// Snowy Christmas Tree
// By Christan Shaw and Jacob Carey

/* Snow with a christmas tree and lights
When the user clicks, the lights on the tree changes */

//Snow Varibles
int number_of_snow = 100;
float[] snow_x = new float[number_of_snow];
float[] snow_y = new float[number_of_snow];
float snow_size = 5;
float snow_speed = 1;

//Tree Varibles
color light_colour = color(255, 0, 0);
boolean cycle_colours = false;
int cycle_rate = 15;
int r = 255;
int g = 0;
int b = 0;

void setup() {
 size(600,400);
 frameRate(60);
 background(52);

 // Snow Init
 for (int i=0; i < snow_x.length; i=i+1) { // Create random x cords
   snow_x[i] = random(1, width);
 }
 for (int i=0; i< snow_y.length; i=i+1) { // Create random y cords
   snow_y[i] = random(1, height);
 }
}

void draw_snow() { // Draws snow according to the varibles
  fill(255); // White snow with no stroke
  noStroke();
  for (int i=0; i < snow_x.length; i=i+1) { // Goes through the snow array to draw them
    ellipse(snow_x[i], snow_y[i], snow_size, snow_size); // Circle for the snow
  }
}

void update_snow() { // Adds 'snow_speed' to every snow_y, if the snow_y is lowwer than the lenght it then puts it at the top and puts a random x cord.
  for (int i=0; i < snow_y.length; i=i+1) {
    if (snow_y[i] >= height+5) {
     snow_y[i] = 0;
     snow_x[i] = random(1, width);
    } else {
      snow_y[i] = snow_y[i] + 1;
    }
  }
}

void draw_tree() {
  //Tree pieces
  fill(139, 69, 19); //Trunk Colour
  rect(265, 350, 70, 100); //Trunk
  fill(0, 255, 0); //Branches Colour
  triangle(300, 50, 250, 110, 350, 110); //Uppermost Branches
  triangle(300, 90, 210, 180, 390, 180); //Second to top Branches
  triangle(300, 150, 170, 270, 430, 270); //Third to top Branches
  triangle(300, 220, 130, 360, 470, 360); //Lowermost Branches
  fill(light_colour);
  stroke(2);
  circle(305, 70, 10);
  circle(280, 90, 10);
  circle(330, 140, 10);
  circle(320, 160, 10);
  circle(260, 150, 10);
  circle(265, 220, 10);
  circle(230, 240, 10);
  circle(360, 230, 10);
  circle(360, 300, 10);
  circle(210, 330, 10);
  circle(290, 320, 10);
}

void mouseClicked(){
  if(cycle_colours){
    cycle_colours = false;
    light_colour = color(255, 0, 0);
    r = 255;
    g = 0;
    b = 0;
  }
  else if(!cycle_colours){
    cycle_colours = true;
  }
}
void draw() {
  clear();
  background(52);

  //Tree
  draw_tree();

  //Snow
  draw_snow();
  update_snow();

  //Light Color Cycling

  if(cycle_colours){
    light_colour = color(r, g, b);
    if(r < 255 && g == 0 && b == 0){
      r += cycle_rate;
    }
    if(r == 255 && g < 255 && b == 0){
      g += cycle_rate;
    }
    if(r > 0 && g == 255 && b == 0){
      r -= cycle_rate;
    }
    if(r == 0 && g == 255 && b < 255){
      b += cycle_rate;
    }
    if(r == 0 && g > 0 && b == 255){
      g -= cycle_rate;
    }
    if(r < 255 && g == 0 && b == 255){
      r += cycle_rate;
    }
    if(r == 255 && g == 0 && b > 0){
      b -= cycle_rate;
    }
  }
}