double Heatmap::mapUnitsOf( double meters, QgsCoordinateReferenceSystem layerCrs ) { // Worker to transform metres input to mapunits QgsDistanceArea da; da.setSourceCrs( layerCrs.srsid() ); da.setEllipsoid( layerCrs.ellipsoidAcronym() ); if ( da.geographic() ) { da.setEllipsoidalMode( true ); } return meters / da.measureLine( QgsPoint( 0.0, 0.0 ), QgsPoint( 0.0, 1.0 ) ); }
double HeatmapGui::mapUnitsOf( double dist, const QgsCoordinateReferenceSystem& layerCrs ) const { // converter function to transform layer input to mapunits // so that bounding box can be updated QgsDistanceArea da; da.setSourceCrs( layerCrs.srsid() ); da.setEllipsoid( layerCrs.ellipsoidAcronym() ); if ( da.geographic() ) { da.setEllipsoidalMode( true ); } double unitDistance = da.measureLine( QgsPoint( 0.0, 0.0 ), QgsPoint( 0.0, 1.0 ) ); QgsDebugMsg( QString( "Converted %1 layer to %2 map units" ).arg( dist ).arg( dist / unitDistance ) ); return dist / unitDistance; }