Convert a PyChart color object to an SVG rgb() value.
    See color.py.

def _svgcolor(color):
    """
    Convert a PyChart color object to an SVG rgb() value.
    See color.py.
    """
    return 'rgb(%d,%d,%d)' % tuple([int(255 * x) for x in [color.r, color.g, color.b]])