Math.atan2 Example

by greentec 06 Aug 2014

• Related works: 1

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

package {
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Shape;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.geom.Point;
    
    public class FlashTest extends Sprite {
        
        public var _bitmap:Bitmap;
        public var whiteCircle:Shape;
        public var blackCircle1:Shape;
        public var blackCircle2:Shape;
        public var p1:Point = new Point(465 / 2 - 40, 465 / 2);
        public var p2:Point = new Point(465 / 2 + 40, 465 / 2);
        
        public function FlashTest() {
            // write as3 code here..
            _bitmap = new Bitmap(new BitmapData(465, 465, false, 0x292929));
            addChild(_bitmap);
            
            whiteCircle = new Shape();
            whiteCircle.graphics.beginFill(0xffffff);
            whiteCircle.graphics.drawCircle(p1.x, p1.y, 30);
            whiteCircle.graphics.drawCircle(p2.x, p2.y, 30);
            whiteCircle.graphics.endFill();
            
            addChild(whiteCircle);
            
            blackCircle1 = new Shape();
            blackCircle1.graphics.beginFill(0x0);
            blackCircle1.graphics.drawCircle(p1.x, p1.y, 10);
            blackCircle1.graphics.endFill();
            
            addChild(blackCircle1);
            
            blackCircle2 = new Shape();
            blackCircle2.graphics.beginFill(0x0);
            blackCircle2.graphics.drawCircle(p2.x, p2.y, 10);
            blackCircle2.graphics.endFill();
            
            addChild(blackCircle2);
            
            addEventListener(Event.ENTER_FRAME, onLoop);
        }
        
        private function onLoop(e:Event):void
        {
            var angle:Number = Math.atan2(mouseY - p1.y, mouseX - p1.x);
            blackCircle1.x = Math.cos(angle) * 18;
            blackCircle1.y = Math.sin(angle) * 18;
            
            angle = Math.atan2(mouseY - p2.y, mouseX - p2.x);
            blackCircle2.x = Math.cos(angle) * 18;
            blackCircle2.y = Math.sin(angle) * 18;
        }
    }
}