I see a lot of GD tutorials for PHP, even though GD was written in C, not PHP. Could you please suggest any good tutorial for GD in C?
A bit of googling turned up nothing for me either - this is one of those things, for now anyway, that you must study the API reference and make up your own toy test programs.
I'm making this, which might reasonably be a comment, an answer so that it doesn't get lost in a cloud of comments. It's a very high quality user guide: clear, complete, and correct with full code examples.
The outstanding doc is here: http://www.boutell.com/gd/manual2.0.33.html .
来源：https://stackoverflow.com/questions/2027661/looking-for-gd-tutorial-in-c-c