// forked from h_jayesh's boxed4.5 // forked from h_jayesh's boxed4 // forked from h_jayesh's forked from: forked from: boxed2 // forked from h_jayesh's forked from: boxed2 // forked from h_jayesh's boxed2 // forked from h_jayesh's forked from: boxed1 // forked from h_jayesh's boxed1 // forked from hjayesh's box2dtest1 //well test seems to work. //drag and draw boxes // I really like this //grabbed from here http://gamersgarden.com/2008/12/box2d-example-source/ --- as is including all the warnings. //im certain this stuff could be the basis for some nice stuff package { import flash.display.Sprite; import flash.events.Event; import flash.events.MouseEvent; import Box2D.Dynamics.*; import Box2D.Collision.*; import Box2D.Collision.Shapes.*; import Box2D.Common.Math.*; public class Main extends Sprite { public var m_dbgSprite; public var m_world:b2World; public var m_phys_scale:Number = 30.0; public var m_timestep:Number = 1.0/30.0; public var m_iterations:Number = 25.0; //initial box coordinates when we first press mouse down public var initX:Number = 0.0; public var initY:Number = 0.0; public var drawing:Boolean = false; public function Main () { /* A Box2D world needs three parameters: a b2AABB, gravity and a Booleand deciding whether or not to let bodies sleep when they are not being simulated. This saves CPU so should always be left on :) */ var worldAABB:b2AABB = new b2AABB(); worldAABB.lowerBound.Set (-1000,-1000); worldAABB.upperBound.Set (1000,1000); var gravity:b2Vec2 = new b2Vec2(-0.4,0.98); m_world = new b2World(worldAABB,gravity,true); //Setup Debug Draw - So that Box2D draws the shapes for us m_dbgSprite = new Sprite(); addChild (m_dbgSprite); SetDebugDraw (); //Add Our Ground AddStaticBox (300/m_phys_scale,440/m_phys_scale,300/m_phys_scale,50/m_phys_scale); AddStaticBox (200/m_phys_scale,340/m_phys_scale,50/m_phys_scale,50/m_phys_scale); var boxDef:b2CircleDef = new b2CircleDef(); boxDef.radius = 2 boxDef.friction = 0.3 boxDef.density = 1; // define our body var bodyDef:b2BodyDef = new b2BodyDef(); bodyDef.linearDamping = 10 bodyDef.position.Set(9, 10) // Add our body to the world var myBody:b2Body = m_world.CreateBody(bodyDef); myBody.CreateShape(boxDef); myBody.SetMassFromShapes(); addEventListener (Event.ENTER_FRAME,Update); stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed_handler); stage.addEventListener (MouseEvent.MOUSE_DOWN,mousePressed); stage.addEventListener (MouseEvent.MOUSE_MOVE,mouseMoved); stage.addEventListener (MouseEvent.MOUSE_UP,mouseReleased); } public function mousePressed (e:MouseEvent) { //Store initial X and Y position initX = e.localX; initY = e.localY; drawing = true; } public function mouseMoved (e:MouseEvent) { if (drawing) { //Simply draw the "ghost" of the box we are about to add graphics.clear (); graphics.beginFill (0xFF0000,0.5); graphics.drawRect (initX,initY,e.localX-initX,e.localY-initY); } } public function mouseReleased (e:MouseEvent) { graphics.clear (); drawing = false; //Coordinates of bottom-right of box (when drawing from left to right) var finalX:Number = e.localX; var finalY:Number = e.localY; //Correct if drawing from right to left if (finalX < initX) { //If so, swap initX and finalX var tempX:Number = initX; initX = finalX; finalX = tempX; } if (finalY < initY) { //If so, swap initY and finalY var tempY:Number = initY; initY = finalY; finalY = tempY; } //Work out the half-width and height of the box var boxHalfWidth:Number = Math.abs((finalX-initX)/2); var boxHalfHeight:Number = Math.abs((finalY-initY)/2); if (boxHalfWidth > 0 && boxHalfHeight > 0) { for (var z:Number = 0; z < 5; z++) { AddBox ((finalX-boxHalfWidth)/m_phys_scale+(z*0.02),(finalY-boxHalfHeight)/m_phys_scale+(z*0.2),boxHalfWidth/m_phys_scale+(z*0.02),boxHalfHeight/m_phys_scale+(z*0.2)); } } } /* NOTE: AddBox takes the _x,_y and halfwidth and halfheight parameters in METRES not PIXELS. This means when you call this function, always DIVIDE a pixel size by m_phys_scale to get it in meteres. */ public function AddBox (_x:Number,_y:Number,_halfwidth:Number,_halfheight:Number) { var bodyDef:b2BodyDef = new b2BodyDef(); bodyDef.position.Set (_x,_y); var boxDef:b2PolygonDef = new b2PolygonDef(); boxDef.SetAsBox (_halfwidth,_halfheight); boxDef.density = 0.9; boxDef.friction = 0.4; boxDef.restitution = .8; var body:b2Body = m_world.CreateBody(bodyDef); body.CreateShape (boxDef); body.SetMassFromShapes (); } public function AddStaticBox (_x:Number,_y:Number,_halfwidth:Number,_halfheight:Number) { var bodyDef:b2BodyDef = new b2BodyDef(); bodyDef.position.Set (_x,_y); var boxDef:b2PolygonDef = new b2PolygonDef(); boxDef.SetAsBox (_halfwidth,_halfheight); boxDef.density = 0.0; var body:b2Body = m_world.CreateBody(bodyDef); body.CreateShape (boxDef); body.SetMassFromShapes (); } public function Update (e:Event) { if ((Math.random()*10)==5) { for (var z:Number = 0; z < 5; z++) { AddBox (Math.random()*100/m_phys_scale+(z*0.02),Math.random()*100/m_phys_scale+(z*0.2),Math.random()*100/m_phys_scale+(z*0.02),Math.random()*100/m_phys_scale+(z*0.2)); } } //We need to do this to simulate physics m_world.Step (m_timestep,m_iterations); } public function SetDebugDraw () { //Set Debug Draw (hidden here to reserve space in constructor.) var dbgDraw:b2DebugDraw = new b2DebugDraw(); dbgDraw.m_sprite = m_dbgSprite; dbgDraw.m_drawScale = m_phys_scale; dbgDraw.m_fillAlpha = 0.8; dbgDraw.m_lineThickness = 2.0; dbgDraw.m_drawFlags = 0x0001 | 0x0002; m_world.SetDebugDraw (dbgDraw); } } }