#https://www.shadertoy.com/view/Mts3D2

pixels = W:1024 H:1024

x = from -5 to 5 W
y = from -5 to 5 H

t = 90.38

angle = atan2(y, x)/(PI*2.0)+0.5
len = length2(x, y)
rainbow = angle*PI*8.0+cos(len*16.0+t*2.0)*0.4+len*8.0+t*4.0

r = cos(rainbow)+0.5
g = cos(rainbow+PI*2.0/3.0)+0.5
b = cos(rainbow+PI*4.0/3.0)+0.5
