# Juggling Game Bug
**URL:** https://discourse.processing.org/t/juggling-game-bug/24172
**Category:** Coding Questions
**Created:** [September 27, 2020, 7:52pm UTC](https://discourse.processing.org/t/juggling-game-bug/24172 "2020-09-27T19:52:36Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@FloorBean](https://discourse.processing.org/u/FloorBean)
#### Post date: [September 27, 2020, 7:52pm UTC](https://discourse.processing.org/t/juggling-game-bug/24172/1 "2020-09-27T19:52:36Z")
Hello, I am experiencing a weird bug in my game where the ball seems to get caught in a conditional that throws it out of my display screen. I am not really sure why this is happening because my logic seems to be correct. The game is supposed to be like juggling where you try to survive with a score above 0 as long as possible. Let me know if you have any ideas on why this might be happening.
```auto
ball b1;
ball b2;
int score = 0;
void setup(){
size(500,500);
b1 = new ball(random(0,width),random(0,height),1,1,color(random(0,255),0,random(0,255)),40);
b2 = new ball(random(0,width),random(0,height),1,1,color(random(0,255),0,random(0,255)),40);
}
void draw(){
background(255);
textSize(20);
fill(0);
text("Score:" +score,20,40);
b1.display();
b1.move();
b1.edges();
b2.display();
b2.move();
b2.edges();
b1.score();
b2.score();
//b1.miss();
//b2.miss();
}
// Classes start with a capital letter.
class ball{
float x;
float y;
float dx;
float dy;
color rcolor;
float size = 40;
ball(float x, float y, float dx, float dy,color rcolor, float size){
this.x=x;
this.y=y;
this.dx=dx;
this.dy=dy;
this.rcolor=rcolor;
this.size=size;
}
void display(){
fill(rcolor);
circle(x,y,size);
}
void move(){
x=x+dx;
y=y+dy;
}
void edges(){
if(x>width || x<0){
if(dx>0){
dx-=0.5;
}
else{
dx+=0.5;
}
dx = dx *-1;
score--;
}
else if (y>height || y<0){
if(dy>0){
dy -=0.5;
}
else{
dy+=0.5;
}
dy = dy *-1;
score--;
}
}
void score(){
if(mousePressed && mouseX>=x-size/2 && mouseX<=x+size/2 && mouseY>=y-size/2 && mouseY<=y+size/2){
dy= abs(dy)+0.5;
dx= abs(dx)+0.5;
//Only goes faster when x and y cords increase
rcolor = color(random(0,255),0,random(0,255));
score = score +5;
}
}
}
```
---
### Author:  [@Chrisir](https://discourse.processing.org/u/Chrisir)
#### Post date: [September 27, 2020, 8:03pm UTC](https://discourse.processing.org/t/juggling-game-bug/24172/2 "2020-09-27T20:03:23Z")
> [@FloorBean](#):
>
> `dx = dx *-1;`
Shouldn’t this be inside the if clause?
It’s Ball with a capital B 😉
---
### Author:  [@FloorBean](https://discourse.processing.org/u/FloorBean)
#### Post date: [September 27, 2020, 8:47pm UTC](https://discourse.processing.org/t/juggling-game-bug/24172/4 "2020-09-27T20:47:16Z")
it seems to be happening when the ball hits a corner
---
### Author:  [@Chrisir](https://discourse.processing.org/u/Chrisir)
#### Post date: [September 27, 2020, 8:47pm UTC](https://discourse.processing.org/t/juggling-game-bug/24172/5 "2020-09-27T20:47:39Z")
> [@FloorBean](#):
>
> I am pretty sure it is inside the if clause.
my apologies.
Anyway, you check both edges at one time:
```auto
if(x>width || x<0){
```
This can lead to errors!
I always change this and test separately :
```auto
if(x>width){
if(x<0){
```
then the what you do is :
```auto
if(x>width){
dx = - abs (dx); // always neg !!
if(x<0){
dx = abs (dx); // always pos !!
```
That’s better!
Chrisir