function setup() {
createCanvas(400,400);
background(255);
strokeWeight(5);
fill(0);
line(200,0,200,400);
line(0,200,400,200);
}
function draw() {
if (mouseX < width/2 && mouseY < height/2){
fill(230,230,0);
rect(0,0,200,200);
}
if(mouseX > width/2 && mouseY > height/2){
fill(230,0,0);
rect(200,200,200,200);
}
if(mouseX > width/2 && mouseY < height/2){
fill(0,230,0);
rect(0,200,200,200);
}
if(mouseY < width/2 && mouseY > height/2){
fill(0,0,230);
rect(200,0,200,200);
}
}