/**
* Copyright ohisama ( http://wonderfl.net/user/ohisama )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/sgGJ
*/
// forked from Redstar's flash on 2009-5-23
package
{
import Box2D.Collision.Shapes.b2CircleDef;
import Box2D.Collision.Shapes.b2PolygonDef;
import Box2D.Collision.b2AABB;
import Box2D.Common.Math.b2Vec2;
import Box2D.Dynamics.b2Body;
import Box2D.Dynamics.b2BodyDef;
import Box2D.Dynamics.b2DebugDraw;
import Box2D.Dynamics.b2World;
import flash.display.MovieClip;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.Event;
[SWF(backgroundColor='#eeeeee', frameRate='3')]
public class Box2DTest2 extends MovieClip
{
private var m_world : b2World;
private var m_physScale : Number = 50;
private var m_timeStep : Number = 1.0 / 30.0;
private var m_iterations : int = 10;
private static const COLORS : Array = [0xee30dd, 0x3069e1, 0x3cb371];
private static const DEGREE120 : Number = 2 / 3 * Math.PI;
private static const DEGREE240 : Number = 4 / 3 * Math.PI;
private static const DELTA_X : Number = 50 + 10 * Math.sqrt(3);
public function Box2DTest2()
{
configStage();
createWorld();
createWall();
createBalls();
addEventListener(Event.ENTER_FRAME, update, false, 0, true);
}
private function configStage() : void
{
stage.scaleMode = StageScaleMode.NO_SCALE;
}
private function createWorld() : void
{
var worldAABB : b2AABB = new b2AABB();
worldAABB.lowerBound.Set(-1000.0, -1000.0);
worldAABB.upperBound.Set(1000.0, 1000.0);
var gravity : b2Vec2 = new b2Vec2(0.0, 0.0);
var doSleep : Boolean = true;
m_world = new b2World(worldAABB, gravity, doSleep);
}
private function createWall() : void
{
var wallSd : b2PolygonDef = new b2PolygonDef();
wallSd.friction = 0.0;
wallSd.restitution = 1.0;
var wallBd : b2BodyDef = new b2BodyDef();
var wallB : b2Body;
wallBd.position.Set(
(50.0 + 10.0 * Math.sqrt(3)) / m_physScale,
(10.0 + 50.0 * Math.sqrt(3)) / m_physScale
);
wallBd.angle = 0;
wallSd.SetAsBox(
(50.0 + 10.0 * Math.sqrt(3)) / m_physScale,
10.0 / m_physScale
);
wallB = m_world.CreateBody(wallBd);
wallB.CreateShape(wallSd);
wallB.SetMassFromShapes();
wallBd.position.Set(
(25.0 + 5.0 * Math.sqrt(3)) / m_physScale,
(-5.0 + 25.0 * Math.sqrt(3)) / m_physScale
);
wallBd.angle = - Math.PI / 3;
wallSd.SetAsBox(
(50.0 + 10.0 * Math.sqrt(3)) / m_physScale,
10.0 / m_physScale
);
wallB = m_world.CreateBody(wallBd);
wallB.CreateShape(wallSd);
wallB.SetMassFromShapes();
wallBd.position.Set(
(75.0 + 15.0 * Math.sqrt(3)) / m_physScale,
(-5.0 + 25.0 * Math.sqrt(3)) / m_physScale
);
wallBd.angle = Math.PI / 3;
wallSd.SetAsBox(
(50.0 + 10.0 * Math.sqrt(3)) / m_physScale,
10.0 / m_physScale
);
wallB = m_world.CreateBody(wallBd);
wallB.CreateShape(wallSd);
wallB.SetMassFromShapes();
}
private function createBalls() : void
{
for (var i : int = 0; i < 35; i++)
{
var bodyDefC : b2BodyDef = new b2BodyDef();
var radius : Number = (Math.random() * 5 + 1) / m_physScale;
var circDef : b2CircleDef = new b2CircleDef();
circDef.density = 1.0;
circDef.radius = radius;
circDef.friction = 0.0;
circDef.restitution = 1.0;
bodyDefC.position.Set((30 + i * 1) / m_physScale, 70 / m_physScale);
bodyDefC.angle = Math.random() * Math.PI;
var body : b2Body = m_world.CreateBody(bodyDefC);
body.CreateShape(circDef);
body.SetMassFromShapes();
var userData : Object = {color: COLORS[(int)(Math.random() * 3)], radius: radius};
body.SetUserData(userData);
var velocity : b2Vec2 = new b2Vec2();
velocity.x = Math.random() * 10 - 5;
velocity.y = Math.random() * 10 - 5;
body.SetLinearVelocity(velocity);
}
}
private function update(e : Event) : void
{
graphics.clear();
m_world.Step(m_timeStep, m_iterations);
for (var body : b2Body = m_world.GetBodyList(); body; body = body.GetNext())
{
if (body.GetUserData())
{
var userData : Object = body.GetUserData();
var x : Number = body.GetPosition().x * m_physScale - DELTA_X;
var y : Number = body.GetPosition().y * m_physScale;
var radius : Number = userData.radius * m_physScale;
var color : uint = userData.color;
drawParticles(x, y, radius, color, stage.stageWidth / 2 - DELTA_X, stage.stageHeight / 2);
}
}
}
private function drawParticles(x : Number, y : Number, radius : Number, color : uint, centerX : Number, centerY : Number) : void
{
graphics.lineStyle(1.0, color, 0.5);
graphics.beginFill(color, 0.8);
graphics.drawCircle(x + centerX + 50 + 10 * Math.sqrt(3), y + centerY, radius);
graphics.endFill();
graphics.lineStyle(1.0, color, 0.5);
graphics.beginFill(color, 0.8);
graphics.drawCircle(x + centerX + 50 + 10 * Math.sqrt(3), - y + centerY, radius);
graphics.endFill();
graphics.lineStyle(1.0, color, 0.5);
graphics.beginFill(color, 0.8);
graphics.drawCircle(
x * Math.cos(DEGREE120) - y * Math.sin(DEGREE120) + centerX + DELTA_X,
x * Math.sin(DEGREE120) + y * Math.cos(DEGREE120) + centerY,
radius
);
graphics.endFill();
graphics.lineStyle(1.0, color, 0.5);
graphics.beginFill(color, 0.8);
graphics.drawCircle(
x * Math.cos(DEGREE120) - y * Math.sin(DEGREE120) + centerX + DELTA_X,
- x * Math.sin(DEGREE120) - y * Math.cos(DEGREE120) + centerY,
radius
);
graphics.endFill();
graphics.lineStyle(1.0, color, 0.5);
graphics.beginFill(color, 0.8);
graphics.drawCircle(
x * Math.cos(DEGREE240) - y * Math.sin(DEGREE240) + centerX + DELTA_X,
x * Math.sin(DEGREE240) + y * Math.cos(DEGREE240) + centerY,
radius
);
graphics.endFill();
graphics.lineStyle(1.0, color, 0.5);
graphics.beginFill(color, 0.8);
graphics.drawCircle(
x * Math.cos(DEGREE240) - y * Math.sin(DEGREE240) + centerX + DELTA_X,
- x * Math.sin(DEGREE240) - y * Math.cos(DEGREE240) + centerY,
radius
);
graphics.endFill();
}
}
}
