def __generate_horizontal_line_to(self, command, coords=CoordinateSystem.ABSOLUTE):
"""Generates string output for horizontal line command"""
end_point = Point(command[0], self.__current_pos.y)
if coords == CoordinateSystem.RELATIVE:
end_point = self.__current_pos + Point(command[0], 0.0)
elif coords != CoordinateSystem.ABSOLUTE:
raise WrongCoordinateSystem()
self.__update_current_pos(end_point)
return self.__print_add_line(end_point)
def __generate_quadratic_curve(self, command, coords=CoordinateSystem.ABSOLUTE):
"""Generates string output for quadratic curve command"""
control_point = Point(command[0], command[1])
end_point = Point(command[2], command[3])
if coords == CoordinateSystem.RELATIVE:
control_point = self.__current_pos + control_point
end_point = self.__current_pos + end_point
elif coords != CoordinateSystem.ABSOLUTE:
raise WrongCoordinateSystem()
self.__update_current_pos(end_point)
self.__update_last_quadratic_control_point(control_point)
return self.__print_quadratic(end_point, control_point)
def __generate_cubic_smooth_curve(self, command, coords=CoordinateSystem.ABSOLUTE):
"""Generates string output for cubic smooth curve command"""
first_control_point = 2 * self.__current_pos - self.__last_cubic_control_point
second_control_point = Point(command[0], command[1])
end_point = Point(command[2], command[3])
if coords == CoordinateSystem.RELATIVE:
second_control_point = self.__current_pos + second_control_point
end_point = self.__current_pos + end_point
elif coords != CoordinateSystem.ABSOLUTE:
raise WrongCoordinateSystem()
self.__update_current_pos(end_point)
self.__update_last_cubic_control_point(second_control_point)
return self.__print_cubic(end_point, first_control_point, second_control_point)
def __generate_elliptical_curve(self, command, coords=CoordinateSystem.ABSOLUTE):
"""Generates string output for elliptical curve command"""
if command[0] != command[1]:
raise NotImplementedError("Sorry, but a/A command with different x/y radius not implemented yet.")
radius = command[0]
# angle = command[2]
# large_arc_flag = command[3]
sweep_flag = 'true' if command[4] == 1 else 'false'
end_point = Point(command[5], command[6])
if coords == CoordinateSystem.RELATIVE:
end_point = self.__current_pos + end_point
elif coords != CoordinateSystem.ABSOLUTE:
raise WrongCoordinateSystem()
center_point = (end_point + self.__current_pos) / 2
self.__update_current_pos(end_point)
return self.__print_elliptical(
center_point,
radius,
0.0,
360.0,
sweep_flag)
def __generate_move_to(self, command, coords=CoordinateSystem.ABSOLUTE):
"""Generates string output for move commands"""
end_point = Point(command[0], command[1])
if coords == CoordinateSystem.RELATIVE:
end_point = self.__current_pos + end_point
elif coords != CoordinateSystem.ABSOLUTE:
raise WrongCoordinateSystem()
self.__update_current_pos(end_point)
return self.__print_move_to(end_point)
def __init__(self):
"""Setup generator"""
self.__parser = Parser()
self.__current_pos = Point(0.0, 0.0)
self.__last_cubic_control_point = None
self.__last_quadratic_control_point = None
self.__command_map = {
'm': self.__generate_move_to,
'l': self.__generate_line_to,
'h': self.__generate_horizontal_line_to,
'v': self.__generate_vertical_line_to,
'c': self.__generate_cubic_curve,
's': self.__generate_cubic_smooth_curve,
'q': self.__generate_quadratic_curve,
't': self.__generate_quadratic_smooth_curve,
'a': self.__generate_elliptical_curve,
'z': self.__generate_close
}