# My side scroller has a problem finding where the ground is
**URL:** https://discourse.processing.org/t/my-side-scroller-has-a-problem-finding-where-the-ground-is/33444
**Category:** Coding Questions
**Created:** [November 10, 2021, 5:31pm UTC](https://discourse.processing.org/t/my-side-scroller-has-a-problem-finding-where-the-ground-is/33444 "2021-11-10T17:31:16Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@DividedRabbit](https://discourse.processing.org/u/DividedRabbit)
#### Post date: [November 10, 2021, 5:31pm UTC](https://discourse.processing.org/t/my-side-scroller-has-a-problem-finding-where-the-ground-is/33444/1 "2021-11-10T17:31:16Z")
[https://drive.google.com/drive/folders/1qZGnHtEltQCCeqCsDzOSHIyZKUQMSOJt?usp=sharing](https://drive.google.com/drive/folders/1qZGnHtEltQCCeqCsDzOSHIyZKUQMSOJt?usp=sharing)
Here is the drive with all of my code. I am trying to use a linear equation to determine the height of the ground, but for some reason my ball is always too high or too low.
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### Author:  [@UnusualUsual](https://discourse.processing.org/u/UnusualUsual)
#### Post date: [November 10, 2021, 5:36pm UTC](https://discourse.processing.org/t/my-side-scroller-has-a-problem-finding-where-the-ground-is/33444/2 "2021-11-10T17:36:02Z")
First, it would help if you posted the code as text where exactly you are doing your ground collisions, and second, I’m just guessing if you’re using pre-made equations to check for collisions, it might not be the equations that are wrong, and you might just be handling modes incorrectly.
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### Author:  [@DividedRabbit](https://discourse.processing.org/u/DividedRabbit)
#### Post date: [November 10, 2021, 7:18pm UTC](https://discourse.processing.org/t/my-side-scroller-has-a-problem-finding-where-the-ground-is/33444/3 "2021-11-10T19:18:46Z")
if (carl.charX \> 4000 || carl.charX \< -2000) {
y = m\*(carl.charX - (2000\*block))+(rHeight+save); //Equation for the height of the ground
}
else {y = rHeight;}
Here is how I determine the height of the ground. I have the if statement because the first 3 blocks are flat at 1500 (rHeight). My equation for m is:
m = (((rHeight+save)-(rHeight+newRand))/(-2000));
Save is the height of the first point in the block, newRand is the height of the end. The block is 2000 pixels wide, so I have -2000 underneath.
Basically I’m using y=mx+b where x is the x of the ball.
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### Author:  [@UnusualUsual](https://discourse.processing.org/u/UnusualUsual)
#### Post date: [November 11, 2021, 3:09am UTC](https://discourse.processing.org/t/my-side-scroller-has-a-problem-finding-where-the-ground-is/33444/4 "2021-11-11T03:09:10Z")
What is carl? I’m not seeing that class in the code you added to your drive. It would also help if you wrapped the code in \ preformatted text, seen in the editor’s window.
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### Author:  [@DividedRabbit](https://discourse.processing.org/u/DividedRabbit)
#### Post date: [November 11, 2021, 6:41am UTC](https://discourse.processing.org/t/my-side-scroller-has-a-problem-finding-where-the-ground-is/33444/5 "2021-11-11T06:41:16Z")
carl is from the class of My\_Guy, so it is his x and y I am tracking. and apologies, I’m new to this.
```auto
if (carl.charX > 4000 || carl.charX < -2000) {
y = m*(carl.charX - (2000*block))+(rHeight+save); //Equation for the height of the ground
}
else {y = rHeight;}
m = (((rHeight+save)-(rHeight+newRand))/(-2000));
```