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與先前的例子比較，這是一個漂亮的大工程，所以仔細看看代碼，玩玩最終生成的程序，之后我會詳細講解有關(guān)內(nèi)容。

代碼：

package
{
        import flash.display.Shape;
        import flash.display.Sprite;
        import flash.events.Event;
        import flash.events.KeyboardEvent;
        import flash.events.MouseEvent;
        import flash.filters.GlowFilter;
        import flash.ui.Keyboard;
       
        /**
         * ...
         * @author bardpub
         */
        [SWF(width=550,height=400,backgroundColor=0)]
        public class CopyingGraphics extends Sprite
        {
               
                private static const INIT_SEGMENTS:int = 10;
                private static const MAX_SEGMENTS:int = 20;
                private static const MIN_SEGMENTS:int = 3;
                private static const THICKNESS:int = 1;
                private static const COLOR:uint = 0x66CCCC;
                private static const ROTATION_RATE:int = 1;
               
                private var _shapeHolder:Sprite;
                private var _shapes:Vector.;
               
                public function CopyingGraphics()
                {
                        init();
                }
               
                private function init():void {
                       
                        _shapeHolder = new Sprite();
                        _shapeHolder.x = stage.stageWidth / 2;
                        _shapeHolder.y = stage.stageHeight / 2;
                        addChild(_shapeHolder);
                        _shapes = new Vector.();
                        for (var i:int = 0; i < INIT_SEGMENTS; i++ ) {
                                addSegment();
                        }
                        positionSegments();
                        stage.addEventListener(MouseEvent.MOUSE_DOWN, onStageMouseDown);
                        stage.addEventListener(MouseEvent.MOUSE_UP, onStageMouseUp);
                        stage.addEventListener(KeyboardEvent.KEY_DOWN, onStageKeyDown);
                        filters = [new GlowFilter(COLOR)];
                }
               
                private function draw():void {
                        var shape:Shape = _shapes[0];
                        shape.graphics.lineTo(shape.mouseX, shape.mouseY);
                        var segments:int = _shapeHolder.numChildren;
                        for (var i:int = 1; i < segments; i++ ) {
                                _shapes[i].graphics.copyFrom(shape.graphics);
                        }
                }
               
                private function addSegment():void {
                        var shape:Shape = new Shape();
                        if (_shapes.length > 0) {
                                shape.graphics.copyFrom(_shapes[0].graphics);
                        } else {
                                shape.graphics.lineStyle(THICKNESS, COLOR);
                        }
                        _shapes.push(shape);
                        _shapeHolder.addChild(shape);
                }
               
                private function removeSegment():void {
                        var shape:Shape = _shapes.pop();
                        _shapeHolder.removeChild(shape);
                }
               
                private function positionSegments():void {
                        var segments:int = _shapeHolder.numChildren;
                        var angle:Number = 360 / segments;
                        for (var i:int = 1; i < segments; i++ ) {
                                _shapes[i].rotation = angle * i;
                        }
                }
               
                private function onStageMouseDown(event:MouseEvent):void {
                        var shape:Shape = _shapes[0];
                        shape.graphics.moveTo(shape.mouseX, shape.mouseY);
                        addEventListener(Event.ENTER_FRAME, onEnterFrame);
                }
               
                private function onStageMouseUp(event:MouseEvent):void {
                        removeEventListener(Event.ENTER_FRAME, onEnterFrame);
                }
               
                private function onEnterFrame(event:Event):void {
                        _shapeHolder.rotation += ROTATION_RATE;
                        draw();
                }
               
                private function onStageKeyDown(event:KeyboardEvent):void {
                        switch (event.keyCode) {
                                case Keyboard.UP:
                                        if (_shapeHolder.numChildren < MAX_SEGMENTS) {
                                                addSegment();
                                                positionSegments();
                                        }
                                        break;
                                case Keyboard.DOWN:
                                        if (_shapeHolder.numChildren > MIN_SEGMENTS) {
                                                removeSegment();
                                                positionSegments();
                                        }
                                        break;
                        }
                }
        }
}

出處：藍色理想
責(zé)任編輯：bluehearts

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