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It's better to do INBOUNDS_VEC(i, obj.entities) instead of 'i > -1'. 'i > -1' is used in cases like obj.getplayer(), which COULD return a sentinel value of -1 and so correct code will have to check that value. However, I am now of the opinion that INBOUNDS_VEC() should be used and isn't unnecessary. Consider the case of the face() script command: it's not enough to check i > -1, you should read the routine carefully. Because if you look closely, you'll see that it's not guaranteed that 'i' will be initialized at all in that command. Indeed, if you call face() with invalid arguments, it won't be. And so, 'i' could be something like 215, and that would index out-of-bounds, and that wouldn't be good. Therefore, it's better to have the full bounds check instead of checking only one bounds. Many commands are like this, after some searching I can also name position(), changemood(), changetile(), changegravity(), etc. It also makes the code more explicit. Now you don't have to wonder what -1 means or why it's being checked, you can just read the 'INBOUNDS' and go "oh, that checks if it's actually inbounds or not".
This is the source code to VVVVVV, version 2.0+. For more context about this release, see the announcement on Terry's blog!
License
VVVVVV's source code is made available under a custom license. See LICENSE.md for more details.
In general, if you're interested in creating something that falls outside the license terms, get in touch with Terry and we'll talk about it!
Authors
- Created by Terry Cavanagh
- Room Names by Bennett Foddy
- Music by Magnus Pålsson
- Metal Soundtrack by FamilyJules
- 2.0 Update (C++ Port) by Simon Roth
- 2.2 Update (SDL2/PhysicsFS/Steamworks port) by Ethan Lee
- Beta Testing by Sam Kaplan and Pauli Kohberger
- Ending Picture by Pauli Kohberger
Versions
There are two versions of the VVVVVV source code available - the desktop version (based on the C++ port, and currently live on Steam), and the mobile version (based on a fork of the original flash source code, and currently live on iOS and Android).