// Stuff that bounces
// Variables & Basic Ifs

//A float is a decimal, just makes the movement of the block smoother
float x, y;
float sx, sy;

void setup() {
  size(500, 500);
  x = 250; //Start position for the block
  y = 250;

  sx = 0; //Start speed of the block
  sy = 0;
}


void draw() {
  fill(0, 0, 0);
  rect(0, 0, width, height); //The background

  fill(255, 0, 0); //The color of the block
  rect(x, y, 30, 30); //Draw the block that blounces
  
  sx = sx + 0.1; //Provides the acceleration to change the speed
  x = x + sx;    //Makes the position change based on the speed

  //Right bounce and position correction
  if (x > width - 30) { 
    sx = sx * (-0.9); //Bounce!, I picked 0.9 so it would lose a bit of its speed each bounce
    x = width - 30;  //This keeps it from getting "stuck" in the edge of the screen
  } 
  
  //Left bounce and position correction
  if (x < 0) {
    sx = sx * (-0.9); //Exactly the same deal as above
    x = 0; //Also, keeps it from getting "stuck" by moving it off the wall a bit
  }
  
  //I leave the copy and paste of the X coordinate stuff to make the Y coordinate stuff 
  //up to you.  Its like some kind of work at home
}