Drag multiple sprites with different “update ()” methods from the same Sprite class in Pygame

Question

I\'m trying to make multiple sprites that all come from the same pygame sprite class.

class animatedSprites(pygame.sprite.Sprite):
    def __init__(self, spri         


        

Answer 1

I recommend to create a class DragOperator which can drag an pygame.Rect object:

class DragOperator:
    def __init__(self, rect):
        self.rect = rect
        self.dragging = False
        self.rel_pos = (0, 0)
    def update(self, event_list):
        for event in event_list:
            if event.type == pygame.MOUSEBUTTONDOWN:
                self.dragging = self.rect.collidepoint(event.pos)
                self.rel_pos = event.pos[0] - self.rect.x, event.pos[1] - self.rect.y
            if event.type == pygame.MOUSEBUTTONUP:
                self.dragging = False
            if event.type == pygame.MOUSEMOTION and self.dragging:
                self.rect.topleft = event.pos[0] - self.rel_pos[0], event.pos[1] - self.rel_pos[1]

The dragging of the rectangle is implemented in the update method. Use this class in a pygame.sprite.Sprite object. Pass the list of events to the update method of the Sprite and delegate it to the drag operator:

class animatedSprites(pygame.sprite.Sprite):
    def __init__(self, spriteName):
        # [...]

        self.drag = DragOperator(self.rect)

    def update(self, event_list):
        self.drag.update(event_list) 

Pass the list of event form the main application loop to the pygame.sprite.Group:

all_sprites = pygame.sprite.Group()
all_sprites.add(animatedSprites("my_sprite"))

run = True
while run:
    event_list = pygame.event.get()
    for event in event_list:
        if event.type == pygame.QUIT:
            run = False

    all_sprites.update(event_list)

    # [...]

---

Minmal example: repl.it/@Rabbid76/PyGame-MouseDrag

import pygame

class DragOperator:
    def __init__(self, rect):
        self.rect = rect
        self.dragging = False
        self.rel_pos = (0, 0)
    def update(self, event_list):
        for event in event_list:
            if event.type == pygame.MOUSEBUTTONDOWN:
                self.dragging = self.rect.collidepoint(event.pos)
                self.rel_pos = event.pos[0] - self.rect.x, event.pos[1] - self.rect.y
            if event.type == pygame.MOUSEBUTTONUP:
                self.dragging = False
            if event.type == pygame.MOUSEMOTION and self.dragging:
                self.rect.topleft = event.pos[0] - self.rel_pos[0], event.pos[1] - self.rel_pos[1]

class SpriteObject(pygame.sprite.Sprite):
    def __init__(self, x, y, color):
        super().__init__() 
        self.original_image = pygame.Surface((50, 50), pygame.SRCALPHA)
        pygame.draw.circle(self.original_image, color, (25, 25), 25)
        self.drag_image = pygame.Surface((50, 50), pygame.SRCALPHA)
        pygame.draw.circle(self.drag_image, color, (25, 25), 25)
        pygame.draw.circle(self.drag_image, (255, 255, 255), (25, 25), 25, 4)
        self.image = self.original_image 
        self.rect = self.image.get_rect(center = (x, y))
        self.drag = DragOperator(self.rect)
    def update(self, event_list):
        self.drag.update(event_list) 
        self.image = self.drag_image if self.drag.dragging else self.original_image

pygame.init()
window = pygame.display.set_mode((300, 300))
clock = pygame.time.Clock()

sprite_object = SpriteObject(*window.get_rect().center, (255, 255, 0))
group = pygame.sprite.Group([
    SpriteObject(window.get_width() // 3, window.get_height() // 3, (255, 0, 0)),
    SpriteObject(window.get_width() * 2 // 3, window.get_height() // 3, (0, 255, 0)),
    SpriteObject(window.get_width() // 3, window.get_height() * 2 // 3, (0, 0, 255)),
    SpriteObject(window.get_width() * 2// 3, window.get_height() * 2 // 3, (255, 255, 0)),
])

run = True
while run:
    clock.tick(60)
    event_list = pygame.event.get()
    for event in event_list:
        if event.type == pygame.QUIT:
            run = False

    group.update(event_list)

    window.fill(0)
    group.draw(window)
    pygame.display.flip()

pygame.quit()
exit()

Answer 2

For sprite management, a Sprite Group will help you.

So during setup, do something like:

all_sprites = pygame.sprite.Group()
# create five initial sprites
for number in range(5):
    new_sprite = animatedSprites(f"Sprite {number}")
    all_sprites.add(new_sprite)

Then during your event handling:

for event in pygame.event.get():
    if event.type == pygame.QUIT:
        # set termination condition here
        …
    elif event.type == pygame.MOUSEBUTTONDOWN:
        # use the click position in the name
        new_sprite = animatedSprites(f"Sprite X: {event.pos[0]} Y: {event.pos[1]}")
        all_sprites.add(new_sprite)

After processing events:

# update game state
all_sprites.update()
# draw background
…
# draw sprites
all_sprites.draw()
# update display
pygame.display.update()