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73 lines
2.3 KiB
Python
73 lines
2.3 KiB
Python
1 year ago
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#!/usr/bin/env python
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from samplebase import SampleBase
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import math
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def scale_col(val, lo, hi):
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if val < lo:
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return 0
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if val > hi:
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return 255
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return 255 * (val - lo) / (hi - lo)
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def rotate(x, y, sin, cos):
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return x * cos - y * sin, x * sin + y * cos
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class RotatingBlockGenerator(SampleBase):
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def __init__(self, *args, **kwargs):
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super(RotatingBlockGenerator, self).__init__(*args, **kwargs)
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def run(self):
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cent_x = self.matrix.width / 2
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cent_y = self.matrix.height / 2
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rotate_square = min(self.matrix.width, self.matrix.height) * 1.41
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min_rotate = cent_x - rotate_square / 2
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max_rotate = cent_x + rotate_square / 2
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display_square = min(self.matrix.width, self.matrix.height) * 0.7
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min_display = cent_x - display_square / 2
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max_display = cent_x + display_square / 2
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deg_to_rad = 2 * 3.14159265 / 360
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rotation = 0
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# Pre calculate colors
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col_table = []
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for x in range(int(min_rotate), int(max_rotate)):
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col_table.insert(x, scale_col(x, min_display, max_display))
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offset_canvas = self.matrix.CreateFrameCanvas()
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while True:
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rotation += 1
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rotation %= 360
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# calculate sin and cos once for each frame
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angle = rotation * deg_to_rad
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sin = math.sin(angle)
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cos = math.cos(angle)
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for x in range(int(min_rotate), int(max_rotate)):
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for y in range(int(min_rotate), int(max_rotate)):
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# Our rotate center is always offset by cent_x
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rot_x, rot_y = rotate(x - cent_x, y - cent_x, sin, cos)
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if x >= min_display and x < max_display and y >= min_display and y < max_display:
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x_col = col_table[x]
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y_col = col_table[y]
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offset_canvas.SetPixel(rot_x + cent_x, rot_y + cent_y, x_col, 255 - y_col, y_col)
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else:
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offset_canvas.SetPixel(rot_x + cent_x, rot_y + cent_y, 0, 0, 0)
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offset_canvas = self.matrix.SwapOnVSync(offset_canvas)
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# Main function
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if __name__ == "__main__":
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rotating_block_generator = RotatingBlockGenerator()
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if (not rotating_block_generator.process()):
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rotating_block_generator.print_help()
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