37 lines
967 B
Python
37 lines
967 B
Python
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import math
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from pixel import Pixel
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COLOR_A = (0.0, 0.7, 0.8)
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COLOR_B = (0.8, 0.0, 0.7)
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HEIGHT = 6.0
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RADIUS = 1.
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def distance(a: tuple, b: tuple) -> float:
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if len(a) != len(b):
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raise TypeError("Mismatching dimentional vector passed")
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dist = 0
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for i in range(len(a)):
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d = b[i] - a[i]
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dist += d * d
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return dist ** 0.5
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def get_col(uv: tuple) -> tuple:
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uv = tuple(math.floor(x) for x in uv)
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return COLOR_A if ((uv[0] + uv[1]) % 2) == 0.0 else COLOR_B
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def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float): # https://www.shadertoy.com/view/lsyyDK
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uv = [ x * HEIGHT for x in (frag_coord[0] / resolution[1], frag_coord[1] / resolution[1]) ]
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direction = int(time) % 2
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shift = math.floor(uv[1 - direction])
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shift = 2.0 * (shift % 2) - 1.0
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uv[direction] += shift * time
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dist = 1.0 - distance((0.0, 0.0), tuple((x % 1.0) - 0.5 for x in uv)) / RADIUS
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col = tuple(x * dist for x in get_col(uv))
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pixel.background_color.set( *col )
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