function setup(){
// executed once
  createCanvas(windowWidth, windowHeight);
  background(80);
  fill(70);
  rect(width/2, 0, width/2, height);
}


function draw(){
// executed all the time


  for(var x = 0; x < width; x+=10) {
    for(var y = 0; y < height; y+=10){
      if (x < width/2) {
        if (mouseX < width/2){
          stroke(255, 80, 80);
        } else {
          stroke(0);
        }
      } else {
        if (mouseX > width/2){
          stroke(80, 255, 80);
        } else {
          stroke(255);
        }
      }

      strokeWeight(4);
      point(x,y);
    }
  }

}


function windowResized(){
  resizeCanvas(windowWidth, windowHeight);
}