def drawLine(self, x0, y0, x1, y1, color=None, colorFunc=None, aa=False):
md.draw_line(self.set, x0, y0, x1, y1, color, colorFunc, aa)<EOL>
Draw a between x0, y0 and x1, y1 in an RGB color.

:param colorFunc: a function that takes an integer from x0 to x1 and
    returns a color corresponding to that point
:param aa: if True, use Bresenham's algorithm for line drawing;
    otherwise use Xiaolin Wu's algorithm