surface_obj.fill('color') function is causing error

Question

i am trying to make hangman with pygame

1 > if you copy following code in IDE and run it will prompt pygame window if you clicked inside button(circles) it will basically disappear . Like in typical hangman game

2> BUT if you comment line < win.fill(‘darkred’)> then code will stop working , meaning button(circles) will no more disappear

** can anyone tell why? **

import pygame , math
pygame.init()
WIDTH , HEIGHT = 900 , 600
win = pygame.display.set_mode((WIDTH , HEIGHT))
pygame.display.set_caption('Hangmane')
RUN = True

# indexing button coordinates and appending in letters(list)
letters = [ ]
RADIUS = 20 
BUTTON_X = 0
BUTTON_Y = 457
for i in range(26):
    BUTTON_X += 60
    if i == 14:
        BUTTON_X = 100
        BUTTON_Y = 520
    #pygame.draw.circle(win,'green',(BUTTON_X,BUTTON_Y),RADIUS,3)
    letters.append([BUTTON_X, BUTTON_Y])                

#drawing button(circle) in pygame window
def button():
    for letter in letters:
        BUTTON_X , BUTTON_Y = letter
        pygame.draw.circle(win,'green',(BUTTON_X,BUTTON_Y),RADIUS,3)

# this will check and remove if button(circle) is clicked
def click_checker(coordinates):
    letters.remove(coordinates)

while RUN:
    win.fill('darkred') #if you comment this than code will not work as intended
    button()
    pygame.display.update()
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            RUN = False
        if event.type == pygame.MOUSEBUTTONDOWN:
                pos_x , pos_y = pygame.mouse.get_pos()
                print(pos_x , pos_y)
                for letter in letters:
                    BUTTON_X , BUTTON_Y = letter
                    dis = math.sqrt((BUTTON_X-pos_x)**2 + (BUTTON_Y-pos_y)**2)
                    if dis < RADIUS: # this will check if distance between mouse Cursor is less than button(circle) radius
                        #print('clicked')
                        click_checker(letter)

pygame.quit()

Asked By: nobod_369

||

Source

Answer 1

You should first understand how the code works inside the while RUN: loop:

The window is filled with dark red erasing any previous buttons, and green buttons are drawn using the x and y coordinates in the letters list.
On every press, if a button is pressed, then the button’s x and y coordinates are removed from the letters list.
If button is not pressed, then nothing is removed from the letters list.
Now, go to step 1 again.

If you comment out win.fill('darkred') then the window will not be painted over, hence the previous buttons are not erased. So even though it will only redraw 25 buttons, the other button is still visible from the previous drawing.

Answered By: viggnah

surface_obj.fill('color') function is causing error

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