// Click within the image to change 
// the value of the rectangle 
 
int value = 0; 
 
void loop() { 
  fill(value); 
  rect(25, 25, 50, 50); 
} 
 
void mouseReleased() 
{ 
  if(value == 0) { 
    value = 255; 
  } else { 
    value = 0; 
  } 
}