Mandelbrot image for Processing

mandelbrot.java

int maxIter = 100; // maximum iterations
float zoom = 200;  // zoom level
float offsetX = 0; // horizontal shift
float offsetY = 0; // vertical shift

void setup() {
  size(800, 800);
  loadPixels();
  for (int x = 0; x < width; x++) {
    for (int y = 0; y < height; y++) {
      // Map pixel to complex plane
      float a = map(x, 0, width, -2.5, 1) + offsetX;
      float b = map(y, 0, height, -1.5, 1.5) + offsetY;

      float ca = a;
      float cb = b;

      int n = 0;

      while (n < maxIter) {
        float aa = a * a - b * b;
        float bb = 2 * a * b;
        a = aa + ca;
        b = bb + cb;
        
        if (abs(a + b) > 16) { 
          break; 
        }
        n++;
      }

      // Map iteration count to color
      float bright = map(n, 0, maxIter, 0, 255);
      if (n == maxIter) bright = 0;
      color col = color(bright, bright * 0.5, 255 - bright);
      pixels[x + y * width] = col;
    }
  }
  updatePixels();
}

void draw() {
  // Nothing needed here, static image
}