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• In a 2D tile-based game, how should NPCs and tiles reference each other?

  - by lezebulon

  I'm making a tile engine for 2D games (seen from the top). Basically the world is composed of a grid of tiles. Now I want to put for instance NPCs that can move on the map. What do you think is best: 1) each tile has a pointer to the NPC that is on its tile, or a NULL pointer 2) having a list of NPCs, and they have the coordinates of the tile they are on. 3) something else? 1) is faster for collision detection but it would use much more memory space and it is slower to find all NPCs in a map. 2) is the opposite. thanks

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• New Development Snapshot

  I finally did the work necessary to improve the codegen for finally handlers. More improvements are still possible, but at least most finally handlers will now execute without touching the exception object (and hence without having to do any mapping/stack trace collection work). It also means that assembly file sizes are a little bit smaller and that the debugging experience should be improved (less exception catching & rethrowing). Changes: ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Copy and Paste problems in Visual Studio 2010

  tweetmeme_source = 'alpascual';After installing Visual Studio 2010 I started having problems with Copy and Paste. Trying to find out how many users are being affected by this bug. The use case to reproduce the bug, just using VS2010 for a few minutes and eventually doing Control C and Control V to copy lines of code does not work. Using the menu to do the copy and paste also wont work. Looks like a problem in the clipboard itself IMHO. The set up of my computer. Windows 7 Professional with 4...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• box2d and constant movement

  - by Arnas

  i'm developing a game with a top down view, the players body is a circle. To move the character you need to tap on the screen and it moves to the spot. To achieve this i'm saving the coordinate of the touch and call a method every frame which applies linear velocity to the body with a vector of the direction the body should go _body->SetLinearVelocity(b2Vec2((a.x - currPos.x)/SPEED_RATIO,(size.height - a.y - currPos.y)/SPEED_RATIO)); //click position - current position, screen height - click position (since the y axis is flipped, (0,0) is in the bottom left ) - current position = vector of the direction we want to go now the problem with this is that the body slows down until it finally stops when getting closer to the point we want it to go, since the closer we are to that point the lenght of the vector gets smaller. Besides that i've read that it's bad practice to set linear velocity in box2d and i should use apply force instead, but that way the forces would add up and overshoot the target where it's supposed to stop. So what i'm asking is how to move a box2d body to a coordinate in constant speed.

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• ASP.NET Tooltips Extender Control

  Tooltips is always a good usability practice to display descripitve and meaningful message on UI, which provide guidance and extra information to users visually. However, I cannot find this kind of handy "control" in the latest version (40412) of the AJAX control toolkit. (Feature request?) The traditional HTML "title" or "tooltips" tag of control cannot make the users (nor even developers) happy, so I searched and found this Tooltip Extender control today. It is nice and handy for...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• IE HTML Debugger Causing Issues with IE Enhanced Security

  - by Damon

  In an effort to debug a Silverlight component on a page in SharePoint I opened the Developer Tools in Internet Explorer.  After choosing the Find > Select Element by Click option my page refreshed for some reason and a small bar appeared at the top of the page reading: You may be trying to access this site from a secured browser on the server. Please enable scripts and reload this page. After a quick look around the internet, some seemed to be suggesting that you have to disable the Internet Explorer Enhanced Security Configuration (IE ESC) in Server Manager.  Since this is one of the very first things I do when creating a VM, I figured the solution did not apply to me.  However, I decided to go ahead and enable IE ESC and then disable it again to see if that would fix the problem, and it did.  So if you see that error message in IE, the bar and you've already got IE ESC disabled, you can just enable it and disable it to get rid of the bar.

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• How best to merge/sort/page through tons of JSON arrays?

  - by Joshiatto

  Here's the scenario: Say you have millions of JSON documents stored as text files. Each JSON document is an array of "activity" objects, each of which contain a "created_datetime" attribute. What is the best way to merge/sort/filter/page through these activities via a web UI? For example, say we want to take a few thousand of the documents, merge them into a gigantic array, sort the array by the "created_datetime" attribute descending and then page through it 10 activities at a time. Also keep in mind that roughly 25% of these JSON documents are updated every day, and updates have to make it into the view within 5 minutes. My first thought is to parse all of the documents into an RDBMS table and then it would just be a simple query such as "select top 10 name, created_datetime from Activity where user_id=12345 order by created_datetime desc". Some have suggested I use NoSQL techniques such as hadoop or map/reduce instead. How exactly would this work? For more background, see: Why is NoSQL better for this scenario?

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• Backward Compatibility with Silverlight 4 applications

  Each release of Silverlight it is the goal to make sure existing Silverlight applications continue to work. Since I think what this means causes some confusion Im going to do my best to explain what we mean by this. Silverlight 3 application working with Silverlight 4 Okay, scenario 1 is I have a Silverlight 3 application (XAP), will that still work as-is in Silverlight 4? Yes, this is the situation we refer to as backward compatibility. What this means is that existing compiled XAPs under previous...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Content Optimization only?

