69 lines
1.8 KiB
Python
69 lines
1.8 KiB
Python
"""
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This animation example shows how perform a radar sweep animation.
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If Python and Arcade are installed, this example can be run from the command line with:
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python -m arcade.examples.radar_sweep
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"""
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import arcade
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import math
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# Set up the constants
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SCREEN_WIDTH = 800
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SCREEN_HEIGHT = 600
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SCREEN_TITLE = "Radar Sweep Example"
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# These constants control the particulars about the radar
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CENTER_X = SCREEN_WIDTH // 2
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CENTER_Y = SCREEN_HEIGHT // 2
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RADIANS_PER_FRAME = 0.02
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SWEEP_LENGTH = 250
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def on_draw(delta_time):
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""" Use this function to draw everything to the screen. """
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# Move the angle of the sweep.
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on_draw.angle += RADIANS_PER_FRAME
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# Calculate the end point of our radar sweep. Using math.
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x = SWEEP_LENGTH * math.sin(on_draw.angle) + CENTER_X
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y = SWEEP_LENGTH * math.cos(on_draw.angle) + CENTER_Y
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# Start the render. This must happen before any drawing
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# commands. We do NOT need an stop render command.
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arcade.start_render()
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# Draw the radar line
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arcade.draw_line(CENTER_X, CENTER_Y, x, y, arcade.color.OLIVE, 4)
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# Draw the outline of the radar
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arcade.draw_circle_outline(CENTER_X, CENTER_Y, SWEEP_LENGTH,
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arcade.color.DARK_GREEN, 10)
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# This is a function-specific variable. Before we
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# use them in our function, we need to give them initial
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# values.
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on_draw.angle = 0
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def main():
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# Open up our window
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arcade.open_window(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
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arcade.set_background_color(arcade.color.BLACK)
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# Tell the computer to call the draw command at the specified interval.
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arcade.schedule(on_draw, 1 / 80)
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# Run the program
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arcade.run()
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# When done running the program, close the window.
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arcade.close_window()
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if __name__ == "__main__":
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main()
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