How do I get the percentage of a colour in a screen in pygame? - pygame

Question

I am new to pygame and trying to create a 'splatoon' like game, I got the basic elements ready but I don't know how to calculate the percentage of the screen. Do I individually scan each pixel using get_at or is there an easier method to calculate it?
Here is my code:
import pygame
import sys
black = (0,0,0)
white = (255, 255, 255)
silver = (192, 192, 192)
aqua = (0, 255,255)
x = 10
y =490
a = 490
b = 10
vel = 1
pygame.init()
FPS = 60
fpsClock = pygame.time.Clock()
win = pygame.display.set_mode((500,500))
time = pygame.time.get_ticks()
while True:
seconds = (pygame.time.get_ticks())/1000
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
sys.exit()
if seconds <= 10:
keys = pygame.key.get_pressed()
color = black
if keys[pygame.K_d] and x < 490:
x += vel
if keys[pygame.K_RIGHT] and a < 490:
a += vel
if keys[pygame.K_a] and x > 0:
x -= vel
if keys[pygame.K_LEFT] and a > 0:
a -= vel
if keys[pygame.K_w] and y > 0:
y -= vel
if keys[pygame.K_UP] and b > 0:
b -= vel
if keys[pygame.K_s] and y < 490:
y += vel
if keys[pygame.K_DOWN] and b < 490:
b += vel
if keys[pygame.K_e]:
pygame.draw.rect(win, aqua, (x-20,y-20,50,50))
if keys[pygame.K_SPACE]:
pygame.draw.rect(win, silver, (a-20,b-20,50,50))
if keys[pygame.K_p]:
win.fill((0,0,0))
pygame.draw.rect(win, aqua, (x,y,10,10))
pygame.draw.rect(win, silver, (a,b,10,10))
pygame.display.update()
fpsClock.tick(FPS)
else:
break

Answer 1

I think you can use a function like this, using pygame.Surface.get_at():
def get_percentage(color, step=1):
width, height = screen_size
total_number_of_pixels = width * height
number_of_pixels = 0
for x in range(0, width, step):
for y in range(0, height, step):
if screen.get_at((x, y)) == color:
number_of_pixels += 1
percentage = number_of_pixels / total_number_of_pixels * 00
return percentage
But because it can considerably slow down the code, you may store the percentage and call this function only when the percentage is updated (for example if a player attacks).
And you can change the step var in the code above to get the percentage more roughly (and quicker).