# Drawing Shapes with Classes¶

shapes.py
  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 99 100 101 102 103 104 105 106 107 108 109 110 """ This simple animation example shows how to use classes to animate multple objects on the screen at the same time. Because this is redraws the shapes from scratch each frame, this is slow and inefficient, but we'll show how to make it faster in the chapter on performance. """ import arcade import random # Set up the constants SCREEN_WIDTH = 800 SCREEN_HEIGHT = 600 RECT_WIDTH = 50 RECT_HEIGHT = 50 class Shape: def __init__(self, x, y, width, height, angle, delta_x, delta_y, delta_angle, color): self.x = x self.y = y self.width = width self.height = height self.angle = angle self.delta_x = delta_x self.delta_y = delta_y self.delta_angle = delta_angle self.color = color def move(self): self.x += self.delta_x self.y += self.delta_y self.angle += self.delta_angle class Ellipse(Shape): def draw(self): arcade.draw_ellipse_filled(self.x, self.y, self.width, self.height, self.color, self.angle) class Rectangle(Shape): def draw(self): arcade.draw_rectangle_filled(self.x, self.y, self.width, self.height, self.color, self.angle) class MyApplication(arcade.Window): """ Main application class. """ def __init__(self): super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, title="Shapes!") self.shape_list = None def setup(self): """ Set up the game and initialize the variables. """ self.shape_list = [] for i in range(100): x = random.randrange(0, SCREEN_WIDTH) y = random.randrange(0, SCREEN_HEIGHT) width = random.randrange(10, 30) height = random.randrange(10, 30) angle = random.randrange(0, 360) d_x = random.randrange(-3, 4) d_y = random.randrange(-3, 4) d_angle = random.randrange(-3, 4) red = random.randrange(256) green = random.randrange(256) blue = random.randrange(256) alpha = random.randrange(256) shape_type = random.randrange(2) if shape_type == 0: shape = Rectangle(x, y, width, height, angle, d_x, d_y, d_angle, (red, green, blue, alpha)) else: shape = Ellipse(x, y, width, height, angle, d_x, d_y, d_angle, (red, green, blue, alpha)) self.shape_list.append(shape) def update(self, dt): """ Move everything """ for shape in self.shape_list: shape.move() def on_draw(self): """ Render the screen. """ arcade.start_render() for shape in self.shape_list: shape.draw() window = MyApplication() window.setup() arcade.run()