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  • Keyboard input system handling

    - by The Communist Duck
    Note: I have to poll, rather than do callbacks because of API limitations (SFML). I also apologize for the lack of a 'decent' title. I think I have two questions here; how to register the input I'm receiving, and what to do with it. Handling Input I'm talking about after the fact you've registered that the 'A' key has been pressed, for example, and how to do it from there. I've seen an array of the whole keyboard, something like: bool keyboard[256]; //And each input loop check the state of every key on the keyboard But this seems inefficient. Not only are you coupling the key 'A' to 'player moving left', for example, but it checks every key, 30-60 times a second. I then tried another system which just looked for keys it wanted. std::map< unsigned char, Key keyMap; //Key stores the keycode, and whether it's been pressed. Then, I declare a load of const unsigned char called 'Quit' or 'PlayerLeft'. input-BindKey(Keys::PlayerLeft, KeyCode::A); //so now you can check if PlayerLeft, rather than if A. However, the problem with this is I cannot now type a name, for example, without having to bind every single key. Then, I have the second problem, which I cannot really think of a good solution for: Sending Input I now know that the A key has been pressed or that playerLeft is true. But how do I go from here? I thought about just checking if(input-IsKeyDown(Key::PlayerLeft) { player.MoveLeft(); } This couples the input greatly to the entities, and I find it rather messy. I'd prefer the player to handle its own movement when it gets updated. I thought some kind of event system could work, but I do not know how to go with it. (I heard signals and slots was good for this kind of work, but it's apparently very slow and I cannot see how it'd fit). Thanks.

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  • data handling with javascript

    - by Vincent Warmerdam
    Python has a very neat package called pandas which allows for quick data transformation; tables, aggregation, that sort of thing. A lot of these types of functionality can also be found in the python itertools module. The plyR package in R is also very similar. Usually one woud use this functionality to produce a table which is later visualized with a plot. I am personally very fond of d3, and I would like to allow the user to first indicate what type of data aggregation he wants on the dataset before it is visualized. The visualisation in question involves making a heatmap where the user gets to select the size of the bins of the heatmap beforehand (I want d3 to project this through leaflet). I want to visually select the ideal size of the bins for the heatmap. The way I work now is that I take the dataset, aggregate it with python and then manually load it in d3. This is a process that takes a lot of human effort and I was wondering if the data aggregation can be done through the javascript of the browser. I couldn't find a package for javascript specifically built for data, suggesting (to me) that this is a bad idea and that one should not use javascript for the data handling. Is there a good module/package for javascript to handle data aggregation? Is it a good/bad idea to do the data aggregation in javascript (performance wise)?

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  • 2D Collision masks for handling slopes

    - by JiminyCricket
    I've been looking at the example at: http://create.msdn.com/en-US/education/catalog/tutorial/collision_2d_perpixel and am trying to figure out how to adjust the sprite once a collision has been detected. As David suggested at XNA 4.0 2D sidescroller variable terrain heightmap for walking/collision, I made a few sensor points (feet, sides, bottom center, etc.) and can easily detect when these points actually collide with non-transparent portions of a second texture (simple slope). I'm having trouble with the algorithm of how I would actually adjust the sprite position based on a collision. Say I detect a collision with the slope at the sprite's right foot. How can I scan the slope texture data to find the Y position to place the sprite's foot so it is no longer inside the slope? The way it is stored as a 1D array in the example is a bit confusing, should I try to store the data as a 2D array instead? For test purposes, I'm thinking of just using the slope texture alpha itself as a primitive and easy collision mask (no grass bits or anything besides a simple non-linear slope). Then, as in the example, I find the coordinates of any collisions between the slope texture and the sprite's sensors and mark these special sensor collisions as having occurred. Finally, in the case of moving up a slope, I would scan for the first transparent pixel above (in the texture's Ys at that X) the right foot collision point and set that as the new height of the sprite. I'm a little unclear also on when I should make these adjustments. Collisions are checked on every game.update() so would I quickly change the position of the sprite before the next update is called? I also noticed several people mention that it's best to separate collision checks horizontally and vertically, why is that exactly? Open to any suggestions if this is an inefficient or inaccurate way of handling this. I wish MSDN had provided an example of something like this, I didn't know it would be so much more complex than NES Mario style pure box platforming!

