Follow-up Comment #8, bug #21735 (project mypaint):
The awesome Keith Scherb helped me figure this one out. It is almost
ridiculous how simple the code is now. Please give this a shot. Seems to
work great. Here are the changes needed in brushlib/mypaint-brush.c:
tilt_ascension = 180.0*atan2(-xtilt, ytilt)/M_PI;
//float e;
//if (abs(xtilt) > abs(ytilt)) {
//e = sqrt(1+ytilt*ytilt);
//e = abs(ytilt);
//} else {
//e = sqrt(1+xtilt*xtilt);
//e = abs(xtilt);
//}
const float rad = hypot(xtilt, ytilt);
//float cos_alpha = rad/e;
//if (cos_alpha >= 1.0) cos_alpha = 1.0; // fix numerical inaccuracy
//tilt_declination = 180.0*acos(cos_alpha)/M_PI;
tilt_declination = 90-(rad*60);
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