void QgsAtlasComposition::prepareForFeature( int featureI )
{
if ( !mCoverageLayer )
{
return;
}
if ( mFeatureIds.size() == 0 )
{
emit statusMsgChanged( tr( "No matching atlas features" ) );
return;
}
// retrieve the next feature, based on its id
mCoverageLayer->getFeatures( QgsFeatureRequest().setFilterFid( mFeatureIds[ featureI ] ) ).nextFeature( mCurrentFeature );
QgsExpression::setSpecialColumn( "$atlasfeatureid", mCurrentFeature.id() );
QgsExpression::setSpecialColumn( "$atlasgeometry", QVariant::fromValue( *mCurrentFeature.geometry() ) );
QgsExpression::setSpecialColumn( "$feature", QVariant(( int )featureI + 1 ) );
// generate filename for current feature
evalFeatureFilename();
// evaluate label expressions
QList<QgsComposerLabel*> labels;
mComposition->composerItems( labels );
for ( QList<QgsComposerLabel*>::iterator lit = labels.begin(); lit != labels.end(); ++lit )
{
( *lit )->setExpressionContext( &mCurrentFeature, mCoverageLayer );
}
// update shapes (in case they use data defined symbology with atlas properties)
QList<QgsComposerShape*> shapes;
mComposition->composerItems( shapes );
for ( QList<QgsComposerShape*>::iterator lit = shapes.begin(); lit != shapes.end(); ++lit )
{
( *lit )->update();
}
// update page background (in case it uses data defined symbology with atlas properties)
QList<QgsPaperItem*> pages;
mComposition->composerItems( pages );
for ( QList<QgsPaperItem*>::iterator pageIt = pages.begin(); pageIt != pages.end(); ++pageIt )
{
( *pageIt )->update();
}
emit statusMsgChanged( QString( tr( "Atlas feature %1 of %2" ) ).arg( featureI + 1 ).arg( mFeatureIds.size() ) );
//update composer maps
//build a list of atlas-enabled composer maps
QList<QgsComposerMap*> maps;
QList<QgsComposerMap*> atlasMaps;
mComposition->composerItems( maps );
for ( QList<QgsComposerMap*>::iterator mit = maps.begin(); mit != maps.end(); ++mit )
{
QgsComposerMap* currentMap = ( *mit );
if ( !currentMap->atlasDriven() )
{
continue;
}
atlasMaps << currentMap;
}
//clear the transformed bounds of the previous feature
mTransformedFeatureBounds = QgsRectangle();
if ( atlasMaps.isEmpty() )
{
//no atlas enabled maps
return;
}
// compute extent of current feature in the map CRS. This should be set on a per-atlas map basis,
// but given that it's not currently possible to have maps with different CRSes we can just
// calculate it once based on the first atlas maps' CRS.
computeExtent( atlasMaps[0] );
//update atlas bounds of every atlas enabled composer map
for ( QList<QgsComposerMap*>::iterator mit = atlasMaps.begin(); mit != atlasMaps.end(); ++mit )
{
prepareMap( *mit );
}
}
bool QgsAtlasComposition::prepareForFeature( const int featureI, const bool updateMaps )
{
if ( !mCoverageLayer )
{
return false;
}
if ( mFeatureIds.isEmpty() )
{
emit statusMsgChanged( tr( "No matching atlas features" ) );
return false;
}
if ( featureI >= mFeatureIds.size() )
{
return false;
}
mCurrentFeatureNo = featureI;
// retrieve the next feature, based on its id
mCoverageLayer->getFeatures( QgsFeatureRequest().setFilterFid( mFeatureIds[ featureI ].first ) ).nextFeature( mCurrentFeature );
QgsExpressionContext expressionContext = createExpressionContext();
// generate filename for current feature
if ( !evalFeatureFilename( expressionContext ) )
{
//error evaluating filename
return false;
}
mGeometryCache.clear();
emit featureChanged( &mCurrentFeature );
emit statusMsgChanged( QString( tr( "Atlas feature %1 of %2" ) ).arg( featureI + 1 ).arg( mFeatureIds.size() ) );
if ( !mCurrentFeature.isValid() )
{
//bad feature
return true;
}
if ( !updateMaps )
{
//nothing more to do
return true;
}
//update composer maps
//build a list of atlas-enabled composer maps
QList<QgsComposerMap*> maps;
QList<QgsComposerMap*> atlasMaps;
mComposition->composerItems( maps );
if ( maps.isEmpty() )
{
return true;
}
for ( QList<QgsComposerMap*>::iterator mit = maps.begin(); mit != maps.end(); ++mit )
{
QgsComposerMap* currentMap = ( *mit );
if ( !currentMap->atlasDriven() )
{
continue;
}
atlasMaps << currentMap;
}
if ( !atlasMaps.isEmpty() )
{
//clear the transformed bounds of the previous feature
mTransformedFeatureBounds = QgsRectangle();
// compute extent of current feature in the map CRS. This should be set on a per-atlas map basis,
// but given that it's not currently possible to have maps with different CRSes we can just
// calculate it once based on the first atlas maps' CRS.
