Radar Sweep#
radar_sweep.py#
1"""
2This animation example shows how perform a radar sweep animation.
3
4If Python and Arcade are installed, this example can be run from the command line with:
5python -m arcade.examples.radar_sweep
6"""
7from __future__ import annotations
8
9import arcade
10import math
11
12# Set up the constants
13SCREEN_WIDTH = 800
14SCREEN_HEIGHT = 600
15SCREEN_TITLE = "Radar Sweep Example"
16
17# These constants control the particulars about the radar
18CENTER_X = SCREEN_WIDTH // 2
19CENTER_Y = SCREEN_HEIGHT // 2
20RADIANS_PER_FRAME = 0.02
21SWEEP_LENGTH = 250
22
23
24class Radar:
25 def __init__(self):
26 self.angle = 0
27
28 def update(self, delta_time=0):
29 # Move the angle of the sweep.
30 self.angle += RADIANS_PER_FRAME * delta_time
31
32 def draw(self):
33 """ Use this function to draw everything to the screen. """
34
35 # Calculate the end point of our radar sweep. Using math.
36 x = SWEEP_LENGTH * math.sin(self.angle) + CENTER_X
37 y = SWEEP_LENGTH * math.cos(self.angle) + CENTER_Y
38
39 # Draw the radar line
40 arcade.draw_line(CENTER_X, CENTER_Y, x, y, arcade.color.OLIVE, 4)
41
42 # Draw the outline of the radar
43 arcade.draw_circle_outline(CENTER_X,
44 CENTER_Y,
45 SWEEP_LENGTH,
46 arcade.color.DARK_GREEN,
47 border_width=10,
48 num_segments=60)
49
50
51class MyGame(arcade.Window):
52 """ Main application class. """
53
54 def __init__(self, width, height, title):
55 super().__init__(width, height, title)
56
57 # Create our rectangle
58 self.radar = Radar()
59
60 # Set background color
61 self.background_color = arcade.color.BLACK
62
63 def on_update(self, delta_time):
64 # Move the rectangle
65 self.radar.update(delta_time * 60)
66
67 def on_draw(self):
68 """Draw the screen"""
69 # Clear screen
70 self.clear()
71 # Draw the rectangle
72 self.radar.draw()
73
74
75def main():
76 """ Main function """
77 MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
78 arcade.run()
79
80
81if __name__ == "__main__":
82 main()