53 lines
1.1 KiB
Python
53 lines
1.1 KiB
Python
import math
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from pixel import Pixel
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def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float): # https://www.shadertoy.com/view/Wd23W3
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uv = (frag_coord[0] / resolution[0], frag_coord[1] / resolution[1])
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def hsv2rgb(h, s, v) -> tuple:
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r,g,b = 0,0,0
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i = int(h * 6)
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f = h * 6 - i
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p = v * (1 - s)
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q = v * (1 - f * s)
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t = v * (1 - (1 - f) * s)
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o = i % 6
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if o == 0:
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r,g,b = v,t,p
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elif o == 1:
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r,g,b = q,v,p
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elif o == 2:
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r,g,b = p,v,t
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elif o == 3:
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r,g,b = p,q,v
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elif o == 4:
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r,g,b = t,p,v
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else:
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r,g,b = v,p,q
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return r, g, b
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def step(edge: float, value: float) -> float:
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return 1.0 if value > edge else 0.0
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def strip(h: float, thickness: float, y: float) -> float:
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return step(y + h - thickness, step(1., y + h + thickness))
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col = [0.0, 0.0, 0.0]
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f = 0.0
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while f < math.pi * 2:
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a = strip(.5 + math.cos(uv[0] * 2. + time * 3.) * .15,
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.005,
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uv[1] + math.cos(uv[0] * 3. + time * 2. + f) * .25)
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_col = hsv2rgb(f / math.pi / 2., 1., 1.)
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for i in range(3):
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col[i] += a * _col[i]
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f += math.pi / 4.
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pixel.background_color.set(*col) |