Support underlays in modern more #4990

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1. maxrjones

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   feature requestRequest a new featureRequest a new feature

   on Mar 18, 2021
2. PaulWessel commented on Mar 18, 2021

   

   PaulWessel

   on Mar 18, 2021

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   Some of you may recall an early modern mode command called revert (revert.c now lives in exile in the sandbox just in case). It could strip off layers from the current plot. It seems a bit clutzy to me thought.

   Here are quick thoughts on overlays/underlays

   1. Plot what you consider a layer normally
   2. Run gmt layer get name to make a named snapshot of current plot
   3. When you want to add this layer to another plot, run gmt layer put name
   4. To use it as an underlay (first layer) for a new figure, you just do gmt figure first then gmt layer put name
   5. Layers are not tied to a figure, but tied to session, and may be used any number of times
   6. Named layers die when the session ends

   The verbs get and put can be discussed. We can discuss if calling get with the same name as before simply overwrites or if we refuse to do so without some -F force option or an intermediate gmt layer delete name command.
3. maxrjones commented on Mar 19, 2021

   

   maxrjones

   on Mar 19, 2021

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   Some of you may recall an early modern mode command called revert (revert.c now lives in exile in the sandbox just in case). It could strip off layers from the current plot. It seems a bit clutzy to me thought.

   Here are quick thoughts on overlays/underlays

   1. Plot what you consider a layer normally
   
   2. Run **gmt layer get** _name_ to make a named snapshot of current plot
   
   3. When you want to add this layer to another plot, run **gmt layer put** _name_
   
   4. To use it as an underlay (first layer) for a new figure, you just do **gmt figure** first then **gmt layer put** _name_
   
   5. Layers are not tied to a figure, but tied to session, and may be used any number of times
   
   6. Named layers die when the session ends
   

   The verbs get and put can be discussed. We can discuss if calling get with the same name as before simply overwrites or if we refuse to do so without some -F force option or an intermediate gmt layer delete name command.

   Given that the layers die when the session ends, it is not clear to me how you would finalize the figures without closing the session if, for example, you want to use the same layers when updating a plot every day, week, year, etc.
4. PaulWessel commented on Mar 19, 2021

   

   PaulWessel

   on Mar 19, 2021

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   Perhaps we should convert this to a discussion item?
5. maxrjones

   closed this as completedon Mar 19, 2021
6. GenericMappingTools

   locked and limited conversation to collaborators on Mar 19, 2021