Can someone explain this code to me?

Solar2D General Questions/Discussion
#1

so i have this onCollision code and it includes object:applyForce code… 

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So when the circle collides with the box ; it pushes the box …

But im not 100% sure on how it works and what it means…

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This code above is the one i need help understanding…

ill tell you what i do know…

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in the code above the event.other.x and the event.other.y prevents the box from spinning freely…

What i dont know is why in this code below

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why is the event.other subtracted from self.x and self.y…

Thanks for anyone who helps!

#2

Hi @SonicX278,

Let’s just consider the x aspect as an example. Imagine if, when the objects collide, the circle (“self”) is at x=200, and the box (“event.other”) is at x=220. Doing the math in that example, it works out to 220-200=20. So, the force of 20 is applied to the center of the box, which should correctly send the box moving to the right.

Consider other examples as well, using similar values:

  1. Circle is to the right of the box on collision: 200-220=-20, sending the box moving to the left.

Or for the y aspects:

  1. Circle is above the box on collision: 220-200=20, sending the box moving downward.

  2. Circle is below the box on collision: 200-220=-20, sending the box moving upward.

Hope this helps,

Brent

#3

Ahhhh i see Thanks a ton @Brent! 

#4

Why did you remove the code?  now this post is not of much use to anyone.

#5

The code wasn’t going to be of much use to anyone anyways… So I spared y’all the trouble and removed it. I mean if you want it I’ll post it when I have time… I’m on vacation… And usually replying to posts on my phone…

#6

In the future, please leave the previous posts in tact. People searching for threads will find this and be confused.

Rob

#7

I guess that’s true, I’ll repost the code when I have time!!

#8

Hi @SonicX278,

Let’s just consider the x aspect as an example. Imagine if, when the objects collide, the circle (“self”) is at x=200, and the box (“event.other”) is at x=220. Doing the math in that example, it works out to 220-200=20. So, the force of 20 is applied to the center of the box, which should correctly send the box moving to the right.

Consider other examples as well, using similar values:

  1. Circle is to the right of the box on collision: 200-220=-20, sending the box moving to the left.

Or for the y aspects:

  1. Circle is above the box on collision: 220-200=20, sending the box moving downward.

  2. Circle is below the box on collision: 200-220=-20, sending the box moving upward.

Hope this helps,

Brent

#9

Ahhhh i see Thanks a ton @Brent! 

#10

Why did you remove the code?  now this post is not of much use to anyone.

#11

The code wasn’t going to be of much use to anyone anyways… So I spared y’all the trouble and removed it. I mean if you want it I’ll post it when I have time… I’m on vacation… And usually replying to posts on my phone…

#12

In the future, please leave the previous posts in tact. People searching for threads will find this and be confused.

Rob

#13

I guess that’s true, I’ll repost the code when I have time!!