Pygame: how to display the frame rate (FPS) on the screen

For a game it is so important tha frame rate is at a high rate (60 fps, frames per secons) and so I thought to post the code to show the frame rate. This one will show just the frame rate, so it is useless alone, but I thought to isolate the code for fps in a code that actually works, so that you could easily implement it in your code. Probably there is a better way to reuse this code. If you have some idea, tell it in the comment. Maybe I will come back to this topic next time.

import pygame

def init_screen_and_clock():
    global screen, display, clock
    pygame.init()
    WINDOW_SIZE = (1150, 640)
    pygame.display.set_caption('Game')
    screen = pygame.display.set_mode(WINDOW_SIZE, 0, 32)
    clock = pygame.time.Clock()


def create_fonts(font_sizes_list):
    "Creates different fonts with one list"
    fonts = []
    for size in font_sizes_list:
        fonts.append(
            pygame.font.SysFont("Arial", size))
    return fonts


def render(fnt, what, color, where):
    "Renders the fonts as passed from display_fps"
    text_to_show = fnt.render(what, 0, pygame.Color(color))
    screen.blit(text_to_show, where)


def display_fps():
    "Data that will be rendered and blitted in _display"
    render(
        fonts[0],
        what=str(int(clock.get_fps())),
        color="white",
        where=(0, 0))


init_screen_and_clock()
# This create different font size in one line
fonts = create_fonts([32, 16, 14, 8])

loop = 1
while loop:
    screen.fill((0, 0, 0))
    display_fps()
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            loop = 0
    clock.tick(60)
    pygame.display.flip()

pygame.quit()
print("Game over")

Short version

This is a little less complicated version

• We initialise pygame, create the screen, the clock and the font objects
• in the while loop we
  • clear the screen (screen.fill((0,0,0))
  • call the update_fps() => it gets the clock fps and render it on the screen
  • update the screen

import pygame

pygame.init()
screen = pygame.display.set_mode((400,400))
clock = pygame.time.Clock()
font = pygame.font.SysFont("Arial", 18)


def update_fps():
	fps = str(int(clock.get_fps()))
	fps_text = font.render(fps, 1, pygame.Color("coral"))
	return fps_text


loop = 1
while loop:
	screen.fill((0, 0, 0))
	screen.blit(update_fps(), (10,0))
	for event in pygame.event.get():
		if event.type == pygame.QUIT:
			loop = 0
	clock.tick(60)
	pygame.display.update()

pygame.quit()

So, pratically, if you want to add the frame rate to your game (for testing):

1. Use SysFont

add this in the global slope (variable accessible everywhere… so outside of functions and classes or into function declared global):

font = pygame.font.SysFont("Arial", 18)

2. Then add this function somewhere

def update_fps():
	fps = str(int(clock.get_fps()))
	fps_text = font.render(fps, 1, pygame.Color("coral"))
	return fps_text

3. Finally put this in the while loop:

	screen.blit(update_fps(), (10,0))

Put it after the clearing of the screen screen.fill((0, 0, 0)) that, pratically, colors the screen in black.

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