08_CopyingGraphics

/**
 * Copyright amashio ( http://wonderfl.net/user/amashio )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/3aNF
 */

package{
    
    import flash.display.Sprite;
    import flash.display.Shape;
    import flash.events.KeyboardEvent;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.filters.GlowFilter;
    import flash.ui.Keyboard;
    
    public class Main extends Sprite{
        
        private static const INIT_SEGMENTS:uint = 10;
        private static const MAX_SEGMENTS:uint = 20;
        private static const MIN_SEGMENTS:uint = 3;
        private static const THICKNESS:uint = 1;
        private static const COLOR:uint = 0x66CCCC;
        private static const ROTATION_RATE:uint = 1;
        
        private var _shapeHolder:Sprite;
        private var _shapes:Vector.<Shape>;
        
        public function Main(){
            init();        
        }
        
        public function init():void{
            _shapeHolder = new Sprite();
            _shapeHolder.x = stage.stageWidth/2;
            _shapeHolder.y = stage.stageHeight/2;
            addChild(_shapeHolder);
            _shapes = new Vector.<Shape>();
            for(var i:uint = 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:uint = _shapeHolder.numChildren;
            for(var i:uint = 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:uint = _shapeHolder.numChildren;
            var angle:Number = 360/segments;
            for(var i:uint = 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, onThisEnterFrame);
        }
        
        private function onStageMouseUp(event:MouseEvent):void{
            removeEventListener(Event.ENTER_FRAME, onThisEnterFrame);
        }
        
        private function onThisEnterFrame(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;
            }
        }
    }
}