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
// 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);
addEventListener (Event.ENTER_FRAME,Update);
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 = 0.05;
boxDef.friction = 0.04;
boxDef.restitution = 2.8;
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);
}
}
}