shade : a shade modifier passed to the color lookup if palette name or object is given

paletteonly : if given, both colors are chosen from the palette instead of one of them being generated

CoolWarmPair returns a list of two colors that can be used for a "cool" to "warm" gradient (or light to dark in the case of grayscale). One of the colors returned is always the first color from the palette provided, and the other color is a computed contrasting color.

An exception is made for the case of the CVD palettes, in which case the return is always the first two colors of those palettes.

$\mathrm{plotpalettes}≔\mathrm{select}\left(p\mapsto :-\mathrm{GetPaletteType}\left(\mathrm{ColorTools}:-\mathrm{GetPalette}\left(p\right)\right)\mathbf{in}\left[''fill''\,''line''\right]\,\mathrm{ColorTools}:-\mathrm{PaletteNames}\left(\right)\right)$

$\mathrm{plotpalettes}≔\left[''Bright''\,''Dalton''\,''Executive''\,''Mono''\,''Nautical''\,''Niagara''\,''Patchwork''\,''Spring''\,''CVD''\,''CVD2''\,''CVD3''\right]$

$\mathrm{CWpairs}≔\left[\mathrm{seq}\left(\left[p\,\mathrm{ColorTools}:-\mathrm{CoolWarmPair}\left(p\right)\left[\right]\right]\,p\mathbf{in}\mathrm{plotpalettes}\right)\right]$

$\mathrm{CWpairs}≔\left[\left[''Bright''\,⟨RGB\; :\; 0.2\; 0.4\; 0.8⟩\,⟨RGB\; :\; 0.898\; 0.331\; 0.313⟩\right]\,\left[''Dalton''\,⟨RGB\; :\; 0.337\; 0.706\; 0.914⟩\,⟨RGB\; :\; 0.796\; 0.324\; 0.484⟩\right]\,\left[''Executive''\,⟨RGB\; :\; 0.271\; 0.451\; 0.655⟩\,⟨RGB\; :\; 0.847\; 0.427\; 0.464⟩\right]\,\left[''Mono''\,⟨Gs\; :\; 0.597⟩\,⟨Gs\; :\; 0.18⟩\right]\,\left[''Nautical''\,⟨RGB\; :\; 0.2\; 0.302\; 0.392⟩\,⟨RGB\; :\; 0.613\; 0.362\; 0.403⟩\right]\,\left[''Niagara''\,⟨RGB\; :\; 0.229\; 0.403\; 0.782⟩\,⟨RGB\; :\; 0.471\; 0\; 0.0549⟩\right]\,\left[''Patchwork''\,⟨RGB\; :\; 0.267\; 0.424\; 0.702⟩\,⟨RGB\; :\; 0.862\; 0.394\; 0.38⟩\right]\,\left[''Spring''\,⟨RGB\; :\; 0\; 0.455\; 0.8⟩\,⟨RGB\; :\; 0.93\; 0.342\; 0.421⟩\right]\,\left[''CVD''\,⟨RGB\; :\; 0\; 0.353\; 0.784⟩\,⟨RGB\; :\; 0.98\; 0.471\; 0.314⟩\right]\,\left[''CVD2''\,⟨RGB\; :\; 0\; 0.431\; 0.51⟩\,⟨RGB\; :\; 0.941\; 0.941\; 0.196⟩\right]\,\left[''CVD3''\,⟨RGB\; :\; 0\; 0.431\; 0.51⟩\,⟨RGB\; :\; 0.98\; 0.471\; 0.314⟩\right]\right]$

$\mathrm{DocumentTools}:-\mathrm{Tabulate}\left(\left[\left[''Palette\; Name''\,''Cool''\,''Warm''\right]\,\mathrm{map}\left(r\mapsto \left[r\left[1\right]\,''\backslash n''\,''\backslash n''\right]\,\mathrm{CWpairs}\right)\left[\right]\right]\,\mathrm{`=`}\left(\mathrm{fillcolor}\,\left(M\,i\,j\right)\mapsto \mathrm{ifelse}\left(i=1\,''LightGrey''\,\mathrm{ifelse}\left(j=1\,''White''\,\mathrm{ColorTools}:-\mathrm{RGB24ToHex}\left(:-\mathrm{ToRGB24}\left(\mathrm{CWpairs}\left[i-1\right]\left[j\right]\right)\right)\right)\right)\right)\right)\:$

The ColorTools:-CoolWarmPair command was introduced in Maple 2023.

For more information on Maple 2023 changes, see Updates in Maple 2023.