void QgsMapToolIdentify::convertMeasurement( QgsDistanceArea &calc, double &measure, QGis::UnitType &u, bool isArea )
{
// Helper for converting between meters and feet
// The parameter &u is out only...
QGis::UnitType myUnits = mCanvas->mapUnits();
if (( myUnits == QGis::Degrees || myUnits == QGis::Feet ) &&
calc.ellipsoid() != "NONE" &&
calc.hasCrsTransformEnabled() )
{
// Measuring on an ellipsoid returns meters, and so does using projections???
myUnits = QGis::Meters;
QgsDebugMsg( "We're measuring on an ellipsoid or using projections, the system is returning meters" );
}
// Get the units for display
QSettings settings;
QString myDisplayUnitsTxt = settings.value( "/qgis/measure/displayunits", "meters" ).toString();
// Only convert between meters and feet
if ( myUnits == QGis::Meters && myDisplayUnitsTxt == "feet" )
{
QgsDebugMsg( QString( "Converting %1 meters" ).arg( QString::number( measure ) ) );
measure /= 0.3048;
if ( isArea )
{
measure /= 0.3048;
}
QgsDebugMsg( QString( "to %1 feet" ).arg( QString::number( measure ) ) );
myUnits = QGis::Feet;
}
if ( myUnits == QGis::Feet && myDisplayUnitsTxt == "meters" )
{
QgsDebugMsg( QString( "Converting %1 feet" ).arg( QString::number( measure ) ) );
measure *= 0.3048;
if ( isArea )
{
measure *= 0.3048;
}
QgsDebugMsg( QString( "to %1 meters" ).arg( QString::number( measure ) ) );
myUnits = QGis::Meters;
}
u = myUnits;
}