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  • Object oriented EDI handling in PHP

    - by Robert van der Linde
    I'm currently starting a new sub project where I will: Retrieve the order information from our mainframe Save the order information to our web-apps' database Send the order as EDI (either D01b or D93a) Receive the order response, despatch advice and invoice messages Do all kinds of fun things with the resulting datasets. However I am struggling with my initial class designs. The order information will be retrieved from the mainframe which will result in a "AOrder" class, this isn't a problem, I am not sure about how to mold this local object into an EDI string. Should I create EDIOrder/EDIOrderResponse/etc classes with matching decorators (EDIOrderD01BDecorator, EDIOrderD93ADecorator)? Do I need builder objects or can I do: // $myOrder is instance of AOrder $myOrder->toEDIOrder(); $decorator = new EDIOrderD01BDecorator($myOrder); $edi = $decorator->getEDIString(); And it'll have to work the other way around as well. Is the following code a good way of handling this problem or should I go about this differently? $ediString = $myEDIMessageBroker->fetch(); $ediOrderResponse = EDIOrderResponse::fromString($ediString); I'm just not so sure about how I should go about designing the classes and interactions between them. Thanks for reading and helping.

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  • C++ and system exceptions

    - by Abyx
    Why standard C++ doesn't respect system (foreign or hardware) exceptions? E.g. when null pointer dereference occurs, stack isn't unwound, destructors aren't called, and RAII doesn't work. The common advice is "to use system API". But on certain systems, specifically Win32, this doesn't work. To enable stack unwinding for this C++ code // class Foo; // void bar(const Foo&); bar(Foo(1, 2)); one should generate something like this C code Foo tempFoo; Foo_ctor(&tempFoo); __try { bar(&tempFoo); } __finally { Foo_dtor(&tempFoo); } Foo_dtor(&tempFoo); and it's impossible to implement this as C++ library. Upd: Standard doesn't forbid handling system exceptions. But it seems that popular compilers like g++ doesn't respect system exceptions on any platforms just because standard doesn't require this. The only thing that I want - is to use RAII to make code readable and program reliable. I don't want to put hand-crafted try\finally around every call to unknown code. For example in this reusable code, AbstractA::foo is such unknown code: void func(AbstractA* a, AbstractB* b) { TempFile file; a->foo(b, file); } Maybe one will pass to func such implementation of AbstractA, which every Friday will not check if b is NULL, so access violation will happen, application will terminate and temporary file will not be deleted. How many months uses will suffer because of this issue, until either author of func or author of AbstractA will do something with it? Related: Is `catch(...) { throw; }` a bad practice?

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  • Tiled Editor: How is this Map Handling Collision?

    - by user2736286
    BrowserQuest map in question. From what I understand, with tiled, there are two main ways to specify collision: Create an object layer, and interpret the shapes in the engine as collision objects. Create a tiled layer, and make all tiles in the layer have a collision property, and interpret all tiles in the layer as collision objects. I'm using BrowserQuest as a big source of inspiration for my project, and I want to know how they handled collision on the level editing side. I've checked through all their layers, expecting an object layer to be handling cliff collision like: But there are no such object layers to be found. Furthermore, the tile layers containing the tiles for such cliffs have no properties at all, meaning that they didn't just specify "collision" for such tile layers. I especially need to know how they handled less rectangular shapes like: I could imagine that they are not using explicit collision layers, but instead determining collision in the actual engine, based off the presence of specific tile layer sprites. Only because BrowserQuest has whole-tile movement, and it wouldn't look too odd if a small apple, taking up only a fraction of the tile size, prevents movement over that entire tile. But I'm creating a game with more precise movement, so collision has to be tight to the apple, and I really want to know how BrowserQuest approached collision defining. If anyone knowledgeable with Tiled could take a quick look at the map, I'd appreciate it! I'm tearing my hair out here :). Thanks

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  • Thoughts on exception handling.

    - by AndyScott
    Was working on a windows form app (something I haven't done in a while), adding threading and logging so that it would work a little more smoothly and have a record of who did what.  I was just about at the point where I was going to check it into source control when I noticed that the Output window was showing "A first chance exception of type 'System.InvalidCastException' occurred in mscorlib.dll", so I googled it.  In reading some threads about the error, I came across the following comment and it got me thinking: "In addition, while they should be avoided if possible, exceptions are a quite legitimate part of program execution. It's their going unhandled that is a real issue, because that means crashy, crashy." How do you normally use exception handling?  I feel that exceptions are intended to handle errors in code (in my experience generally related to bad data making its way into the system).  Now don't get me wrong, I understand that exceptions happen and should be dealt with, but I feel that they are a "last resort" to keep a program from crashing, but should never be a way to pass data or continue logical processing that could be handled in standard code flow. I mention this, because I have seen it done. What do you think?

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  • Are there legitimate reasons for returning exception objects instead of throwing them?

