Catch the Flag - OpenProcessing

mySketch
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int [] position = new int[4];
​
float r = 0;
float b = 0;
float g = 0;
​
void setup() {
  size(1000, 1000);
  
  position[0] = 0;
  position[1] = 250;
  position[2] = 500;
  position[3] = 750;
  frameRate(5);
}
​
void draw() {
  // Color the background and draw lines to divide the window in quadrants.
  background(r,g,b);  
  stroke(255);
  int w = width;
  int h = height;
  for(int i = 0; i < 4; i++){
    line(250*i,0,250*i,height);
    line(0,250*i,width,250*i);
  }
  
  // If the mouse is on the right hand side of the window, increase red.  
  // Otherwise, it is on the left hand side and decrease red.
  if (mouseX > width/2) {
    r = r + 1; 
  } else {
    r = r - 1;
  }
  
  // If the mouse is on the bottom of the window, increase blue.  
  // Otherwise, it is on the top and decrease blue.
  if (mouseY > height/2) {
    b = b + 1; 
  } else {
    b = b - 1; 
  }
  
  float x = position[int(random(0,4))];
  float y = position[int(random(0,4))];
  fill(255);
  rect(x, y, 250, 250);
  
  if((mouseX > x && mouseX < x+250) && (mouseY > y && mouseY < y+250)){
    fill(200,220,120); 
    ellipse(x+125,y+125,100,100);
  }
​
  // Constrain all color values to between 0 and 255.
  r = constrain(r,0,255);
  g = constrain(g,0,255);
  b = constrain(b,0,255);
}