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• JMenuBar dropping down to a "custom" JPanel and "erased"

  - by Jani

  The JMenuItems of JMenuBar drops down to a JPanel added to the JFrame, but the JPanel erases the JMenuItems. Do I supposed to pause the re-drawing of the JPanel? I'm using getGraphics() on the JPanel for drawing an image, this method is called from a thread with (for example) 200 ms delay. edit: It's a (very simple) game inside the JPanel. (I've added a field "paused" to the JPanel and i've edited the paint method so it repaints the JPanel only if paused is false, however I don't know if this "solution" is good. (It's set to true when the user clicks on a menu and set to false when selects or cancels it.)

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• Account verification Yelp style, how is it more "secure" than traditional verification?

  - by Chad

  For business owners to "take control" of their business page on Yelp, they register for it. The Yelp system performs a telephone call-back. From watching to the video here, it sounds like a telephone version of what we all typically do - e-mail check. For e-mail check, it basically goes like this: User registers verify e-mail sent they click link inside verify e-mail site verifies Here's Yelp's: User registers verify screen shown with code Yelp calls user user enters code site verifies It's essentially the same thing, via phone. Is there any reason you can see why this method is better than the e-mail method?

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• Canvas context used but not updated on canvas

  - by John Doe

  I am developing an small html5 game, where I have the following code: if(object.blocks){ var blocks = object.blocks, that = this; each(blocks,function(index){ that.blocks.push(new Block(this[index])); }); } I receive an object with some configuration and instantiate blocks with it. It works fine, but the Block class has an method, called draw: this.draw = function (ctx){ if(ctx){ var colors = ['#FF0000','#FFFF00','#0000FF','#00FF00'], color = Math.round(Math.random() * colors.length-1); ctx.fillStyle = colors[color]; ctx.fillRect(this.x,this.y,this.width,this.height); } }; It was working before I moved it into the Block class, but now it draws nothing. This is the code that calls draw: render: function(ctx){ each(this.blocks,function(index){ this[index].draw(ctx); }); } The context comes from the html page, from the main canvas.

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• Sonar default, meet "container state was: CONSTRUCTED"

  - by larry cai

  Environment: hudson/sonar/maven2 in ubuntu locally with default parameters And I got the log from hudson below, I can't figure out where is the problem. [INFO] Sonar host: http://localhost:9000 [INFO] Sonar version: 2.0.1 [INFO] [sonar-core:internal {execution: default-internal}] [INFO] Database dialect class org.sonar.api.database.dialect.Derby [INFO] ------------- Analyzing Game of Life business logic module [INFO] ------------------------------------------------------------------------ [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] Can not execute Sonar Embedded error: Can not analyze the project Cannot stop. Current container state was: CONSTRUCTED [INFO] ------------------------------------------------------------------------ [INFO] Trace org.apache.maven.lifecycle.LifecycleExecutionException: Can not execute Sonar And I notice it also has problem when run it command line without hudson mvn sonar:sonar

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• What are the use cases for closures/callback functions in Javascript?

  - by Christopher Altman

  I was listening to Crockford's talk on Javascript closures and am convinced of the benefit of information hiding, but I do not have a firm understanding of when to use callback functions. It is mostly a true statement that a person could accomplish the same functionality with or without callbacks. As someone who is writing code, what heuristics or cues should I keep in mind when determining when to use callbacks/closures? I am not looking for the blanket statement 'Closures make more secure code', rather a list of practical examples or rules of thumb for when callbacks are the right idea. Crockford's Presentation: http://www.yuiblog.com/blog/2010/04/08/video-crockonjs-5/

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• Java :moving ball with angle ?

  - by Meko

  Hi all.I am started to learn game physics and I am trying to move ball with an angle.But it does not change its angle .Java coordinate sydstem is a little different and i think my problem is there.Here my codes this is for calculating x and y speed scale_X= Math.sin(angle); scale_Y=Math.cos(angle); velosity_X=(speed*scale_X); velosity_Y=(speed*scale_Y); This is for moving ball in run() function ball.posX =ball.posX+(int)velosity_X; ball.posY=ball.posY+(int)velosity_Y; I used (int)velosity_X and (int)velosity_Y because in ball class I draw object g.drawOval(posX, posX, width, height); and here g.drawOval requares int.I dont know is it problem or not. Also if I use angle 30 it goes +X and +Y but if I use angle 35 it goes -X and -Y. I didnot figure out how work coordinate system on java.