    - by stakx
    This question is intended to apply to any OO programming language that supports exception handling; I am using C# for illustrative purposes only. Exceptions are usually intended to be raised when an problem arises that the code cannot immediately handle, and then to be caught in a catch clause in a different location (usually an outer stack frame). Q: Are there any legitimate situations where exceptions are not thrown and caught, but simply returned from a method and then passed around as error objects? This question came up for me because .NET 4's System.IObserver<T>.OnError method suggests just that: exceptions being passed around as error objects. Let's look at another scenario, validation. Let's say I am following conventional wisdom, and that I am therefore distinguishing between an error object type IValidationError and a separate exception type ValidationException that is used to report unexpected errors: partial interface IValidationError { } abstract partial class ValidationException : System.Exception { public abstract IValidationError[] ValidationErrors { get; } } (The System.Component.DataAnnotations namespace does something quite similar.) These types could be employed as follows: partial interface IFoo { } // an immutable type partial interface IFooBuilder // mutable counterpart to prepare instances of above type { bool IsValid(out IValidationError[] validationErrors); // true if no validation error occurs IFoo Build(); // throws ValidationException if !IsValid(…) } Now I am wondering, could I not simplify the above to this: partial class ValidationError : System.Exception { } // = IValidationError + ValidationException partial interface IFoo { } // (unchanged) partial interface IFooBuilder { bool IsValid(out ValidationError[] validationErrors); IFoo Build(); // may throw ValidationError or sth. like AggregateException<ValidationError> } Q: What are the advantages and disadvantages of these two differing approaches?

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  • Javascript how can I trigger an event that was prevented

    - by Mike Robinson
    In my app a user clicks a link to another page. I'd like to track that in Omniture with a custom event, so I've bound the omniture s.t() event to the click event. How can I make certain the event fires before the next page is requested? I've considered event.preventDefault() on the click event of the link, but I actually want the original event to occur, just not immediately.

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  • Google Chrome Extensions: Launch Event (part 5)

    Google Chrome Extensions: Launch Event (part 5) Video Footage from the Google Chrome Extensions launch event on 12/09/09. Xmarks, ebay and Google Translate present their experience developing an extension for Google Chrome. From: GoogleDevelopers Views: 3037 18 ratings Time: 10:30 More in Science & Technology

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  • Free Online Performance Tuning Event

    - by Andrew Kelly
      On June 9th 2010 I will be showing several sessions related to performance tuning for SQL Server and they are the best kind because they are free :).  So mark your calendars. Here is the event info and URL: June 29, 2010 - 10:00 am - 3:00 pm Eastern SQL Server is the platform for business. In this day-long free virtual event, well-known SQL Server performance expert Andrew Kelly will provide you with the tools and knowledge you need to stay on top of three key areas related to peak performance...(read more)

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  • Google Chrome Extensions: Launch Event (part 6)

    Google Chrome Extensions: Launch Event (part 6) Video Footage from the Google Chrome Extensions launch event on 12/09/09. Nick Baum, product manager for Google Chrome's extension system presents the gallery approval process, gives tips to extensions developers on how to make their extension successful and discusses the team's short term plans. From: GoogleDevelopers Views: 5659 17 ratings Time: 08:42 More in Science & Technology

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  • Google Chrome Extensions: Launch Event (part 4)

    Google Chrome Extensions: Launch Event (part 4) Video Footage from the Google Chrome Extensions launch event on 12/09/09. Aaron Boodman and Erik Kay, technical leads for the Google Chrome extensions team discuss the UI surfaces of Google Chrome extensions and the team's content not chrome philosophy. They also highlight the smooth, frictionless install and uninstall process for Google Chrome's extensions system and present the team's initiatives in the space of security and performance. From: GoogleDevelopers Views: 2963 12 ratings Time: 15:44 More in Science & Technology

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  • Google Chrome Extensions: Launch Event (part 2)

    Google Chrome Extensions: Launch Event (part 2) Video Footage from the Google Chrome Extensions launch event on 12/09/09. Aaron Boodman and Erik Kay technical leads for the Google Chrome extensions team present a quick history of the extensions system of Google Chrome and discuss its design principles, focusing on why extensions are webby. From: GoogleDevelopers Views: 3035 12 ratings Time: 05:25 More in Science & Technology

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  • Google Chrome Extensions: Launch Event (part 3)

    Google Chrome Extensions: Launch Event (part 3) Video Footage from the Google Chrome Extensions launch event on 12/09/09. Erik Kay and Aaron Boodman, technical leads for the Google Chrome Extensions team demonstrate how to build, debug and share a Google Chrome extension. From: GoogleDevelopers Views: 2974 13 ratings Time: 08:28 More in Science & Technology

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  • New UK SQL Server community event

    - by GavinPayneUK
    I’m pleased to announce that with the support of VMware I will be holding a new UK SQL Server community event in January 2011. Wednesday January 19th 2011 6.45-9.00pm Free registration required, free parking on-site Registration link here SQL Server in the Evening , hosted at VMware’s UK headquarters in Frimley in Surrey, will cover contemporary technology topics for those using SQL Server in 2011, as well as providing a chance to make and meet with SQL Server community friends. The event will have...(read more)

