flash on 2013-11-22

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

package {
    import flash.text.TextField;
    import flash.display.Sprite;
    public class FlashTest extends Sprite {
        
        public var deb:TextField;
        
        public function FlashTest() {
           
           deb = new TextField();
           deb.mouseEnabled = false;
           deb.width = 320;
           deb.height = 240;
           addChild(deb);
           
           //ok so this is an experiment
           //to cancel out some of the velocity (nx,ny)
           //based on the gravity vector (kx, ky)
           //i was actually just messing around
           //but i think i still used vector projection unknowingly
           // anyway, it seems to work at least
           
           
           graphics.clear();
           graphics.lineStyle(2,0);
           
           var a:Number;
           var nx:Number;
           var ny:Number;
           var cx:Number;
           var cy:Number;
           
           var kx:Number;
           var ky:Number;
           
           cx = 200;
           cy = 200;
           
           a = 0.6;
           nx = Math.cos(a);
           ny = Math.sin(a);
           
            nx *= 3;
            ny *= 3;
          
           var ga:Number;
           ga = 1.57; //down (y+)
           //ga = 3.84;
           //ga = 0
           //ga = 1.57+0.6;
           
           
           //kx = 0;
           //ky = 1;
           
           kx = Math.cos(ga);
           ky = Math.sin(ga);
           
           
           //origin
           graphics.drawCircle(cx,cy,16);
           
           //original velocity in black
           graphics.moveTo(cx, cy);
           graphics.lineTo(cx+nx*64,cy+ny*64);
           
           //gravity (direction) in light blue
           graphics.lineStyle(2, 0xFF,0.3);
           graphics.moveTo(cx,cy);
           graphics.lineTo(cx+kx*64,cy+ky*64);
           
           kx = -kx;
           ky = -ky;
           
           //opposite of gravity (direction) in blue
           graphics.lineStyle(2, 0xFF);
           graphics.moveTo(cx,cy);
           graphics.lineTo(cx+kx*64,cy+ky*64);
           
           var d:Number;
           
           d = kx*nx + ky*ny;
           
           deb.text = " " + d + " " + kx*d + " " + ky*d;
          
              nx -= kx*d;
              ny -= ky*d;
           
           //final velocity in red
           graphics.lineStyle(2, 0xFF0000);
           graphics.moveTo(cx, cy);
           graphics.lineTo(cx+nx*64,cy+ny*64);
           
            
        }//ctor
        
        
        
    }//classend
}