/* 6.914, Example 4.A
 Using switch-case to change between screens.
 */

int counter = 1;

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

void draw(){
  switch (counter){
    case (1):
    background(255);
    stroke(0);
    line(0, 0, width, height);
    break;
    
    case(2):
    background(100);
    stroke(255);
    line(0, height, width, 0);
    break;
    
    case(3):
    background(0);
    stroke(255);
    line(0, height/2, width, height/2);
    break;
  }
}

void mousePressed(){
  if (mouseX < width/2){
    counter = max(1, counter-1); // don't go below 1
  } 
  else if (mouseX > width/2){
    counter = min(3, counter+1); // don't go above 3
  }
}