# Stopping the game when touching sides pong game
**URL:** https://discourse.processing.org/t/stopping-the-game-when-touching-sides-pong-game/21810
**Category:** Coding Questions
**Created:** [June 12, 2020, 4:31pm UTC](https://discourse.processing.org/t/stopping-the-game-when-touching-sides-pong-game/21810 "2020-06-12T16:31:27Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@mrporcessing](https://discourse.processing.org/u/mrporcessing)
#### Post date: [June 12, 2020, 4:31pm UTC](https://discourse.processing.org/t/stopping-the-game-when-touching-sides-pong-game/21810/1 "2020-06-12T16:31:27Z")
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:
```auto
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();
}
}
```
---
### Author:  [@josephh](https://discourse.processing.org/u/josephh)
#### Post date: [June 12, 2020, 5:14pm UTC](https://discourse.processing.org/t/stopping-the-game-when-touching-sides-pong-game/21810/2 "2020-06-12T17:14:29Z")
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 🙂 )
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](https://discourse.processing.org/t/i-need-help-to-keep-score/21724/3))
**And please do not post the same code on multiple threads, try to summarize your problem…**
([Bouncing ball with paddle](https://discourse.processing.org/t/bouncing-ball-with-paddle/21798))
([I need help to keep score](https://discourse.processing.org/t/i-need-help-to-keep-score/21724))
([Creating menu for game and touching sides pong game](https://discourse.processing.org/t/creating-menu-for-game-and-touching-sides-pong-game/21821))
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) :
```auto
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.
---
### Author:  [@mrporcessing](https://discourse.processing.org/u/mrporcessing)
#### Post date: [June 12, 2020, 6:28pm UTC](https://discourse.processing.org/t/stopping-the-game-when-touching-sides-pong-game/21810/3 "2020-06-12T18:28:33Z")
Thanks, but where do put this boolean In the variable label or in void draw()?
---
### Author:  [@josephh](https://discourse.processing.org/u/josephh)
#### Post date: [June 13, 2020, 10:48am UTC](https://discourse.processing.org/t/stopping-the-game-when-touching-sides-pong-game/21810/4 "2020-06-13T10:48:27Z")
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()`](https://processing.org/reference/noLoop_.html) function which basically stop the draw loop :
```auto
void draw(){
// Display your game
// Stop the game if the ball touched the wall
if(touchLeftWall(x, diameter) || touchRightWall(y, diameter)){
noLoop();
}
}
```