: manager = LearnWcfServiceClient.SaveManager(manager); The above will throw an exception saying: In short, this is saying, that a Manager type was found where an Employee type was expected! Hierarchy flattening of interfaces in WCF: See details on this here. In CLR world, you’ll see the entire hierarchy as is. That’s another difference. Using ref parameters: * can use ref for parameters, but operation contract should not be one-way (gives an error when you do an update service reference)   => bad programming; create a return object that is composed of everything you need! This one kind of stumped me. Not sure why I tried this, but you can pass parameters prefixed with ref keyword* (* terms and conditions apply). The main issue is this, how would we know the changes that were made to a ‘ref’ input parameter are returned back from the service and updated to the local variable? Turns out both Web Services and WCF make this tracking happen by passing the input parameter in the response soap. This way when the deserializer does its magic, it maps all the elements of the response xml thereby updating our local variable. Here’s what I’m talking about. 1: [WebMethod(MessageName = "HelloAnyGalaxy")] 2: public string HelloGalaxy(ref string galaxyName) 3: { 4: string output = string.Format("Hello {0}", galaxyName); 5: if (galaxyName == "Andromeda") 6: { 7: galaxyName = string.Format("{0} (2.5 million light-years away)", galaxyName); 8: } 9: return output; 10: } This is how the request and response look like in soapUI. As I said above, the behavior is quite similar for WCF as well. But the catch comes when you have a one-way web methods / operation contracts. If you have an operation contract whose return type is void, is marked one-way and that has ref parameters then you’ll get an error message when you try to reference such a service. 1: [OperationContract(Name = "Sum", IsOneWay = true)] 2: void Sum(ref double arg1, ref double arg2); 3:  4: public void Sum(ref double arg1, ref double arg2) 5: { 6: arg1 += arg2; 7: } This is what I got when I did an update to my service reference: Makes sense, because a OneWay operation is… one-way – there’s no returning from this operation. You can also have a one-way web method: 1: [SoapDocumentMethod(OneWay = true)] 2: [WebMethod(MessageName = "HelloAnyGalaxy")] 3: public void HelloGalaxy(ref string galaxyName) This will throw an exception message similar to the one above when you try to update your web service reference. In the CLR space, there’s no such concept of a ‘one-way’ street! Yes, there’s void, but you very well can have ref parameters returned through such a method. Just a point here; although the ref/out concept sounds cool, it’s generally is a code-smell. The better approach is to always return an object that is composed of everything you need returned from a method. These are some of the differences that we need to bear when dealing with services that are different from our daily ‘CLR’ life.

