Kaleidoscope - RealWorld forums

You know what that is

Code
Configuration

Configuration.AddSlider("sides", "Sides", "", 3, 100, 7);
Configuration.AddSlider("angle", "Angle", "", 0, 360, 0);
Configuration.AddSlider("rotation", "Rotation", "", 0, 360, 0);
Configuration.AddSlider("centerX", "Center X", "What percentage of the images width is Center X", 3, 100, 50);
Configuration.AddSlider("centerY", "Center Y", "What percentage of the images height is Center Y", 3, 100, 50);

Execution

// Joel Besada
// https://github.com/JoelBesada/JSManipulate
// Plus PAEz touch here and there

function getBilerpixel(l, x, y, w, h) {
	var corner = [];
	var xi, yi, xip, xip1;
	var yip, yip1;

	xi = ~~x;
	yi = ~~y;
	xip = Math.max(Math.min(xi, w - 1), 0);
	xip1 = Math.max(Math.min(xi + 1, w - 1), 0);
	yip1 = Math.max(Math.min(yi + 1, h - 1), 0);
	yip = Math.max(Math.min(yi, h - 1), 0);

	corner[0] = l.GetPixel(xip, yip, 0, 0); //this.layers[l].data32[xip + yip];
	corner[1] = l.GetPixel(xip1, yip, 0, 0); //this.layers[l].data32[xip1 + yip];
	corner[2] = l.GetPixel(xip, yip1, 0, 0); //this.layers[l].data32[xip + yip1];
	corner[3] = l.GetPixel(xip1, yip1, 0, 0); //this.layers[l].data32[xip1 + yip1];

	return cosineInterpolate(corner, (x - xi), (y - yi));
}

function cosineInterpolate(v, x, y) {
	var f1, f2, mf1, mf2, g0, g1, g2, g3;
	var color, r, g, b;
	mf1 = (1 - Math.cos(x * Math.PI)) * 0.5;
	mf2 = (1 - Math.cos(y * Math.PI)) * 0.5;
	var f1 = 1 - mf1;
	var f2 = 1 - mf2;
	var g0 = f1 * f2;
	var g1 = mf1 * f2;
	var g2 = f1 * mf2;
	var g3 = mf1 * mf2;

	color = ((v[0] & 255) * g0 + (v[1] & 255) * g1 + (v[2] & 255) * g2 + (v[3] & 255) * g3);
	color = color | ((((v[0] >> 8 & 255) * g0 + (v[1] >> 8 & 255) * g1 + (v[2] >> 8 & 255) * g2 + (v[3] >> 8 & 255) * g3) & 255) << 8);
	color = color | ((((v[0] >> 16 & 255) * g0 + (v[1] >> 16 & 255) * g1 + (v[2] >> 16 & 255) * g2 + (v[3] >> 16 & 255) * g3) & 255) << 16);
	color = color | ((((v[0] >> 24 & 255) * g0 + (v[1] >> 24 & 255) * g1 + (v[2] >> 24 & 255) * g2 + (v[3] >> 24 & 255) * g3) & 255) << 24);
	return color;
}

transformFilter = function(inputData, outputData, transformInverse, width, height) {
	var out = [];
	for (var y = 0; y < height; y++) {
		for (var x = 0; x < width; x++) {
			transformInverse.apply(this, [x, y, out]);
			var srcX = out[0];
			var srcY = out[1];

			var w = width - 2;
			var h = height - 2;
			var direction = 1;

			while (srcX < 0 || srcX > w) {
				if (srcX > w) {
					srcX = w - (srcX - w);
					direction = -1;
				}
				if (srcX < 0) {
					srcX *= -1;
					direction = 1;
				}
			}
			while (srcY < 0 || srcY > h) {
				if (srcY > h) {
					srcY = h - (srcY - h);
					direction = -1;
				}
				if (srcY < 0) {
					srcY *= -1;
					direction = 1;
				}
			}

			//var srcX2=srcX+direction;
			//var srcY2=srcY+direction;

			var rgba = getBilerpixel(inputData, srcX, srcY, width - 1, height - 1);

			outputData.SetPixel(x, y, 0, 0, rgba);
		}
	}
}
mod = function(a, b) {
	var n = parseInt(a / b);
	a -= n * b;
	if (a < 0) {
		return a + b;
	}
	return a;
}
triangle = function(x) {
	var r = this.mod(x, 1);
	return 2 * (r < 0.5 ? r : 1 - r);
}

filter = function(angle, rotation, sides, centerX, centerY) {
	var input = Document.RasterImage;
	var width = input.sizeX;
	var height = input.sizeY;

	var clone;
	clone = Document.Duplicate();
	clone = clone.RasterImage;
	var iCenterX = width * centerX;
	var iCenterY = height * centerY;
	angle = angle / 180 * Math.PI;
	rotation = rotation / 180 * Math.PI;
	var transInverse = function(x, y, out) {

		var dx = x - iCenterX;
		var dy = y - iCenterY;
		var r = Math.sqrt(dx * dx + dy * dy);
		var theta = Math.atan2(dy, dx) - angle - rotation;
		theta = triangle(theta / Math.PI * sides * 0.5);
		theta += angle;
		out[0] = iCenterX + r * Math.cos(theta);
		out[1] = iCenterY + r * Math.sin(theta);
	}
	transformFilter(clone, input, transInverse, width, height);
}
var angle = Configuration.angle;
var rotation = Configuration.rotation;
var sides = Configuration.sides;
var centerX = Configuration.centerX/100;
var centerY = Configuration.centerY/100;
filter(angle, rotation, sides, centerX, centerY);

slow this one, so turn off preview

Note
Converting code that doesn't work right in the first place SUX!!