Button - OpenProcessing

mySketch
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boolean C = false;
int x = 25;
int y = 250;
int buttonX;
int buttonY;
int buttonWidth = 50;
​
void setup() {
  size (500 , 500);
  background (0 , 0 , 0); 
  buttonX = 5*buttonWidth;
  buttonY = 5*buttonWidth;
​
}
​
void draw() {
if (dist (buttonX , buttonY , mouseX , mouseY) < buttonWidth/2){
    fill(0 , 255 , 0);
  } 
    else {
    fill(255 , 0 , 0);
  }
  ellipse(buttonX , buttonY , buttonWidth , buttonWidth);
  if ((mouseX < width/2) && (mouseY > height/2)){
  ellipse (width/4 , height/4 + height/2 , 50 , 50);
}
  if ((mouseX > width/2) && (mouseY < height/2)){
  ellipse (width/2 + width/4 , height/4 , 50 , 50);
}
  if ((mouseX < width/2) && (mouseY < height/2)){
  ellipse (width/4 , height/4 , 50 , 50);
}
  if ((mouseX > width/2) && (mouseY > height/2)){
  ellipse (width/2 + width/4 , height/2 + height/4 , 50 , 50);
}
​
if (C == true){
  fill (255 , 0 , 0);
  ellipse (y-2*x , y , x , x);
  ellipse (y+2*x , y , x , x);
  ellipse (y , y+2*x , x , x);
  ellipse (y , y-2*x , x , x);
  ellipse (y-x , y-x , x/2 , x/2);
  ellipse (y+x , y+x , x/2 , x/2);
  ellipse (y-x , y+x , x/2 , x/2);
  ellipse (y+x , y-x , x/2 , x/2);
  x = x + 1;
}
}
​
void mouseClicked(){
  if (dist (buttonX , buttonY , mouseX , mouseY) < buttonWidth/2){
  if (C == true){
    C = false; 
  } else {                        
    C = true;              
  }
  
}
}