int x = 10;
int y = 300;
boolean movingRight, movingLeft, movingUp, movingDown = false;


void setup() {
  background(0, 255, 255);
  fullScreen();
}
void draw() {
  background(0, 255, 255);
  ellipse(x, y, 50, 50);
  moveUp();
  moveRight();
  moveLeft();
  moveDown();
}
void moveUp() {
  if (movingUp){
    y-=1;
  }
}
void moveDown(){
  if (movingDown){
    y+=1;
  }
}
void moveLeft(){
  if (movingLeft){
    x-=1;
  }
}
void moveRight(){
  if (movingRight){
    x+=1;
  }
}
void keyPressed(){
  if (key == 'w') {
    movingUp = true;
  }
  if (key == 's') {
    movingDown = true;
  }
  if (key == 'a') {
    movingLeft = true;
  }
  if (key == 'd') {
    movingRight = true;
  }
}

void keyReleased(){
  if (key == 'w') {
    movingUp = false;
  }
  if (key == 's') {
    movingDown = false;
  }
  if (key == 'a') {
    movingLeft = false;
  }
  if (key == 'd') {
    movingRight = false;
  }
}