computeExtent( atlasMaps[0] );
}
for ( QList<QgsComposerMap*>::iterator mit = maps.begin(); mit != maps.end(); ++mit )
{
if (( *mit )->atlasDriven() )
{
// map is atlas driven, so update it's bounds (causes a redraw)
prepareMap( *mit );
}
else
{
// map is not atlas driven, so manually force a redraw (to reflect possibly atlas
// dependent symbology)
( *mit )->cache();
}
}
return true;
}
void QgsAtlasComposition::prepareForFeature( int featureI )
{
if ( !mCoverageLayer )
{
return;
}
if ( mFeatureIds.size() == 0 )
{
emit statusMsgChanged( tr( "No matching atlas features" ) );
return;
}
// retrieve the next feature, based on its id
mCoverageLayer->getFeatures( QgsFeatureRequest().setFilterFid( mFeatureIds[ featureI ] ) ).nextFeature( mCurrentFeature );
QgsExpression::setSpecialColumn( "$atlasfeatureid", mCurrentFeature.id() );
QgsExpression::setSpecialColumn( "$atlasgeometry", QVariant::fromValue( *mCurrentFeature.geometry() ) );
QgsExpression::setSpecialColumn( "$feature", QVariant(( int )featureI + 1 ) );
// generate filename for current feature
evalFeatureFilename();
// evaluate label expressions
QList<QgsComposerLabel*> labels;
mComposition->composerItems( labels );
for ( QList<QgsComposerLabel*>::iterator lit = labels.begin(); lit != labels.end(); ++lit )
{
( *lit )->setExpressionContext( &mCurrentFeature, mCoverageLayer );
}
// update shapes (in case they use data defined symbology with atlas properties)
QList<QgsComposerShape*> shapes;
mComposition->composerItems( shapes );
for ( QList<QgsComposerShape*>::iterator lit = shapes.begin(); lit != shapes.end(); ++lit )
{
( *lit )->update();
}
// update page background (in case it uses data defined symbology with atlas properties)
QList<QgsPaperItem*> pages;
mComposition->composerItems( pages );
for ( QList<QgsPaperItem*>::iterator pageIt = pages.begin(); pageIt != pages.end(); ++pageIt )
{
( *pageIt )->update();
}
emit statusMsgChanged( QString( tr( "Atlas feature %1 of %2" ) ).arg( featureI + 1 ).arg( mFeatureIds.size() ) );
//update composer maps
//build a list of atlas-enabled composer maps
QList<QgsComposerMap*> maps;
QList<QgsComposerMap*> atlasMaps;
mComposition->composerItems( maps );
for ( QList<QgsComposerMap*>::iterator mit = maps.begin(); mit != maps.end(); ++mit )
{
QgsComposerMap* currentMap = ( *mit );
if ( !currentMap->atlasDriven() )
{
continue;
}
atlasMaps << currentMap;
}
if ( atlasMaps.isEmpty() )
{
//no atlas enabled maps
return;
}
//
// compute the new extent
// keep the original aspect ratio
// and apply a margin
const QgsCoordinateReferenceSystem& coverage_crs = mCoverageLayer->crs();
// transformation needed for feature geometries. This should be set on a per-atlas map basis,
// but given that it's not currently possible to have maps with different CRSes we can just
// calculate it once based on the first atlas maps' CRS.
const QgsCoordinateReferenceSystem& destination_crs = atlasMaps[0]->mapRenderer()->destinationCrs();
mTransform.setSourceCrs( coverage_crs );
mTransform.setDestCRS( destination_crs );
// QgsGeometry::boundingBox is expressed in the geometry"s native CRS
// We have to transform the grometry to the destination CRS and ask for the bounding box
// Note: we cannot directly take the transformation of the bounding box, since transformations are not linear
QgsGeometry tgeom( *mCurrentFeature.geometry() );
tgeom.transform( mTransform );
mTransformedFeatureBounds = tgeom.boundingBox();
//update atlas bounds of every atlas enabled composer map
for ( QList<QgsComposerMap*>::iterator mit = atlasMaps.begin(); mit != atlasMaps.end(); ++mit )
{
prepareMap( *mit );
}
}
void QgsAtlasComposition::prepareForFeature( int featureI )
{
if ( !mComposerMap || !mCoverageLayer )
{
return;
}
if ( mFeatureIds.size() == 0 )
{
emit statusMsgChanged( tr( "No matching atlas features" ) );
return;
}
// retrieve the next feature, based on its id
mCoverageLayer->getFeatures( QgsFeatureRequest().setFilterFid( mFeatureIds[ featureI ] ) ).nextFeature( mCurrentFeature );
QgsExpression::setSpecialColumn( "$atlasfeatureid", mCurrentFeature.id() );
QgsExpression::setSpecialColumn( "$atlasgeometry", QVariant::fromValue( *mCurrentFeature.geometry() ) );
QgsExpression::setSpecialColumn( "$feature", QVariant(( int )featureI + 1 ) );
// generate filename for current feature
