forked from: Fermat's Spiral

/**
 * Copyright gillit1984 ( http://wonderfl.net/user/gillit1984 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/l5P6
 */

// forked from yuuganisakase's Fermat's Spiral
//
//you perceive that particles move to center but this is just illusion.
//move the slider to change the roatation speed.
//
//超高速回転させると吸い込んでいるように見える！
//

package 
{
    import com.bit101.components.Slider;
    import com.flashdynamix.motion.effects.core.ColorEffect;
    import com.flashdynamix.motion.effects.core.FilterEffect;
    import com.flashdynamix.motion.layers.BitmapLayer;
    import flash.display.BitmapData;
    import flash.display.Shape;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.filters.BlurFilter;
    import flash.geom.ColorTransform;
    import flash.geom.Matrix;
    import flash.geom.Point;


    [SWF(width=465, height=465, frameRate=60, backgroundColor=0x111111)]
    public class Spiral extends Sprite
    {
        private var theta:Number;
        private var holder:Sprite;
        private var layer:BitmapLayer;
        private var slider:Slider;
        private var g:Shape;
        private var rotationSpeed:Number = 0.05;
        private const BmSize:Number = 700;
        
        public function Spiral():void 
        {
 Wonderfl.capture_delay(9);
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);
        }
        
        private function init(e:Event = null):void 
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);

            layer = new BitmapLayer(BmSize, BmSize,1,0x111111,false,true);
            layer.clearOnRender = false;
            //var bl:BlurFilter = new BlurFilter(4,4);
            //layer.add(new FilterEffect(bl));
            //layer.add(new ColorEffect(new ColorTransform(1, 1, 1, 0.9)));
            //addChild(layer);
            //layer.x = layer.y = - (BmSize / 10);
            holder = new Sprite();
            holder.x = holder.y = 465 / 2;
            
            addChild(holder);
            holder.addChild(layer);
            
            g = new Shape();
            
            slider = new Slider(Slider.HORIZONTAL, this, 10, 440, onClick);
            slider.setSize(150, 15);
            slider.value = 60;
            slider.backClick = true;
                        
            theta = 0;
            onClick();
            addEventListener(Event.ENTER_FRAME, onEnter);
            stage.addEventListener(MouseEvent.MOUSE_UP, onClick);
        }
    
        private function drawFermat(c:Number = 0):void
        {
            
            if (c > 120) return;
            var r:Number;
            var p:Point;
            if (c >= 0) {
                r = 32 * Math.sqrt(c);
                p = Point.polar(r, c);
            }
            g.graphics.lineStyle(3, Math.random()*0xFFFFFF);
            g.graphics.drawCircle(p.x, p.y, 1);
            g.graphics.drawCircle( -p.x, -p.y, 1);
            layer.bitmapData.draw(g, new Matrix(1,0,0,1,BmSize/2, BmSize/2));
            g.graphics.clear();
        }
        private function rotate():void
        {
            holder.rotation += rotationSpeed;
        }
        private function onClick(e:Event = null):void 
        {
            
            layer.x = layer.y = -(BmSize)/2;
            //layer.bitmapData.fillRect(layer.bitmapData.rect, layer.bgColor);
            rotationSpeed = slider.value * 0.1;
            //theta = 0;
            
            g.graphics.clear();
            g.graphics.lineStyle(3, 0xFFFFFF);
        }
        
        private function onEnter(e:Event):void 
        {
            drawFermat(theta);
            rotate();

            if (theta < 1) theta += 0.04;
            else theta += 0.1;
            
            
        }

    }
    
}