Tree and apple with function and gravity

float appleY;

PImage tree;

PImage apple;

boolean harvestTime;

​

float speed = 0;

float gravity = 0.2;

​

void setup() {

  size(500, 500);

  appleY = 40;

  speed = 2;

  tree = loadImage("tree.png");

  apple=loadImage("apple.png");

  harvestTime = false;

}

​

void draw() {

  background(40, 200, 245);

  image(tree, 0, 0, 358, 500);

  image(apple, 250, appleY, 155, 160);

  if (harvestTime == true){

    // this next line calls the appleFalls() function

    appleFalls();

  }

  if (harvestTime == false){

    // do nothing

    // this if-statement is not actually necessary

  }

}

​

void appleFalls(){

  appleY = appleY + speed;

  // constantly adding gravity to speed means the y-position

  // causes the y-position of the apple to increase

  speed = speed + gravity;

  if (appleY > height - apple.height) {

    println("hit bottom");

    appleY = height - apple.height;

    // multiplying speed by -0.75 means the apple will bounce

    // a tiny bit less each time

    speed = speed * -0.75;

  }

  // if you hate the tiny bouncing at the end

  if (appleY > height - apple.height-4 && speed < 0.5 && speed > -0.5){

    speed = 0;

    appleY = height - apple.height;

  }

}

​

void mouseClicked(){

  harvestTime = true;

}

​

​