Bouncing Rectangle#
This shows how to animate an item you can draw using the drawing primitives.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | """ This simple animation example shows how to bounce a rectangle on the screen. If Python and Arcade are installed, this example can be run from the command line with: python -m arcade.examples.bouncing_rectangle """ import arcade # --- Set up the constants # Size of the screen SCREEN_WIDTH = 600 SCREEN_HEIGHT = 600 SCREEN_TITLE = "Bouncing Rectangle Example" # Rectangle info RECT_WIDTH = 50 RECT_HEIGHT = 50 RECT_COLOR = arcade.color.DARK_BROWN BACKGROUND_COLOR = arcade.color.ALMOND class Item: """ This class represents our rectangle """ def __init__(self): # Set up attribute variables # Where we are self.center_x = 0 self.center_y = 0 # Where we are going self.change_x = 0 self.change_y = 0 def update(self): # Move the rectangle self.center_x += self.change_x self.center_y += self.change_y # Check if we need to bounce of right edge if self.center_x > SCREEN_WIDTH - RECT_WIDTH / 2: self.change_x *= -1 # Check if we need to bounce of top edge if self.center_y > SCREEN_HEIGHT - RECT_HEIGHT / 2: self.change_y *= -1 # Check if we need to bounce of left edge if self.center_x < RECT_WIDTH / 2: self.change_x *= -1 # Check if we need to bounce of bottom edge if self.center_y < RECT_HEIGHT / 2: self.change_y *= -1 def draw(self): # Draw the rectangle arcade.draw_rectangle_filled(self.center_x, self.center_y, RECT_WIDTH, RECT_HEIGHT, RECT_COLOR) class MyGame(arcade.Window): """ Main application class. """ def __init__(self, width, height, title): super().__init__(width, height, title) # Create our rectangle self.item = Item() self.item.center_x = 200 self.item.center_y = 300 self.item.change_x = 2 self.item.change_y = 3 # Set background color self.background_color = BACKGROUND_COLOR def on_update(self, delta_time): # Move the rectangle self.item.update() def on_draw(self): """ Render the screen. """ # Clear screen self.clear() # Draw the rectangle self.item.draw() def main(): """ Main function """ MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE) arcade.run() if __name__ == "__main__": main() |