void setup(){
  size(200,200);
}

void draw(){
  background(0);
  
   stroke(255);
  line(50,0,50,200);
  line(100,0,100,200);
  line(150,0,150,200);
  line(0,50,200,50);
  line(0,100,200,100);
  line(0,150,200,150);
  
  //1ère ligne
  //1er carré
  if(mouseX>0 || mouseX<50 && mouseY>50){
    fill(255,0,0);
    rect(0,0,50,50);
    }
    if (mousePressed){
    fill(0,0,255);
    rect(0,0,50,50);
    }

  //2eme carré
  if(mouseX>50 || mouseX<100 && mouseY>50){
    fill(255,0,0);
    rect(50,0,50,50);
        fill(0,0,0);
    rect(0,0,50,50);
    if (mousePressed){
    fill(0,0,255);
    rect(50,0,50,50);
  }
  }
  //3eme carré
  if(mouseX>100 || mouseX<150 && mouseY>50){
    fill(255,0,0);
    rect(100,0,50,50);
        fill(0,0,0);
    rect(0,0,50,50);
    rect(50,0,50,50);
    if (mousePressed){
    fill(0,0,255);
    rect(100,0,50,50);
  }
  }
  
  //4eme carré
  if(mouseX>150 || mouseX<200 && mouseY>50){
    fill(255,0,0);
    rect(150,0,50,50);
        fill(0,0,0);
    rect(0,0,50,50);
    rect(50,0,50,50);
    rect(100,0,50,50);
     if (mousePressed){
    fill(0,0,255);
    rect(150,0,50,50);
  }
  }
  
  //2eme ligne
   //1er carré
   if(mouseX>0 || mouseX<50 && mouseY>50 || mouseY<100){
      fill(255,0,0);
      rect(0,50,50,50);
  
}}