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;
}