QuickBox2D w/ Key Controls

By Zevan | June 15, 2009
CLICK HERE TO COPY
Actionscript:
  1. import com.actionsnippet.qbox.*;
  2. import Box2D.Common.Math.*
  3.  
  4. [SWF(backgroundColor=0xEFEFEF, width=700, height=600, frameRate=60)]
  5.  
  6. var sim:QuickBox2D = new QuickBox2D(this);
  7.  
  8. sim.setDefault({lineColor:0xCC0000, fillColor:0xCC0000});
  9.  
  10. // create compound shape (two circles and a box for the character)
  11. var charParts:Array = [];
  12. // x and y position are now relative to center of compound shape
  13. charParts[0] = sim.addBox({x:0, y:0, width:1, height:2});
  14. charParts[1] = sim.addCircle({x:0, y:-1, radius:0.5});
  15. charParts[2] = sim.addCircle({x:0, y:1, radius:0.5});
  16. var char:QuickObject = sim.addGroup({objects:charParts, x:2, y:2.5, allowSleep:false, angularDamping:0.8, linearDamping:1.5});
  17.  
  18. // vector for linear velocity of character
  19. var charVel:b2Vec2 = new b2Vec2();
  20.  
  21. // angular velocity of character
  22. var charVelAng:Number = 1;
  23. char.body.SetAngularVelocity(charVelAng);
  24.  
  25. // world/platforms
  26. sim.setDefault({lineColor:0x666666, fillColor:0x666666, height:0.5, density:0});
  27. sim.createStageWalls();
  28. sim.addBox({x:3, y:5, width:5});
  29. sim.addBox({x:11, y:5, width:5});
  30. sim.addBox({x:8, y:9, width:8});
  31. sim.addBox({x:4, y:13, width:8});
  32. sim.addCircle({x:16, y:8, radius:2});
  33. sim.addCircle({x:12, y:15, radius:2});
  34.  
  35. // falling circles
  36. sim.setDefault({lineColor:0x2870B5, fillColor:0x2870B5});
  37. for (var i:int = 0; i<15; i++){
  38.     sim.addCircle({x:5 + i, y:2, radius:0.25 ,density:1});
  39. }
  40.  
  41. sim.start();
  42.  
  43. // key controls
  44. addEventListener(Event.ENTER_FRAME, onLoop);
  45. function onLoop(evt:Event):void {
  46.     charVel = char.body.GetLinearVelocity();
  47.     charVelAng =  char.body.GetAngularVelocity();
  48.    
  49.     if (key[Keyboard.RIGHT]){
  50.         charVel.x += 1
  51.         char.body.SetLinearVelocity(charVel);
  52.        
  53.         charVelAng += 1;
  54.         char.body.SetAngularVelocity(charVelAng);
  55.     }
  56.     if (key[Keyboard.LEFT]){
  57.         charVel.x -=1;
  58.         char.body.SetLinearVelocity(charVel);
  59.        
  60.         charVelAng -= 1;
  61.         char.body.SetAngularVelocity(charVelAng);
  62.     }
  63.     if (key[Keyboard.UP]){
  64.          charVel.y = -10;
  65.          char.body.SetLinearVelocity(charVel);
  66.            
  67.          charVelAng *= 0.8;
  68.          char.body.SetAngularVelocity(charVelAng);
  69.     }
  70. }
  71. // basic key setup
  72. var key:Object = new Object();
  73. stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyPressed);
  74. stage.addEventListener(KeyboardEvent.KEY_UP, onKeyReleased);
  75. function onKeyPressed(evt:KeyboardEvent):void {
  76.     key[evt.keyCode] = true;
  77.     key.keyCode = evt.keyCode;
  78. }
  79. function onKeyReleased(evt:KeyboardEvent):void { key[evt.keyCode] = false}

This snippet shows one way to go about doing key controls using QuickBox2D

Take a look at the swf here...

This works with the current version of QuickBox2D.... tomorrow I'll be uploading the new version of QuickBox2D which supports FRIM (frame rate independent motion) and contains a few additional minor tweaks and fixes.

This entry was posted in Box2D, QuickBox2D, keys, motion and tagged , , , . Bookmark the permalink. Post a comment or leave a trackback: Trackback URL.

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  1. By blog.alumican.net » Blog Archive » QuickBox2D正式版v1.0リリース on September 30, 2009 at 8:27 am

    [...] SetLinearVelocityとSetAngularVelocityでオブジェクトに力を与える QuickBox2D w/ Key Controls [...]

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