Processing

void setup() {
  size (600, 600);
  background(255);
  surface.setResizable(true);
  surface.setLocation(0, 0);
  noLoop();
}

void draw(){

}
// Constants
int Y_AXIS = 1;
int X_AXIS = 2;
color b1, b2, c1, c2;

void setGradient(int x, int y, int w, int h, color c1, color c2, int axis ) {


  if (axis == Y_AXIS) {  // Top to bottom gradient
    for (int i = y; i <= y+h; i++) {
      float inter = map(i, y, y+h, 0, 1);
      color c = lerpColor(c1, c2, inter);
      stroke(c);
      line(x, i, x+w, i);
    }
  } else if (axis == X_AXIS) {  // Left to right gradient
    for (int i = x; i <= x+w; i++) {
      float inter = map(i, x, x+w, 0, 1);
      color c = lerpColor(c1, c2, inter);
      stroke(c);
      line(i, y, i, y+h);
    }
  }
}
int tile = width/20;
int half = tile/2;
float size = tile/2; 

translate(tile/2, tile/2);


  for (int y=0; y<height; y+=tile) {
    for (int x=0; x<width; x+=tile) {
      pushMatrix();
      translate (x, y);
      rotate(degrees(angle));
      rect(0, 0, size, size);
      //line(x-half, y-half, x+half, y+half);
      popMatrix();
    }
  }

int tile = width/20;
int half = tile/2;
float size = tile/2; 

translate(tile/2, tile/2);


  for (int y=0; y<height; y+=tile) {
    for (int x=0; x<width; x+=tile) {
      pushMatrix();
      translate (x, y);
      rotate(degrees(angle));
      rect(0, 0, size, size);
      //line(x-half, y-half, x+half, y+half);
      popMatrix();
    }
  }

loadPixels(); 
  // Since we are going to access the image's pixels too  
  img.loadPixels(); 
  for (int y = 0; y < height; y++) {
    for (int x = 0; x < width; x++) {
      int loc = x + y*width;
      
      // The functions red(), green(), and blue() pull out the 3 color components from a pixel.
      float r = red(img.pixels[loc]);
      float g = green(img.pixels[loc]);
      float b = blue(img.pixels[loc]);
      
      // Image Processing would go here
      // If we were to change the RGB values, we would do it here, 
      // before setting the pixel in the display window.
      
      // Set the display pixel to the image pixel
      pixels[loc] =  color(r,g,b);          
    }
  }
  updatePixels();
int dim;

void setup() {
  size(640, 360);
  dim = width/2;
  background(0);
  colorMode(HSB, 360, 100, 100);
  noStroke();
  ellipseMode(RADIUS);
  frameRate(1);
}

void draw() {
  background(0);
  for (int x = 0; x <= width; x+=dim) {
    drawGradient(x, height/2);
  } 
}

void drawGradient(float x, float y) {
  int radius = dim/2;
  float h = random(0, 360);
  for (int r = radius; r > 0; --r) {
    fill(h, 90, 90);
    ellipse(x, y, r, r);
    h = (h + 1) % 360;
  }
}

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