Pygame experiments: Fake scrolling animation

Repository on github of this example.

Messing around with some code we tried a couple of things along with this spite animation:

a fake scrolling animation
the use of group.clear(…) to avoid cleaning all the screen
drawing lines

Here is a video output. As not all the size of all the images are covereb by the bgd surface filled with black color that is used to delete the images, you will see the trace leaved on the screen and on the horizzontal red line.

Here is the code:

import pygame
import glob


def fps():
    fr = "V.3 Fps: " + str(int(clock.get_fps()))
    frt = font.render(fr, 1, pygame.Color("coral"))
    return frt


class MySprite(pygame.sprite.Sprite):
    def __init__(self, action):
        super(MySprite, self).__init__()
        self.action = action
        self.images = []
        self.temp_imgs = []
        self.load_images()
        self.count = 0

    def load_images(self):
        l_imgs = glob.glob(f"png\\{self.action}*.png")
        for img in l_imgs:
            if len(img) == len(l_imgs[0]):
                self.images.append(pygame.image.load(img))
            else:
                self.temp_imgs.append(pygame.image.load(img))
        self.images.extend(self.temp_imgs)
        self.index = 0
        self.rect = pygame.Rect(5, 5, 150, 198)

    def update(self):
        self.count += 1
        if self.index >= len(self.images):
            self.index = 0
        self.image = self.images[self.index]
        if self.count > 2:
            self.index += 1
            self.count = 0

    def group_sprites(self):
        return pygame.sprite.Group(self)


def group():
    dici = {}
    actions = "idle walk run jump dead"
    actions = actions.split()
    for action in actions:
        dici[action] = MySprite(action).group_sprites()
    return dici

def main():
    global font, clock

    pygame.init()
    screen = pygame.display.set_mode((600, 600))
    pygame.display.set_caption("Game v.5")
    clock = pygame.time.Clock()
    font = pygame.font.SysFont("Arial", 60)
    keyactions = (
        (pygame.K_LEFT, "walk"),
        (pygame.K_UP, "jump"),
        (pygame.K_SPACE, "idle"),
        (pygame.K_RIGHT, "run"),
        (pygame.K_DOWN, "dead"))
    action = group()
    my_group = action["idle"]

    ln = 509
    ln2 = 511
    run = False
    loop = 1
    line = 599
    bgd = pygame.Surface((400, 509))
    bgd.fill((0,0,0))
    pygame.draw.line(screen, (255, 0, 0), (0, ln), (ln + 100, ln), 2)
    while loop:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                loop = 0
            if event.type == pygame.KEYDOWN:
                for k, v in keyactions:
                    if event.key == k:
                        my_group = action[v]
                        run = True
        my_group.update()
        # screen.fill((0, 0, 0))
        my_group.clear(screen, bgd)
        my_group.draw(screen)
        pygame.draw.line(screen, (0, 0, 0), (line + 6, ln2), (line + 6, ln2 + 100), 2)
        pygame.draw.line(screen, (255, 0, 0), (line, ln2), (line, ln2 + 100), 2)
        if run:
            line -= 3
            if line < - 7:
                line = 599
        screen.blit(fps(), (10, 0))
        clock.tick(60)
        pygame.display.update()
    pygame.quit()


if __name__ == "__main__":
    main()