It's a lot of code to go through, so I just skimmed it, but this looks suspicious:

Bitmap *bitmap;
...
    tex = bitmap->loadTexture("Practice.bmp");

I don't see you ever initializing bitmap. My guess is that it's an invalid pointer and you aren't setting it/allocating a Bitmap. Perhaps it shouldn't be a pointer and should just be a regular Bitmap instead of a Bitmap*? I see no reason to make it a pointer. I'm also unsure of why you made bitmap and tex global variables instead of member variables of Editor...
 
But yes, as fastcall22 said, now would be a great time to get familiar with your debugger.

It's a lot of code to go through, so I just skimmed it, but this looks suspicious:

Bitmap *bitmap;
...
    tex = bitmap->loadTexture("Practice.bmp");

I don't see you ever initializing bitmap. My guess is that it's an invalid pointer and you aren't setting it/allocating a Bitmap. Perhaps it shouldn't be a pointer and should just be a regular Bitmap instead of a Bitmap*? I see no reason to make it a pointer.
 
But yes, as fastcall22 said, now would be a great time to get familiar with your debugger.

It's a lot of code to go through, so I just skimmed it, but this looks suspicious:

 
Bitmap *bitmap;
...
    tex = bitmap->loadTexture("Practice.bmp");

I don't see you ever initializing bitmap. My guess is that it's an invalid pointer and you aren't setting it/allocating a Bitmap. Perhaps it shouldn't be a pointer and should just be a regular Bitmap instead of a Bitmap*? I see no reason to make it a pointer.
 
But yes, as fastcall22 said, now would be a great time to get familiar with your debugger.

It's a lot of code to go through, so I just skimmed it, but this looks suspicious:

 
</p><div>Bitmap *bitmap;</div>
<div>...</div>
<div>    tex = bitmap->loadTexture("Practice.bmp");</div>
<div>