/**
 * Traffic Light (v3.0)
 * by Stephen o'Connor (2013/Jan)
 *
 * http://forum.processing.org/topic/traffic-light-functions-help
 */

PImage bg;

void setup() {
  size(700, 550);
  smooth();
  frameRate(50);

  rectMode(CORNER);
  imageMode(CORNER);

  background(0);
  bg = loadImage("background.png"); // Street background image
  image(bg, 0, 0, width, height);

  fill(50); // Colour of traffic light pole/hanger
  rect(200, 125, width-50, 40); // Position of traffic light pole/hanger

  rectMode(CENTER);
  ellipseMode(CENTER);

  fill(242, 201, 0); // Traffic light box colour
  rect(350, 225, 125, 275); // Position of traffic light box

  drawTrafficLight( 350, 140, 75, color(90, 25, 15) ); // Unlit red stop light
  drawTrafficLight( 350, 225, 75, color(40, 30, 10) ); // Unlit yellow stop light
  drawTrafficLight( 350, 310, 75, color(0, 0100, 0) ); // Unlit green stop light

  bg = get();  // Store reference to current canvas buffer
}

void draw() {
  background(bg);
  turnLightOn();
}

void turnLightOn() {
  if (mouseX > 312 && mouseX < 388 && mouseY > 102 && mouseY < 178)
    drawTrafficLight( 350, 140, 75, color(240, 20, 10) ); // Lit red stop light

  else if (mouseX > 312 && mouseX < 388 && mouseY > 187 && mouseY < 263)
    drawTrafficLight( 350, 225, 75, color(225, 250, 5) ); // Lit green stop light

  else if (mouseX > 312 && mouseX < 388 && mouseY > 272 && mouseY < 348)
    drawTrafficLight( 350, 310, 75, color(55, 255, 20) ); // Lit blue stop light
}

void drawTrafficLight(int x, int y, int sz, color colour) {
  fill(colour); // Unlit stop light
  ellipse(x, y, sz, sz); // Position of stop light
}