Stopping the game when touching sides pong game

Processing Coding Questions
1

Hi, I just need help trying to stop the game, if the ball touches the left or right side of the screen and not the paddles. here is my code:

int x,y,w,h,speedX,speedY;//circle variables
int paddleX, paddleY,paddlew,paddleH,paddleS,paddleX2,paddleY2,paddlew2,paddleH2,paddleS2;//left and right paddles variables
boolean up,down;//up down for right paddle
boolean positive, negative;//up down for left paddle
boolean a_pressed=false;//pauses game
boolean q_pressed=false;//unpauses game
int scoreL=0;
int scoreR=0;
void setup() {
  size(600,600);
  x=width/2;
  y=height/2;
  w=50;
  h=50;
  speedX=3;
  speedY=3;
  paddleX=570;
  paddleY=height/2;
  paddlew=30;
  paddleH=100;
  paddleS=5;
  paddleX2=10;
  paddleY2=height/2;
  paddlew2=30;
  paddleH2=100;
  paddleS2=5;
  
}
  void draw() {
background(0);
fill(224);
rect(paddleX,paddleY,paddlew,paddleH);
rect(paddleX2,paddleY2,paddlew2,paddleH2);
fill(255,0,0);
ellipse(x,y,w,h);
textSize(30);
fill(0,255,255);
text(scoreL,250,50);
text("L SCORE:",100,50);
text(scoreR,500,50);
text("R SCORE:",350,50);
  
//moving circle
x=x+speedX;
y=y+speedY;
//preventing it leaving screen
if(x>width-w/2){
  speedX=-speedX;
}else if(x<0+w/2) {
  speedX=-speedX;
}
if(y>height-h/2){
  speedY=-speedY;
}else if(y<0+h/20){
  speedY=-speedY;
}
//moving paddle
if(up) {
paddleY=paddleY+paddleS;
}
if(positive) {
  paddleY2=paddleY2+paddleS2;
}
if(down) {
  paddleY=paddleY-paddleS;
  }
if(negative) {
  paddleY2=paddleY2-paddleS2;
}
//preventing paddle from going off screen
if(paddleY-paddleH/2<0) {
  paddleY=paddleY+paddleS;
}
if(paddleY2-paddleH2/2<0) {
  paddleY2=paddleY2+paddleS2;
}
if(paddleY+paddleH/2>height) {
  paddleY=paddleY-paddleS;
}
if(paddleY2+paddleH2/2>height) {
  paddleY2=paddleY2-paddleS2;
}
//ball bouncing off paddle
if(x>paddleX - w/2 && x < paddleX+paddlew - w/2 && y < paddleY + paddleH + h/2 && y > paddleY - h/2) {
speedX=-speedX;
scoreR=scoreR+10;
}
if(x>paddleX2 + w/2 && x < paddleX2 + paddlew2 + w/2 && y < paddleY2 + paddleH2 + h/2 && y > paddleY2 - h/2) {
speedX=-speedX;
scoreL=scoreL+10;
}
//stop  game if ball touches the end of left and right sides without paddle contact

void keyPressed() {
  if(key=='d') {
    up=true;
  }
  if(key=='u') {
    down=true;
  }
  if(key=='m') {
    positive=true;
  }
  if(key=='p') {
    negative=true;
  }
  if(key=='a'){
  a_pressed=true;
  noLoop();
}
if(key=='q') {
  q_pressed=true;
  loop();
}
  }
void keyReleased() {
  if(key=='d') {
    up=false;
  }
  if(key=='u') {
    down=false;
  }
  if(key=='m') {
    positive=false;
  }
  if(key=='p') {
    negative=false;
  }
  if(key=='a'){
  a_pressed=true;
  noLoop();
}
if(key=='q') {
  q_pressed=true;
  loop();
}
}
1 Like
2

Hi,

Can you please format your code by using the </> button in the message editor on the forum? (You can press Ctrl+T in the Processing IDE to auto format your code :slight_smile: )

Because for now it’s actually impossible to read or copy into Processing to test it. (I already told you this on I need help to keep score)

And please do not post the same code on multiple threads, try to summarize your problem…
(Bouncing ball with paddle)
(I need help to keep score)
(Creating menu for game and touching sides pong game)

But testing if your ball touches left or right side is not complicated :

  • The location of your ball is described by x and y
  • It’s diameter is w and h (or just w because a ball is always circular in pong)
  • The left side of the screen is at coordinates [0, y] (y can be whatever)
  • The right side of the screen is at coordinates [width, y]

So in order to test if it touches the left wall, you test if the x coordinate of the ball is inferior (on the left side) to 0 (the left wall), you need to take into account the diameter of the ball (in fact it’s radius) :

boolean touchLeftWall(x, diameter){
  return (x - diameter / 2) <= 0;
}

This function returns a boolean (true or false) that tells if the ball hit the left wall. You can do the same for the right wall.

1 Like
3

Thanks, but where do put this boolean In the variable label or in void draw()?

4

In the draw() function, you are displaying your game each frame. In order to stop it, you can check if the ball touches either left or right wall and then call the noLoop() function which basically stop the draw loop :

void draw(){
  // Display your game

  // Stop the game if the ball touched the wall
  if(touchLeftWall(x, diameter) || touchRightWall(y, diameter)){
    noLoop();
  }
}
1 Like