Gradients Example#
gradients.py#
1"""
2Drawing Gradients
3
4If Python and Arcade are installed, this example can be run from the command line with:
5python -m arcade.examples.gradients
6"""
7from __future__ import annotations
8
9import arcade
10from arcade import shape_list
11
12# Do the math to figure out our screen dimensions
13SCREEN_WIDTH = 800
14SCREEN_HEIGHT = 600
15SCREEN_TITLE = "Gradients Example"
16
17
18class MyGame(arcade.Window):
19 """
20 Main application class.
21 """
22
23 def __init__(self, width, height, title):
24 """
25 Set up the application.
26 """
27
28 super().__init__(width, height, title)
29
30 self.background_color = arcade.color.BLACK
31
32 self.shapes = shape_list.ShapeElementList()
33
34 # This is a large rectangle that fills the whole
35 # background. The gradient goes between the two colors
36 # top to bottom.
37 color1 = (215, 214, 165)
38 color2 = (219, 166, 123)
39 points = (0, 0), (SCREEN_WIDTH, 0), (SCREEN_WIDTH, SCREEN_HEIGHT), (0, SCREEN_HEIGHT)
40 colors = (color1, color1, color2, color2)
41 rect = shape_list.create_rectangle_filled_with_colors(points, colors)
42 self.shapes.append(rect)
43
44 # Another rectangle, but in this case the color doesn't change. Just the
45 # transparency. This time it goes from left to right.
46 color1 = (165, 92, 85, 255)
47 color2 = (165, 92, 85, 0)
48 points = (100, 100), (SCREEN_WIDTH - 100, 100), (SCREEN_WIDTH - 100, 300), (100, 300)
49 colors = (color2, color1, color1, color2)
50 rect = shape_list.create_rectangle_filled_with_colors(points, colors)
51 self.shapes.append(rect)
52
53 # Two lines
54 color1 = (7, 67, 88)
55 color2 = (69, 137, 133)
56 points = (100, 400), (SCREEN_WIDTH - 100, 400), (SCREEN_WIDTH - 100, 500), (100, 500)
57 colors = [color2, color1, color2, color1]
58 shape = shape_list.create_lines_with_colors(points, colors, line_width=5)
59 self.shapes.append(shape)
60
61 # Triangle
62 color1 = (215, 214, 165)
63 color2 = (219, 166, 123)
64 color3 = (165, 92, 85)
65 points = (SCREEN_WIDTH // 2, 500), (SCREEN_WIDTH // 2 - 100, 400), (SCREEN_WIDTH // 2 + 100, 400)
66 colors = (color1, color2, color3)
67 shape = shape_list.create_triangles_filled_with_colors(points, colors)
68 self.shapes.append(shape)
69
70 # Ellipse, gradient between center and outside
71 color1 = (69, 137, 133, 127)
72 color2 = (7, 67, 88, 127)
73 shape = shape_list.create_ellipse_filled_with_colors(SCREEN_WIDTH // 2, 350, 50, 50,
74 inside_color=color1, outside_color=color2)
75 self.shapes.append(shape)
76
77 def on_draw(self):
78 """
79 Render the screen.
80 """
81
82 # This command has to happen before we start drawing
83 self.clear()
84 self.shapes.draw()
85 # arcade.draw_rectangle_filled(500, 500, 50, 50, (255, 0, 0, 127))
86
87
88def main():
89
90 MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
91 arcade.run()
92
93
94if __name__ == "__main__":
95 main()