1"""
2Using a Vertex Buffer Object With Lines
3
4If Python and Arcade are installed, this example can be run from the command line with:
5python -m arcade.examples.lines_buffered
6"""
7from __future__ import annotations
8
9import random
10import arcade
11from arcade.shape_list import (
12 ShapeElementList,
13 create_line_strip,
14)
15from inspect import getmembers
16from arcade.types import Color
17
18# Do the math to figure out our screen dimensions
19SCREEN_WIDTH = 800
20SCREEN_HEIGHT = 600
21SCREEN_TITLE = "Vertex Buffer Object With Lines Example"
22
23
24class MyGame(arcade.Window):
25 """
26 Main application class.
27 """
28
29 def __init__(self, width, height, title):
30 """
31 Set up the application.
32 """
33 super().__init__(width, height, title)
34 self.set_vsync(True)
35
36 self.shape_list = ShapeElementList()
37 point_list = ((0, 50),
38 (10, 10),
39 (50, 0),
40 (10, -10),
41 (0, -50),
42 (-10, -10),
43 (-50, 0),
44 (-10, 10),
45 (0, 50))
46
47 # Filter out anything other than a Color, such as imports and
48 # helper functions.
49 colors = [
50 color for name, color in
51 getmembers(arcade.color, lambda c: isinstance(c, Color))]
52
53 for i in range(200):
54 x = SCREEN_WIDTH // 2 - random.randrange(SCREEN_WIDTH)
55 y = SCREEN_HEIGHT // 2 - random.randrange(SCREEN_HEIGHT)
56 color = random.choice(colors)
57 points = [(px + x, py + y) for px, py in point_list]
58
59 my_line_strip = create_line_strip(points, color, 5)
60 self.shape_list.append(my_line_strip)
61
62 self.shape_list.center_x = SCREEN_WIDTH // 2
63 self.shape_list.center_y = SCREEN_HEIGHT // 2
64 self.shape_list.angle = 0
65
66 self.background_color = arcade.color.BLACK
67
68 def on_draw(self):
69 """
70 Render the screen.
71 """
72 # This command has to happen before we start drawing
73 self.clear()
74
75 self.shape_list.draw()
76
77 def on_update(self, delta_time):
78 self.shape_list.angle += 1 * 60 * delta_time
79 self.shape_list.center_x += 0.1 * 60 * delta_time
80 self.shape_list.center_y += 0.1 * 60 * delta_time
81
82
83def main():
84 MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
85 arcade.run()
86
87
88if __name__ == "__main__":
89 main()