// All Examples Written by Casey Reas and Ben Fry// unless otherwise stated.void setup() { size(200,200); frameRate(30);}void draw() { loadPixels(); float n = (mouseX * 10.0) / width; float w = 16.0; // 2D space width float h = 16.0; // 2D space height float dx = w / width; // Increment x this amount per pixel float dy = h / height; // Increment y this amount per pixel float x = -w/2; // Start x at -1 * width / 2 for (int i = 0; i < width; i++) { float y = -h/2; // Start y at -1 * height / 2 for (int j = 0; j < height; j++) { float r = sqrt((x*x) + (y*y)); // Convert cartesian to polar float theta = atan2(y,x); // Convert cartesian to polar // Compute 2D polar coordinate function float val = sin(n*cos(r) + 5 * theta); // Results in a value between -1 and 1 //float val = cos(r); // Another simple function //float val = sin(theta); // Another simple function // Map resulting vale to grayscale value pixels[i+j*width] = color((val + 1.0) * 255.0/2.0); // Scale to between 0 and 255 y += dy; // Increment y } x += dx;