void QgsSymbolLayer::prepareExpressions( const QgsSymbolRenderContext &context )
{
mDataDefinedProperties.prepare( context.renderContext().expressionContext() );
if ( !context.fields().isEmpty() )
{
//QgsFields is implicitly shared, so it's cheap to make a copy
mFields = context.fields();
}
}
void QgsSymbolLayer::prepareExpressions( const QgsSymbolRenderContext& context )
{
QMap< QString, QgsDataDefined* >::const_iterator it = mDataDefinedProperties.constBegin();
for ( ; it != mDataDefinedProperties.constEnd(); ++it )
{
if ( it.value() )
{
it.value()->prepareExpression( context.renderContext().expressionContext() );
}
}
if ( !context.fields().isEmpty() )
{
//QgsFields is implicitly shared, so it's cheap to make a copy
mFields = context.fields();
}
}
void QgsVectorFieldSymbolLayer::startRender( QgsSymbolRenderContext& context )
{
if ( mLineSymbol )
{
mLineSymbol->startRender( context.renderContext(), context.fields() );
}
QgsFields fields = context.fields();
if ( !fields.isEmpty() )
{
mXIndex = fields.lookupField( mXAttribute );
mYIndex = fields.lookupField( mYAttribute );
}
else
{
mXIndex = -1;
mYIndex = -1;
}
}