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• mysql good way of programing

  - by Syom

  i have the video gallery in my database, which has over 200 000 videos. in my home page in the site i show exactly some videos, which must satisfy to some criteria. and so, what is the question. is it a good way to sort videos every time the home page opene, or i must save the sort results somewhere in the database, and refresh them only if something change. i think it can save me a lot of time. what you think about it. thanks in advance.

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• JSlider jump on mouse click

  - by Aly

  Hi, I have a JSlider which shows bet sizes (for a poker game) I am trying to achieve the effect that when a mouse click occurs the slider jumps forward by a bet amount (i.e. a big blind amount) rather than just incrementing by one. If the mouse click happens to the left of the bar i want it to decrement by a fixed amount else increment. I looked into attaching a mouse listener, but do not know how I can use the event to find out on what side of the bar the mouse was clicked. Any ideas?

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• Navigation bar's buttons tint color sometimes not set

  - by Felipe

  Refer to the following, short video: http://screencast.com/t/cmnsqVTh The problem is with the color of a navigation bar's back button. The first time I load the app, the navigation bar + its buttons have the default color. I then push a view controller on the stack, and when the new view loads (in the viewDidLoad method), it sets the navigation bar's tint color to pink. The nav bar's buttons are also pink as expected. I then press the back button, and the view is popped from the stack. On the root view controller's viewWillAppear method I set the tint color back to nil so that it's the default color again. The navigation bar looks as expected. However if I push the view controller on the stack yet again, the navigation bar's tint color is pink, but the back button's color is the default light blue. Hope that was understandable. So what's the cause of the problem?

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• Most wanted feature for C# 4.0 ?

  - by Romain Verdier

  Some blogs on the Internet give us several clues of what C# 4.0 would be made of. I would like to know what do you really want to see in C# 4.0. Here are some related articles: C# 4 tag on Jon Skeet's blog 4 features for C# 4 What do you want in C# 4 Future Focus - I: Dynamic Lookup .NET 4, C# 4 and the DLR Channel 9 also hosts a very interesting video where Anders Hejlsberg and the C# 4.0 design team talk about the upcoming version of the language. I'm particularly excited about dynamic lookup and AST. I hope we would be able to leverage - at some level - the underlying DLR mechanisms from C#-the-static-language. What about you ?

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• LuaInterface and 64Bit

  - by Skintkingle

  Ok i'm currently using LuaScript v5.1 in a Game engine i'm using. and the handy LuaInterface that comes along with it. i've tested it on a range of systems running a range of OS's. LuaInterface seems to fail on 64bit Operating Systems. Could anyone point me to a 64bit Compiled LuaInterface.dll, or is there any alternative to the LuaInterface that can be used, because LuaInterface is extremely useful and i dont think i would be able to write a more extensive interface by myself using lua51. (I'm not that good, sadly) Any help or links would be greatly appreciated. Thanks alot guys!

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• Visual C# GUI Designer basic tutorial

  - by cusack

  Hi, can you recommend a Visual C# Form Designer tutorial that is targeted at experienced programmers who have at least a basic knowledge of C# but are new to the VS C# Form Designer. At least it shouldn't be targeted at programming newbs, like Introduction to Visual C# 2008 Express Edition (it explains how a comment looks like in C#). So far I've found C# Programming Tutorial - Programming Winforms in C# on stackoverflow. Wishlist: ;-) I'm more interested in focus on the designer itself rather than an explanation of single gui-elements. In other words explaining separation between generated-code, what to not edit manually (visual-c#-designer-responsibility) and on the other hand the parts for which the programmer himself is responsible. So a little more abstract best-practice point of view pointing out some caveats would be great as well. I would prefer text over video as well, but that's minor. /Wishlist Perhaps even a Microsoft reference specific to the Visual c# forms designer (which I seem to have been unable to find) would be helpful.

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• Cannot play local WMV in silverlight MediElement

  - by Nick

  Hello, I am trying to play a video in WMV format in a silverlight MediaElement. <StackPanel> <Grid x:Name="LayoutRoot"> <MediaElement x:Name="media" Source="C:\Bounce.wmv" Width="300" Height="300" AutoPlay="True" /> </Grid> </StackPanel> This does nothiing.. but if I change the source attribute to point to some WMV out on the web it works. What am I doing wrong? Thanks, Nick

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• options for producing audio with GWT

  - by Kaffeine Coma

  What options are there for producing audio in a GWT app? I'm thinking of making a simple game, but I'm disappointed to see that there's still not much progress on audio support directly in GWT (yes, I realize that's largely due to lack of underlying browser support; looking forward to HTML5!) This blog post says that "audio support in GWT is rapidly evolving", yet I don't see updates in over a year, at least not at that site. It seems these are the available options: GWT Voices GWT SoundManager GWT Sound GWT Incubator I believe most of these (all of them?) rely on Flash to produce audio. I'm most inclined to go with the GWT Incubator, as that's where features slated for inclusion in GWT get started, but I've no real recommendations to go on. I would appreciate hearing about your experiences with any of these libraries, thanks.

