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"""
7import arcade
8from arcade import shape_list
9
10# Do the math to figure out our screen dimensions
11WINDOW_WIDTH = 1280
12WINDOW_HEIGHT = 720
13WINDOW_TITLE = "Gradients Example"
14
15
16class GameView(arcade.View):
17 """
18 Main application class.
19 """
20
21 def __init__(self):
22 """
23 Set up the application.
24 """
25
26 super().__init__()
27
28 self.background_color = arcade.color.BLACK
29
30 self.shapes = shape_list.ShapeElementList()
31
32 # This is a large rectangle that fills the whole
33 # background. The gradient goes between the two colors
34 # top to bottom.
35 color1 = (215, 214, 165)
36 color2 = (219, 166, 123)
37 points = (
38 (0, 0),
39 (WINDOW_WIDTH, 0),
40 (WINDOW_WIDTH, WINDOW_HEIGHT),
41 (0, WINDOW_HEIGHT),
42 )
43 colors = (color1, color1, color2, color2)
44 rect = shape_list.create_rectangle_filled_with_colors(points, colors)
45 self.shapes.append(rect)
46
47 # Another rectangle, but in this case the color doesn't change. Just the
48 # transparency. This time it goes from left to right.
49 color1 = (165, 92, 85, 255)
50 color2 = (165, 92, 85, 0)
51 points = (
52 (100, 100),
53 (WINDOW_WIDTH - 100, 100),
54 (WINDOW_WIDTH - 100, 300),
55 (100, 300),
56 )
57 colors = (color2, color1, color1, color2)
58 rect = shape_list.create_rectangle_filled_with_colors(points, colors)
59 self.shapes.append(rect)
60
61 # Two lines
62 color1 = (7, 67, 88)
63 color2 = (69, 137, 133)
64 points = (
65 (100, 400),
66 (WINDOW_WIDTH - 100, 400),
67 (WINDOW_WIDTH - 100, 500),
68 (100, 500),
69 )
70 colors = [color2, color1, color2, color1]
71 shape = shape_list.create_lines_with_colors(points, colors, line_width=5)
72 self.shapes.append(shape)
73
74 # Triangle
75 color1 = (215, 214, 165)
76 color2 = (219, 166, 123)
77 color3 = (165, 92, 85)
78 points = (
79 (WINDOW_WIDTH // 2, 500),
80 (WINDOW_WIDTH // 2 - 100, 400),
81 (WINDOW_WIDTH // 2 + 100, 400),
82 )
83 colors = (color1, color2, color3)
84 shape = shape_list.create_triangles_filled_with_colors(points, colors)
85 self.shapes.append(shape)
86
87 # Ellipse, gradient between center and outside
88 color1 = (69, 137, 133, 127)
89 color2 = (7, 67, 88, 127)
90 shape = shape_list.create_ellipse_filled_with_colors(
91 WINDOW_WIDTH // 2, 350, 50, 50,
92 inside_color=color1, outside_color=color2,
93 )
94 self.shapes.append(shape)
95
96 def on_draw(self):
97 """
98 Render the screen.
99 """
100
101 # This command has to happen before we start drawing
102 self.clear()
103 self.shapes.draw()
104 # arcade.draw_rectangle_filled(500, 500, 50, 50, (255, 0, 0, 127))
105
106
107def main():
108 """ Main function """
109 # Create a window class. This is what actually shows up on screen
110 window = arcade.Window(WINDOW_WIDTH, WINDOW_HEIGHT, WINDOW_TITLE)
111
112 # Create the GameView
113 game = GameView()
114
115 # Show GameView on screen
116 window.show_view(game)
117
118 # Start the arcade game loop
119 arcade.run()
120
121
122if __name__ == "__main__":
123 main()