最近公司粉忙的~很久没来更新了~昨天朋友问起了涂鸦中的橡皮功能，网上查了一些资料，发现都写得比较复杂。后来了解了一下bitmapData的draw，发现如果重复draw的时候，选择特定的“混合模式”，即可实现清除功能。最新draw进去的内容会与之前的内容混合，重复的地方将会去掉。
先看看代码：
import flash.display.BitmapData;
import flash.geom.Rectangle;
import flash.geom.Matrix;
import flash.geom.ColorTransform;
//建立显示mc
this.createEmptyMovieClip("main", this.getNextHighestDepth());
main.createEmptyMovieClip("mc", main.getNextHighestDepth());
main.createEmptyMovieClip("show", main.getNextHighestDepth());
var content:BitmapData = new BitmapData(550,440,true,0x00FFFFFF);
main.show.attachBitmap(content,0)
//默认选中画笔
var action:Number = 0
txt.text = "当前选中:画笔"
mc_move.onPress = goDraw
//选中画笔
a.onPress = function(){
action = 0
txt.text = "当前选中:画笔"
main.mc._visible = true
mc_move.onPress = goDraw
}
//选中橡皮
b.onPress = function(){
action = 1
txt.text = "当前选中:橡皮"
main.mc._visible = false
mc_move.onPress = goDraw
}
//放开鼠标
mc_move.onRelease = function(){
delete onMouseMove
content.draw(main,new Matrix(),new ColorTransform(),1,new Rectangle(0,0,550,400))
main.mc.clear()
break;
}
mc_move.onReleaseOutside = mc_move.onRelease
//画线
function goDraw(){
main.mc.lineStyle(20)
main.mc.moveTo(_xmouse,_ymouse)
onMouseMove = function(){
main.mc.lineTo(_xmouse,_ymouse)
updateAfterEvent()
if(action==1){
//主要的代码,在使用橡皮的时候(action==1),draw的时候,"混合模式"选择12(第四个参数)
content.draw(main.mc,new Matrix(),new ColorTransform(),12)
}
}
}
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