Trailing circle

package character;
import flixel.FlxSprite;
import flixel.util.FlxSpriteUtil;
import flixel.FlxG;
import flixel.util.loaders.CachedGraphics;
import flash.display.Graphics;

/**
 * ...
 * @author Masadow
 */
class Circle extends FlxSprite
{
    private var _timeleft : Float;

    public static function initGraphic()
    {
        //Prepare graphic
        var graphic : CachedGraphics = FlxG.bitmap.create(16, 16, 0x0, true, "circle");
        FlxSpriteUtil.flashGfx.clear();
        FlxSpriteUtil.flashGfx.beginFill(0xFFFFFFFF);
        FlxSpriteUtil.flashGfx.lineStyle(2, 0xFFFFFF, 0.5);
        FlxSpriteUtil.flashGfx.drawCircle(8, 8, 8);
        FlxSpriteUtil.flashGfx.endFill();
        graphic.bitmap.draw(FlxSpriteUtil.flashGfxSprite);
    }

    public function new(MakeGraphic : Bool = true)
    {
        super();

        loadGraphic("circle");

        visible = false;
    }

    public function run(X : Float, Y : Float) {
        x = X;
        y = Y;
        visible = true;
        _timeleft = 0.5; //In seconds
    }

    override public function update(): Void
    {
        super.update();

        if (_timeleft > 0 && (_timeleft -= FlxG.elapsed) < 0)
        {
            visible = false;
        }
    }
}