  - by danie7L T

  There are tons of discussions around tips&tricks to improve Search Engines "ranking" and SEOs. What if the focus of the webmaster/client is 100% set on the quality of the content with precise keywords in meta tags, clean design, regular articles updates, clean URLs and highly filtered external links leading to pages on websites dealing on the same,or related subjects; isn't it the job of a good search engine like Google to catch this website and show it in its front-page ? Or does Search Engines count on us to help them find us, and webmasters will always have to be up-to-date regarding SEO tools and rules updates on top of websites' design, browsers customization, progressive enhancement etc ?

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• Update information outdated, "Failed to fetch cdrom"

  - by user285603

  I have a warning triangle on the top of my screen. When I click on it, it says that my update information is outdated. When I type sudo apt-get update && sudo apt-get upgrade into a terminal, I get this message: W: Failed to fetch cdrom://Ubuntu 14.04 LTS _Trusty Tahr_ - Release i386 (20140417)/dists/trusty/main/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs W: Failed to fetch cdrom://Ubuntu 14.04 LTS _Trusty Tahr_ - Release i386 (20140417)/dists/trusty/restricted/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs E: Some index files failed to download. They have been ignored, or old ones used instead. Any ideas?

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• Lost volume control OSD for Ubuntu

  - by Vultan

  I've been happily chugging along with Ubuntu 14.04 (love it), and something I must have done removed the on screen notification when I change the volume via keyboard buttons. When I change the volume via the keyboard, it works, I can hear the alert telling me I've done it, and the small volume indicator in the panel does show the change, but I used to see a pop up rounded rectangle in the top right of the screen that showed me clearer feedback when I changed volume via the keyboard. It's now gone. Can anyone offer any help in bringing it back?

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• How do I implement a "sliding out of / into" effect on a settings menu similar to that in Angry Birds?

  - by VictorB

  I'm trying to implement a settings menu component similar to that in Angry Birds - a button control that makes an options menu slide out of it and back into it when clicked on. I use scene2d.ui to build the UI components: a Button in a Table to implement the button control, a Table to implement the options menu, and a Stack to lay these out one on top of the other and at this moment I have the following behavior: When the user hits the button control for the first time, then the alpha of the table component is set to 1; When the user hits the button control the second time, then the alpha of the table component is set to 0; And so on. Any ideas how I can get the sliding out of and into effect on user clicks with libgdx? Similar to what Angry Birds provides. Maybe using the TweenEngine, actions, interpolations, combinations of these? Thanks in advance.

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• To canvas, or not to canvas, when building browser-based games?

  - by Letharion

  Background: I have extensive development background, but the last time I coded a game was many years ago. My Javascript skills are quite limited, and I intend to improve them by building a simple game — Tetris, Pac-man, or something of that complexity level. Question: It seems to me that a fundamental choice I need to make is whether I should render on a <canvas> element or not. With a canvas, I have basic tools for rendering points, lines, and more complex things on top of that. Presumably there are, or will be, also various frameworks to help with this. Without a canvas, I could keep my objects in the DOM-tree, like a regular webpage, only quite complex, with many overlapping elements. Is one approach better than the other? Are they mutually exclusive? How do I know which to pick?

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• Updates and New Home for Sticky Plugin

  Ive created a permanent home for the latest updates for Sticky. Please visit http://johnpapa.net/sticky to stay updated on the latest versions, enhancements, and how tos for Sticky. To download the latest update go here. The latest update includes some bug fixes and added a few enhancements in the latest version: 1.0.50605. Here are the highlights: Choose your Sticky color in the Settings Numbers are formatted Better error handling for invalid data Minor graphical fixes The Settings...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Nevron .NET Vision 2010 Vol.1 SP9 released VS2010 support

  We are pleased to announce the release of the new service pack for Nevron .NET Vision 2010 Vol.1. The service pack introduces: - Support for Visual Studio 2010 - new installation for VS2010 is available for download - Update for all installation version Nevron .NET Vision for VS2005, VS2008 and VS2010 - Significant performance improvements in the Chart Sampled Series Nevron .NET Vision 2010 Vol.1 SP9 is now available for download: http://www.nevron.com/Downloads.Download.aspx To download the latest...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• My talk at the Launch of the Vancouver Silverlight User Group

  Last week I did a presentation for the Launch of the new Vancouver Silverlight User Group (http://vanslug.net). I had a touch screen laptop so I started my presentation with the Multi Touch Silverlight Puzzle demo, wow effect guaranteed!   So 80 people were Rickrolled this night! You can download and try this demo from this link: http://www.silverlight.net/community/samples/silverlight-4/html-puzzle/   My presentation was mostly inspired by this awesome MIX10 session: Microsoft...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Machine check error while booting from USB

  - by javanna

  I put the last Ubuntu iso on my USB stick using UNetBootin, after formatting it to fat32. I've already done that before with other operating systems and it worked. I can't actually boot Ubuntu from USB since I get a black screen with the error "Machine check error" on top the an automatic reboot happens. The error appears right after the boot, I can't see anything else before. I'm using my ASUS K53SV latop. Does anybody know how to solve this?

