Scriptt

import pygame
import sys
import random
import math

pygame.init()

WIDTH, HEIGHT = 1000, 650
screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Graffiti Wall")

clock = pygame.time.Clock()

color = (0,255,180)
brush_size = 14
drawing = False
last_pos = None

canvas = pygame.Surface((WIDTH, HEIGHT))
canvas.fill((60,60,60))

# -----------------------------
# brick wall
# -----------------------------

def draw_bricks(surface):

    brick_w = 80
    brick_h = 30

    for y in range(0, HEIGHT, brick_h):

        offset = (y//brick_h) % 2 * (brick_w//2)

        for x in range(-offset, WIDTH, brick_w):

            rect = pygame.Rect(x,y,brick_w,brick_h)

            pygame.draw.rect(surface,(90,90,90),rect)
            pygame.draw.rect(surface,(50,50,50),rect,1)

draw_bricks(canvas)

# -----------------------------
# soft spray brush
# -----------------------------

def spray(surface,pos,color,size):

    density = size * 12

    for i in range(density):

        angle = random.random()*math.pi*2
        radius = random.random()*size

        x = int(pos[0] + math.cos(angle)*radius)
        y = int(pos[1] + math.sin(angle)*radius)

        if 0 < x < WIDTH and 0 < y < HEIGHT:

            alpha = int(200*(1-radius/size))
            paint = (*color,alpha)

            dot = pygame.Surface((4,4),pygame.SRCALPHA)
            pygame.draw.circle(dot,paint,(2,2),2)

            surface.blit(dot,(x,y),special_flags=pygame.BLEND_ALPHA_SDL2)

# -----------------------------
# smooth stroke interpolation
# -----------------------------

def spray_line(surface,start,end,color,size):

    dx = end[0]-start[0]
    dy = end[1]-start[1]

    distance = int(math.hypot(dx,dy))

    if distance == 0:
        return

    for i in range(distance):

        x = int(start[0] + dx*i/distance)
        y = int(start[1] + dy*i/distance)

        spray(surface,(x,y),color,size)

# -----------------------------
# game loop
# -----------------------------

while True:

    for event in pygame.event.get():

        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

        if event.type == pygame.MOUSEBUTTONDOWN:
            drawing = True

        if event.type == pygame.MOUSEBUTTONUP:
            drawing = False
            last_pos = None

        if event.type == pygame.KEYDOWN:

            if event.key == pygame.K_c:
                canvas.fill((60,60,60))
                draw_bricks(canvas)

            if event.key == pygame.K_s:
                pygame.image.save(canvas,"tag.png")

            if event.key == pygame.K_LEFTBRACKET:
                brush_size = max(4,brush_size-2)

            if event.key == pygame.K_RIGHTBRACKET:
                brush_size += 2

            if event.key == pygame.K_1:
                color = (0,255,180)

            if event.key == pygame.K_2:
                color = (255,100,0)

            if event.key == pygame.K_3:
                color = (255,60,60)

            if event.key == pygame.K_4:
                color = (0,200,255)

            if event.key == pygame.K_5:
                color = (255,255,255)

    if drawing:

        current_pos = pygame.mouse.get_pos()

        if last_pos:
            spray_line(canvas,last_pos,current_pos,color,brush_size)

        last_pos = current_pos

    screen.blit(canvas,(0,0))
    pygame.display.flip()

    clock.tick(60)