QuickBox2D Unicycler

Actionscript:
  1. import com.actionsnippet.qbox.*;
  2. import Box2D.Common.Math.*;
  3. import Box2D.Dynamics.Joints.*;
  4. [SWF (backgroundColor=0x000000, width=700, height=600, frameRate=60)]
  5. var sim:QuickBox2D = new QuickBox2D(this, {debug:false,gravityY:10, renderJoints:false});
  6. sim.setDefault({fillColor:0xCC0000,lineAlpha:0});
  7. sim.createStageWalls();
  8.  
  9. for (var i:int = 0; i<20; i++){
  10.     sim.addCircle({x:1+i * 0.8, y:1, radius:0.1+Math.random()*0.1, restitution:0.3});
  11. }
  12.  
  13. sim.setDefault({fillColor:0xEFEFEF, fillAlpha:0.5, lineColor:0xFFFFFF, groupIndex:-2});
  14. var ancA:QuickObject = sim.addCircle({x:20, y:12, radius:0.5, density:0, skin:"none"});
  15. var ancB:QuickObject = sim.addCircle({x:20, y:2, radius:0.5, density:0, skin:"none"});
  16. var head:QuickObject = sim.addCircle({x:0, y:-0.6, radius:0.5});
  17. var neck:QuickObject = sim.addBox({x:0, y:1, width:0.5, height:2});
  18. var spindle:QuickObject = sim.addBox({x:0, y:3, width:0.1, height:2})
  19. spindle.userData.visible = false;
  20. var top:QuickObject = sim.addGroup({objects:[head, neck, spindle], x:10, y:5, fixedRotation:true});
  21. var upperLegA:QuickObject = sim.addBox({x:10, y:7.5, width:0.25, height:1.5});
  22. var lowerLegA:QuickObject = sim.addBox({x:10, y:9, width:0.25, height:1.5});
  23. var wheel:QuickObject = sim.addCircle({x:10, y:9, radius:1});
  24. var upperLegB:QuickObject = sim.addBox({x:10, y:7.5, width:0.25, height:1.5});
  25. var lowerLegB:QuickObject = sim.addBox({x:10, y:9, width:0.25, height:1.5});
  26. var upperArmA:QuickObject = sim.addBox({x:10.7, y:5.25, width:1.5, height:0.25});
  27. var lowerArmA:QuickObject = sim.addBox({x:11.8, y:5.25, width:1.2, height:0.25});
  28. var upperArmB:QuickObject = sim.addBox({x:9.5, y:5.25, width:1.5, height:0.25});
  29. var lowerArmB:QuickObject = sim.addBox({x:8.4, y:5.25, width:1.2, height:0.25});
  30. var anchor:b2Vec2 = new b2Vec2();
  31. function connect(a:QuickObject, b:QuickObject, lower:Number, upper:Number, offX:Number=0, offY:Number = 0):QuickObject{
  32.      var min:Number = Math.min(a.y, b.y);
  33.      var max:Number = Math.max(a.y, b.y);
  34.      anchor.y = min + (max - min) * 0.5 + offY;
  35.      min = Math.min(a.x, b.x);
  36.      max = Math.max(a.x, b.x);
  37.      anchor.x = min + (max - min) * 0.5 + offX;
  38.      return sim.addJoint({type:"revolute", a:a.body, b:b.body, x1:anchor.x, y1:anchor.y, lowerAngle:lower, upperAngle:upper});
  39. }
  40. sim.addJoint({type:"revolute", a:wheel.body, b:top.body, x1:wheel.x, y1:wheel.y});
  41. sim.addJoint({type:"revolute", a:lowerLegA.body, b:wheel.body, x1:lowerLegA.x, y1:lowerLegA.y + 0.7});
  42. sim.setDefault({enableLimit:true});
  43. connect(top, upperArmA, 0, 3, -.3, .1);
  44. connect(upperArmA, lowerArmA, -2.5, -1, 0, 0);
  45. connect(top, upperArmB, -3, 0, .3, .1);
  46. connect(upperArmB, lowerArmB, -2.5, -1, 0, 0);
  47. sim.addJoint({type:"distance", a:lowerArmA.body, b:ancA.body, frequencyHz:0.3});
  48. sim.addJoint({type:"distance", a:lowerArmB.body, b:ancB.body, frequencyHz:0.3});
  49. sim.setDefault({enableLimit:true});
  50. connect(top, upperLegA, -6.28, 6, 0, 0.8);
  51. connect(upperLegA, lowerLegA, .1, 6);
  52. wheel.angle = Math.PI;
  53. connect(top, upperLegB, -6.28, 6, 0, 0.8);
  54. connect(upperLegB, lowerLegB, .1, 6);
  55. sim.setDefault({enableLimit:false, type:"revolute"});
  56. sim.addJoint({a:lowerLegB.body, b:wheel.body, x1:lowerLegB.x, y1:lowerLegB.y + 0.7});
  57.  
  58. sim.start();
  59. sim.mouseDrag();
  60.  
  61. var sd:Number = 5, s:Number = 0, t:Number = 0;
  62. addEventListener(Event.ENTER_FRAME, function():void{
  63.     top.angle = Math.cos(t += 0.05) * 0.2;
  64.     if (top.x> 19) sd = -5
  65.     if (top.x <5) sd = 5;
  66.     s += (sd - s) / 8;
  67.     wheel.body.SetAngularVelocity(s);
  68. });

