Sierpinski Valentine

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license : see code comments
modified : 2010-02-14 14:58:11

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package  {
	import flash.display.Sprite;
	import flash.geom.Point;
	import flash.text.TextField;
	import flash.text.TextFormat;
	
	/**
	 * Inspired by xkcd №543.
	 * @author makc
	 */
	[SWF(width=800,height=800)]
	public class Heart3 extends Sprite {

// Change this to your message
		public const text:String = "MAKA+OKA=";

public function Heart3 () {
			mouseEnabled = false; mouseChildren = false;

// triangle
			var r:Number = 0.5 * 800;
			var x1:Number = r * (1 + Math.cos ( - Math.PI / 6)), y1:Number = r * (1 - Math.sin ( - Math.PI / 6));
			var x2:Number = r * (1 + Math.cos ( + Math.PI / 2)), y2:Number = r * (1 -  Math.sin ( + Math.PI / 2));
			var x3:Number = r * (1 + Math.cos ( 7*Math.PI / 6)), y3:Number = r * (1 - Math.sin ( 7*Math.PI / 6));

graphics.lineStyle (4, 0xFF7F7F); graphics.moveTo (x1, y1);
			graphics.lineTo (x2, y2); graphics.lineTo (x3, y3); graphics.lineTo (x1, y1);

scaleY = 0.8; y = 150;

// generate basic heart, y = sqrt(|x|)/2 +/- sqrt((1-x^2)/2)
			// http://www.mathematische-basteleien.de/heart.htm
			heart = new Vector.<Point> ();
			var a:Number, b:Number;
			for (x1 = -1; x1 < +1; x1 += 0.01) {
				a = Math.sqrt (Math.abs (x1)) / 2; b = Math.sqrt ((1 - x1 * x1) / 2);
				heart.push (new Point (x1, -a -b));
			}
			for (x1 = +1; x1 > -1; x1 -= 0.01) {
				a = Math.sqrt (Math.abs (x1)) / 2; b = Math.sqrt ((1 - x1 * x1) / 2);
				heart.push (new Point (x1, -a +b));
			}

// hearts
			var i:int, j:int = 0;
			for (i = 0; i < data.length; i++) {
				drawHeartShape (data [i].x, data [i].y, data [i].s);

// draw message
				var p:Number = 0;
				while (int (p) < heart.length) {
					// get letter
					var t:TextField = new TextField; t.text = text.charAt (j);
					t.autoSize = "left"; t.selectable = false; t.textColor = 0xFF7F7F;
					var f:TextFormat = t.getTextFormat (); f.size = int (Math.sqrt (data [i].s)); t.setTextFormat (f);
					var w:Number = t.getRect (t).width;

var found:Boolean = false;
					var p0:Point = heart [(int(p) -1 + heart.length) % heart.length];
					var p1:Point = heart [(int(p) +0 + heart.length) % heart.length];
					var p2:Point = heart [(int(p) +1 + heart.length) % heart.length];
					var p3:Point = heart [(int(p) +2 + heart.length) % heart.length];
					var pA:Point = spline (p0, p1, p2, p3, p - int (p));
					var pB:Point = pA.clone ();
					while (Point.distance (pA, pB) * data [i].s < w * 0.8) {
						p += 0.1;
						found = true; if (p > heart.length + 1) { found = false; break; }

p0 = heart [(int(p) -1 + heart.length) % heart.length];
						p1 = heart [(int(p) +0 + heart.length) % heart.length];
						p2 = heart [(int(p) +1 + heart.length) % heart.length];
						p3 = heart [(int(p) +2 + heart.length) % heart.length];
						pB = spline (p0, p1, p2, p3, p - int (p));

// hack against the bug near heart's bottom
						if (Math.abs (p - heart.length * 0.75) < 5) found = false;
					}

if (found) {
						var sp:Sprite = new Sprite; sp.addChild (t); t.x = - 0.1 * Number (f.size); t.y = -0.3 * Number (f.size);
						sp.rotationZ = 180 * Math.atan2 (pA.y - pB.y, pA.x - pB.x) / Math.PI - 180;
						sp.x = pA.x * data [i].s + data [i].x;
						sp.y = pA.y * data [i].s + data [i].y;
						addChild (sp);

j++; j %= text.length;
					}
				}
			}
		}

private var heart:Vector.<Point>;

private function drawHeartShape (x:Number, y:Number, s:Number):void {
			graphics.lineStyle (2, 0xFF7F7F);
			for (var i:int = 0; i < heart.length + 1; i++) {
				graphics [(i == 0) ? "moveTo" : "lineTo"] (x + heart [i % heart.length].x * s, y + heart [i % heart.length].y * s);
			}
		}

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/* 
        * Calculates 2D cubic Catmull-Rom spline.
        * @see http://www.mvps.org/directx/articles/catmull/ 
        */ 
        private function spline (p0:Point, p1:Point, p2:Point, p3:Point, t:Number):Point {
            return new Point (
				0.5 * ((          2*p1.x) +
					t * (( -p0.x           +p2.x) +
					t * ((2*p0.x -5*p1.x +4*p2.x -p3.x) +
					t * (  -p0.x +3*p1.x -3*p2.x +p3.x)))),
				0.5 * ((          2*p1.y) +
					t * (( -p0.y           +p2.y) +
					t * ((2*p0.y -5*p1.y +4*p2.y -p3.y) +
					t * (  -p0.y +3*p1.y -3*p2.y +p3.y))))
			);
        }

private function splineGradient (p0:Point, p1:Point, p2:Point, p3:Point, t:Number):Point {
			return new Point (
				0.5 * (
					-p0.x + p2.x +
					2 * (2 * p0.x - 5 * p1.x + 4 * p2.x - p3.x) * t +
					3 * (-p0.x + 3 * p1.x - 3 * p2.x + p3.x) * t * t
				),
				0.5 * (
					-p0.y + p2.y +
					2 * (2 * p0.y - 5 * p1.y + 4 * p2.y - p3.y) * t +
					3 * (-p0.y + 3 * p1.y - 3 * p2.y + p3.y) * t * t
				)
			);
		}
	}
}

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