Test the position and collision of an object

[Raydenn]

Hi, i'm making my first game and i want to change the speed vertical of an object if he touch another object and at an y position.
I know it's probably easy to do but i don't know how to do it, and also sorry for my bad english i'm not english.
I hope you can help me.

 

[Aura]

A diagram might help you with illustrating what you want.

 

[Raydenn]

A diagram might help you with illustrating what you want.

Thank you, i will do this, but you know how to detect if an object doesn't touch another object.

 

[Aura]

Use the ! (not) operator along with a collision detection function.

if (!place_meeting(x, y, obj_Bud)) {
   // Do something...
}