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[composer] Use largest map in composition as reference map if no

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reference map is explicitly set
This commit is contained in:
Nyall Dawson 2017-01-16 09:25:47 +10:00
parent e0934d7766
commit f32d11b508
3 changed files with 53 additions and 2 deletions
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19
src/core/composer/qgscomposition.cpp
View File

@ -791,7 +791,24 @@ void QgsComposition::setPrintResolution( const int dpi )
QgsComposerMap* QgsComposition::referenceMap() const
{
return dynamic_cast< QgsComposerMap* >( const_cast< QgsComposerItem* >( getComposerItemByUuid( mWorldFileMapId ) ) );
// prefer explicitly set reference map
if ( QgsComposerMap* map = dynamic_cast< QgsComposerMap* >( const_cast< QgsComposerItem* >( getComposerItemByUuid( mWorldFileMapId ) ) ) )
return map;
// else try to find largest map
QList< const QgsComposerMap* > maps = composerMapItems();
const QgsComposerMap* largestMap = nullptr;
double largestMapArea = 0;
Q_FOREACH ( const QgsComposerMap* map, maps )
{
double area = map->rect().width() * map->rect().height();
if ( area > largestMapArea )
{
largestMapArea = area;
largestMap = map;
}
}
return const_cast< QgsComposerMap* >( largestMap );
}
void QgsComposition::setReferenceMap( QgsComposerMap* map )

3
src/core/composer/qgscomposition.h
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@ -424,7 +424,8 @@ class CORE_EXPORT QgsComposition : public QGraphicsScene, public QgsExpressionCo
void setGenerateWorldFile( bool enabled ) { mGenerateWorldFile = enabled; }
/** Returns the map item which will be used to generate corresponding world files when the
* composition is exported, or nullptr if no corresponding map is set.
* composition is exported. If no map was explicitly set via setReferenceMap(), the largest
* map in the composition will be returned (or nullptr if there are no maps in the composition).
* @see setReferenceMap()
* @see generateWorldFile()
*/

33
tests/src/core/testqgscomposition.cpp
View File

@ -57,6 +57,7 @@ class TestQgsComposition : public QObject
void georeference();
void variablesEdited();
void itemVariablesFunction();
void referenceMap();
private:
QgsComposition *mComposition;
@ -639,5 +640,37 @@ void TestQgsComposition::itemVariablesFunction()
delete composition;
}
void TestQgsComposition::referenceMap()
{
QgsRectangle extent( 2000, 2800, 2500, 2900 );
QgsMapSettings ms;
ms.setExtent( extent );
QgsComposition* composition = new QgsComposition( ms, QgsProject::instance() );
// no maps
QVERIFY( !composition->referenceMap() );
QgsComposerMap* map = new QgsComposerMap( composition );
map->setNewExtent( extent );
map->setSceneRect( QRectF( 30, 60, 200, 100 ) );
composition->addComposerMap( map );
QCOMPARE( composition->referenceMap(), map );
// add a larger map
QgsComposerMap* map2 = new QgsComposerMap( composition );
map2->setNewExtent( extent );
map2->setSceneRect( QRectF( 30, 60, 250, 150 ) );
composition->addComposerMap( map2 );
QCOMPARE( composition->referenceMap(), map2 );
// explicitly set reference map
composition->setReferenceMap( map );
QCOMPARE( composition->referenceMap(), map );
delete composition;
}
QGSTEST_MAIN( TestQgsComposition )
#include "testqgscomposition.moc"