Conditional rendering on vector layer intersection #59
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cf #56 |
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Is there anything that you would like to me to do to get this up to a point where it can be merged? |
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This PR adds support for the specification of a vector layer in the "Extents" section of the dialogue. If this option is selected, only tiles that intersect this layer's features (not just the feature extents) are rendered. All other possible tiles are ignored. I use a
QgsSpatialIndexto check the intersection betweentile.toRectangle()geometry and features in the specified layer, so it is very fast (tested against a 400MB global coastline Esri Shapefile, and again as a PostGIS layer).An example of the benefit: I used a layer containing only the Australian mainland as my vector intersection source layer. From zooms 0 to 4, only 9 tiles are produced to cover the region of interest, compared to 301 tiles without this additional option.
Let me know if something is not up to scratch.