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刚刚接触这个引擎的时候，感觉很强大，在一些演示方面已经有不错的表现。只是这些都是外国一些类库，相对来讲，英语说明还是让人看得很头疼。的确很多时候，不了解整个架构的时候，只可以一点点摸索，一点点记录下来吧。
看看这个类包：com.fileitup.fisixengine.particles
在文档api里面有四种大概的粒子，按字面意思圆形粒子，导航粒子（应该不太准备），方形粒子，还有一个还是转动粒子
圆形粒子：有坐标轴，中心线的动态圆
导航粒子：用于连接刚体物体
方形粒子; 处理多边形
转动粒子：跟圆形粒子差不多，但它能转动，
尝试一下创建一个简单的粒子：当我们打开这些包的时候，正是要去试试有什么效果，大概会知道这些是什么意思。毕竟外语很难把握就得去试试。
按习惯，我们先看看第一种粒子：CircleParticle
1.它的构造函数
CircleParticle(x:Number, y:Number, rad:Number)
Creates an instance of a CircleParticle
创建一个独立的圆形粒子
它有很多的方法，我们尝试一些简单的看看试试能不能发生事情。
首先导入我们想要的包
import com.fileitup.fisixengine.core.FisixEngine;
import com.fileitup.fisixengine.particles.CircleParticle;
使用flex来创建一个as 工程。名为Example
- package
- {
- import com.fileitup.fisixengine.core.FisixEngine;
- import com.fileitup.fisixengine.particles.CircleParticle;
- import flash.display.MovieClip;
- /**In this example, a jello-type object is created and manipulated by the mouse
- */
- [SWF(width='700',height='500',backgroundColor='0x50464b',frameRate='30')]
- public class Example extends MovieClip{
- private var myEngine:FisixEngine
- public function Example (){
- myEngine = new FisixEngine()
- myEngine.setGravity(0,1)
- var circle:CircleParticle=myEngine.newCircleParticle(300,30,30);
- //circle.bounce=0.7;
- myEngine.setRender(true);
- //tell the engine where to render to
- myEngine.setRenderGraphics(graphics)
- myEngine.startEngine(30);
- }
- }
- }
程序入口：
myEngine = new FisixEngine()//创建一个物理引擎，
myEngine.setGravity(0,1)//指定他的重力
2.创建一个圆：
var circle:CircleParticle=myEngine.newCircleParticle(300,30,30); //这一句，我猜想是为这个物理引擎创建一个单独的圆，半径为30，坐标（300，30）。
接下来，启动引擎，渲染物体，设置引擎的帧速度
myEngine.setRender(true);
myEngine.setRenderGraphics(graphics)
myEngine.startEngine(30);
一个简单的圆似乎已经完成了。看看效果如何:为了显示方便，我将半径放大
在我看来，能弄出这个圆是一件很让人值得高兴的事情，因为我探索之路正在开始了。后面还会更加精彩：
还可以设置碰撞墙，弹力等效果。
- package
- {
- import com.fileitup.fisixengine.core.FisixEngine;
- import com.fileitup.fisixengine.particles.CircleParticle;
- import com.fileitup.fisixengine.utils.BoundingBox;
- import flash.display.MovieClip;
- /**In this example, a jello-type object is created and manipulated by the mouse
- */
- [SWF(width='700',height='500',backgroundColor='0x50464b',frameRate='30')]
- public class Example2 extends MovieClip{
- private var myEngine:FisixEngine
- public function Example2 (){
- myEngine = new FisixEngine()
- myEngine.setGravity(0,1)
- myEngine.setBounds(new BoundingBox(0,0,700,500));
- myEngine.boundsCollisions=true;
- var circle:CircleParticle=myEngine.newCircleParticle(300,30,30);
- circle.bounce=0.7;
- myEngine.setRender(true);
- //tell the engine where to render to
- myEngine.setRenderGraphics(graphics)
- myEngine.startEngine(30);
- }
- }
- }
再进化一下：可以弄出下面的效果
- package
- {
- import com.fileitup.fisixengine.constraints.SpringConstraint;
- import com.fileitup.fisixengine.core.FisixEngine;
- import com.fileitup.fisixengine.core.FisixObject;
- import com.fileitup.fisixengine.utils.BoundingBox;
- import flash.display.Bitmap;
- import flash.display.MovieClip;
- import flash.events.Event;
- import flash.text.TextField;
- /**In this example, a jello-type object is created and manipulated by the mouse
- */
- [SWF(width='700',height='500',backgroundColor='0x50464b',frameRate='30')]
- [Embed (source="1.jpg")]
- public class Example2 extends MovieClip{
- private var myEngine:FisixEngine
- private var txtFPS:TextField
- public function Example2 (){
- //first, create an instance of the fisixengine object
- myEngine = new FisixEngine()
- //bound all of the objects in the simulation within a box
- myEngine.setBounds(new BoundingBox(0,0,700,500))
- //enable collisions with the bounding box
- myEngine.boundsCollisions=true
- //set the gravity to pull down at a rate of 1 pixel per second
- myEngine.setGravity(0,1)
- //create a jello cube
- var jello:FisixObject = myEngine.newFisixObject();
- for(var i:uint=0;i<12;i++)
- jello.newCircleParticle(250+100*Math.cos(i*30),200+100*Math.sin(i*30),20);
- SpringConstraint.constraintAll(jello,jello.particles,.9);
- //attach the corner of the jello to the mouse
- myEngine.newMouseAttacher(jello.particles[0],root,3)
- //turn on primitive rendering
- myEngine.setRender(true);
- //tell the engine where to render to
- myEngine.setRenderGraphics(graphics)
- addEventListener(Event.ENTER_FRAME,onEnterFrame)
- txtFPS = new TextField()
- addChild(txtFPS)
- }
- private function onEnterFrame(e:Event):void{
- myEngine.mainLoop(1)
- txtFPS.text = int(myEngine.getRealFPS()).toString()
- }
- }
- }
演示效果：http://files.cnblogs.com/hero82748274/Example.swf
二、类关系：
| Package | com.fileitup.fisixengine.particles |
| Class | public class CircleParticle |
| Inheritance | CircleParticle --> Particle --> CollisionObject |
| Subclasses | CircleParticleConveyor, Projectile, WheelParticle |
可以看出CircleParticle的类，继承了Particle，而Partilce 继承了 CollisionObject
CollisionObject 就是相当于它们的基类，从而实现了解这种层级关系。为我们实现打下一些基础
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