void keyPressed() {
  if (key == 'w' || keyCode == UP) {
    wd = true;
  }
  if (key == 's' || keyCode == DOWN) {
    sd = true;
  }
  if (key == 'a' || keyCode == LEFT) {
    ad = true;
  }
  if (key == 'd' || keyCode == RIGHT) {
    dd = true;
  }
}
void keyReleased() {
  if (key == 'w' || keyCode == UP) {
    wd = false;
  }
  if (key == 's' || keyCode == DOWN) {
    sd = false;
  }
  if (key == 'a' || keyCode == LEFT) {
    ad = false;
  }
  if (key == 'd' || keyCode == RIGHT) {
    dd = false;
  }
}
void draw() {
  noStroke();
  background(0);
  //movement

  if (wd) {
    y-=speed;
  }
  if (sd) {
    y+=speed;
  }
  if (ad) {
    x-=speed;
  }
  if (dd) {
    x+=speed;
  }