Author Topic: Grouping tiled layers together as a single layer (Read 2533 times)

PeterC · « **on:** 14 March 2017, 06:51:40 »

Suppose we wish to offer a layer group that comprises three tiled raster layers:

We need to:

Process each of the three tiled layers as normal, including adding a row for each to LayerDefs_Other.csv, but
- with donotshow set to TRUE so the layer will NOT be listed as itself in the drop-down
Add a new row to LayerDefs_Other.csv for the layer group with all fields as normal (or null), except for
- the layertype being Group (rather than Tile)
- the url being a list of layer titles that are to be included in the group, in the format either:
  - comma separated layer titles (eg Layer A,Layer B,Layer C), or
  - an array of quoted layer titles (eg ["Layer A","Layer B","Layer C"])
- the value of:
  - minx being null (it will be calculated as the minimum value of minx among all the layers in the group)
  - miny, maxx, maxy similarly being null, and calculated
- the folder being null

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