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• Statistical approach to chess?

  - by Chinmay Kanchi

  Reading about how Google solves the translation problem got me thinking. Would it be possible to build a strong chess engine by analysing several million games and determining the best possible move based largely (completely?) on statistics? There are several such chess databases (this is one that has 4.5 million games), and one could potentially weight moves in identical (or mirrored or reflected) positions using factors such as the ratings of the players involved, how old the game is (to factor in improvements in chess theory) etc. Any reasons why this wouldn't be a feasible approach to building a chess engine?

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• Performance of DrawingVisual vs Canvas.OnRender for lots of constantly changing shapes

  - by romkyns

  I'm working on a game-like app which has up to a thousand shapes (ellipses and lines) that constantly change at 60fps. Having read an excellent article on rendering many moving shapes, I implemented this using a custom Canvas descendant that overrides OnRender to do the drawing via a DrawingContext. The performance is quite reasonable, although the CPU usage stays high. However, the article suggests that the most efficient approach for constantly moving shapes is to use lots of DrawingVisual instances instead of OnRender. Unfortunately though it doesn't explain why that should be faster for this scenario. Changing the implementation in this way is not a small effort, so I'd like to understand the reasons and whether they are applicable to me before deciding to make the switch. Why could the DrawingVisual approach result in lower CPU usage than the OnRender approach in this scenario?

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• how to preload more than one but not all images of a slideshow with jquery

  - by wtip

  I'd like to create a web based stop motion video player. Basically a slideshow that shows 2-4 images per second. Each image might be a maximum of 20KB. I don't want to preload all images in the slideshow as there might be thousands, however I need to preload more than just the next image in the show as this will not playback fast enough (because of the playback speed the browser needs to be loading more than one image at a time). I've been looking at using the jQuery Cycle Plugin (http://malsup.com/jquery/cycle/) with a addSlide type function but don't know how to make it work. Would something like this might work? -Slideshow starts -image is played back -preloader will attempt to load up to the next 60 images -playback will wait for the next image in line to completely load, but will not wait for all 59 others. The playback / preloading order is important for this application.

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• C++ project type: unicode vs multi-byte; pros and cons

  - by Stefan Valianu

  I'm wondering what the Stack Overflow community thinks when it comes to creating a project (thinking primarily c++ here) with a unicode or a multi-byte character set. Are there pros to going Unicode straight from the start, implying all your strings will be in wide format? Are there performance issues / larger memory requirements because of a standard use of a larger character? Is there an advantage to this method? Do some processor architectures handle wide characters better? Are there any reasons to make your project Unicode if you don't plan on supporting additional languages? What reasons would one have for creating a project with a multi-byte character set? How do all of the factors above collide in a high performance environment (such as a modern video game) ?

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• jabber based server and client application in cocoa

  - by Miraaj

  Hi all, I have implemented an application which supports text chat. Now I want to implement voice chat and later video chat in it, but I have less time provided by client :( So I am planning to go for some open source code in cocoa, which I can use and easily in-corporate in my application. After analysis over net I found that Jabber related client/ chat server application should be best according to my requirements. I have found that there are several jabber based client-server application but mostly written in java, C or C++. Can anyone suggest me some links or code for cocoa based, jabber server and client application?? Also I want to ask that lets say I got server application in C and client application in cocoa, then will I be able to transmit text, multimedia messages between client nodes?? Thanks, Miraaj

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• Horrible WPF performance!

  - by Erik

  Why am i using over 80% CPU when just hovering some links? As you can see in the video i uploaded: http://www.youtube.com/watch?v=3ALF9NquTRE the CPU goes to 80% CPU when i move my mouse over the links. My style for the items are as follows <Style x:Key="LinkStyle" TargetType="{x:Type Hyperlink}"> <Style.Triggers> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="Foreground" Value="White" /> </Trigger> </Style.Triggers> <Setter Property="TextBlock.TextDecorations" Value="{x:Null}" /> <Setter Property="Foreground" Value="#FFDDDDDD"/> <Setter Property="Cursor" Value="Arrow" /> </Style> Why?

