I am using Pygame, I have a Windows 10 computer, working in Anaconda- Spyder.
I made a game where a car moves around the screen dodging objects. Currently the background is white but I would like to put a background image. However when I do the FPS drops dramatically. I understand this is because I am updating the display at 60 fps. I heard about dirty rect animation and I am trying to understand it but at the moment I am stuck on how to achieve my goal of having a background without the game suffering because of it.
If anyone could also answer a separate question that would be great. How do I make the car speed higher without having to increase the fps rate
Here is my code. The comments are my attempts at dirty rec animation.
"""
Racing Game
Created on Mon Nov 11 13:36:45 2017
Author: Oscar
"""
import pygame
import random
#from gameHub import userName
#add powerups
#add borders
#add stickman Oscar that throws bombs
#add help menu
pygame.init()
displayWidth = 800
displayHeight = 644
crashWidth = 800
crashHeight = 600
introWidth = 800
introHeight = 555
black = (0,0,0)
white = (255,255,255)
red = (200,0,0)
green = (0,200,0)
brightRed = (255,0,0)
brightGreen = (0,255,0)
carWidth = 73
carHeight = 82
rocketHeight = 261
rocketWidth = 95
gameDisplay = pygame.display.set_mode((displayWidth,displayHeight))
pygame.display.set_caption('Rocky Racing')
clock = pygame.time.Clock()
carImg = pygame.image.load('racecar.jpg').convert_alpha()
rocketImg = pygame.image.load('rocket.png').convert_alpha()
stickImg = pygame.image.load('stickman.png').convert_alpha()
speedPowerImg= pygame.image.load('speedPower.png').convert_alpha()
slowTimePowerImg= pygame.image.load('slowTimePower.png').convert_alpha()
pause = False
#----------------------------------Tools--------------------------------------------
def rocketDodged(count):
font = pygame.font.SysFont("comicsansms", 25)
text = font.render("Missles Dodged: "+str(count), True, black)
gameDisplay.blit(text,(0,0))
def gameObjects(objectImg,posX,posY):
gameDisplay.blit(objectImg,(posX,posY))
def gamePowerUp(objectImg):
posX = random.randrange(0, displayWidth)
posY = random.randrange(70, displayHeight - 50)
gameDisplay.blit(objectImg,(posX,posY))
def textObjects(text, font):
textSurface = font.render(text, True, black)
return textSurface, textSurface.get_rect()
def crash():
gameDisplay = pygame.display.set_mode((crashWidth,crashHeight))
gameDisplay.blit((pygame.image.load('citynuke.jpg')),(0,0))
largeText = pygame.font.SysFont("comicsansms",115)
TextSurf, TextRect = textObjects("You Crashed!", largeText)
TextRect.center = ((displayWidth/2),(displayHeight/2))
gameDisplay.blit(TextSurf, TextRect)
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
button("Play Again",150,450,100,50,20,green,brightGreen,gameLoop)
button("Quit",550,450,100,50,20,red,brightRed,quitgame)
pygame.display.update()
clock.tick(15)
def button(msg,xPos,yPos,width,height,fontSize,ic,ac,action=None):
mouse = pygame.mouse.get_pos()
click = pygame.mouse.get_pressed()
if xPos+width > mouse[0] > xPos and yPos+height > mouse[1] > yPos:
pygame.draw.rect(gameDisplay, ac,(xPos,yPos,width,height))
if click[0] == 1 and action != None:
action()
else:
pygame.draw.rect(gameDisplay, ic,(xPos,yPos,width,height))
smallText = pygame.font.SysFont("comicsansms",fontSize)
textSurf, textRect = textObjects(msg, smallText)
textRect.center = ( (xPos+(width/2)), (yPos+(height/2)) )
gameDisplay.blit(textSurf, textRect)
def quitgame():
pygame.quit()
quit()
#--------------------------------Screens---------------------------------------------
def unpause():
global pause
pause = False
def paused():
gameDisplay.fill(white)
largeText = pygame.font.SysFont("comicsansms",115)
TextSurf, TextRect = textObjects("Paused", largeText)
TextRect.center = ((displayWidth/2),(displayHeight/2))
gameDisplay.blit(TextSurf, TextRect)
while pause:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
button("Continue",150,450,100,50,20,green,brightGreen,unpause)
button("Quit",550,450,100,50,20,red,brightRed,quitgame)
pygame.display.update()
clock.tick(15)
#------------------------------------Game--------------------------------------------
def gameIntro():
intro = True
while intro:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
gameDisplay.fill(white)
gameDisplay.blit((pygame.image.load('introscreen.jpg')),(0,0))
button("GO!",150,450,100,50,20,green,brightGreen,gameLoop)
button("Quit",550,450,100,50,20,red,brightRed,quitgame)
pygame.display.update()
clock.tick(25)
def gameLoop():
global pause
dirtyRec = []
carX = (displayWidth * 0.45)
carY = (displayHeight * 0.8)
xChange = 0
yChange = 0
rocketX = random.randrange(0, displayWidth - rocketWidth)
rocketY = -600
rocketSpeed = 4
stickY = 28
dodged = 0
#display = pygame.Rect(0,0,displayWidth,displayHeight)
#gameDisplay.fill(white)
#pygame.display.update(display)
gameExit = False
while not gameExit:
stickX = rocketX
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
xChange = -5
if event.key == pygame.K_RIGHT:
xChange = 5
if event.key == pygame.K_DOWN:
yChange = 5
if event.key == pygame.K_UP:
yChange = -5
if event.key == pygame.K_p:
pause = True
paused()
if event.type == pygame.KEYUP:
keys = pygame.key.get_pressed()
if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
xChange = 0
if keys[pygame.K_LEFT]:
xChange = -5
if keys[pygame.K_RIGHT]:
xChange = 5
if event.key == pygame.K_UP or event.key == pygame.K_DOWN:
yChange = 0
if keys[pygame.K_DOWN]:
yChange = 5
if keys[pygame.K_UP]:
yChange = -5
carX += xChange
carY += yChange
#carPos = pygame.Rect(carX,carY,carWidth+5,carHeight+5)
#dirtyRec.append(carPos)
#rocketPos = pygame.Rect(rocketX,rocketY,rocketWidth+5,rocketHeight+5)
#dirtyRec.append(rocketPos)
gameDisplay.fill(white)
#speedUpPower = gamePowerUp(speedPowerImg)
#slowTimePower = gamePowerUp(slowTimePowerImg)
rockets= gameObjects(rocketImg,rocketX, rocketY)
stickFigure = gameObjects(stickImg,stickX,stickY)
rocketY += rocketSpeed
car = gameObjects(carImg,carX,carY)
rocketDodged(dodged)
if carX > displayWidth - carWidth or carX < 0 or carY > displayHeight - carHeight or carY < 0:
crash()
if rocketY > displayHeight:
rocketY = 0 - rocketHeight
rocketX = random.randrange(0,displayWidth)
dodged += 1
rocketSpeed += .5
if carY < rocketY+rocketHeight and carY > rocketY:
if carX > rocketX and carX < rocketX + rocketWidth or carX+carWidth > rocketX and carX + carWidth < rocketX + rocketWidth:
crash()
#pygame.display.update(dirtyRec)
pygame.display.update()
clock.tick(40)
def rrMain():
gameIntro()
gameLoop()
pygame.quit()
quit()
rrMain()
