pendulum
...
@author Jacky Riawan
/**
* Copyright Jacky.Riawan ( http://wonderfl.net/user/Jacky.Riawan )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/yIfM
*/
package
{
import Box2D.Collision.b2AABB;
import Box2D.Collision.Shapes.b2CircleDef;
import Box2D.Collision.Shapes.b2PolygonDef;
import Box2D.Common.Math.b2Vec2;
import Box2D.Dynamics.b2Body;
import Box2D.Dynamics.b2BodyDef;
import Box2D.Dynamics.b2DebugDraw;
import Box2D.Dynamics.b2World;
import Box2D.Dynamics.Joints.b2DistanceJoint;
import Box2D.Dynamics.Joints.b2DistanceJointDef;
import flash.display.Sprite;
import flash.events.Event;
/**
* ...
* @author Jacky Riawan
*/
public class main extends Sprite
{
private const ratio:uint=30
private var world:b2World;
public function main() {
setupWorld()
setupDebugDraw()
addPendulum(100, 100, true)
for (var i:int = 0; i < 25;i++){
addPendulum(111+i*11, 100)
}
addPendulum(375, 250, true,1)
for (i = 0; i < 25;i++){
addPendulum(100+i*11, 250)
}
addEventListener(Event.ENTER_FRAME, update)
}
private function update(e:Event):void
{
world.Step(1/20,10)
}
private function addPendulum(posx:int,posy:int,first:Boolean=false,isLeft:int=-1):void
{
var shiftx:int
var shifty:int
if (first) {
shiftx = 50*isLeft
shifty = 0
}else {
shiftx = 0
shifty = 50
}
var anchorBD:b2PolygonDef = new b2PolygonDef()
anchorBD.SetAsBox(4 / ratio, 4 / ratio)
var anchorB:b2BodyDef = new b2BodyDef()
anchorB.position.Set(posx / ratio, posy / ratio)
var anchor:b2Body = world.CreateBody(anchorB)
anchor.CreateShape(anchorBD)
anchor.SetMassFromShapes()
//
var ballShape:b2CircleDef = new b2CircleDef()
ballShape.radius = 5 / ratio
ballShape.density = 100
ballShape.friction = 0
ballShape.restitution = 1
var ballBD:b2BodyDef = new b2BodyDef()
ballBD.position.Set((posx+shiftx) / ratio, (posy+shifty) / ratio)
var ball:b2Body = world.CreateBody(ballBD)
ball.SetBullet(true)
ball.CreateShape(ballShape)
ball.SetMassFromShapes()
//
var jointDef:b2DistanceJointDef = new b2DistanceJointDef()
jointDef.Initialize(anchor, ball, anchor.GetPosition(), ball.GetPosition())
jointDef.dampingRatio = 1
jointDef.frequencyHz=100
var joint:b2DistanceJoint=world.CreateJoint(jointDef) as b2DistanceJoint
}
private function setupDebugDraw():void
{
var sprite:Sprite = new Sprite()
addChild(sprite)
var debugDraw:b2DebugDraw = new b2DebugDraw()
debugDraw.m_drawScale = ratio
debugDraw.m_sprite = sprite
debugDraw.SetFlags(b2DebugDraw.e_jointBit|b2DebugDraw.e_shapeBit)
world.SetDebugDraw(debugDraw)
}
private function setupWorld():void
{
var AABB:b2AABB = new b2AABB()
AABB.upperBound.Set( 1000 / ratio, 1000 / ratio)
AABB.lowerBound.Set(-1000 / ratio, -1000 / ratio)
world = new b2World(AABB, new b2Vec2(0, 15), false)
}
}
}