robot.py

import turtle
from mouse import Mouse

# experimentally determined average of values with lots of deviation
MM_PER_P = 300 / 3830


class Robot(turtle.Turtle):
    """Robot inherits from Turtle, so we can make it work with mice and
    things."""
    def __init__(self):
        # call super to initialize a Robot as a Turtle
        super(Robot, self).__init__()
        self.start_x, self.start_y = self.position()
        self.screen = turtle.Screen()
        # only draw every 5 updates with a delay of 16 milliseconds (100 hz)
        self.screen.tracer(5, 10)

    def track_motion(self):
        """starts tracking the motion of a mouse. (moution?)"""
        with Mouse() as mouse:
            while True:
                try:
                    self.update(mouse)
                except KeyboardInterrupt:
                    break

    def update(self, mouse):
        """perform a single update to the Robot's position"""
        status, dx, dy = mouse.update()
        # left mouse click resets the robot position and heading
        if status[-1]:
            self.reset()
            self.start_x, self.start_y = self.position()

        x, y = self.position()

        x += dx
        y += dy
        self.setposition(x, y)
        radius = self.distance(self.start_x, self.start_y) * MM_PER_P

        print('x: {} y: {}'.format(x, y))
        print('\tdistance from the origin: {:.2f} mm'.format(radius))