Drawing Shapes with Classes

Screenshot of Shapes example program
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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
"""
This simple animation example shows how to use classes to animate
multiple objects on the screen at the same time.

Because this is redraws the shapes from scratch each frame, this is SLOW
and inefficient.

Using buffered drawing commands (Vertex Buffer Objects) is a bit more complex,
but faster.

See http://arcade.academy/examples/index.html#shape-lists for some examples.

Also, any Sprite class put in a SpriteList and drawn with the SpriteList will
be drawn using Vertex Buffer Objects for better performance.

If Python and Arcade are installed, this example can be run from the command line with:
python -m arcade.examples.shapes
"""

import arcade
import random

# Set up the constants
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
SCREEN_TITLE = "Shapes!"

RECT_WIDTH = 50
RECT_HEIGHT = 50

NUMBER_OF_SHAPES = 200


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 MyGame(arcade.Window):
    """ Main application class. """

    def __init__(self):
        super().__init__(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
        self.shape_list = None

    def setup(self):
        """ Set up the game and initialize the variables. """
        self.shape_list = []

        for i in range(NUMBER_OF_SHAPES):
            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 on_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()


def main():
    window = MyGame()
    window.setup()
    arcade.run()


if __name__ == "__main__":
    main()