$$
x=y
$$

red=$${-\frac{1}{2.0}\times\cos(\frac{2\times3.14\times x}{s-1})+\frac{1}{2.0}}$$

green=$${-\frac{1}{2.0}\times\cos(\frac{2\times3.14\times y}{s-1})+\frac{1}{2.0}}$$

blue=$${\frac{1}{2.0}\times\cos(\frac{2\times2\times3.14\times\frac{x+y}{2.0}}{s-1})+\frac{1}{2.0}}$$

red=-1/2.0*cos(2*3.14*x/(s-1))+1/2.0
green=-1/2.0*cos(2*3.14*y/(s-1))+1/2.0
blue=1/2.0*cos(2*2*3.14*((x+y)/2.0)/(s-1))+1/2.0