105 lines
3.1 KiB
Python
105 lines
3.1 KiB
Python
"""
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Show how to have enemies shoot bullets at regular intervals.
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If Python and Arcade are installed, this example can be run from the command line with:
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python -m arcade.examples.sprite_bullets_periodic
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"""
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import arcade
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import os
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SCREEN_WIDTH = 800
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SCREEN_HEIGHT = 600
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SCREEN_TITLE = "Sprites and Periodic Bullets Example"
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class MyGame(arcade.Window):
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""" Main application class """
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def __init__(self):
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super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
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# Set the working directory (where we expect to find files) to the same
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# directory this .py file is in. You can leave this out of your own
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# code, but it is needed to easily run the examples using "python -m"
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# as mentioned at the top of this program.
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file_path = os.path.dirname(os.path.abspath(__file__))
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os.chdir(file_path)
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arcade.set_background_color(arcade.color.BLACK)
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# --- Keep track of a frame count.
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# --- This is important for doing things every x frames
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self.frame_count = 0
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self.player_list = arcade.SpriteList()
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self.enemy_list = arcade.SpriteList()
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self.bullet_list = arcade.SpriteList()
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# Add player ship
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self.player = arcade.Sprite("images/playerShip1_orange.png", 0.5)
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self.player_list.append(self.player)
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# Add top-left enemy ship
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enemy = arcade.Sprite("images/playerShip1_green.png", 0.5)
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enemy.center_x = 120
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enemy.center_y = SCREEN_HEIGHT - enemy.height
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enemy.angle = 180
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self.enemy_list.append(enemy)
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# Add top-right enemy ship
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enemy = arcade.Sprite("images/playerShip1_green.png", 0.5)
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enemy.center_x = SCREEN_WIDTH - 120
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enemy.center_y = SCREEN_HEIGHT - enemy.height
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enemy.angle = 180
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self.enemy_list.append(enemy)
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def on_draw(self):
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"""Render the screen. """
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arcade.start_render()
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self.enemy_list.draw()
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self.bullet_list.draw()
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self.player_list.draw()
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def update(self, delta_time):
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"""All the logic to move, and the game logic goes here. """
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# --- Add one to the frame count
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self.frame_count += 1
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# Loop through each enemy that we have
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for enemy in self.enemy_list:
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# --- Use the modulus to trigger doing something every 120 frames
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if self.frame_count % 120 == 0:
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bullet = arcade.Sprite("images/laserBlue01.png")
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bullet.center_x = enemy.center_x
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bullet.angle = -90
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bullet.top = enemy.bottom
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bullet.change_y = -2
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self.bullet_list.append(bullet)
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# Get rid of the bullet when it flies off-screen
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for bullet in self.bullet_list:
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if bullet.top < 0:
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bullet.kill()
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self.bullet_list.update()
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def on_mouse_motion(self, x, y, delta_x, delta_y):
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"""
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Called whenever the mouse moves.
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"""
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self.player.center_x = x
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self.player.center_y = 20
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def main():
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MyGame()
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arcade.run()
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if __name__ == "__main__":
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main()
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