141 lines
3.8 KiB
Python
141 lines
3.8 KiB
Python
"""
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Move Sprite by Angle
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Simple program to show basic sprite usage.
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Artwork from http://kenney.nl
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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_move_angle
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"""
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import arcade
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import os
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import math
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SPRITE_SCALING = 0.5
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SCREEN_WIDTH = 800
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SCREEN_HEIGHT = 600
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SCREEN_TITLE = "Move Sprite by Angle Example"
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MOVEMENT_SPEED = 5
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ANGLE_SPEED = 5
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class Player(arcade.Sprite):
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""" Player class """
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def __init__(self, image, scale):
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""" Set up the player """
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# Call the parent init
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super().__init__(image, scale)
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# Create a variable to hold our speed. 'angle' is created by the parent
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self.speed = 0
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def update(self):
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# Convert angle in degrees to radians.
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angle_rad = math.radians(self.angle)
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# Rotate the ship
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self.angle += self.change_angle
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# Use math to find our change based on our speed and angle
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self.center_x += -self.speed * math.sin(angle_rad)
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self.center_y += self.speed * math.cos(angle_rad)
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class MyGame(arcade.Window):
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"""
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Main application class.
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"""
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def __init__(self, width, height, title):
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"""
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Initializer
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"""
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# Call the parent class initializer
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super().__init__(width, height, 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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# Variables that will hold sprite lists
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self.player_list = None
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# Set up the player info
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self.player_sprite = None
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# Set the background color
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arcade.set_background_color(arcade.color.BLACK)
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def setup(self):
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""" Set up the game and initialize the variables. """
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# Sprite lists
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self.player_list = arcade.SpriteList()
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# Set up the player
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self.player_sprite = Player("images/playerShip1_orange.png", SPRITE_SCALING)
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self.player_sprite.center_x = SCREEN_WIDTH / 2
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self.player_sprite.center_y = SCREEN_HEIGHT / 2
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self.player_list.append(self.player_sprite)
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def on_draw(self):
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"""
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Render the screen.
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"""
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# This command has to happen before we start drawing
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arcade.start_render()
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# Draw all the sprites.
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self.player_list.draw()
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def update(self, delta_time):
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""" Movement and game logic """
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# Call update on all sprites (The sprites don't do much in this
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# example though.)
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self.player_list.update()
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def on_key_press(self, key, modifiers):
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"""Called whenever a key is pressed. """
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# Forward/back
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if key == arcade.key.UP:
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self.player_sprite.speed = MOVEMENT_SPEED
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elif key == arcade.key.DOWN:
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self.player_sprite.speed = -MOVEMENT_SPEED
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# Rotate left/right
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elif key == arcade.key.LEFT:
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self.player_sprite.change_angle = ANGLE_SPEED
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elif key == arcade.key.RIGHT:
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self.player_sprite.change_angle = -ANGLE_SPEED
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def on_key_release(self, key, modifiers):
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"""Called when the user releases a key. """
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if key == arcade.key.UP or key == arcade.key.DOWN:
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self.player_sprite.speed = 0
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elif key == arcade.key.LEFT or key == arcade.key.RIGHT:
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self.player_sprite.change_angle = 0
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def main():
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""" Main method """
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window = MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
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window.setup()
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arcade.run()
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if __name__ == "__main__":
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main()
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