Flash as3.0教程:弹性小球
来玩儿一个,做一个健身的小弹力球,在地球上有重力哦^^先看看:
下面是实现:
package{
importflash.display.sprite;
importflash.events.event;
importflash.display.stagescalemode;
importflash.display.stage;
publicclasstestballextendssprite{
privatevarball:ball;
privatevarspring:number=0.1;
privatevarvx:number=0;
privatevarvy:number=0;
//这个是摩擦力啦!可以调节一下值看看变化
privatevarfriction:number=0.95;
//这个是重力,和我们现实生活中差不多
privatevargravity:number=5;
publicfunctiontestball(){
this.stage.scalemode=stagescalemode.no_scale;
//实例化一个小球(在库里的哦)
ball=newball();
this.addchild(ball);
this.addeventlistener(event.enter_frame,onenterframe);
}
privatefunctiononenterframe(event:event):void{
//下面是核心算法,好好研究哦
vardx:number=mousex-ball.x;
vardy:number=mousey-ball.y;
varax:number=dx*spring;
varay:number=dy*spring;
vx =ax;
vy =ay;
vy =gravity;
vx*=friction;
vy*=friction;
ball.x =vx;
ball.y =vy;
//绘制线条
this.graphics.clear();
this.graphics.linestyle(1);
this.graphics.moveto(ball.x,ball.y);
this.graphics.lineto(mousex,mousey);
}
}
}
-*-原文地址:http://fck.name/node/138,转载请注明出处,谢谢!-*-