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• Evil DRY

  - by StefanSteinegger

  DRY (Don't Repeat Yourself) is a basic software design and coding principle. But there is just no silver bullet. While DRY should increase maintainability by avoiding common design mistakes, it could lead to huge maintenance problems when misunderstood. The root of the problem is most probably that many developers believe that DRY means that any piece of code that is written more then once should be made reusable. But the principle is stated as "Every piece of knowledge must have a single, unambiguous, authoritative representation within a system." So the important thing here is "knowledge". Nobody ever said "every piece of code". I try to give some examples of misusing the DRY principle. Code Repetitions by Coincidence There is code that is repeated by pure coincidence. It is not the same code because it is based on the same piece of knowledge, it is just the same by coincidence. It's hard to give an example of such a case. Just think about some lines of code the developer thinks "I already wrote something similar". Then he takes the original code, puts it into a public method, even worse into a base class where none had been there before, puts some weird arguments and some if or switch statements into it to support all special cases and calls this "increasing maintainability based on the DRY principle". The resulting "reusable method" is usually something the developer not even can give a meaningful name, because its contents isn't anything specific, it is just a bunch of code. For the same reason, nobody will really understand this piece of code. Typically this method only makes sense to call after some other method had been called. All the symptoms of really bad design is evident. Fact is, writing this kind of "reusable methods" is worse then copy pasting! Believe me. What will happen when you change this weird piece of code? You can't say what'll happen, because you can't understand what the code is actually doing. So better don't touch it anymore. Maintainability just died. Of course this problem is with any badly designed code. But because the developer tried to make this method as reusable as possible, large parts of the system get dependent on it. Completely independent parts get tightly coupled by this common piece of code. Changing on the single common place will have effects anywhere in the system, a typical symptom of too tight coupling. Without trying to dogmatically (and wrongly) apply the DRY principle, you just had a system with a weak design. Now you get a system which just can't be maintained anymore. So what can you do against it? When making code reusable, always identify the generally reusable parts of it. Find the reason why the code is repeated, find the common "piece of knowledge". If you have to search too far, it's probably not really there. Explain it to a colleague, if you can't explain or the explanation is to complicated, it's probably not worth to reuse. If you identify the piece of knowledge, don't forget to carefully find the place where it should be implemented. Reusing code is never worth giving up a clean design. Methods always need to do something specific. If you can't give it a simple and explanatory name, you did probably something weird. If you can't find the common piece of knowledge, try to make the code simpler. For instance, if you have some complicated string or collection operations within this code, write some general-purpose operations into a helper class. If your code gets simple enough, its not so bad if it can't be reused. If you are not able to find anything simple and reasonable, copy paste it. Put a comment into the code to reference the other copies. You may find a solution later. Requirements Repetitions by Coincidence Let's assume that you need to implement complex tax calculations for many countries. It's possible that some countries have very similar tax rules. These rules are still completely independent from each other, since every country can change it of its own. (Assumed that this similarity is actually by coincidence and not by political membership. There might be basic rules applying to all European countries. etc.) Let's assume that there are similarities between an Asian country and an African country. Moving the common part to a central place will cause problems. What happens if one of the countries changes its rules? Or - more likely - what happens if users of one country complain about an error in the calculation? If there is shared code, it is very risky to change it, even for a bugfix. It is hard to find requirements to be repeated by coincidence. Then there is not much you can do against the repetition of the code. What you really should consider is to make coding of the rules as simple as possible. So this independent knowledge "Tax Rules in Timbuktu" or wherever should be as pure as possible, without much overhead and stuff that does not belong to it. So you can write every independent requirement short and clean. DRYing try-catch and using Blocks This is a technical issue. Blocks like try-catch or using (e.g. in C#) are very hard to DRY. Imagine a complex exception handling, including several catch blocks. When the contents of the try block as well as the contents of the individual catch block are trivial, but the whole structure is repeated on many places in the code, there is almost no reasonable way to DRY it. try { // trivial code here using (Thingy thing = new thingy) { //trivial, but always different line of code } } catch(FooException foo) { // trivial foo handling } catch (BarException bar) { // trivial bar handling } catch { // trivial common handling } finally { // trivial finally block } The key here is that every block is trivial, so there is nothing to just move into a separate method. The only part that differs from case to case is the line of code in the body of the using block (or any other block). The situation is especially interesting if the many occurrences of this structure are completely independent: they appear in classes with no common base class, they don't aggregate each other and so on. Let's assume that this is a common pattern in service methods within the whole system. Examples of Evil DRYing in this situation: Put a if or switch statement into the method to choose the line of code to execute. There are several reasons why this is not a good idea: The close coupling of the formerly independent implementation is the strongest. Also the readability of the code and the use of a parameter to control the logic. Put everything into a method which takes a delegate as argument to call. The caller just passes his "specific line of code" to this method. The code will be very unreadable. The same maintainability problems apply as for any "Code Repetition by Coincidence" situations. Enforce a base class to all the classes where this pattern appears and use the template method pattern. It's the same readability and maintainability problem as above, but additionally complex and tightly coupled because of the base class. I would call this "Inheritance by Coincidence" which will not lead to great software design. What can you do against it: Ideally, the individual line of code is a call to a class or interface, which could be made individual by inheritance. If this would be the case, it wouldn't be a problem at all. I assume that it is no such a trivial case. Consider to refactor the error concept to make error handling easier. The last but not worst option is to keep the replications. Some pattern of code must be maintained in consistency, there is nothing we can do against it. And no reason to make it unreadable. Conclusion The DRY-principle is an important and basic principle every software developer should master. The key is to identify the "pieces of knowledge". There is code which can't be reused easily because of technical reasons. This requires quite a bit flexibility and creativity to make code simple and maintainable. It's not the problem of the principle, it is the problem of blindly applying a principle without understanding the problem it should solve. The result is mostly much worse then ignoring the principle.

