flash on 2011-8-12

/**
 * Copyright Geo877 ( http://wonderfl.net/user/Geo877 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/pOzU
 */

package
{
    import flash.display.Sprite;
    import flash.events.TouchEvent;
    import flash.text.AntiAliasType;
    import flash.text.TextField;
    import flash.text.TextFormat;
    import flash.ui.Multitouch;
    import flash.ui.MultitouchInputMode;

    [SWF(width=320, height=460, frameRate=24, backgroundColor=0xEB7F00)]
    public class MultitouchExample extends Sprite
    {
        private var dots:Object;
        private var labels:Object;
        private var labelFormat:TextFormat;
        private var dotCount:uint;
        private var dotsLeft:TextField;
        private static const LABEL_SPACING:uint = 15;
        
        public function MultitouchExample()
        {
            super();

            this.labelFormat = new TextFormat();
            labelFormat.color = 0xACF0F2;
            labelFormat.font = "Helvetica";
            labelFormat.size = 11;
            
            this.dotCount = 0;

            this.dotsLeft = new TextField();
            this.dotsLeft.width = 300;
            this.dotsLeft.defaultTextFormat = this.labelFormat;
            this.dotsLeft.x = 3;
            this.dotsLeft.y = 0;
            this.stage.addChild(this.dotsLeft);
            this.updateDotsLeft();

            this.dots = new Object();
            this.labels = new Object();

            Multitouch.inputMode = MultitouchInputMode.TOUCH_POINT;
            this.stage.addEventListener(TouchEvent.TOUCH_BEGIN, onTouchBegin);
            this.stage.addEventListener(TouchEvent.TOUCH_MOVE, onTouchMove);
            this.stage.addEventListener(TouchEvent.TOUCH_END, onTouchEnd);
        }

        private function onTouchBegin(e:TouchEvent):void
        {
            if (this.dotCount == Multitouch.maxTouchPoints) return;
            var dot:Sprite = this.getCircle();
            dot.x = e.stageX;
            dot.y = e.stageY;
            this.stage.addChild(dot);
            dot.startTouchDrag(e.touchPointID, true);
            this.dots[e.touchPointID] = dot;
            
            ++this.dotCount;

            var label:TextField = this.getLabel(e.stageX + ", " + e.stageY);
            label.x = 3;
            label.y = this.dotCount * LABEL_SPACING;
            this.stage.addChild(label);
            this.labels[e.touchPointID] = label;

            this.updateDotsLeft();
        }
        
        private function onTouchMove(e:TouchEvent):void
        {
            var label:TextField = this.labels[e.touchPointID];
            label.text = (e.stageX + ", " + e.stageY);
        }
        
        private function onTouchEnd(e:TouchEvent):void
        {
            var dot:Sprite = this.dots[e.touchPointID];
            var label:TextField = this.labels[e.touchPointID];
            
            this.stage.removeChild(dot);
            this.stage.removeChild(label);
            
            delete this.dots[e.touchPointID];
            delete this.labels[e.touchPointID];
            
            --this.dotCount;

            this.updateDotsLeft();
        }
        
        private function getCircle(circumference:uint = 40):Sprite
        {
            var circle:Sprite = new Sprite();
            circle.graphics.beginFill(0x1695A3);
            circle.graphics.drawCircle(0, 0, circumference);
            return circle;
        }

        private function getLabel(initialText:String):TextField
        {
            var label:TextField = new TextField();
            label.defaultTextFormat = this.labelFormat;
            label.selectable = false;
            label.antiAliasType = AntiAliasType.ADVANCED;
            label.text = initialText;
            return label;
        }
        
        private function updateDotsLeft():void
        {
            this.dotsLeft.text = "Touches Remaining: " + (Multitouch.maxTouchPoints - this.dotCount);
        }
    }
}