flash on 2010-5-4

by kihon 04 May 2010

Tags

BezierCurve
Embed

/**
 * Copyright kihon ( http://wonderfl.net/user/kihon )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/7Srx
 */

package
{
	import com.bit101.components.Label;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.geom.Point;
	
	public class Main extends Sprite
	{
		private var canvas:Sprite;
		private var t:Number = 0.0;
		private var a:Point = new Point(200, 200);
		private var b:Point = new Point(300, 50);
		private var c:Point = new Point(400, 200);
		private var label:Label;
		
		public function Main()
		{
			label = new Label(this, 260, 220);
			label.scaleX = label.scaleY = 2;
			
			canvas = new Sprite();
			addChild(canvas);
			
			addEventListener(Event.ENTER_FRAME, onEnterFrame);
		}
		
		private function onEnterFrame(event:Event):void 
		{
			label.text = "t = " + t.toFixed(2);
			
			var ab:Point = Point.interpolate(b, a, t);
			var bc:Point = Point.interpolate(c, b, t);
			var f:Point = Point.interpolate(bc, ab, t);
			
			with (canvas)
			{
				graphics.clear();
				graphics.lineStyle(2.0, 0x0, 0.1);
				graphics.moveTo(a.x, a.y);
				graphics.lineTo(b.x, b.y);
				graphics.lineTo(c.x, c.y);
				graphics.moveTo(ab.x, ab.y);
				graphics.lineTo(bc.x, bc.y);
				
				graphics.lineStyle(2.0, 0x0);
				graphics.beginFill(0xFFFFFF);
				graphics.drawCircle(a.x, a.y, 5);
				graphics.drawCircle(b.x, b.y, 5);
				graphics.drawCircle(c.x, c.y, 5);
				graphics.endFill();
				
				graphics.beginFill(0xED1A3D);
				graphics.drawCircle(ab.x, ab.y, 5);
				graphics.drawCircle(bc.x, bc.y, 5);
				graphics.endFill();
				
				graphics.beginFill(0x009AD6);
				graphics.drawCircle(f.x, f.y, 5);
				graphics.endFill();
			}
			
			graphics.beginFill(0x0);
			graphics.drawCircle(f.x, f.y, 1);
			graphics.endFill();
			
			t += 0.002;
			
			if (t > 1.0)
			{
				graphics.clear();
				t = 0;
			}
		}
	}
}