QgsCompoundCurve *QgsCompoundCurve::curveSubstring( double startDistance, double endDistance ) const
{
if ( startDistance < 0 && endDistance < 0 )
return createEmptyWithSameType();
endDistance = std::max( startDistance, endDistance );
std::unique_ptr< QgsCompoundCurve > substring = qgis::make_unique< QgsCompoundCurve >();
double distanceTraversed = 0;
for ( const QgsCurve *curve : mCurves )
{
const double thisCurveLength = curve->length();
if ( distanceTraversed + thisCurveLength < startDistance )
{
// keep going - haven't found start yet, so no need to include this curve at all
}
else
{
std::unique_ptr< QgsCurve > part( curve->curveSubstring( startDistance - distanceTraversed, endDistance - distanceTraversed ) );
if ( part )
substring->addCurve( part.release() );
}
distanceTraversed += thisCurveLength;
if ( distanceTraversed > endDistance )
break;
}
return substring.release();
}
QgsCurvePolygon *QgsCurvePolygon::snappedToGrid( double hSpacing, double vSpacing, double dSpacing, double mSpacing ) const
{
if ( !mExteriorRing )
return nullptr;
std::unique_ptr< QgsCurvePolygon > polygon( createEmptyWithSameType() );
// exterior ring
auto exterior = std::unique_ptr<QgsCurve> { static_cast< QgsCurve *>( mExteriorRing->snappedToGrid( hSpacing, vSpacing, dSpacing, mSpacing ) ) };
if ( !exterior )
return nullptr;
polygon->mExteriorRing = std::move( exterior );
//interior rings
for ( auto interior : mInteriorRings )
{
if ( !interior )
continue;
QgsCurve *gridifiedInterior = static_cast< QgsCurve * >( interior->snappedToGrid( hSpacing, vSpacing, dSpacing, mSpacing ) );
if ( !gridifiedInterior )
continue;
polygon->mInteriorRings.append( gridifiedInterior );
}
return polygon.release();
}
QgsLineString *QgsLineString::snappedToGrid( double hSpacing, double vSpacing, double dSpacing, double mSpacing ) const
{
// prepare result
std::unique_ptr<QgsLineString> result { createEmptyWithSameType() };
bool res = snapToGridPrivate( hSpacing, vSpacing, dSpacing, mSpacing, mX, mY, mZ, mM,
result->mX, result->mY, result->mZ, result->mM );
if ( res )
return result.release();
else
return nullptr;
}
QgsGeometryCollection *QgsGeometryCollection::snappedToGrid( double hSpacing, double vSpacing, double dSpacing, double mSpacing ) const
{
std::unique_ptr<QgsGeometryCollection> result;
for ( auto geom : mGeometries )
{
std::unique_ptr<QgsAbstractGeometry> gridified { geom->snappedToGrid( hSpacing, vSpacing, dSpacing, mSpacing ) };
if ( gridified )
{
if ( !result )
result = std::unique_ptr<QgsGeometryCollection> { createEmptyWithSameType() };
result->mGeometries.append( gridified.release() );
}
}
return result.release();
}
QgsCompoundCurve *QgsCompoundCurve::snappedToGrid( double hSpacing, double vSpacing, double dSpacing, double mSpacing ) const
{
std::unique_ptr<QgsCompoundCurve> result( createEmptyWithSameType() );
for ( QgsCurve *curve : mCurves )
{
std::unique_ptr<QgsCurve> gridified( static_cast< QgsCurve * >( curve->snappedToGrid( hSpacing, vSpacing, dSpacing, mSpacing ) ) );
if ( gridified )
{
result->mCurves.append( gridified.release() );
}
}
if ( result->mCurves.empty() )
return nullptr;
else
return result.release();
}
