1 package 2 { 3 import flash.display.Bitmap; 4 import flash.display.BitmapData; 5 import flash.display.BlendMode; 6 import flash.display.DisplayObject; 7 import flash.display.DisplayObjectContainer; 8 import flash.display.Shape; 9 import flash.display.Sprite; 10 import flash.events.Event; 11 import flash.events.MouseEvent; 12 import flash.text.TextField; 13 import flash.text.TextFieldAutoSize; 14 15 [SWF(width="800",height="600")] 16 public class DrawToUndo extends Sprite 17 { 18 private var _undoBtn:Sprite; 19 private var _redoBtn:Sprite; 20 private var _eraseBtn:Sprite; 21 private var _drawBtn:Sprite; 22 private var _canvas:Sprite; 23 private var _bitmap:Bitmap; 24 private var _bitmapData:BitmapData; 25 private var _prevBmpd:BitmapData; 26 private var _line:Shape; 27 private var _thickness:Number=5; 28 private var _bmpdArr:Array=[];//BitmapData数组 29 private var _blendMode:String = BlendMode.NORMAL; 30 private var _stepID:int=-1; 31 public function DrawToUndo() 32 { 33 if(stage) init(); 34 else addEventListener(Event.ADDED_TO_STAGE,init); 35 } 36 private function init(e:Event=null):void 37 { 38 removeEventListener(Event.ADDED_TO_STAGE, init); 39 _canvas = new Sprite(); 40 _canvas.graphics.beginFill(0,0.1); 41 _canvas.graphics.drawRect(0,0,700,600); 42 _canvas.graphics.endFill(); 43 _undoBtn = creatButton(75,25,0xeeeeee,"撤销") as Sprite; 44 _redoBtn = creatButton(75,25,0xeeeeee,"重做") as Sprite; 45 _eraseBtn = creatButton(75,25,0xeeeeee,"擦除") as Sprite; 46 _drawBtn = creatButton(75,25,0xeeeeee,"涂鸦") as Sprite; 47 _bitmap = new Bitmap(); 48 _bitmapData = new BitmapData(700,600,true,0); 49 _bitmap.bitmapData = _bitmapData; 50 _line = new Shape(); 51 52 addToDisplay(_undoBtn,this,710,10); 53 addToDisplay(_redoBtn,this,710,45); 54 addToDisplay(_eraseBtn,this,710,80); 55 addToDisplay(_drawBtn,this,710,115); 56 addToDisplay(_canvas,this); 57 addToDisplay(_bitmap,_canvas); 58 addToDisplay(_line,_canvas,0,0,1,false); 59 initEventListener(); 60 } 61 private function initEventListener():void 62 { 63 _undoBtn.addEventListener(MouseEvent.CLICK,onUndo); 64 _redoBtn.addEventListener(MouseEvent.CLICK,onRedo); 65 _eraseBtn.addEventListener(MouseEvent.CLICK,onErase); 66 _drawBtn.addEventListener(MouseEvent.CLICK,onDraw); 67 _canvas.addEventListener(MouseEvent.MOUSE_DOWN,onDown); 68 } 69 private function onDown(e:MouseEvent):void 70 { 71 stage.addEventListener(MouseEvent.MOUSE_UP,onUp); 72 stage.addEventListener(MouseEvent.MOUSE_MOVE,onMove); 73 _line.graphics.lineStyle(_thickness,0xff00ff); 74 _line.graphics.moveTo(_canvas.mouseX,_canvas.mouseY); 75 while(_stepID<_bmpdArr.length-1){ 76 _bmpdArr.pop(); 77 if(_stepID!=-1) _prevBmpd = _bmpdArr[_stepID]; 78 } 79 if(_prevBmpd){ 80 var bmpd:BitmapData = _prevBmpd.clone(); 81 }else { 82 bmpd = new BitmapData(700,600,true,0); 83 } 84 _stepID++; 85 _bitmap.bitmapData = bmpd; 86 _prevBmpd = bmpd; 87 _bmpdArr.push(bmpd); 88 89 function onMove(e:MouseEvent):void 90 { 91 _line.graphics.lineTo(_canvas.mouseX,_canvas.mouseY); 92 bmpd.draw(_line,null,null,_blendMode,null,true); 93 } 94 function onUp(e:MouseEvent):void 95 { 96 _line.graphics.clear(); 97 stage.removeEventListener(MouseEvent.MOUSE_UP,onUp); 98 stage.removeEventListener(MouseEvent.MOUSE_MOVE,onMove); 99 } 100 } 101 private function onUndo(e:MouseEvent):void 102 { 103 if(_stepID>0){ 104 _stepID--; 105 _bitmap.bitmapData = _bmpdArr[_stepID]; 106 //_prevBmpd = _bmpdArr[_stepID]; 107 }else{ 108 _prevBmpd = null; 109 _bitmap.bitmapData = null; 110 _stepID=-1; 111 } 112 113 } 114 private function onRedo(e:MouseEvent):void 115 { 116 if(_stepID<_bmpdArr.length-1){ 117 _stepID++; 118 _bitmap.bitmapData = _bmpdArr[_stepID]; 119 //_prevBmpd = _bmpdArr[_stepID]; 120 } 121 } 122 private function onErase(e:MouseEvent):void 123 { 124 _blendMode = BlendMode.ERASE; 125 _thickness = 10;//擦除的粗细 126 } 127 private function onDraw(e:MouseEvent):void 128 { 129 _blendMode = BlendMode.NORMAL; 130 _thickness = 5;//涂鸦的粗细 131 } 132 private function creatButton(w:Number,h:Number,color:uint,text:String=""):Sprite 133 { 134 var button:Sprite = new Sprite(); 135 button.graphics.beginFill(color,1); 136 button.graphics.drawRect(0,0,w,h); 137 button.graphics.endFill(); 138 var t:TextField = new TextField(); 139 t.autoSize = TextFieldAutoSize.LEFT; 140 t.selectable = false; 141 t.text = text; 142 button.addChild(t); 143 t.x = (button.width-t.width)*.5; 144 t.y = (button.height-t.height)*.5; 145 return button; 146 } 147 private function addToDisplay(target:DisplayObject,parent:DisplayObjectContainer,x:Number=0,y:Number=0,alpha:Number=1,visible:Boolean = true,scaleX:Number=1,scaleY:Number=1):void 148 { 149 parent.addChild(target); 150 target.x = x; 151 target.y = y; 152 target.alpha = alpha; 153 target.visible = visible; 154 target.scaleX = scaleX; 155 target.scaleY = scaleY; 156 } 157 } 158 }