Add -Ccpt option to sample colors from sample1d and grdxyz#8195
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PaulWessel merged 3 commits intomasterfrom Dec 16, 2023
Merged
Add -Ccpt option to sample colors from sample1d and grdxyz#8195PaulWessel merged 3 commits intomasterfrom
PaulWessel merged 3 commits intomasterfrom
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We had no simple ways to determine what teh color would be for a given z value (other than under the hood for plotting). This PR lets sample1d and grd2xyz optionally take -Ccpt. This lets sample1d look up the color based on the input records last column (or via -i) while gr2xyz will get the color based on the grid z-values. Both modules then adds 4 new columns r, g, b, a to their output. Note: grd2xyz already used -Ci|f for some formatting that is rarely used. I changed this to -F and made -Ci|f backwards compatible of course.
joa-quim
approved these changes
Dec 16, 2023
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We had no simple way to determine what the colour would be for a given z value (other than under the hood for the usual plotting). This PR lets sample1d and grd2xyz optionally take -Ccpt. This lets sample1d look up the colour based on the input records' last column (or via -i) while grd2xyz will get the colour based on the grid z-values. Both modules then add 4 new columns r, g, b, a to their output.
Note: grd2xyz already used -C[f|i] for some formatting schemes that are rarely used. I changed this to -F and made -C backwards compatible of, course.
for a random CPT that I made with makecpt -A55 to have a nonzero transparency.
PS. Joaquim and I are working some fixes to the writing of images via GDAL. The goal is to pixel-by-pixel transparency which PostScript cannot do.