Python code:

    def ramp_line(self, start: Coord, end: Coord, ratio: float, depth: float) -> list[str]:
        """
        Execute a linear ramp, with a fixed ratio of length to height.
        Includes start, entry, and stop. It overshoots the desired depth to always
        end on either the start or end point.
        
        `ratio` is in length-to-height. Ie higher means shallower.
        """
        # todo: Do we want an angle in degrees/radians, or this ramp ratio?
        result = [
            f"G01 X{start.x} Y{start.y} Z{self.start_stop_height}",
            "M03",
            f"G01 Z{self.buffer_height}"  # This is where cutting (roughly) begins
        ]

        # `depth_step` is how far to descend each length-wise run. Note that
        # it doesn't take the buffer height into account.
        depth_step  = dist(start, end) / ratio

        active_coord = Coord(start.x, start.y, self.buffer_height)
        while active_coord.z > depth:
            active_coord.z -= depth_step
            if active_coord.x == start.x and active_coord.y == start.y:
                active_coord.x = end.x
                active_coord.y = end.y
            else:
                active_coord.x = start.x
                active_coord.y = start.y
                
            result.append(active_coord.linear_move())

        result.extend([
            f"G01 Z{self.start_stop_height}",
            "M05",
        ])

        return result