"""
This simple animation example shows how to move an item with the keyboard.
"""
import arcade
# Set up the constants
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
RECT_WIDTH = 50
RECT_HEIGHT = 50
MOVEMENT_SPEED = 5
class Rectangle:
""" Class to represent a rectangle on the screen """
def __init__(self, x, y, width, height, angle, color):
""" Initialize our rectangle variables """
# Position
self.x = x
self.y = y
# Vector
self.delta_x = 0
self.delta_y = 0
# Size and rotation
self.width = width
self.height = height
self.angle = angle
# Color
self.color = color
def draw(self):
""" Draw our rectangle """
arcade.draw_rectangle_filled(self.x, self.y, self.width, self.height,
self.color, self.angle)
def move(self):
""" Move our rectangle """
# Move left/right
self.x += self.delta_x
# See if we've gone beyond the border. If so, reset our position
# back to the border.
if self.x < RECT_WIDTH // 2:
self.x = RECT_WIDTH // 2
if self.x > SCREEN_WIDTH - (RECT_WIDTH // 2):
self.x = SCREEN_WIDTH - (RECT_WIDTH // 2)
# Move up/down
self.y += self.delta_y
# Check top and bottom boundaries
if self.y < RECT_HEIGHT // 2:
self.y = RECT_HEIGHT // 2
if self.y > SCREEN_HEIGHT - (RECT_HEIGHT // 2):
self.y = SCREEN_HEIGHT - (RECT_HEIGHT // 2)
class MyApplication(arcade.Window):
"""
Main application class.
"""
def __init__(self, width, height):
super().__init__(width, height, title="Keyboard control")
self.player = None
self.left_down = False
def setup(self):
""" Set up the game and initialize the variables. """
width = RECT_WIDTH
height = RECT_HEIGHT
x = SCREEN_WIDTH // 2
y = SCREEN_HEIGHT // 2
angle = 0
color = arcade.color.WHITE
self.player = Rectangle(x, y, width, height, angle, color)
self.left_down = False
def animate(self, dt):
""" Move everything """
self.player.move()
def on_draw(self):
"""
Render the screen.
"""
arcade.start_render()
self.player.draw()
def on_key_press(self, key, modifiers):
"""
Called whenever the mouse moves.
"""
if key == arcade.key.UP:
self.player.delta_y = MOVEMENT_SPEED
elif key == arcade.key.DOWN:
self.player.delta_y = -MOVEMENT_SPEED
elif key == arcade.key.LEFT:
self.player.delta_x = -MOVEMENT_SPEED
elif key == arcade.key.RIGHT:
self.player.delta_x = MOVEMENT_SPEED
def on_key_release(self, key, modifiers):
"""
Called when the user presses a mouse button.
"""
if key == arcade.key.UP or key == arcade.key.DOWN:
self.player.delta_y = 0
elif key == arcade.key.LEFT or key == arcade.key.RIGHT:
self.player.delta_x = 0
def main():
window = MyApplication(SCREEN_WIDTH, SCREEN_HEIGHT)
window.setup()
arcade.run()
main()