This chunk of code uses QuickBox2D to create a simple looking character riding a unicycle...

Have a look at the swf...

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

8 Comments

  1. alvaro obyrne
    Posted August 19, 2009 at 6:09 am | Permalink

    Hi. Magnificent blog. Congratulations. Thank You.

    Tried to use your timeline_to_doc.php for some of the last QuickBox2D examples and it’s not working. Not a criticism meant but willing to inform.

  2. Posted August 19, 2009 at 7:05 am | Permalink

    Interesting… that makes sense though, all those object definitions are throwing the parser off. I may fix that in the near future.

  3. bob
    Posted August 19, 2009 at 11:26 am | Permalink

    Thanks very much for sharing your work on QuickBox2D project!

    Look forward to trying it out it a project of my own.

  4. Niall
    Posted August 22, 2009 at 5:40 pm | Permalink

    That’s brilliant. Seriously, QuickBox2D is so useful and you can create brilliant stuff with so little code.

    <3 to you sir.

  5. Posted August 22, 2009 at 10:44 pm | Permalink

    @bob & Niall… glad you like it - be sure to let me know if you use QuickBox2D for any interesting projects…

  6. Posted September 2, 2009 at 6:45 am | Permalink

    hi Zevan,

    you don’t post about QuickBox2d since few times (i know, it’s relative),
    so is the library in stand-by ?
    Do you think to integrate contact event soon or i’d better use the Box2DAS3 contact event ‘classic’ method to finish my project for ~15th September ?

    thx you for all you’ve already share !

  7. Posted September 2, 2009 at 1:21 pm | Permalink

    You should be able to use QuickBox2D and have contact event listeners without any issues - if you read about how to do it in the Box2D manual you should be good to go. I haven’t decided exactly what kind of wrapper (if any) I’d like to do for that - but even without a wrapper it’s not too bad… you can loop through all contact points and then check the body properties of each point against the body properties of any QuickObject instance….

    QuickBox2D v1.0 is in the works and will be posted at some point before the end of September….

  8. Posted September 2, 2009 at 1:25 pm | Permalink

    so I’d go with the classic technique … I’ll even post an example of how to do that sometime over the weekend :)

One Trackback

  1. [...] 人体と一輪車の連動サンプル – QuickBox2D Unicycler [...]

Post a Comment

Your email is never published nor shared. Required fields are marked *

*
*