curveToを使って円を描く

by tomonori855 31 Jan 2010

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/**
 * Copyright tomonori855 ( http://wonderfl.net/user/tomonori855 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/8rBe
 */

// forked from tomonori855's 三角関数を使って円を描く
// forked from tomonori855's forked from: forked from: 線を描くクラスを使って線を描く


package {
    import flash.display.Sprite;
	public class DrawCircle3 extends Sprite {
		public function DrawCircle3(){
			var centerX:Number = 100;
			var centerY:Number = 200;
			var r:Number = 50;
			
			graphics.lineStyle(2, 0xFF0006);
			graphics.moveTo(centerX+r, centerY);
			
			graphics.curveTo(r+centerX, 
			                 Math.tan(Math.PI/8)*r+centerY,
			                 Math.sin(Math.PI/4)*r+centerX,
			                 Math.sin(Math.PI/4)*r+centerY);
			
			graphics.curveTo(Math.tan(Math.PI/8)*r+centerX, 
			                 r+centerY,
			                 centerX,
			                 r+centerY);
			                 
			graphics.curveTo(-Math.tan(Math.PI/8)*r+centerX, 
			                 r+centerY,
			                 -Math.sin(Math.PI/4)*r+centerX,
			                 Math.sin(Math.PI/4)*r+centerY);
			                 
			graphics.curveTo(-r+centerX, 
			                 Math.tan(Math.PI/8)*r+centerY,
			                 -r+centerX,
			                 centerY);
			                 
			graphics.curveTo(-r+centerX, 
			                 -Math.tan(Math.PI/8)*r+centerY,
			                 -Math.sin(Math.PI/4)*r+centerX,
			                 -Math.sin(Math.PI/4)*r+centerY);
			                 
			graphics.curveTo(-Math.tan(Math.PI/8)*r+centerX, 
			                 -r+centerY,
			                 centerX,
			                 -r+centerY);
			                 			                 
			graphics.curveTo(Math.tan(Math.PI/8)*r+centerX, 
			                 -r+centerY,
			                 Math.sin(Math.PI/4)*r+centerX,
			                 -Math.sin(Math.PI/4)*r+centerY);
			                 
			                 			                 
			graphics.curveTo(r+centerX, 
			                 -Math.tan(Math.PI/8)*r+centerY,
			                 r+centerX,
			                 centerY);
			                 
			                                  
		}
	}
}