Release Gravity

float x = 0;   // x location of square

float y = 0;     // y location of square

float speed = 0;   // speed of square

boolean isGravity = true;

float gravity = 0.3;  

​

void setup() {

  fullScreen();

  x = width/2;

}

​

// if clicked, removes the gravity

void draw() {

  background(212, 221, 237);

  if (isGravity) {

    noStroke();

    fill(0, 34, 128);

  } else {

    noStroke();

    fill(255, 88, 94);

  }

  stroke(0);

  rectMode(CENTER);

  rect(x, y, 10, 10);

​

  // Add speed to location.

  y = y + speed;

​

  // Do things regarding to gravity

  if (isGravity) {

    // Add gravity to speed if gravity is present

    speed = speed + gravity;

    // bounce

    if (y > height) {

      // Multiplying by -0.95 instead of -1 slows the square down each time it bounces (by decreasing speed).  

      // This is known as a "dampening" effect and is a more realistic simulation of the real world (without it, a ball would bounce forever).

      speed = speed * -0.95;

      y = height;

    }

  } else {

    // simply go theough the borders

    if (y>height)

      y = 0;

    else if (y<0)

      y = height;

  }

​

  // nullify gravity

  if (keyPressed) {

    isGravity = !isGravity;

  }

}

​