Numpy+images

[tcld]

This makes more use of numpy, even though only for the exports (and those don't take too much time anyway). I also put some work into the GDAL export() method; there might have been a bug or two and I wanted to give worldengine the opportunity to make use of more of the formats GDAL supports. (Even though I don't like GDAL since it was a pain to install. I created an instruction, though. Maybe it can be added somewhere.)

In draw.py I added an import for the PyPNG-library which is used to export 16 Bit grayscale images.

All of this is based on this #138 and there may be some things in here that need a bit of discussion. Due to some of the changes and the connection to #138 this will not pass the tests for now.

EDIT: Oh, Travis doesn't know the PyPNG-module I imported. Well, this still needs a tiny bit of polish. :)

[psi29a]

The _equal code doesn't seem to be used by the WE library. Can this be moved __init__.py in tests?

[tcld]

It is also used as World.operator== - I am not sure if there are any world-comparisons in the code outside of the tests. But I guess it is worth a try and the code can be moved, yes.

[tcld]

On second thought the removal would leave the world-class without a functioning equality-operator. At the same time it is not only usable for that class... I wouldn't feel good about moving this to the tests, I prefer it here. (I found quite a lot of functions spread over various files that are never called or even referenced... maybe it is time for a bit of cleanup, though.)

[tcld]

@psi29a If you want to look at the code, you should probably start with the branch this is based on (#138) unless you want to verify it all at once.

[psi29a]

You'll need to add PyPNG to tox.ini

[tcld]

Ok, thanks. Since this #144 (comment) is now merged, I should probably rename the worldengine-data files to fit the new format (py3_seed...). I was away all day and didn't manage to do it before I left. I will finish everything up as soon as possible and hopefully the tests will run fine again. :)

[tcld]

This is going to be broken down into pure numpy-rewrites of parts of the image-code #161, a rework of the GDAL export #159 and the 16 Bit grayscale heightmaps I promised somewhere (that branch is not yet fully separated; no PR for now).