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• tetris rotation

  - by Samuel

  Hey, For university we're supposed to write a game (the language is modula2 little chance you know it). Each tetromino is defined through a central piece and 3 relative pieces, Now when it comes to rotation i just rotate the relative blocks (linear algebra). What i am asking myself is how to handle the rotations a user does when the piece has already "landed" because than the user has a little time left to move his pieve quickly into the desired position but in tetris versions all over the web you can "rotate over" other pieces, but i dont seem to get it with my rotation. Over what piece do i need to rotate? are there guidelines? Thanks

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• Error in java code.

  - by user243680

  I am getting the following error when i try to use a blue tooth dongle to transfer a video file from pc to mobile phone. does anyone know run: BlueCove log redirected to log4j log4j:WARN No appenders could be found for logger (com.intel.bluetooth). log4j:WARN Please initialize the log4j system properly. BlueCove version 2.1.0 on bluesoleil java.io.IOException: Device not discovered BlueCove stack shutdown completed at com.intel.bluetooth.BluetoothStackBlueSoleil.connectionRfOpenClientConnection(BluetoothStackBlueSoleil.java:361) at com.intel.bluetooth.BluetoothRFCommClientConnection.<init>(BluetoothRFCommClientConnection.java:37) at com.intel.bluetooth.MicroeditionConnector.openImpl(MicroeditionConnector.java:379) at com.intel.bluetooth.MicroeditionConnector.open(MicroeditionConnector.java:162) at javax.microedition.io.Connector.open(Connector.java:83) at de.avetana.obexsolo.OBEXConnector.open(OBEXConnector.java:103) at OBEXTest.main(OBEXTest.java:23)

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• What should I use for the filepath if I'm developing from my desktop?

  - by codeninja

  I'm having an extremely difficulty time getting the flowplayer to show up and the worst part is I have no idea what is wrong because I'm not getting any error messages! I have an external javascript file: C:/desktop/mysite/js/jq/plugins.js calling $f() from: C:/desktop/mysite/thirdparty/flowplayer/flowplayer.js the swf files also live there... I'm working on file/desktop (no localhost or webserver) $(video.id).flowplayer("thirdparty/flowplayer/flowplayer-3.1.15.swf", { clip:{ .... }, // min Flash version version:[9,115], // older versions will see a custom message onFail:function(){ alert("Failed!"); }, onError:function(errCode,errMsg){ alert(errCode+errMsg); } }); I don't know what path to use for the SWFs to get them to load, is the path relative to the javascript (plugins.js) that calls $f() or is it relative to the path of the flowplayer.js ?? bangs head on wall

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• Display vimeo in fancybox , trouble in IE

  - by Alexander Corotchi

  Hi all, i have a problem with VIMEO video . I want to display it in fancybox : this is HTML : <a href="#content" class="zoom">test</a> <div id="content" style="display:none;"> <object width="504" height="280" data="http://vimeo.com/moogaloop.swf" type="application/x-shockwave-flash"> <param value="always" name="allowscriptaccess"><param value="true" name="allowfullscreen"> <param value="http://vimeo.com/moogaloop.swf" name="movie"> <param value="clip_id=6999704&amp;server=vimeo.com&amp;fullscreen=1&amp;show_title=1&amp;show_byline=1&amp;show_portrait=1&amp;color=00ADEF" name="flashvars"> </object> </div> and js: $(document).ready(function() { $("a.zoom").fancybox(); }); Can somebody help me with this , maybe somebody knows hot to fix it .. Thanks !!

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• JRuby Slick CanvasGameContainer using too much heap memory

  - by Jwosty

  I'm using Java's Slick library (great, by the way) just fine from JRuby. To start a game, I use AppGameContainer which works completely fine and as expected, but if I try to use CanvasGameContainer instead (I want a resizable window and Slick uses an old version of LWJGL that doesn't support this directly) it throws this error: Fri Jun 01 10:22:07 MDT 2012 INFO:Slick Build #274 Error: Your application used more stack memory than the safety cap of 2048K. Specify -J-Xss####k to increase it (#### = cap size in KB). Specify -w for full StackOverflowError stack trace I've tried increasing the heap size until my computer can't allocate any more memory, but to no avail. The CanvasGameContainer uses an awt window to display, which is resizable. Any ideas on why this is happening and/or how to fix this?

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