#https://www.shadertoy.com/view/4sXSz2

pixels = W:1024 H:1024

x = from -0.5 to 0.5 W
y = from 0 to 1 H

t = 56.29

angle = atan2(y,x)/(2.0*PI)
angle = if(angle <0.0, angle+1, angle)
dis = length2(x, y)

angle = angle+ cos(dis*PI - t*5.2)*0.1
color = cos(angle*2.0*PI*20.0)

r = 0.2*color
g = 0.1*color
b = 0.9*color

