初识AS3：两点间距离

作者佚名技术来源服务器技术浏览发布时间 2012-07-07

[效果]

[代码] //画两小圆
varyuan1:Sprite=newSprite();
yuan1.graphics.beginFill(0x000000);
yuan1.graphics.drawCircle(0,0,5);
addChild(yuan1);
yuan1.x=100;
yuan1.y=100;
varyuan2:Sprite=newSprite();
yuan2.graphics.beginFill(0x000000);
yuan2.graphics.drawCircle(0,0,5);
addChild(yuan2);
yuan2.x=130;
yuan2.y=140;
//显赫距离的动态文本
var_txt:TextField=newTextField();
_txt.autoSize=TextFieldAutoSize.LEFT;
addChild(_txt);
//定义直线精灵
varzhixian:Sprite=newSprite();
addChild(zhixian);
//圆1拖动和停止拖动
yuan1.buttonMode=true;
yuan1.addEventListener(MouseEvent.MOUSE_DOWN,yuan1ax);
functionyuan1ax(event:MouseEvent):void{
yuan1.startDrag();
}
yuan1.addEventListener(MouseEvent.MOUSE_MOVE,yuan1yd);
functionyuan1yd(event:MouseEvent):void{
event:gx;
}
yuan1.addEventListener(MouseEvent.MOUSE_UP,yuan1sk);
functionyuan1sk(event:MouseEvent):void{
yuan1.stopDrag();
}
stage.addEventListener(MouseEvent.MOUSE_UP,yuan1yc);
functionyuan1yc(event:MouseEvent):void{
yuan1.stopDrag();
}
//圆2拖动和停止拖动
yuan2.buttonMode=true;
yuan2.addEventListener(MouseEvent.MOUSE_DOWN,yuan2ax);
functionyuan2ax(event:MouseEvent):void{
yuan2.startDrag();
}
yuan2.addEventListener(MouseEvent.MOUSE_MOVE,yuan2yd);
functionyuan2yd(event:MouseEvent):void{
event:gx;
}
yuan2.addEventListener(MouseEvent.MOUSE_UP,yuan2sk);
functionyuan2sk(event:MouseEvent):void{
yuan2.stopDrag();
}
stage.addEventListener(MouseEvent.MOUSE_UP,yuan2yc);
functionyuan2yc(event:MouseEvent):void{
yuan2.stopDrag();
}
//更新
stage.addEventListener(Event.ENTER_FRAME,gx);
functiongx(event:Event):void{
zhixian.graphics.clear();
varzuobiao1oint=newPoint(yuan1.x,yuan1.y);
varzuobiao2oint=newPoint(yuan2.x,yuan2.y);
varjuli:Number=Point.distance(zuobiao1,zuobiao2);
zhixian.graphics.lineStyle(2,0xFF0000,1);
zhixian.graphics.moveTo(yuan1.x,yuan1.y);
zhixian.graphics.lineTo(yuan2.x,yuan2.y);
_txt.text="两点间距离："+uint(juli*10)/10;
} 关键词：间距

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