evalFeatureFilename();
//
// compute the new extent
// keep the original aspect ratio
// and apply a margin
// QgsGeometry::boundingBox is expressed in the geometry"s native CRS
// We have to transform the grometry to the destination CRS and ask for the bounding box
// Note: we cannot directly take the transformation of the bounding box, since transformations are not linear
QgsGeometry tgeom( *mCurrentFeature.geometry() );
tgeom.transform( mTransform );
QgsRectangle geom_rect = tgeom.boundingBox();
double xa1 = geom_rect.xMinimum();
double xa2 = geom_rect.xMaximum();
double ya1 = geom_rect.yMinimum();
double ya2 = geom_rect.yMaximum();
QgsRectangle new_extent = geom_rect;
QgsRectangle mOrigExtent = mComposerMap->extent();
if ( mFixedScale )
{
// only translate, keep the original scale (i.e. width x height)
double geom_center_x = ( xa1 + xa2 ) / 2.0;
double geom_center_y = ( ya1 + ya2 ) / 2.0;
double xx = geom_center_x - mOrigExtent.width() / 2.0;
double yy = geom_center_y - mOrigExtent.height() / 2.0;
new_extent = QgsRectangle( xx,
yy,
xx + mOrigExtent.width(),
yy + mOrigExtent.height() );
}
else
{
// auto scale
double geom_ratio = geom_rect.width() / geom_rect.height();
double map_ratio = mOrigExtent.width() / mOrigExtent.height();
// geometry height is too big
if ( geom_ratio < map_ratio )
{
// extent the bbox's width
double adj_width = ( map_ratio * geom_rect.height() - geom_rect.width() ) / 2.0;
xa1 -= adj_width;
xa2 += adj_width;
}
// geometry width is too big
else if ( geom_ratio > map_ratio )
{
// extent the bbox's height
double adj_height = ( geom_rect.width() / map_ratio - geom_rect.height() ) / 2.0;
ya1 -= adj_height;
ya2 += adj_height;
}
new_extent = QgsRectangle( xa1, ya1, xa2, ya2 );
if ( mMargin > 0.0 )
{
new_extent.scale( 1 + mMargin );
}
}
// evaluate label expressions
QList<QgsComposerLabel*> labels;
mComposition->composerItems( labels );
for ( QList<QgsComposerLabel*>::iterator lit = labels.begin(); lit != labels.end(); ++lit )
{
( *lit )->setExpressionContext( &mCurrentFeature, mCoverageLayer );
}
// set the new extent (and render)
mComposerMap->setNewAtlasFeatureExtent( new_extent );
emit statusMsgChanged( QString( tr( "Atlas feature %1 of %2" ) ).arg( featureI + 1 ).arg( mFeatureIds.size() ) );
}
bool QgsAtlasComposition::prepareForFeature( int featureI )
{
if ( !mCoverageLayer )
{
return false;
}
if ( mFeatureIds.size() == 0 )
{
emit statusMsgChanged( tr( "No matching atlas features" ) );
return false;
}
mCurrentFeatureNo = featureI;
// retrieve the next feature, based on its id
mCoverageLayer->getFeatures( QgsFeatureRequest().setFilterFid( mFeatureIds[ featureI ] ) ).nextFeature( mCurrentFeature );
QgsExpression::setSpecialColumn( "$atlasfeatureid", mCurrentFeature.id() );
QgsExpression::setSpecialColumn( "$atlasgeometry", QVariant::fromValue( *mCurrentFeature.geometry() ) );
QgsExpression::setSpecialColumn( "$atlasfeature", QVariant::fromValue( mCurrentFeature ) );
QgsExpression::setSpecialColumn( "$feature", QVariant(( int )featureI + 1 ) );
// generate filename for current feature
if ( !evalFeatureFilename() )
{
//error evaluating filename
return false;
}
emit featureChanged( &mCurrentFeature );
emit statusMsgChanged( QString( tr( "Atlas feature %1 of %2" ) ).arg( featureI + 1 ).arg( mFeatureIds.size() ) );
//update composer maps
//build a list of atlas-enabled composer maps
QList<QgsComposerMap*> maps;
QList<QgsComposerMap*> atlasMaps;
mComposition->composerItems( maps );
for ( QList<QgsComposerMap*>::iterator mit = maps.begin(); mit != maps.end(); ++mit )
{
QgsComposerMap* currentMap = ( *mit );
if ( !currentMap->atlasDriven() )
{
continue;
}
atlasMaps << currentMap;
}
//clear the transformed bounds of the previous feature
mTransformedFeatureBounds = QgsRectangle();
if ( atlasMaps.isEmpty() )
{
//no atlas enabled maps
return true;
}
// compute extent of current feature in the map CRS. This should be set on a per-atlas map basis,
// but given that it's not currently possible to have maps with different CRSes we can just
// calculate it once based on the first atlas maps' CRS.
computeExtent( atlasMaps[0] );
//update atlas bounds of every atlas enabled composer map
for ( QList<QgsComposerMap*>::iterator mit = atlasMaps.begin(); mit != atlasMaps.end(); ++mit )
{
prepareMap( *mit );
}
return true;
}
