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check datasource in envelope method

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This commit is contained in:
Artem Pavlenko 2005-11-30 00:24:08 +00:00
parent 7f4df91371
commit aaba4d08cf
1 changed files with 3 additions and 1 deletions
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4
src/layer.cpp
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@ -162,7 +162,9 @@ namespace mapnik
const Envelope<double>& Layer::envelope() const
{
return ds_->envelope();
if (ds_)
return ds_->envelope();
return Envelope<double>();
}
void Layer::selection_style(const std::string& name)