Flash教程：用AS3代码实现鼠标跟随喷枪涂鸦效果(2)

var wallCanvas:BitmapData = new BitmapData(stage.stageWidth,stage.stageHeight - 100,true, 0x00ffffff);

var bitmap:Bitmap = new Bitmap(wallCanvas);

addChild (bitmap);

drawingArea.addEventListener (MouseEvent.MOUSE_DOWN, mouseDownHandler);

stage.addEventListener (MouseEvent.MOUSE_UP, mouseUpHandler);

var color:uint;

var maxRadius:Number;

var density:Number;

function mouseDownHandler (event:MouseEvent):void {

addEventListener (Event.ENTER_FRAME, onEnterFrame);

}

function mouseUpHandler (event:MouseEvent):void {

removeEventListener (Event.ENTER_FRAME, onEnterFrame);

}

function onEnterFrame (event:Event):void {

maxRadius = sizeSlider.value;

color = myColorPicker.selectedColor + 0xff000000;

density = densitySlider.value;

for (var i:int = 0; i < density; i++) {

var angle:Number = Math.random() * Math.PI * 2;

var radius:Number = Math.random() * maxRadius;

var xPos:Number = mouseX + Math.cos(angle) * radius;

var yPos:Number = mouseY + Math.sin(angle) * radius;

wallCanvas.setPixel32 (xPos, yPos, color);

}

}