Legacy GM [SOLVED?]Tile Collision

[Treecase86]

Hey. I've been working on a Sonic engine, and I've encountered a problem. I use tiles as the stage background and foreground. I have separate layers for the background and collision. Problem is, Sonic passes straight through the floor. See below for code.

///Jumping
var tileGround;
tileGround = tile_layer_find(1,x,y)

if tileGround == true
{
    grounded = true
}

if grounded == false
{
    //if off of ground, apply gravity
    ysp += grav
}

EDIT: I can shoerten it to just

///Jumping
var grounded;
grounded = tile_layer_find(1,x,y)
if grounded == false
{
    //if off of ground, apply gravity
    ysp += grav
}

could I not?

 

[Kahrabaa]

could I not?

Yes you could, the second one is better, has one if less.

Problem is, Sonic passes straight through the floor.

Make sure the tiles depth are the same in the editor and your code (1). If they are the same then maybe you forgot to stop sonic when he falls to the ground?
Like this

///Jumping
var grounded;
grounded = tile_layer_find(1,x,y)
if grounded == false
{
    //if off of ground, apply gravity
    ysp += grav
}
else
{ //if on ground stop vertical / y speed
    ysp=0;
}