/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://bard117s14.sketchpad.cc/sp/pad/view/ro.wHJP-iMpl4T/rev.13
 * 
 * authors: 
 *   Keith O'Hara

 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 



/*
 * Skeleton of a ball bouncing /game/.
 *
 * Keith O'Hara <[email protected]>
 * Feb 2014
 *
 */

float paddle_x;
float paddle_step;
float paddle_size = 16;

float ball_x, ball_y;
float ball_x_step, ball_y_step;
float ball_r = 13;

void setup() {
  size(600, 300);
  smooth();

  paddle_x = width/2;
  paddle_step = 0;

  reset();
}

void draw() {
  background(196);
  
  // move paddle
  paddle_x = paddle_x + paddle_step;
  //paddle_x = mouseX;
  

  // is the ball hitting the right or left wall?
  if (ball_x - ball_r < 0 || ball_x + ball_r > width) {
    ball_x_step = -ball_x_step;
  } 

  if (ball_y - ball_r < 0) {
    ball_y_step = -ball_y_step;
  } 

  if (ball_y + ball_r > height) {
    ball_y_step = -ball_y_step;
  }

  // move ball by ball_x_step and ball_y_step
  ball_x = ball_x + ball_x_step;
  ball_y = ball_y + ball_y_step;

  //draw ball
  noStroke();
  fill(196, 0, 0);
  ellipse(ball_x, ball_y, ball_r*2, ball_r*2);
}

void keyPressed() {
  if (keyCode == LEFT) {
    paddle_step = -3;
  }
  else if (keyCode == RIGHT) {
    paddle_step = 3;
  }
  else if (key == ' ') {
    reset();
  }
}

void keyReleased() {
  paddle_step = 0;
}

void reset() {
  ball_x = random(ball_r, width - ball_r);
  ball_y = random(ball_r, height/2 );
  ball_x_step = random(-3, 3);
  ball_y_step = random(1, 3);
}

void drawPaddle() {
  // draw paddle
  stroke(24);
  fill(64);
  rect(paddle_x, height-paddle_size, paddle_size*3, paddle_size);
}