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• Ruby on Rails - Belongs_to and Active Admin not creating foreign ID

  - by Milo

  I have the following setup: class Category < ActiveRecord::Base has_many :products end class Product < ActiveRecord::Base belongs_to :category has_attached_file :photo, :styles => { :medium => "300x300>", :thumb => "200x200>" } validates_attachment_content_type :photo, :content_type => /\Aimage\/.*\Z/ end ActiveAdmin.register Product do permit_params :title, :price, :slideshow, :photo, :category form do |f| f.inputs "Product Details" do f.input :title f.input :category f.input :price f.input :slideshow f.input :photo, :required => false, :as => :file end f.actions end show do |ad| attributes_table do row :title row :category row :photo do image_tag(ad.photo.url(:medium)) end end end index do column :id column :title column :category column :price do |product| number_to_currency product.price end actions end class ProductController < ApplicationController def create @product = Product.create(params[:id]) end end Every time I make a product item in activeadmin the category comes up empty. It wont populate the column category_id for the product. It just leaves it empty. What am I doing wrong?

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• Operation MVC

  - by Ken Lovely, MCSE, MCDBA, MCTS

  It was time to create a new site. I figured VS 2010 is out so I should write it using MVC and Entity Framework. I have been very happy with MVC. My boss has had me making an administration web site in MVC2 but using 2008. I think one of the greatest features of MVC is you get to work with root of the app. It is kind of like being an iron worker; you get to work with the metal, mold it from scratch. Getting my articles out of my database and onto web pages was by far easier with MVC than it was with regular ASP.NET. This code is what I use to post the article to that page. It's pretty straightforward. The link in the menu is passes the id which is simply the url to the page. It looks for that url in the database and returns the rest of the article.   DataResults dr = new DataResults(); string title = string.Empty; string article = string.Empty; foreach (var D in dr.ReturnArticle(ViewData["PageName"].ToString())) { title = D.Title; article = D.Article; } public   List<CurrentArticle> ReturnArticle(string id) { var resultlist = new List<CurrentArticle>(); DBDataContext context = new DBDataContext(); var results = from D in context.MyContents where D.MVCURL.Contains(id) select D;foreach (var result in results) { CurrentArticle ca = new CurrentArticle(); ca.Title = result.Title; ca.Article = result.Article; ca.Summary = result.Summary; resultlist.Add(ca); } return resultlist;}

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• CodePlex Daily Summary for Monday, December 17, 2012

