今天研究了一下两个movieclip图形的碰撞，心得如下：
1.将两个要进行碰撞的movieclip存入两个bitmapdata中，使用bitmapdata.draw方法来分别获取这两个movieclip的图形信息，注意先用getRect获取可见图形的矩形区域，然后用matrix(1,0,0,1,-getRect.left,-getRect.top)来获取完整的图像信息
2.使用bitmapdata.hittest时的point一定要写对，要放到同一坐标系下进行比对
【关于两个不规则图形的碰撞检测】具体的程序结构如下
a. 名为hittest.fla文件中建两个mc,名称分别为star和base(star包含base，star的作用在于获取bitmapdata，而base的作用在于旋转)，star绑定类star，base的mc中画一个不规则图形
b. hittest.fla文档绑定类hittest
c. hittest.as的内容
package{
import flash.display.MovieClip;
import flash.utils.Timer;
import flash.events.TimerEvent;
import flash.display.Bitmap;
import flash.geom.Rectangle;
import flash.utils.ByteArray;
import flash.display.BitmapData;
import flash.geom.Point;
public class hittest extends MovieClip {
private var setTimer:Timer;
private var star1:star;
private var star2:star;
public function hittest() {
// constructor code
star1 = new star(50);
star1.name = "star1";
star1.x = 150;
star1.y = 200;
addChild(star1);
star2 = new star(100);
star2.name = "star2";
star2.x = 310;
star2.y = 160;
addChild(star2);
setTimer = new Timer(50);
setTimer.addEventListener(TimerEvent.TIMER, this.hitcheck);
setTimer.start();
}
private function hitcheck(ent:TimerEvent) {
if(star1.bitmap == null || star2.bitmap == null) {
return;
}
else {
var star1point:Point = new Point();
var star1rect:Rectangle = star1.getRect(star1);
star1point.x = star1.x + star1rect.x;
star1point.y = star1.y + star1rect.y;
var star2point:Point = new Point();
var star2rect:Rectangle = star2.getRect(star2);
star2point.x = star2.x + star2rect.x;
star2point.y = star2.y + star2rect.y;
if(star1.bitmap.hitTest(star1point,1,star2.bitmap,star2point,1))
{
setTimer.stop();
star1.setTimer.stop();
star2.setTimer.stop();
}
}
}
}
}
d. star.as的内容
package{
import flash.display.MovieClip;
import flash.utils.Timer;
import flash.events.TimerEvent;
import flash.display.BitmapData;
import flash.geom.Rectangle;
import flash.geom.Matrix;
public class star extends MovieClip {
public var setTimer:Timer;
public var bitmap:BitmapData;
public function star(internum:int) {
// constructor code
setTimer = new Timer(internum);
setTimer.addEventListener(TimerEvent.TIMER, this.movenow);
setTimer.start();
}
private function movenow(ent:TimerEvent) {
//碰撞检测
var maprect:Rectangle = this.getRect(this);
bitmap = new BitmapData(maprect.width, maprect.height, true, 0);
bitmap.draw(this, new Matrix(1, 0, 0, 1, -maprect.left, -maprect.top));
this["base"].rotation++;
}
}
}
