Playing with dragon curve fractal

[mnrvovrfc]

Nice program, interesting concept. But on my computer I had to change `_KEYHIT` to `_KEYDOWN` to check only for escape key because it was doing only one iteration. I went further than that and it refused to work properly. I saw the `1e-8` being added to `p` and figured it would work better with double precision. So I set all variables to work in double precision but couldn't get further than one dot.