http://lodev.org/cgtutor/


http://www.netgraphics.sk/en


http://members.chello.at/~easyfilter/bresenham.html


http://e-collection.library.ethz.ch/eserv/eth:30768/eth-30768-02.pdf


https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm


http://members.chello.at/~easyfilter/Bresenham.pdf


http://www.p_w_picpathmagick.org/Usage/color_basics/