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Python | Making an object jump in PyGame

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  • Difficulty Level : Hard
  • Last Updated : 19 Feb, 2020
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Pygame is a cross-platform set of Python modules designed for writing video games. It includes computer graphics and sound libraries designed to be used with the Python programming language. Now, it’s up to the imagination or necessity of developer, what type of game he/she wants to develop using this toolkit.
So, in this article, we will learn how to make an object jump using PyGame library in Python.

There is basic formula from classical mechanics to make an object jump.

F = 1/2 * m * v^2 

Where F is the force up/down, m is the mass of the object and v is the velocity. The velocity goes down over time because when the object jumps the velocity will not increase more in this simulation. When object reaches the ground, the jump ends. If isjump variable is True or False it indicates object is jumping or not. If isjump is True, object position will be updated according to the above formula.

Below is the implementation:

# import pygame module in this program 
import pygame
# activate the pygame library . 
# initiate pygame and give permission 
# to use pygame's functionality. 
# create the display surface object 
# of specific dimension..e(500, 500). 
win = pygame.display.set_mode((500, 500))
# set the pygame window name 
pygame.display.set_caption("Jump Game")
# object current co-ordinates
x = 200
y = 200
# dimensions of the object
width = 30
height = 40
# Stores if player is jumping or not
isjump = False
# Force (v) up and mass m.
v = 5
m = 1
# Indicates pygame is running
run = True
# infinite loop
while run:
    # completely fill the surface object 
    # with black colour 
    win.fill((0, 0, 0))
    # drawing object on screen which is rectangle here 
    pygame.draw.rect(win, (255, 0, 0), (x, y, width, height))
    # iterate over the list of Event objects 
    # that was returned by pygame.event.get() method. 
    for event in pygame.event.get():
        # if event object type is QUIT 
        # then quitting the pygame 
        # and program both. 
        if event.type == pygame.QUIT:
            # it will make exit the while loop
            run = False
    # stores keys pressed
    keys = pygame.key.get_pressed()
    if isjump == False:
        # if space bar is pressed
        if keys[pygame.K_SPACE]:
            # make isjump equal to True
            isjump = True
    if isjump :
        # calculate force (F). F = 1 / 2 * mass * velocity ^ 2.
        F =(1 / 2)*m*(v**2)
        # change in the y co-ordinate
        y-= F
        # decreasing velocity while going up and become negative while coming down
        v = v-1
        # object reached its maximum height
        if v<0:
            # negative sign is added to counter negative velocity
            m =-1
        # objected reaches its original state
        if v ==-6:
            # making isjump equal to false 
            isjump = False
            # setting original values to v and m
            v = 5
            m = 1
    # creates time delay of 10ms
    # it refreshes the window
# closes the pygame window    

Output :

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