  CodePlex Daily Summary for Monday, December 17, 2012Popular ReleasesMove Mouse: Move Mouse 2.5.3: FIXED - Issue where it errors on load if the screen saver interval is over 333 minutes.LINUX????????: LINUX????????: LINUX????????cnbeta: cnbeta: cnbetaCSDN ??: CSDN??????: CSDN??????PowerShell Community Extensions: 2.1.1 Production: PowerShell Community Extensions 2.1.1 Release NotesDec 16, 2012 This version of PSCX supports both Windows PowerShell 2.0 and 3.0. Bug fix for HelpUri error with the Get-Help proxy command. See the ReleaseNotes.txt download above for more information.CRM 2011 Navigation UI Record Counter: Navigation UI Record Counter v1.3.1: Fixes Bug with Chrome Bug with parseXml - reverted to good old indexOfVidCoder: 1.4.11 Beta: Added Hungarian translation, thanks to Brechler Zsolt. Update HandBrake core to SVN 5098. This update should fix crashes on some files. Updated the enqueue split button to fit in better with the active Windows theme. Updated presets to use x264 preset/profile/level.???: Cnblogs: CNBLOGSSandcastle Help File Builder: SHFB v1.9.6.0 with Visual Studio Package: General InformationIMPORTANT: On some systems, the content of the ZIP file is blocked and the installer may fail to run. Before extracting it, right click on the ZIP file, select Properties, and click on the Unblock button if it is present in the lower right corner of the General tab in the properties dialog. This new release contains bug fixes and feature enhancements. There are some potential breaking changes in this release as some features of the Help File Builder have been moved into...Electricity, Gas and Temperature Monitoring with Netduino Plus: V1.0.1 Netduino Plus Monitoring: This is the first stable release from the Netduino Plus Monitoring program. Bugfixing The code is enhanced at some places in respect to the V0.6.1 version There is a possibility to add multiple S0 meters Website for realtime display of data Website for configuring the Netduino Comments are welcome! Additions will not be made to this version. This is the first and last major Netduino Plus V1 release. The new development will take place with the Netduino Plus V2 development board in mi...CRM 2011 Visual Ribbon Editor: Visual Ribbon Editor (1.3.1116.8): [FIX] Fixed issue not displaying CRM system button images correctly (incorrect path in file VisualRibbonEditor.exe.config)My Expenses Windows Store LOB App Demo: My Expenses Version 1: This is version 1 of the MyExpenses Windows 8 line of business demo app. The app is written in XAML and C#. It calls a WCF service that works with a SQL Server database. The app uses the Callisto toolkit. You can get it at https://github.com/timheuer/callisto. The Expenses.sql file contains the SQL to create the Expenses database. The ExpensesWCFService.zip file contains the WCF service, also written in C#. You should create a WCF service. Create an Entity Framework model and point it to...BlackJumboDog: Ver5.7.4: 2012.12.13 Ver5.7.4 (1)Web???????、???????????????????????????????????????????VFPX: ssClasses A1.0: My initial release. See https://vfpx.codeplex.com/wikipage?title=ssClasses&referringTitle=Home for a brief description of what is inside this releaseLayered Architecture Solution Guidance (LASG): LASG 1.0.0.8 for Visual Studio 2012: PRE-REQUISITES Open GAX (Please install Oct 4, 2012 version) Microsoft® System CLR Types for Microsoft® SQL Server® 2012 Microsoft® SQL Server® 2012 Shared Management Objects Microsoft Enterprise Library 5.0 (for the generated code) Windows Azure SDK (for layered cloud applications) Silverlight 5 SDK (for Silverlight applications) THE RELEASE This release only works on Visual Studio 2012. Known Issue If you choose the Database project, the solution unfolding time will be slow....Fiskalizacija za developere: FiskalizacijaDev 2.0: Prva prava produkcijska verzija - Zakon je tu, ova je verzija uskladena sa trenutno važecom Tehnickom specifikacijom (v1.2. od 04.12.2012.) i spremna je za produkcijsko korištenje. Verzije iza ove ce ovisiti o naknadnim izmjenama Zakona i/ili Tehnicke specifikacije, odnosno, o eventualnim greškama u radu/zahtjevima community-a za novim feature-ima. Novosti u v2.0 su: - That assembly does not allow partially trusted callers (http://fiskalizacija.codeplex.com/workitem/699) - scheme IznosType...Bootstrap Helpers: Version 1: First releaseDirectX Tool Kit: December 11, 2012: December 11, 2012 Ex versions of DDSTextureLoader and WICTextureLoader Removed use of ATL's CComPtr in favor of WRL's ComPtr for all platforms to support VS Express editions Updated VS 2010 project for official 'property sheet' integration for Windows 8.0 SDK Minor fix to CommonStates for Feature Level 9.1 Tweaked AlphaTestEffect.cpp to work around ARM NEON compiler codegen bug Added dxguid.lib as a default library for Debug builds to resolve GUID link issuesArcGIS Editor for OpenStreetMap: ArcGIS Editor for OSM 2.1 Final for 10.1: We are proud to announce the release of ArcGIS Editor for OpenStreetMap version 2.1. This download is compatible with ArcGIS 10.1, and includes setups for the Desktop Component, Desktop Component when 64 bit Background Geoprocessing is installed, and the Server Component. Important: if you already have ArcGIS Editor for OSM installed but want to install this new version, you will need to uninstall your previous version and then install this one. This release includes support for the ArcGIS 1...SharpCompress - a fully native C# library for RAR, 7Zip, Zip, Tar, GZip, BZip2: SharpCompress 0.8.2: This release just contains some fixes that have been done since the last release. Plus, this is strong named as well. I apologize for the lack of updates but my free time is less these days.New ProjectsAzke: New: Azke is a portal developed with ASP.NET MVC and MySQL. Old: Azke is a portal developed with ASP.net and MySQL.BasicallyNot Visual Studio 2010 Extension: "BasicallyNot" is a new Visual Studio 2010 Extension. It is designed to "drastically improve your VB.Net productivity", and of course make you think happy thoughts about cookies.Beautiful Code: These are collections of random code that I have written, which I believe are "beautiful" in some respects (algorithm, usage of language features etc.).bjyxl2: a csla project for myself.Buscayasminas: Buscayasminas is an open source "Minesweeper" alike game totally written in DHTML (JavaScript, CSS and HTML) that uses mouse and keyboard optionally. This cross-platform and cross-browser game was tested under BeOS, Linux, *BSD, Windows and others.Check if Knowledge Base fix is installed script: A handy script that checks if a knowledge base fix is installed or not.cnbeta: CNBETA ???????CSDN ??: CSDN????????IT??DateTime Class: DateTime Class with several methods: -NumberOfBusinessDaysFrom -IsWorkDay -NextBusinessDay -PreviousBusinessDayECSE6770: An web application for Software Engineering at RPI Hartford.Google+ for Windows Phone 7: Nothing here now.Koch Curve in Silverlight: This program generates the Koch curve using the Silverlight browser plugin.LINUX????????: LINUX????????longchang capture project: this is the project of longchang traffic police capture.Luna Programming Editor: Luna Programming Editor aims to be a simple but very functional, open source programming editor for developers who want to be more productive.markgrovestest: Azure TestMerge PDF Files: This class implement the merge of PDF filesMetroWeb: Metro web is a new modern web browser that provide a different experience for web browsing it just show any traditional web site as a metro designed websiteMinecraft 1.4.4 -- Learning Java: But a simple attempt at modding Minecraft over two different computers not on the same network.Nhóm CKT11: chia s? code nhóm ckt11Orchard.DecoratorField: Orchard Module to add new fieldsPhysic Engine: Physic EnginePixentration: UIS projectPomidoro: Windows store app: timer, which can be used in the application of 'Pomodoro Technique'.ROBO XERO Control: ROBO XERO ??????????????????????。ruc: Buscar en RUC de Paraguay.Send Email Class: Generic class to send emailsServiceProcessManagement: ?????SPMSeven Zip Wrapper: This small application which allows to call 7zip to create an archive, but skip compression for specific file extensions, which are usually already compressed.SharpShell: SharpShell is a .NET class library that lets you build Windows Shell Extensions using C# or VB.Silverseed.Core: Silverseed.Core is planned to be a common library for a variety of tools I'm planning to write, one of which is already available at Codeplex: [url:RepoCop|http://repocop.codeplex.com].Sistemas De Seguridad: integrantes jorge sara marieta douglassSomeTD: someSourPresser: komprese zdrojoveho kodu, zakodovani do B64 a oznaceni jako "nekompiluj" pro CIL kompilator. ....nekdy uzitecne.....The Curse: The Curse UO. Helping make the runUO community better.TIF Manipulation (Image): Tif Image Manipulation (Split, GetPage, Save Tif format...)Tiny Image Filters: This is a basic image processing library for Windows Phone. It is going to help developing photo effect app on Windows Phone.TrainGroup: This LightSwitch Project aims to be a simple management tool for any kind of training groups.Windows 7 Logon Tweaker: A Simple Software Used To Change The Logon Background Of Windows 7Windows Disguiser: Windows Disguiser is a little program that allows to automatically disguise minimized windows into the system tray.Windows Forms Metro: This project aims to create a library of controls & templates of Windows 8 Metro Style UI elements, for those who still using/loves windows forms.WPF Open Dialog: WPF Open Dialog is a simple and free open file/folder dialog for WPF using MVVM pattern. ???: ????????

