透明画像

TranceparentGlid.as

/**
 *============================================================
 * copyright(c) 2011 www.itoz.jp
 * @author  itoz
 *============================================================
 */
package jp.itoz.display
{
    import flash.display.Sprite;
    import flash.display.Shape;

    /**
     * 背景透過を表す格子状Viewクラス
     */
     public class TranceparentGrid extends Sprite
    {
        private var _bgColor : int = 0xffffff;
        private var _squareColor : int = 0xefefef;

        public function TranceparentGrid()
        {
        }

        public function draw(sizeW : int, sizeH : int, span : int=10) : void
        {
            this.graphics.clear();
            this.graphics.beginFill(_bgColor);
            this.graphics.drawRect(0, 0, sizeW, sizeH);
            this.graphics.endFill();
            this.graphics.beginFill(_squareColor);

            var pretd : Number = (sizeW) / span;
            var pretr : Number = (sizeH) / span;
            var td : int = ( pretd == int(pretd) ) ? pretd : int(pretd + 1);
            var tr : int = ( pretr == int(pretr) ) ? pretr : int(pretr + 1);

            for (var i : int = 0; i < tr; i++) {
                for (var j : int = 0; j < td; j++) {
                    if (i % 2 == 0) {
                        if (j % 2 == 0) {
                            this.graphics.drawRect(j * span, i * span, span, span);
                        }
                    }
                    else {
                        if (j % 2 == 1) {
                            this.graphics.drawRect(j * span, i * span, span, span);
                        }
                    }
                }
            }
            this.graphics.endFill();
        }
    }
}