Graphics Flash ActionScript

package {
     
     import flash.display.GradientType;
     import flash.display.Shape;
     import flash.display.Sprite;
     
     [SWF(width=550, height=400)]
     
     public class Main extends Sprite {
     
          public function Main() {
               // Create and center ellipse shape on stage
               var ellipse:Shape = new Shape();
               addChild(ellipse);
               ellipse.x = stage.stageWidth / 2;
               ellipse.y = stage.stageHeight / 2;
               
               // Set basic line style
               ellipse.graphics.lineStyle(30);
               
               // Set up gradient properties
               var colors:Array = 
                    [
                         0xFF0000,
                         0xFF6600,
                         0xFFFF00,
                         0x00FF00,
                         0x0000FF,
                         0x2E0854,
                         0x8F5E99
                    ];
               var alphas:Array = [1,1,1,1,1,1,1];
               var ratios:Array = [0,42,84,126,168,210,255];
               
               // Set gradient line style
               ellipse.graphics.lineGradientStyle(GradientType.LINEAR, colors, alphas, ratios);
               
               // Draw ellipse
               ellipse.graphics.drawEllipse(-100, -50, 200, 100);
          }
     
     }
}