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• CSS and HTML incoherences when declaring multiple classes

  - by Cesco

  I'm learning CSS "seriously" for the first time, but I found the way you deal with multiple CSS classes in CSS and HTML quite incoherent. For example I learned that if I want to declare multiple CSS classes with a common style applied to them, I have to write: .style1, .style2, .style3 { color: red; } Then, if I have to declare an HTML tag that has multiple classes applied to it, I have to write: <div class="style1 style2 style3"></div> And I'm asking why? From my personal point of view it would be more coherent if both could be declared by using a comma to separate each class, or if both could be declared using a space; after all IMHO we're still talking about multiple classes, in both CSS and HTML. I think that it would make more sense if I could write this to declare a div with multiple classes applied: <div class="style1, style2, style3"></div> Am I'm missing something important? Could you explain me if there's a valid reason behind these two different syntaxes?

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• Dapper and object validation/business rules enforcement

  - by Eugene

  This isn't really Dapper-specific, actually, as it relates to any XML-serializeable object.. but it came up when I was storing an object using Dapper. Anyways, say I have a user class. Normally, I'd do something like this: class User { public string SIN {get; private set;} public string DisplayName {get;set;} public User(string sin) { if (string.IsNullOrWhiteSpace(sin)) throw new ArgumentException("SIN must be specified"); this.SIN = sin; } } Since a SIN is required, I'd just create a constructor with a sin parameter, and make it read-only. However, with a Dapper (and probably any other ORM), I need to provide a parameterless constructor, and make all properties writeable. So now I have this: class User: IValidatableObject { public int Id { get; set; } public string SIN { get; set; } public string DisplayName { get; set; } public IEnumerable<ValidationResult> Validate(ValidationContext validationContext) { // implementation } } This seems.. can't really pick the word, a bad smell? A) I'm allowing to change properties that should not be changed ever after an object has been created (SIN, userid) B) Now I have to implement IValidatableObject or something like that to test those properties before updating them to db. So how do you go about it ?

