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[Floorman]

Hello,

I can make small game confidently in Java, I know a fair amount of the basic theory and such (except the Math, I suck at the Math side of things) and I had one question.

I saw Notch coding Minicraft for LD22 and I saw that he used a single 256x256 px grid and draw icons onto the sheet and he was able to somehow take any icon he wanted and draw it somehow using bitwise operation.

How?

I also saw at the start he modified the pixels directly (DataBufferInt) and then drew another screen over it. Why? I don't get why that would be necessary but I am very interested with this method of loading images and I want to know how to do this.

Does anyone have any idea of how he is doing this?

Thanks,

[JMickle]

All LD entries are open-source as a rule, so you can actually go and grab the source code and find out from there!

[st33d]

Why? I don't get why that would be necessary

Because the competition has time constraints. By doing that he saved himself a lot of time making more sprites.

[Dacke]

Catacomb Snatch (also created by Mojang/Notch) uses the same approach (I think). The source code is available online, for example in an actively developed fork on github. The relevant code can be seen here:
https://github.com/Maescool/Catacomb-Snatch/tree/develop/src/com/mojang/mojam/screen

As the fork is active, you can also ask people (like me) about details regarding the implementation. Either here, in an issue at github or at the project's forums.