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Modules that should take -l for auto-legend building #1973

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@PaulWessel

Description of the desired feature

Looking at all the modules that produce plots, I think this is the list that may need -l:

  • contour: Need to resolve how/if to deal with annotated vs regular contours.
  • grdcontour: ditto
  • grdvector: Place a scaled vector in legend. Alternatively, or possible in addition, to how wiggle plots a scale bar?
  • plot/plot3d: Need to allow -l for polygon, plotting a filled/outlined rectangle.
  • velo: maybe arrow with error ellipse? Or like grdvector add option to plot a scale
  • meca: Could plot using the mega custom symbol in plot.

For contours the proposed option was -l[annotlabel]/[contourlabel] in order to allow one or both lines.
I have excluded modules like coast and wiggle since not likely to need legends (?).

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