forked from: Gradient Matrixの練習

↓夏blogエントリーから勉強させていただきました。
http://nutsu.com/blog/2009/020921_as_gradient_matrix.html

by fukt 23 Jun 2011

• Forked from sakusan393's Gradient Matrixの練習
• Diff: 4
• Related works: 1
Embed

// forked from sakusan393's Gradient Matrixの練習
/*
↓夏blogエントリーから勉強させていただきました。
http://nutsu.com/blog/2009/020921_as_gradient_matrix.html




*/


package  {
    import flash.display.MovieClip;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.geom.Matrix;
    import flash.geom.Point;
    import flash.display.GradientType;
    
    
    public class Main extends MovieClip{
        var x0:int = 100;
        var x1:int=  275;
        var y0:int= 100;
        var y1:int = 100;
        var speedX:int = 25;
        var speedY:int = 10;
        var pt0:Sprite = new Sprite();
        var pt1:Sprite = new Sprite();
        
                //グラデーションの設定
        var colors:Array = [0xff66ff,0x55aacc];
        var alphas:Array = [100,100];
        var ratios:Array = [0,0xff];
        
        public function Main() {
            pt0.x = x0;
            pt0.y = y0;
            pt0.graphics.beginFill(0xFF0000);
           // pt0.graphics.drawCircle(0,0,10);
            pt0.graphics.endFill();
            addChild(pt0);

            pt1.x = x1;
            pt1.y = y1;
            pt1.graphics.beginFill(0x0000FF);
           // pt1.graphics.drawCircle(0,0,10);
            pt1.graphics.endFill();
            addChild(pt1);
            
            addEventListener(Event.ENTER_FRAME,xStageEnterFrame);
        }
        function xStageEnterFrame(e:Event):void {
            if(pt0.x > stage.stageWidth){
                speedX = speedX*-1
            }
            if(pt0.x < 0){
                speedX = speedX*-0.5
            }
            if(pt1.y > stage.stageHeight){
                speedY = speedY*-1
            }
            if(pt1.y < 0){
                speedY = speedY*-1
            }
            
            
            pt0.x += speedX;
            pt1.y += speedY;
            
            var matrix:Matrix = new Matrix();
            //とりあえず単位行列的な
            matrix.createGradientBox( 1, 1, 0, -0.5, -0.5 );

            //線分のベクトル
            var vx:Number = pt1.x - pt0.x;
            var vy:Number = pt1.y - pt0.y;

            //線分の長さ(p0,p1の距離)
            var w:Number  = Math.sqrt( vx*vx + vy*vy );

            //傾き
            var r:Number  = Math.atan2( vy, vx );

            //中点
            var cx:Number = (pt0.x + pt1.x)/2;
            var cy:Number = (pt0.y + pt1.y)/2;

            //あとはあててくだけ
            matrix.scale( w, 1 );//線形なんで高さは 1 にしとく
            matrix.rotate( r );
            matrix.translate( cx, cy );



            graphics.beginGradientFill(GradientType.LINEAR, colors, alphas, ratios, matrix);
            graphics.drawRect(0, 0, stage.stageWidth, stage.stageHeight);
        }
    }
    
}