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• Web workflow solution - how should I approach the design?

  - by Tom Pickles

  We've been tasked with creating a web based workflow tool to track change management. It has a single workflow with multiple synchronous tasks for the most part, but branch out at a point to tasks running in parallel which meet up later on. There will be all sorts of people using the application, and all of them will need to see their outstanding tasks for each change, but only theirs, not others. There will also be a high level group of people who oversee all changes, so need to see everything. They will need to see tasks which have not been done in the specified time, who's responsible etc. The data will be persisted to a SQL database. It'll all be put together using .Net. I've been trying to learn and implement OOP into my designs of late, but I'm wondering if this is moot in this instance as it may be better to have the business logic for this in stored procedures in the DB. I could use POCO's, a front end layer and a data access layer for the web application and just use it as a mechanism for CRUD actions on the DB, then use SP's fired in the DB to apply the business rules. On the other hand, I could use an object oriented design within the web app, but as the data in the app is state-less, is this a bad idea? I could try and model out the whole application into a class structure, implementing interfaces, base classes and all that good stuff. So I would create a change class, which contained a list of task classes/types, which defined each task, and implement an ITask interface etc. Put end-user types into the tasks to identify who should be doing what task. Then apply all the business logic in the respective class methods etc. What approach do you guys think I should be using for this solution?

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• IIM Calcutta &ndash; EPBM 14 &ndash; Campus Visit &ndash; Day 4 &ndash; Managing Self, SDCC and Gari

  - by Ram Shankar Yadav

  …I’m becoming more of an addict of writing about my experiences, here in Kolkata! Today we started a bit of late at around 8 AM, did our breakfast and reached in class a bit late at around 9:50 AM, and here goes the surprise…. Today we had two lectures on “Managing Self” and two lectures on “Sustainable Development and Climate Change” (SDCC). Some of us got few self discipline lessons the moment they entered class and asked to “get out” :D So frankly speaking it was a nostalgic moment, which reminded us of Collage ;) We did a FIRO-B test as and got very good tips on managing ourselves and differentiate between “manager” and “leader” After the lunch we had our session on SDCC, in which the prof started by explaining “Credit Crisis”, and moved on to Sustainable Development and few great examples from industry and life~! After the class we went for shopping at Garihat Market, we ate Pani Puri and Moodi :P ..one more surprise…my room got flooded with lot of my new ePBM friends to take the copy of the pictures and we did lot of chit chat around anything and everything :D …so far so good…it’s an amazing experience for me and hopefully for others….who came out of their daily chores and went back to the nostalgic lanes of friendship, learning and most importantly “Happyness” ~~~ Cheers, ram :) EPBM 14 pics : http://epbm14.shutterfly.com/pictures

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• How add fog with pixel shader (HLSL) XNA?

  - by Mehdi Bugnard

  I started to make a small game in XNA . And recently i tried to add a "fog" on "pixel shader HLSL" with the class Effect from XNA . I search online about some tutorial and found many sample. But nothing want work on my game :-( . Before i already add a "fog" effect in my game and everything work, because i used the class "BasicEffect" but with the class "Effect" and HLSL, it's really more complicated. If somebody have an idea, it's will be wonderfull. Thanks again. Here is my code HLSL, i use. // Both techniques share this same pixel shader. float4 PixelShaderFunction(VertexShaderOutput input) : COLOR0 { //return tex2D(Sampler, input.TextureCoordinate) * input.Color; float d = length(input.TextureCoordinate - cameraPos); float l = saturate((d-fogNear)/(fogFar-fogNear)); float fogFactory = clamp((d - fogNear) / (fogFar - fogNear), 0, 1) * l; return tex2D(Sampler, input.TextureCoordinate) * lerp(input.Color, fogColor, fogFactory); } Here is the screenShot With effect Without effect

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• SQL Server for the Oracle DBA Links

