# How can I make a program that hits balls in processing?
**URL:** https://discourse.processing.org/t/how-can-i-make-a-program-that-hits-balls-in-processing/25893
**Category:** Coding Questions
**Tags:** homework
**Created:** [December 2, 2020, 2:33pm UTC](https://discourse.processing.org/t/how-can-i-make-a-program-that-hits-balls-in-processing/25893 "2020-12-02T14:33:52Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@hahahajayden](https://discourse.processing.org/u/hahahajayden)
#### Post date: [December 2, 2020, 2:33pm UTC](https://discourse.processing.org/t/how-can-i-make-a-program-that-hits-balls-in-processing/25893/1 "2020-12-02T14:33:52Z")
> please format code with \ button \* [homework policy](https://discourse.processing.org/faq/#homework) \* [asking questions](https://discourse.processing.org/t/2147)
hello! I am a novice processing programmer living in Korea.
I used Google Translator, so I hope you understand even if the words are strange.
The problem I have is that the balls don’t bounce each other.
I made the ball move with the keyboard and mouse.
and I used PVector to create a program where a ball bounces off a wall.
But I can’t make it physically bounce when the balls hit each other.
this is my code.
Please help me!
PVector location; // Location of shape1
PVector location2; // Location of shape2
PVector location3; // Location of shape3
PVector velocity; // Velocity of shape1
PVector velocity2; // Velocity of shape2
PVector velocity3; // Velocity of shape3
PVector mouse;
int tumx=1,tumy=1,tumx2=1,tumy2=1,tumx3=1,tumy3;
int checkx=1, checky=1, yee=1, check2x=1, check2y=1, check3x=1, check3y=1;
void setup() {
size(1200,600);
```
location = new PVector(300,300);
location2 = new PVector(600,300);
location3 = new PVector(900,300);
velocity = new PVector(0,0);
velocity2 = new PVector(0,0);
velocity3 = new PVector(0,0);
mouse = new PVector(mouseX,mouseY);
```
}
void draw() {
```
background(150);
ellipse(mouseX,mouseY,20,20);
//first ball
location.add(velocity);
if ((location.x > width) || (location.x < 0)) {
velocity.x = velocity.x * -1;
}
if ((location.y > height) || (location.y < 0)) {
velocity.y = velocity.y * -1;
}
//second ball
location2.add(velocity2);
if ((location2.x > width) || (location2.x < 0)) {
velocity2.x = velocity2.x * -1;
}
if ((location2.y > height) || (location2.y < 0)) {
velocity2.y = velocity2.y * -1;
}
//third ball
location3.add(velocity3);
if ((location3.x > width) || (location3.x < 0)) {
velocity3.x = velocity3.x * -1;
}
if ((location3.y > height) || (location3.y < 0)) {
velocity3.y = velocity3.y * -1;
}
//start the first ball
if(keyPressed)
{
if(yee==1)
{
velocity.x=round((location.x-mouseX)/50);
velocity.y=round((location.y-mouseY)/50);
checkx=0;
checky=0;
yee=0;
}
}
// if the ball collide
//if((location2.x-location.x)*(location2.x-location.x)+(location2.y-location.y)*(location2.y-location.y)<=9216.5 && 9215.5<=(location2.x-location.x)*(location2.x-location.x)+(location2.y-location.y)*(location2.y-location.y))
if(location.dist(location2)<2304)
{
}
if(location.dist(location2)<2304)
{
}
if(location.dist(location2)<2304)
{
}
//make the ball slower
ball();
//draw a ball
stroke(0);
strokeWeight(2);
fill(255);
ellipse(location.x,location.y,48,48);
fill(225,0,0);
ellipse(location2.x,location2.y,48,48);
fill(225,225,0);
ellipse(location3.x,location3.y,48,48);
```
}
void ball()
{
if(checkx==0 || checky==0 || check2x==0 || check2y==0 || check3x==0 || check3y==0)
{
//ball1
velocity.x=(velocity.x)\*0.995;
text("X : "+nfc(velocity.x,1), 100, 100);
if(-0.1\
### Author:  [@noel](https://discourse.processing.org/u/noel)
#### Post date: [December 2, 2020, 4:07pm UTC](https://discourse.processing.org/t/how-can-i-make-a-program-that-hits-balls-in-processing/25893/2 "2020-12-02T16:07:39Z")
Hi @hahahajayden
See here a tutorial about multiple objects bouncing. Just remove gravity.
> **[BouncyBubbles \\ Examples \\ Processing.org](https://processing.org/examples/bouncybubbles.html)**
---
### Author:  [@hahahajayden](https://discourse.processing.org/u/hahahajayden)
#### Post date: [December 3, 2020, 12:57am UTC](https://discourse.processing.org/t/how-can-i-make-a-program-that-hits-balls-in-processing/25893/3 "2020-12-03T00:57:39Z")
Thanks for answering the question!
---
### Author:  [@noel](https://discourse.processing.org/u/noel)
#### Post date: [December 3, 2020, 10:16am UTC](https://discourse.processing.org/t/how-can-i-make-a-program-that-hits-balls-in-processing/25893/4 "2020-12-03T10:16:58Z")
I guess you wrote this because you want a direct answer to your code.
Honestly I tried to copy your code, but that came with a lot of (copy) errors. A single extra period in a code will prevent it to run, so I recommend learning first how to format a post correctly.
---
### Author:  [@hahahajayden](https://discourse.processing.org/u/hahahajayden)
#### Post date: [December 4, 2020, 12:00am UTC](https://discourse.processing.org/t/how-can-i-make-a-program-that-hits-balls-in-processing/25893/5 "2020-12-04T00:00:29Z")
Thank you! I will refer to it in the future.
And I completed the program with your help.
Thank you so much!