Preface :
In this issue, we will make a simple skiing game .
I don't say much nonsense , Let's start happily ~
result
As a rule, let's take a look at the renderings first
development tool
Python edition :3.6.4
Related modules :
pygame modular ;
As well as some Python Built in modules .
Environment building
install Python And add to environment variable ,pip Install the relevant modules required .
Principle introduction
The rules of the game :
Players go through “AD” Key or “←→” Control the skier on the move , Try to avoid the trees on the road , Try to pick up the little flag on the road .
If you hit a tree , Then the score is reduced 50, If you find a flag , Then the score will be increased 10.
Step by step :
Step1: Define the sprite class
Because the game involves collision detection ( The skier's collision with trees and flags ), So we define two elf classes , Used to represent skiers and obstacles respectively ( Trees and flags ):
''' Skiers '''
class SkierClass(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
# The direction of the skier (-2 To 2)
self.direction = 0
self.imagepaths = cfg.SKIER_IMAGE_PATHS[:-1]
self.image = pygame.image.load(self.imagepaths[self.direction])
self.rect = self.image.get_rect()
self.rect.center = [320, 100]
self.speed = [self.direction, 6-abs(self.direction)*2]
''' Change the direction of the skier . Negative numbers are left , A positive number is right ,0 To move forward '''
def turn(self, num):
self.direction += num
self.direction = max(-2, self.direction)
self.direction = min(2, self.direction)
center = self.rect.center
self.image = pygame.image.load(self.imagepaths[self.direction])
self.rect = self.image.get_rect()
self.rect.center = center
self.speed = [self.direction, 6-abs(self.direction)*2]
return self.speed
''' Mobile skiers '''
def move(self):
self.rect.centerx += self.speed[0]
self.rect.centerx = max(20, self.rect.centerx)
self.rect.centerx = min(620, self.rect.centerx)
''' Obstacles '''
class ObstacleClass(pygame.sprite.Sprite):
def __init__(self, img_path, location, attribute):
pygame.sprite.Sprite.__init__(self)
self.img_path = img_path
self.image = pygame.image.load(self.img_path)
self.location = location
self.rect = self.image.get_rect()
self.rect.center = self.location
self.attribute = attribute
self.passed = False
''' Move '''
def move(self, num):
self.rect.centery = self.location[1] - num
among , Skiers should have left in their progress , The ability to shift to the right , And it makes sense that the skier's forward speed should slow down during the offset , Only in this way can players operate . meanwhile , Skiers should have different postures to show how they are sliding :
A straight line :
A little bit to the left :
A lot to the left :
A little bit to the right :
A lot to the right :
in addition , Although the left and right movements of skiers are achieved by moving the skiers themselves , But the skier moves forward by moving obstacles .
Step2: Create obstacles randomly
Now we need to define a function that randomly creates obstacles , So that it can be called in the main loop of the game :
The purpose of creating obstacles twice is to facilitate the screen connection .
Then we can define the main loop :
''' The main cycle of the game '''
while True:
# -- Event capture
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
sys.exit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT or event.key == pygame.K_a:
speed = skier.turn(-1)
elif event.key == pygame.K_RIGHT or event.key == pygame.K_d:
speed = skier.turn(1)
'''-- Update the data of the current game frame '''
skier.move()
distance += speed[1]
if distance >= 640 and obstaclesflag == 0:
obstaclesflag = 1
obstacles0 = createObstacles(20, 29)
obstacles = AddObstacles(obstacles0, obstacles1)
if distance >= 1280 and obstaclesflag == 1:
obstaclesflag = 0
distance -= 1280
for obstacle in obstacles0:
obstacle.location[1] = obstacle.location[1] - 1280
obstacles1 = createObstacles(10, 19)
obstacles = AddObstacles(obstacles0, obstacles1)
for obstacle in obstacles:
obstacle.move(distance)
'''-- collision detection '''
hitted_obstacles = pygame.sprite.spritecollide(skier, obstacles, False)
if hitted_obstacles:
if hitted_obstacles[0].attribute == "tree" and not hitted_obstacles[0].passed:
score -= 50
skier.setFall()
updateFrame(screen, obstacles, skier, score)
pygame.time.delay(1000)
skier.setForward()
speed = [0, 6]
hitted_obstacles[0].passed = True
elif hitted_obstacles[0].attribute == "flag" and not hitted_obstacles[0].passed:
score += 10
obstacles.remove(hitted_obstacles[0])
'''-- Update screen '''
updateFrame(screen, obstacles, skier, score)
clock.tick(cfg.FPS)
The main loop consists of :
Event monitoring 、 Update of obstacles 、 Collision detection and score display, etc , In short, it is easy to achieve .
Step4: other
Start 、 End the interface , It's up to us to play by ourselves , I just wrote a simple start interface :
''' Show the game start interface '''
def ShowStartInterface(screen, screensize):
screen.fill((255, 255, 255))
tfont = pygame.font.Font(cfg.FONTPATH, screensize[0]//5)
cfont = pygame.font.Font(cfg.FONTPATH, screensize[0]//20)
title = tfont.render(u' Skiing games ', True, (255, 0, 0))
content = cfont.render(u' Press any key to start the game ', True, (0, 0, 255))
trect = title.get_rect()
trect.midtop = (screensize[0]/2, screensize[1]/5)
crect = content.get_rect()
crect.midtop = (screensize[0]/2, screensize[1]/2)
screen.blit(title, trect)
screen.blit(content, crect)
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
sys.exit()
elif event.type == pygame.KEYDOWN:
return
pygame.display.update()
This is the end of the article , Thanks for watching ,Python24 A series of small games , The next article shares the classics 90 Tanks war
To thank readers , I want to share with you some of my recent collections of programming dry goods , Give back to every reader , I hope I can help you .
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① 2000 Multiple copies Python e-book ( There should be both mainstream and classic books )
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③ Project source code ( Forty or fifty interesting and classic training projects and source code )
④ Python Basic introduction 、 Reptiles 、web Development 、 Big data analysis video ( Suitable for Xiaobai to learn )
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