  - by BuckWoody

  I do a presentation (and a class) called "SQL Server for the Oracle DBA". It's a non-marketing overview that gives you the basics of working with SQL Server if you're already familiar wtih how Oracle works. This class and these links DO NOT help you with "Why should I use Oracle/SQL Server instead of Oracle/SQL Server" - I'll assume you're already there, and if not, there are LOTS of sites to help you make that decision. Although these links might contain slight marketing slants (I don't control them) I've tried to get the best links I can. Feel free to comment here to add more/better links. As such, these aren't links that help you work with Oracle - they are links to help you work with SQL Server. Some of them contain more information than you actually need, others don't have near enough. Taken together (and with the class) you're able to get done what you need to do. "Practical SQL Server for Oracle Professionals" - A Microsoft Whitepaper, probably the best place to get started: http://download.microsoft.com/download/6/9/d/69d1fea7-5b42-437a-b3ba-a4ad13e34ef6/SQLServer2008forOracle.docx Free Training: http://technet.microsoft.com/en-us/sqlserver/dd548020.aspx Classroom training (will cost you): http://www.microsoft.com/learning/en/us/course.aspx?ID=50068A&locale=en-us Terminology Differences: http://www.associatedcontent.com/article/2383466/oracle_and_sql_server_basic_terminology.html Datatype mapping between Oracle and SQL Server: http://msdn.microsoft.com/en-us/library/ms151817.aspx The "other" direction - can still be useful for the Oracle professional to see the other side: http://blog.benday.com/archive/2008/10/23/23195.aspx Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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• How to use T4 templates in WP7, Silverlight, Desktop or even MonoDroid apps

  - by Daniel Cazzulino

  In other words, how to use T4 templates without ANY runtime dependencies? Yes, it is possible, and quite simple and elegant actually. In a desktop project, just open the Add New Item dialog, and search for "text template": From the two available templates, the one that gives you a zero-dependency runtime-usable template is the first one: Preprocessed Text Template. Once unfolded, you get the .tt file, but also a dependent .cs file automatically generated. Note the Custom Tool associated with the file: If you open up the .cs file, you will see that it doesn't contain the rendered "Hello World!!!" I added in the .tt, but rather a full class named after the template file itself: namespace ConsoleApplication1 { using System; #line 1 "C:\Temp\ConsoleApplication1\ConsoleApplication1\PreTextTemplate1.tt" [System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.TextTemplating", "10.0.0.0")] public partial class PreTextTemplate1 : PreTextTemplate1Base { public virtual string TransformText() { this.GenerationEnvironment = null; this.Write("Hello World!!!"); return this.GenerationEnvironment.ToString(); } } #region Base class ... #endregion } ... Read full article

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• How to implement jquery and Mootools together ?

