bool QgsMeshDatasetValue::operator==( const QgsMeshDatasetValue &other ) const
{
bool equal = std::isnan( mX ) == std::isnan( other.x() );
equal &= std::isnan( mY ) == std::isnan( other.y() );
if ( equal )
{
if ( std::isnan( mY ) )
{
equal &= qgsDoubleNear( other.x(), mX, 1E-8 );
}
else
{
equal &= qgsDoubleNear( other.x(), mX, 1E-8 );
equal &= qgsDoubleNear( other.y(), mY, 1E-8 );
}
}
return equal;
}
QgsMeshDatasetValue QgsMeshLayer::datasetValue( const QgsMeshDatasetIndex &index, const QgsPointXY &point ) const
{
QgsMeshDatasetValue value;
if ( mTriangularMesh && dataProvider() && dataProvider()->isValid() && index.isValid() )
{
int faceIndex = mTriangularMesh->faceIndexForPoint( point ) ;
if ( faceIndex >= 0 )
{
int nativeFaceIndex = mTriangularMesh->trianglesToNativeFaces().at( faceIndex );
if ( dataProvider()->isFaceActive( index, nativeFaceIndex ) )
{
if ( dataProvider()->datasetGroupMetadata( index ).dataType() == QgsMeshDatasetGroupMetadata::DataOnFaces )
{
int nativeFaceIndex = mTriangularMesh->trianglesToNativeFaces().at( faceIndex );
value = dataProvider()->datasetValue( index, nativeFaceIndex );
}
else
{
const QgsMeshFace &face = mTriangularMesh->triangles()[faceIndex];
const int v1 = face[0], v2 = face[1], v3 = face[2];
const QgsPoint p1 = mTriangularMesh->vertices()[v1], p2 = mTriangularMesh->vertices()[v2], p3 = mTriangularMesh->vertices()[v3];
const QgsMeshDatasetValue val1 = dataProvider()->datasetValue( index, v1 );
const QgsMeshDatasetValue val2 = dataProvider()->datasetValue( index, v2 );
const QgsMeshDatasetValue val3 = dataProvider()->datasetValue( index, v3 );
const double x = QgsMeshLayerUtils::interpolateFromVerticesData( p1, p2, p3, val1.x(), val2.x(), val3.x(), point );
double y = std::numeric_limits<double>::quiet_NaN();
bool isVector = dataProvider()->datasetGroupMetadata( index ).isVector();
if ( isVector )
y = QgsMeshLayerUtils::interpolateFromVerticesData( p1, p2, p3, val1.y(), val2.y(), val3.y(), point );
value = QgsMeshDatasetValue( x, y );
}
}
}
}
return value;
}
