第6步： Python#

../../_images/step_06.png
step_06.py#
  1import random
  2
  3import arcade
  4from arcade.experimental import Shadertoy
  5
  6# Do the math to figure out our screen dimensions
  7SCREEN_WIDTH = 800
  8SCREEN_HEIGHT = 600
  9SCREEN_TITLE = "Ray-casting Demo"
 10
 11SPRITE_SCALING = 0.25
 12
 13# How fast the camera pans to the player. 1.0 is instant.
 14CAMERA_SPEED = 0.1
 15
 16PLAYER_MOVEMENT_SPEED = 7
 17BOMB_COUNT = 70
 18PLAYING_FIELD_WIDTH = 1600
 19PLAYING_FIELD_HEIGHT = 1600
 20
 21
 22class MyGame(arcade.Window):
 23
 24    def __init__(self, width, height, title):
 25        super().__init__(width, height, title)
 26
 27        # The shader toy and 'channels' we'll be using
 28        self.shadertoy = None
 29        self.channel0 = None
 30        self.channel1 = None
 31        self.load_shader()
 32
 33        # Sprites and sprite lists
 34        self.player_sprite = None
 35        self.wall_list = arcade.SpriteList()
 36        self.player_list = arcade.SpriteList()
 37        self.bomb_list = arcade.SpriteList()
 38        self.physics_engine = None
 39
 40        self.generate_sprites()
 41        self.background_color = arcade.color.ARMY_GREEN
 42
 43    def load_shader(self):
 44        # Size of the window
 45        window_size = self.get_size()
 46
 47        # Create the shader toy, passing in a path for the shader source
 48        self.shadertoy = Shadertoy.create_from_file(window_size, "step_06.glsl")
 49
 50        # Create the channels 0 and 1 frame buffers.
 51        # Make the buffer the size of the window, with 4 channels (RGBA)
 52        self.channel0 = self.shadertoy.ctx.framebuffer(
 53            color_attachments=[self.shadertoy.ctx.texture(window_size, components=4)]
 54        )
 55        self.channel1 = self.shadertoy.ctx.framebuffer(
 56            color_attachments=[self.shadertoy.ctx.texture(window_size, components=4)]
 57        )
 58
 59        # Assign the frame buffers to the channels
 60        self.shadertoy.channel_0 = self.channel0.color_attachments[0]
 61        self.shadertoy.channel_1 = self.channel1.color_attachments[0]
 62
 63    def generate_sprites(self):
 64        # -- Set up several columns of walls
 65        for x in range(0, PLAYING_FIELD_WIDTH, 128):
 66            for y in range(0, PLAYING_FIELD_HEIGHT, int(128 * SPRITE_SCALING)):
 67                # Randomly skip a box so the player can find a way through
 68                if random.randrange(2) > 0:
 69                    wall = arcade.Sprite(":resources:images/tiles/boxCrate_double.png", SPRITE_SCALING)
 70                    wall.center_x = x
 71                    wall.center_y = y
 72                    self.wall_list.append(wall)
 73
 74        # -- Set some hidden bombs in the area
 75        for i in range(BOMB_COUNT):
 76            bomb = arcade.Sprite(":resources:images/tiles/bomb.png", 0.25)
 77            placed = False
 78            while not placed:
 79                bomb.center_x = random.randrange(PLAYING_FIELD_WIDTH)
 80                bomb.center_y = random.randrange(PLAYING_FIELD_HEIGHT)
 81                if not arcade.check_for_collision_with_list(bomb, self.wall_list):
 82                    placed = True
 83            self.bomb_list.append(bomb)
 84
 85        # Create the player
 86        self.player_sprite = arcade.Sprite(":resources:images/animated_characters/female_person/femalePerson_idle.png",
 87                                           scale=SPRITE_SCALING)
 88        self.player_sprite.center_x = 256
 89        self.player_sprite.center_y = 512
 90        self.player_list.append(self.player_sprite)
 91
 92        # Physics engine, so we don't run into walls
 93        self.physics_engine = arcade.PhysicsEngineSimple(self.player_sprite, self.wall_list)
 94
 95    def on_draw(self):
 96        # Select the channel 0 frame buffer to draw on
 97        self.channel0.use()
 98        self.channel0.clear()
 99        # Draw the walls
100        self.wall_list.draw()
101
102        self.channel1.use()
103        self.channel1.clear()
104        # Draw the bombs
105        self.bomb_list.draw()
106
107        # Select this window to draw on
108        self.use()
109        # Clear to background color
110        self.clear()
111        # Run the shader and render to the window
112        self.shadertoy.program['lightPosition'] = self.player_sprite.position
113        self.shadertoy.program['lightSize'] = 300
114        self.shadertoy.render()
115
116        # Draw the walls
117        self.wall_list.draw()
118
119        # Draw the player
120        self.player_list.draw()
121
122    def on_key_press(self, key, modifiers):
123        """Called whenever a key is pressed. """
124
125        if key == arcade.key.UP:
126            self.player_sprite.change_y = PLAYER_MOVEMENT_SPEED
127        elif key == arcade.key.DOWN:
128            self.player_sprite.change_y = -PLAYER_MOVEMENT_SPEED
129        elif key == arcade.key.LEFT:
130            self.player_sprite.change_x = -PLAYER_MOVEMENT_SPEED
131        elif key == arcade.key.RIGHT:
132            self.player_sprite.change_x = PLAYER_MOVEMENT_SPEED
133
134    def on_key_release(self, key, modifiers):
135        """Called when the user releases a key. """
136
137        if key == arcade.key.UP or key == arcade.key.DOWN:
138            self.player_sprite.change_y = 0
139        elif key == arcade.key.LEFT or key == arcade.key.RIGHT:
140            self.player_sprite.change_x = 0
141
142    def on_update(self, delta_time):
143        """ Movement and game logic """
144
145        # Call update on all sprites (The sprites don't do much in this
146        # example though.)
147        self.physics_engine.update()
148
149
150if __name__ == "__main__":
151    MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
152    arcade.run()