fixed, fixed RotatePoint(fixed x, fixed y, fixed originX, fixed originY, angle angle)
angle - a fixed-point ZDoom angle (not degrees or radians)
This function returns multiple values.
Returns the 2D point rotated around the origin by angle.
RotatePoint(x, y, originX, originY, angle); int newX = r1; int newY = r2;
RotateVector