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• Creating Visual Studio Extension Files (VSIX) for Template Deployment

  While working on some plugins for the new Seesmic Desktop PlatformI got sick of copying and pasting some boiler plate code over and over. I had created some helper templates for myself so that I could say FileNew Seesmic Desktop Plugin and get everything I needed initially. This weekend I had some time and formalized those templates into an easy-to-use installer for anyone to consume. NOTE: It is likely that Seesmic themselves will create developer project/item templatesthese were for my own...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• HackingSilverlight Code Browser

  So sometime ago I had been working on a sample browser for all the different samples I had used for hackingsilverlight and for blog posts. After awhile with all the jumping around between projects, and my failing memory I found I needed a quick easy way to remember all the code clips I used often. For me I needed something like a rola-deck for code so after taking my toys and leaving the sandbox as it were regarding the book HackingSilverlight between projects for the 5 minutes here or there I've...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• SQLAuthority News Microsoft SQL Server 2005/2008 Query Optimization & Performance Tuning Training

  Last 3 days to register for the courses. This is one time offer with big discount. The deadline for the course registration is 5th May, 2010. There are two different courses are offered by Solid Quality Mentors 1) Microsoft SQL Server 2005/2008 Query Optimization & Performance Tuning – Pinal Dave Date: May 12-14, 2010 Price: [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• What is the correct way to reset and load new data into GL_ARRAY_BUFFER?

  - by Geto

  I am using an array buffer for colors data. If I want to load different colors for the current mesh in real time what is the correct way to do it. At the moment I am doing: glBindVertexArray(vao); glBindBuffer(GL_ARRAY_BUFFER, colorBuffer); glBufferData(GL_ARRAY_BUFFER, SIZE, colorsData, GL_STATIC_DRAW); glEnableVertexAttribArray(shader->attrib("color")); glVertexAttribPointer(shader->attrib("color"), 3, GL_FLOAT, GL_TRUE, 0, NULL); glBindBuffer(GL_ARRAY_BUFFER, 0); It works, but I am not sure if this is good and efficient way to do it. What happens to the previous data ? Does it write on top of it ? Do I need to call : glDeleteBuffers(1, colorBuffer); glGenBuffers(1, colorBuffer); before transfering the new data into the buffer ?

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• SQL SERVER Difference Between GETDATE and SYSDATETIME

  Sometime something so simple skips our mind. I never knew the difference between GETDATE and SYSDATETIME. I just ran simple query as following and realized the difference. SELECT GETDATE() fn_GetDate, SYSDATETIME() fn_SysDateTime In case of GETDATE the precision is till miliseconds and in case of SYSDATETIME the precision is till nanoseconds. Now the questions is [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• And the winner of the Umbraco CodeGarden&rsquo;10 giveaway is&hellip;

  Michele Minorello, aka minorello, from Padova, Italy. If you didnt win, dont despair: there are still places available, and if you took part in this competition (and even if you didnt) you can buy a ticket with 75 discount (375 instead of the regular price of 450), using the coupon code SIMONECHIARETTA. Back to the giveaway: Last week I announced that, with the help of Niels Hartvig, I was giving away one free ticket for the umbraco CodeGarden 2010 and 4 nights in the hotel. Signing up for the...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Grub-Customizer made Windows 7 disappear from Gurb2

  - by user199055

  I am running dual-boot Ubuntu 12.04/Windows7. I wanted to change the boot order in Grub2 to have Windows on top of the list. I installed Grub-Customizer on Ubuntu 12.04 using the following terminal commands copied from another post: sudo add-apt-repository ppa:adabbas/1stppa sudo apt-get update sudo apt-get install grub-customizer After installing, I launched Grub-Customizer from Dash Home. Windows 7 does not appear in the list. I closed the program and was prompted to save the current settings. Upon rebooting, Windows did not appear in the Grub2 list. I went back into Grub-Customizer and clicked the "Revert" button but still no Windows 7. Does anyone know how I can fix this?

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• Jumping over non-stationary objects without problems ... 2-D platformer ... how could this be solved? [on hold]

  - by help bonafide pigeons

  You know this problem ... take Super Mario Bros. for example. When Mario/Luigi/etc. comes in proximity with a nearing pipe image an invisible boundary setter must prevent him from continuing forward movement. However, when you jump and move both x and y you are coordinately moving in two dimensions at an exact time. When nearing the pipe in mid-air as you are falling, i.e. implementation of gravity in the computer program "pulling" the image back down, and you do not want them to get "stuck" in both falling and moving. That problem is solved, but how about this one: The player controlling the ball object is attempting to jump and move rightwards over the non-stationary block that moves up and down. How could we measure its top and lower x+y components to determine the safest way for the ball to accurately either fall back down, or catch the ledge, or get pushed down under it, etc.?

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