Scheme:   monochromatic contrast (base + complement) soft contrast (split complements) double-contrast (2 neighbors + complements) analogic (base + neighbors)

Distance [0 to 60°]:   °   0° - contrast, 60° - triade   Use it

Distance [-90 to 90°]:   °   (90° - tetrade)   Use it

Distance [0 to 60°]   °   add the complement   Use it