float theta = 0;
float delta = 0.05;

void setup() {
  size(400, 400);
  frameRate(30);
  smooth();
}

void draw() {
  background(255);
  
  translate(mouseX, mouseY);
  rotate(theta);
  
  rectMode(CENTER);
  noStroke();
  fill(240, 32, 32);
  rect(0, 0, 90, 90);
  
  pushMatrix();
  fill(240, 128, 128);
  translate(120, 0);
  rotate(theta);
  rect(0, 0, 45, 45);
  popMatrix();
  
  pushMatrix();
  fill(240, 128, 128);
  translate(-120, 0);
  rotate(theta);
  rect(0, 0, 45, 45);
  
  pushMatrix();
  fill(240, 192, 192);
  translate(-45, 0);
  rotate(theta);
  rect(0, 0, 20, 20);
  popMatrix();
  
  popMatrix();
  
  theta += delta;
    
}