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POBox2DWeb - Adding and Removing Body in the world
 

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    <p>I have the following code in Box2D, I want to move my dynamic body to the point where the mouse is click. Also in the future i want to be able to remove the dynamic body, I am not able to find anything equivalent to world.DeleteBody(...). Please Help.</p> <pre><code>var world; var b2Vec2 = Box2D.Common.Math.b2Vec2 , b2BodyDef = Box2D.Dynamics.b2BodyDef , b2Body = Box2D.Dynamics.b2Body , b2FixtureDef = Box2D.Dynamics.b2FixtureDef , b2Fixture = Box2D.Dynamics.b2Fixture , b2World = Box2D.Dynamics.b2World , b2MassData = Box2D.Collision.Shapes.b2MassData , b2PolygonShape = Box2D.Collision.Shapes.b2PolygonShape , b2CircleShape = Box2D.Collision.Shapes.b2CircleShape , b2DebugDraw = Box2D.Dynamics.b2DebugDraw ; var canvas = document.getElementById("canvas"); var context = canvas.getContext("2d"); var mouseX, mouseY, isMouseDown; var bBallBody, bBallbodyDef; function init() { world = new b2World( new b2Vec2(0, 10) //gravity , true //allow sleep ); setupWorld() ; //setup debug draw var debugDraw = new b2DebugDraw(); debugDraw.SetSprite(document.getElementById("canvas").getContext("2d")); debugDraw.SetDrawScale(1.0); debugDraw.SetFillAlpha(0.3); debugDraw.SetLineThickness(1.0); debugDraw.SetFlags(b2DebugDraw.e_shapeBit | b2DebugDraw.e_jointBit); world.SetDebugDraw(debugDraw); window.setInterval(update, 1000 / 60); }; function setupWorld() { setupGround(); addBouncingBall(); } function setupGround() { var fixDef = new b2FixtureDef; fixDef.density = 1.0; fixDef.friction = 0.5; fixDef.restitution = 0.2; var bodyDef = new b2BodyDef; //create ground bodyDef.type = b2Body.b2_staticBody; bodyDef.position.x = 300; bodyDef.position.y = 400; fixDef.shape = new b2PolygonShape; fixDef.shape.SetAsBox(290, 10); world.CreateBody(bodyDef).CreateFixture(fixDef); } function addBouncingBall() { var fixDef = new b2FixtureDef; fixDef.density = 1.0; fixDef.friction = 1.0; fixDef.restitution = 0.1; var bBallbodyDef = new b2BodyDef; bBallbodyDef.type = b2Body.b2_dynamicBody; fixDef.shape = new b2CircleShape(Math.random() + 30); bBallbodyDef.position.x = Math.random() * 300; bBallbodyDef.position.y = Math.random() * 300; bBallBody = world.CreateBody(bBallbodyDef).CreateFixture(fixDef); console.log(bBallBody.m_body.GetPosition().x); }; document.addEventListener("mousedown", handleMouseMove, true); function handleMouseMove(e) { isMouseDown = true; mouseX = e.clientX; mouseY = e.clientY; }; function update() { if(isMouseDown) { for (b = world.GetBodyList() ; b; b = b.GetNext()) { if (b.GetType() == b2Body.b2_dynamicBody) { console.log(b.x, b.y); b.x = 100; b.y = 100; } } isMouseDown = false; } world.Step(1 / 60, 10, 10); world.DrawDebugData(); world.ClearForces(); }; </code></pre> <p>Update:</p> <p>Deletion of an object from the world is done as follows,</p> <ol> <li><p>Create a Timer to Schdule the deletion of the object.</p> <pre><code> window.setInterval(removeObjScheduledForRemoval, 1000/90); </code></pre></li> <li><p>Collect the objects to be deleted in a Array.</p> <pre><code> var bricksScheduledForRemoval = Array(); var index = -1; function removeObjScheduledForRemoval() { for(var i = 0; i &lt;= index; i++){ world.DestroyBody(bricksScheduledForRemoval[i]); bricksScheduledForRemoval[i] = null; } bricksScheduledForRemoval = Array(); index = -1; } </code></pre></li> </ol> <p>The complete code is available here, <a href="http://box2dinabox.blogspot.in/2012/07/the-completed-bananamonkey-game.html" rel="nofollow">http://box2dinabox.blogspot.in/2012/07/the-completed-bananamonkey-game.html</a></p>
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    1. COHey thanks, Box2DWeb seriously lack documentation, Been breaking my head over it. Figured out some of the basic workflows, have blogged about it in http://box2dinabox.blogspot.in/ . hope Someone will find it useful :)
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