  - by Avi Kumar Manku

  I am developing a website in which I am implementing two slider for images gallery using one with jQuery and one with moottools. But there is problem in implementing these because when I use both together the jQuery slider doesn't works where mootools slider works. jQuery slider works in case where I remove mootools. What should I do to implement both sliders together? Any suggestions will be helpful. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Tresmode | Footwear &amp; Accessories</title> <script type="text/javascript" src="js/jquery-1.5.min.js"></script> <script src="js/jquery.easing.1.3.js" type="text/javascript"></script> <script src="js/jquery.slideviewer.1.2.js" type="text/javascript"></script> <!-- Syntax hl --> <script src="js/jquery.syntax.min.js" type="text/javascript" charset="utf-8"></script> <script type="text/javascript"> $(window).bind("load", function() { $("div#mygaltop").slideView({toolTip: true, ttOpacity: 0.5}); $("div#mygalone").slideView(); //if leaved blank performs the default kind of animation (easeInOutExpo, 750) $("div#mygaltwo").slideView({ easeFunc: "easeInOutBounce", easeTime: 2200, toolTip: true }); $("div#mygalthree").slideView({ easeFunc: "easeInOutSine", easeTime: 100, uiBefore: true, ttOpacity: 0.5, toolTip: true }); }); $(function(){ $.syntax({root: 'http://www.gcmingati.net/wordpress/wp-content/themes/giancarlo-mingati/js/jquery-syntax/'}); }); </script> <link href="css/style.css" rel="stylesheet" type="text/css" /> <link href="css/product.css" rel="stylesheet" type="text/css" /> <link href="css/scroll.css" rel="stylesheet" type="text/css" /> <!--[if lte IE 8]> <link href="css/ieonly.css" rel="stylesheet" type="text/css" /> <![endif]--> <script language="javascript" type="text/javascript" src="js/mootools-1.2-core.js"></script> <script language="javascript" type="text/javascript" src="js/mootools-1.2-more.js"></script> <script language="javascript" type="text/javascript" src="js/SlideItMoo.js"></script> <script language="javascript" type="text/javascript"> window.addEvent('domready', function(){ /* thumbnails example , links only */ new SlideItMoo({itemsVisible:5, // the number of thumbnails that are visible currentElement: 0, // the current element. starts from 0. If you want to start the display with a specific thumbnail, change this thumbsContainer: 'thumbs', elementScrolled: 'thumb_container', overallContainer: 'gallery_container'}); /* thumbnails example , div containers */ new SlideItMoo({itemsVisible:5, // the number of thumbnails that are visible currentElement: 0, // the current element. starts from 0. If you want to start the display with a specific thumbnail, change this thumbsContainer: 'thumbs2', elementScrolled: 'thumb_container2', overallContainer: 'gallery_container2'}); /* banner rotator example */ new SlideItMoo({itemsVisible:1, // the number of thumbnails that are visible showControls:0, // show the next-previous buttons autoSlide:2500, // insert interval in milliseconds currentElement: 0, // the current element. starts from 0. If you want to start the display with a specific thumbnail, change this transition: Fx.Transitions.Bounce.easeOut, thumbsContainer: 'banners', elementScrolled: 'banner_container', overallContainer: 'banners_container'}); }); </script> </head> <body> <div id="landing"> <!-- landing page menu --> <div id="landing_menu"> <ul> <li><a class="active" href="#">SPECIALS</a></li> <li><a href="#">SHOP MEN'S</a></li> <li class="none"><a class="none" href="#">SHOP WOMEN'S</a></li> </ul> </div> <!-- landing page menu --> <!-- loading container menu --> <div id="container_part"> <div id="big_image_slider"> <!-- <img src="images/briteloves.png" alt="Britelove" /> --> <div id="mygaltop" class="svw"> <ul> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/briteloves.png" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/1.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/2.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/3.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/4.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/5.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/6.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/7.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/8.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/9.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/10.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/11.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/12.jpg" /></li> </ul> </div> </div> <div class="new_style_banner"><img src="images/new_styles.png" alt="new style" /></div> <div class="new_style_banner"><img src="images/ford-super-models.png" alt="ford super models" /></div> </div> <!--- loading container menu --> <!-- footer scrool ---> <div id="footer_scroll"> <!--thumbnails slideshow begin--> <div id="gallery_container"> <div id="thumb_container"> <div id="thumbs"> <a href="gallery/full/DC080302018.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/1.jpg"/></a> <a href="gallery/full/DC080302028.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/2.jpg" /></a> <a href="gallery/full/DC080302030.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/3.jpg"/></a> <a href="gallery/full/DC080302018.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/4.jpg" /></a> <a href="gallery/full/DC080302028.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/5.jpg" /></a> <a href="gallery/full/DC080302030.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/6.jpg"/></a> <a href="gallery/full/DC080302018.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/1.jpg"/></a> <a href="gallery/full/DC080302028.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/2.jpg" /></a> <a href="gallery/full/DC080302030.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/7.jpg"/></a> <a href="gallery/full/DC080302018.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/8.jpg" /></a> <a href="gallery/full/DC080302028.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/9.jpg" /></a> <a href="gallery/full/DC080302030.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/10.jpg"/></a> </div> </div> </div> <!--thumbnails slideshow end--> </div> <!-- foooter scrooll --> </div> <script type="text/javascript"> var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); </script> <script type="text/javascript"> var pageTracker = _gat._getTracker("UA-2064812-2"); pageTracker._initData(); pageTracker._trackPageview(); </script> </body> </html>

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• Collision detection on a 2D hexagonal grid

  - by SundayMonday

  I'm making a casual grid-based 2D iPhone game using Cocos2D. The grid is a "staggered" hex-like grid consisting of uniformly sized and spaced discs. It looks something like this. I've stored the grid in a 2D array. Also I have a concept of "surrounding" grid cells. Namely the six grid cells surrounding a particular cell (except those on the boundries which can have less than six). Anyways I'm testing some collision detection and it's not working out as well as I had planned. Here's how I currently do collision detection for a moving disc that's approaching the stationary group of discs: Calculate ij-coordinates of grid cell closest to moving cell using moving cell's xy-position Get list of surrounding grid cells using ij-coordinates Examine the surrounding cells. If they're all empty then no collision If we have some non-empty surrounding cells then compare the distance between the disc centers to some minimum distance required for a collision If there's a collision then place the moving disc in grid cell ij So this works but not too well. I've considered a potentially simpler brute force approach where I just compare the moving disc to all stationary discs at each step of the game loop. This is probably feasible in terms of performance since the stationary disc count is 300 max. If not then some space-partitioning data structure could be used however that feels too complex. What are some common approaches and best practices to collision detection in a game like this?

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