Learn Encapsulation by Building a Projectile Trajectory Calculator - Step 14

Python
1

Tell us what’s happening:

Already follow the example to output the table, but still can’t pass. Saw some posts on the forum about the spacing problem but can’t find different from my output to the example.

Your code so far

import math

GRAVITATIONAL_ACCELERATION = 9.81
PROJECTILE = "∙"
x_axis_tick = "T"
y_axis_tick = "⊣"

class Projectile:
    __slots__ = ('__speed', '__height', '__angle')

    def __init__(self, speed, height, angle):
        self.__speed = speed
        self.__height = height
        self.__angle = math.radians(angle)
        
    def __str__(self):
        return f'''
Projectile details:
speed: {self.speed} m/s
height: {self.height} m
angle: {self.angle}°
displacement: {round(self.__calculate_displacement(), 1)} m
'''

    def __calculate_displacement(self):
        horizontal_component = self.__speed * math.cos(self.__angle)
        vertical_component = self.__speed * math.sin(self.__angle)
        squared_component = vertical_component**2
        gh_component = 2 * GRAVITATIONAL_ACCELERATION * self.__height
        sqrt_component = math.sqrt(squared_component + gh_component)
        
        return horizontal_component * (vertical_component + sqrt_component) / GRAVITATIONAL_ACCELERATION
        
    def __calculate_y_coordinate(self, x):
        height_component = self.__height
        angle_component = math.tan(self.__angle) * x
        acceleration_component = GRAVITATIONAL_ACCELERATION * x ** 2 / (
                2 * self.__speed ** 2 * math.cos(self.__angle) ** 2)
        y_coordinate = height_component + angle_component - acceleration_component

        return y_coordinate
    
    def calculate_all_coordinates(self):
        return [
            (x, self.__calculate_y_coordinate(x))
            for x in range(math.ceil(self.__calculate_displacement()))
        ]

    @property
    def height(self):
        return self.__height

    @property
    def angle(self):
        return round(math.degrees(self.__angle))

    @property
    def speed(self):
        return self.__speed

    @height.setter
    def height(self, n):
        self.__height = n

    @angle.setter
    def angle(self, n):
        self.__angle = math.radians(n)

    @speed.setter
    def speed(self, s):
       self.__speed = s
    
    def __repr__(self):
        return f'{self.__class__}({self.speed}, {self.height}, {self.angle})'

class Graph:
    __slots__ = ('__coordinates')

    def __init__(self, coord):
        self.__coordinates = coord
    
    def __repr__(self):
        return f'Graph({self.__coordinates})'


# User Editable Region

    def create_coordinates_table(self):
        table='  x      y \n'
        for i in range(0, len(self.__coordinates)):
            front_spacing = '  ' if i < 10 else ' '
            y_coord = self.__coordinates[i][1]
            rounded_value = f"{y_coord:.2f}"
            table += f'{front_spacing}{i}   {rounded_value} '
            table += f'\n' if i < len(self.__coordinates) - 1 else '  '
        return table


ball = Projectile(10, 3, 45)
print(ball)
coordinates = ball.calculate_all_coordinates()

graph = Graph(coordinates)
print(graph.create_coordinates_table())

# User Editable Region

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Challenge Information:

Learn Encapsulation by Building a Projectile Trajectory Calculator - Step 14

1 Like
2

You’re very close! Here are some hints to help you out.

  1. When using the for loop in create_coordinates_table function, it should loop through coordinates as tuples and the function needs to start with a newline and end with a newline. and don’t use inconsistent spacing.
  2. also the instructions say, format the x values so that’s it is right aligned and the y values to two decimal places, you can do that in a single line using an f-string format which is easier.

Good luck! let us know if you have any questions!