PetscDrawUtilitySetCmap

Populate the RGB entries of a colormap from a named palette, honoring options-database overrides for the colormap name, reversal, and brightness.

Synopsis

#include "petscsys.h" 
PetscErrorCode PetscDrawUtilitySetCmap(const char colormap[], int mapsize, unsigned char R[], unsigned char G[], unsigned char B[])

Not Collective

Input Parameters

• colormap - the name of the colormap (e.g. "hue", "gray", "jet", "viridis"), or NULL/empty for the default

• mapsize - the number of colormap entries to fill

Output Parameters

• R - the red channel of length mapsize

• G - the green channel of length mapsize

• B - the blue channel of length mapsize

Options Database Keys

• -draw_cmap name - select the colormap by name

• -draw_cmap_reverse - reverse the colormap

• -draw_cmap_brighten value - brighten (positive) or darken (negative) the colormap; value must be in (-1, 1)

See Also

PetscDraw, PetscDrawUtilitySetGamma()

Level

developer

Location

src/sys/classes/draw/utils/cmap.c

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Index of all Draw routines
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Index of all manual pages