Spawning Multiple of the same sprite

pygame

Solution

The part of the spawn procedure you posted doesn't create any new instances. Unless `redI` is declared as a new `Red_Infantry` somewhere else, you need to modify the code to create a new instance of `Red_Infantry` every time you want to spawn a soldier.

sprites.append(Red_Infantry())

To update the sprites:

for sprite in sprites:
    sprite.update()

Put movement and other state changes in the update method. This is what pygame expects, but you can use a different style if you want. The main point is you must have multiple instances of `Red_Infantry` in order to see multiple sprites.

You could also use pygame's Group class instead of a simple list to hold the sprites.

Here's a full example that uses `Group` instead of list. In the example, an `Enemy` is spawned each time a key is pressed. Each `Enemy` prints its unique ID to stdout.

import sys
import random

import pygame
from pygame.locals import *

def main():
    pygame.init()
    screen = pygame.display.set_mode((480, 320))
    enemies = pygame.sprite.Group()
    while True:
        for event in pygame.event.get():
            if event.type == KEYDOWN:
                enemies.add(Enemy(screen))
            elif event.type == QUIT:
                sys.exit()
        enemies.update()
        screen.fill(pygame.Color("black"))
        enemies.draw(screen)
        pygame.display.update()

class Enemy(pygame.sprite.Sprite):

    def __init__(self, screen):
        pygame.sprite.Sprite.__init__(self)
        print "created a new sprite:", id(self)
        self.image = pygame.image.load("sprite.png")
        self.rect = self.image.get_rect()
        self.rect.move_ip(random.randint(0, screen.get_width()),
                          random.randint(0, screen.get_height()))

    def update(self):
        self.rect.move_ip(random.randint(-3, 3), 0)

if __name__ == "__main__":
    main()

Problem

I am currently working on a game called Table Wars, a turn based strategy game for two players. Progress has been going smoothly, until I ran into a problem with spawning units. The program won't spawn multiple of the same unit, or respawn new ones after the old ones die. Here is some information that may help: - Each class is stored in a variable: (`redI = Red_Infantry()`) - All functions are stored in the main loop. - The sprite classes have hard-coded X and Y values, used when spawning units and moving units. What should I do? As requested, here is the class for the Red Infantry: ``` class Red_Infantry(pygame.sprite.Sprite): def __init__(self): pygame.sprite.Sprite.__init__(self) self.image, self.rect = load_image('Soldier_red.png', -1) self.selected = 0 self.area = screen.get_rect() self.rect.topleft = (100, 300) self.health = 100 #Soldiers are have mediocre toughness. self.attack_damage = 25 self.range_maximum = 20 #in pixels, this is melee range self.range_minimum = 0 self.update() def update(self): if self.health <= 0: self.kill() ``` and the code to spawn this unit: ``` if spawned_units < 3 and PHASE == 1 and TURN == 'Red': if REDGOLD < 10: print "Out of money! Moving to Phase 2!" PHASE = 2 spawned_units = 0 elif event.type == KEYDOWN and event.key == K_1: if REDGOLD >= 10 and REDCOMMAND >= 5: Sprites.append(redI) REDGOLD -= 10 REDCOMMAND -= 5 spawned_units = spawned_units + 1 else: print "Not enough gold!" ``` This is similar style with all units. It performs correctly the first time, but not in the second, third, and so on, meaning I can only have one Soldier. Also, when that soldier dies via self.kill, it won't come back if I try to spawn it.

Original source