[QGIS-Developer] Convert from mapunits to pixels

[Tom Chadwin]

Because this conversion will not take place in QGIS but elsewhere, I need the
underlying maths for the conversion, not the API method. I've now found the
formula for EPSG:3857, and a method for all projections which works in
Leaflet, here:

https://stackoverflow.com/questions/27545098/leaflet-calculating-meters-per-pixel-at-zoom-level

Thanks

Tom



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