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  • Google Chrome Extensions: Launch Event (part 2)

    Google Chrome Extensions: Launch Event (part 2) Video Footage from the Google Chrome Extensions launch event on 12/09/09. Aaron Boodman and Erik Kay technical leads for the Google Chrome extensions team present a quick history of the extensions system of Google Chrome and discuss its design principles, focusing on why extensions are webby. From: GoogleDevelopers Views: 3036 12 ratings Time: 05:25 More in Science & Technology

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  • UPK Breakfast Event: "Getting It Done Right" - Independence, Ohio - November 8th

    - by Karen Rihs
    Join us for a UPK “Getting It Done Right” Breakfast Briefing Come for Breakfast. Leave Full of Knowledge. Join Oracle and Synaptis for a breakfast briefing event before you begin your day, and leave full with knowledge on how to reduce risk and increase user productivity. Oracle’s User Productivity Kit (UPK) can provide your organization with a single tool to provide learning and best practices for each area of the business and help ensure you’re “Getting It Done Right.”Learn from Deb Brown, Senior Solutions Consultant, Oracle, as she shows the UPK tool that can save project teams thousands of hours through automation as well as provide greater visibility into application rollouts and business processes. Also hear from a UPK Customer as they share their company’s success with Oracle UPK.  Learn how UPK insures rapid user adoption; significantly lowers development, system testing, and user enablement time and costs; and mitigates project risk. Finally, Pat Tierney, Oracle Practice Director - Synaptis and Jordan Collard, VP Sales - Synaptis, will conclude with an outline of their success as a UPK implementation partner. Register Now Thursday,November 8, 20127:30 a.m. – 10:00 a.m.Embassy Suites Cleveland – Rockside5800 Rockside Woods BoulevardIndependence, OH 44131Directions Agenda 7:30 a.m. Event Arrival / Registration. Breakfast Served. 8:00 a.m. Deb Brown, Senior Solutions Consultant, Oracle Oracle UPK – A Closer Look at Getting It Done, Right. Ensure End User Adoption. 8:40 a.m. UPK Customer Success Story 9:30 a.m. Pat Tierney, Oracle Practice Director - Synaptis and Jordan Collard, VP Sales - Synaptis – Implementation Partner - Using Oracle UPK Before, During and After Application Rollouts 9:50 a.m. Wrap Up   Don’t miss this special Breakfast Briefing and get a jump start on Oracle UPK technology. Please call 1.800.820.5592 ext. 11030 or Click here to RSVP for this exclusive event! Sponsored bySynaptisSynaptis is an Oracle Gold Partner, providing UPK training, implementation, content creation and post go-live support for organizations since 1999.     If you are an employee or official of a government organization, please click here for important ethics information regarding this event.  

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  • Google Chrome Extensions: Launch Event (part 4)

    Google Chrome Extensions: Launch Event (part 4) Video Footage from the Google Chrome Extensions launch event on 12/09/09. Aaron Boodman and Erik Kay, technical leads for the Google Chrome extensions team discuss the UI surfaces of Google Chrome extensions and the team's content not chrome philosophy. They also highlight the smooth, frictionless install and uninstall process for Google Chrome's extensions system and present the team's initiatives in the space of security and performance. From: GoogleDevelopers Views: 2968 12 ratings Time: 15:44 More in Science & Technology

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  • Google Chrome Extensions: Launch Event (part 3)

    Google Chrome Extensions: Launch Event (part 3) Video Footage from the Google Chrome Extensions launch event on 12/09/09. Erik Kay and Aaron Boodman, technical leads for the Google Chrome Extensions team demonstrate how to build, debug and share a Google Chrome extension. From: GoogleDevelopers Views: 2975 13 ratings Time: 08:28 More in Science & Technology

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  • Google Chrome Extensions: Launch Event (part 1)

    Google Chrome Extensions: Launch Event (part 1) Video Footage from the Google Chrome Extensions launch event on 12/09/09. In this part, Brian Rakowski, product management director, provides an update on Google Chrome and explains why extensions are important for the Google Chrome team. From: GoogleDevelopers Views: 5167 17 ratings Time: 04:39 More in Science & Technology

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  • Google Chrome Extensions: Launch Event (part 6)

    Google Chrome Extensions: Launch Event (part 6) Video Footage from the Google Chrome Extensions launch event on 12/09/09. Nick Baum, product manager for Google Chrome's extension system presents the gallery approval process, gives tips to extensions developers on how to make their extension successful and discusses the team's short term plans. From: GoogleDevelopers Views: 5659 17 ratings Time: 08:42 More in Science & Technology

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