'Set the fill color for the arrow as a string (`#RGB`, `#RRGGBB`,
`#RRRGGGBBB`, `#RRRRGGGGBBBB` format or one of SVG color keyword
names).'

def set_color(self, color):

    check_type(color, str)
    color = str(color)
    if (self.__color != color):
        self.__color = color
        self.color_changed.emit(color)
