Tell us what’s happening:
Your angle method should return the value of the private attribute __angle converted to degrees. The error i get when using this line of code, im assuming it’s got something to do with line 57, isn’t that the attribute it’s talking about? I tried returning math.radians(angle) but not only did it not work it woudn’t make sense because there is not mentioning of an instance and that is an instance
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: {round(math.degrees(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()))
]
# User Editable Region
@property
def speed(self):
return self.__speed
@property
def height(self):
return self.__height
@property
def angle(self):
return self.__angle
# User Editable Region
ball = Projectile(10, 3, 45)
print(ball)
coordinates = ball.calculate_all_coordinates()
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Challenge Information:
Learn Encapsulation by Building a Projectile Trajectory Calculator - Step 9