frameratecompare.py

#background_image_filename = 'sushiplate.jpg'
sprite_image_filename = 'tomato.png'

import pygame
from pygame.locals import *
from sys import exit

pygame.init()
screen = pygame.display.set_mode((640, 480), 0, 32)

#background = pygame.image.load(background_image_filename).convert()
sprite = pygame.image.load(sprite_image_filename)

# Our clock object
clock = pygame.time.Clock()

x1 = 0.
x2 = 0.

# Speed in pixels per second
speed = 250.
frame_no = 0

while True:
	for event in pygame.event.get():
		if event.type == QUIT:
			exit()

	#screen.blit(background, (0,0))
	screen.fill((255, 255, 255))
	screen.blit(sprite, (x1, 50))
	screen.blit(sprite, (x2, 250))

	time_passed = clock.tick(30)
	time_passed_seconds = time_passed / 1000.0
	distance_moved = time_passed_seconds * speed
	x1 += distance_moved

	if (frame_no % 5) == 0:
		distance_moved = time_passed_seconds * speed
		x2 += distance_moved * 5.

	# If the image goes off the end of the screen, move it back
	if x1 > 640.:
		x1 -= 640.
	if x2 > 640.:
		x2 -= 640.

	pygame.display.update()
	frame_no += 1