让子弹飞,图片缓冲应用
今天看到同学讲到图片缓冲的应用,原文(http://bbs.9ria.com/thread-61328-1-2.html)
看了下代码,发现还有改进的余地,特地自己实现了一把
改进的地方:改进beginBitmapFill为位图,这个比较耗,用vector代替arrary
不再传递buffer及位图,数据和具体显示分离
简化了部分代码
下面是具体效果
运动物品类
package { /** * 运动物品类 * @author heycup@gmail.com */ public class MoveObject { public var x:int; public var y:int; public var sx:int; public var sy:int; public function update():void { x += sx; y += sy; if (x > BitmapBufferTest.w || x < 0){ sx = -sx; } if (y > BitmapBufferTest.h || y < 0){ sy = -sy; } } } }
场景类
package { import flash.display.Bitmap; import flash.display.BitmapData; import flash.display.Sprite; import flash.events.Event; import flash.geom.Point; /** * ... * @author heycup@gmail.com */ public class BitmapBufferTest extends Sprite { public static var w:int = 600; public static var h:int = 400; private var objects:Vector.<MoveObject> = new Vector.<MoveObject>(); private var maxNum:uint = 5000; private var bmd:BitmapData; //嵌入子弹图片 [Embed(source='../bin/zhidan.png')] private var ZhiDan:Class; private var zhidanBmd:BitmapData; public function BitmapBufferTest(){ init(); } private function init():void { //获取子弹的bitmapdata var zhidan:Bitmap = new ZhiDan(); zhidanBmd = zhidan.bitmapData; //实例buffer bmd = new BitmapData(w, h, false, 0x000000); var bitmap:Bitmap = new Bitmap(bmd); addChild(bitmap); //实例大量子弹运动类 for (var i:int = 0; i < maxNum; i++){ var moveObject:MoveObject = new MoveObject(); moveObject.x = w * Math.random(); moveObject.y = h * Math.random(); moveObject.sx = Math.random() * 5 + 1; moveObject.sy = Math.random() * 5 + 1; objects.push(moveObject); } //开始运动 addEventListener(Event.ENTER_FRAME, onEnterFrame); } private function onEnterFrame(e:Event):void { bmd.fillRect(bmd.rect, 0x000000); for (var i:int = 0, n:int = objects.length; i < n; i++){ var item:MoveObject = objects[i]; bmd.copyPixels(zhidanBmd, zhidanBmd.rect, new Point(item.x, item.y)); item.update(); } } } }
cpu占用是0%
其实不清除面板更漂亮,效果:https://files.cnblogs.com/heycup/BitmapBufferTest2.swf
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