Question

How to make a simple game in pygame where an object is randomly falling from the top of the screen and you need to move another object at the bottom of the screen left and right to catch the object that is falling

Answer 1

"""

Sample Python/Pygame Programs

Simpson College Computer Science

http://programarcadegames.com/

http://simpson.edu/computer-science/

Explanation video: http://youtu.be/qbEEcQXw8aw

"""

import pygame

import random

# Define some colors

BLACK = (0, 0, 0)

WHITE = (255, 255, 255)

GREEN = (0, 255, 0)

RED = (255, 0, 0)

class Block(pygame.sprite.Sprite):

"""

This class represents the ball

It derives from the "Sprite" class in Pygame

"""

def __init__(self, color, width, height):

""" Constructor. Pass in the color of the block,

and its x and y position. """

# Call the parent class (Sprite) constructor

super().__init__()

# Create an image of the block, and fill it with a color.

# This could also be an image loaded from the disk.

self.image = pygame.Surface([width, height])

self.image.fill(color)

# Fetch the rectangle object that has the dimensions of the image

# image.

# Update the position of this object by setting the values

# of rect.x and rect.y

self.rect = self.image.get_rect()

def reset_pos(self):

""" Reset position to the top of the screen, at a random x location.

Called by update() or the main program loop if there is a collision.

"""

self.rect.y = random.randrange(-300, -20)

self.rect.x = random.randrange(0, screen_width)

def update(self):

""" Called each frame. """

# Move block down one pixel

self.rect.y += 1

# If block is too far down, reset to top of screen.

if self.rect.y > 410:

self.reset_pos()

class Player(Block):

""" The player class derives from Block, but overrides the 'update'

functionality with new a movement function that will move the block

with the mouse. """

def update(self):

# Get the current mouse position. This returns the position

# as a list of two numbers.

pos = pygame.mouse.get_pos()

# Fetch the x and y out of the list,

# just like we'd fetch letters out of a string.

# Set the player object to the mouse location

self.rect.x = pos[0]

self.rect.y = pos[1]

# Initialize Pygame

pygame.init()

# Set the height and width of the screen

screen_width = 700

screen_height = 400

screen = pygame.display.set_mode([screen_width, screen_height])

# This is a list of 'sprites.' Each block in the program is

# added to this list. The list is managed by a class called 'Group.'

block_list = pygame.sprite.Group()

# This is a list of every sprite. All blocks and the player block as well.

all_sprites_list = pygame.sprite.Group()

for i in range(50):

# This represents a block

block = Block(BLACK, 20, 15)

# Set a random location for the block

block.rect.x = random.randrange(screen_width)

block.rect.y = random.randrange(screen_height)

# Add the block to the list of objects

block_list.add(block)

all_sprites_list.add(block)

# Create a red player block

player = Player(RED, 20, 15)

all_sprites_list.add(player)

# Loop until the user clicks the close button.

done = False

# Used to manage how fast the screen updates

clock = pygame.time.Clock()

score = 0

# -------- Main Program Loop -----------

while not done:

for event in pygame.event.get():

if event.type == pygame.QUIT:

done = True

# Clear the screen

screen.fill(WHITE)

# Calls update() method on every sprite in the list

all_sprites_list.update()

# See if the player block has collided with anything.

blocks_hit_list = pygame.sprite.spritecollide(player, block_list, False)

# Check the list of collisions.

for block in blocks_hit_list:

score += 1

print(score)

# Reset block to the top of the screen to fall again.

block.reset_pos()

# Draw all the spites

all_sprites_list.draw(screen)

# Limit to 20 frames per second

clock.tick(20)

# Go ahead and update the screen with what we've drawn.

pygame.display.flip()

pygame.quit()