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qgsmapcanvas.cpp
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qgsmapcanvas.cpp
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/***************************************************************************
qgsmapcanvas.cpp - description
-------------------
begin : Sun Jun 30 2002
copyright : (C) 2002 by Gary E.Sherman
email : sherman at mrcc.com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include <QtGlobal>
#include <QApplication>
#include <QCursor>
#include <QDir>
#include <QFile>
#include <QGraphicsItem>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QKeyEvent>
#include <QMouseEvent>
#include <QPainter>
#include <QPaintEvent>
#include <QPixmap>
#include <QRect>
#include <QTextStream>
#include <QResizeEvent>
#include <QString>
#include <QStringList>
#include <QWheelEvent>
#include "qgis.h"
#include "qgssettings.h"
#include "qgsmapcanvasannotationitem.h"
#include "qgsapplication.h"
#include "qgscsexception.h"
#include "qgsdatumtransformdialog.h"
#include "qgsfeatureiterator.h"
#include "qgslogger.h"
#include "qgsmapcanvas.h"
#include "qgsmapcanvasmap.h"
#include "qgsmapcanvassnappingutils.h"
#include "qgsmaplayer.h"
#include "qgsmaptoolpan.h"
#include "qgsmaptoolzoom.h"
#include "qgsmaptopixel.h"
#include "qgsmapoverviewcanvas.h"
#include "qgsmaprenderercache.h"
#include "qgsmaprenderercustompainterjob.h"
#include "qgsmaprendererparalleljob.h"
#include "qgsmaprenderersequentialjob.h"
#include "qgsmessagelog.h"
#include "qgsmessageviewer.h"
#include "qgspallabeling.h"
#include "qgsproject.h"
#include "qgsrubberband.h"
#include "qgsvectorlayer.h"
#include "qgscursors.h"
#include "qgsmapthemecollection.h"
#include <cmath>
/** \ingroup gui
* Deprecated to be deleted, stuff from here should be moved elsewhere.
* @note not available in Python bindings
*/
//TODO QGIS 3.0 - remove
class QgsMapCanvas::CanvasProperties
{
public:
CanvasProperties()
: mouseButtonDown( false )
, panSelectorDown( false )
{ }
//!Flag to indicate status of mouse button
bool mouseButtonDown;
//! Last seen point of the mouse
QPoint mouseLastXY;
//! Beginning point of a rubber band
QPoint rubberStartPoint;
//! Flag to indicate the pan selector key is held down by user
bool panSelectorDown;
};
QgsMapCanvas::QgsMapCanvas( QWidget *parent )
: QGraphicsView( parent )
, mCanvasProperties( new CanvasProperties )
, mMap( nullptr )
, mFrozen( false )
, mRefreshScheduled( false )
, mRenderFlag( true ) // by default, the canvas is rendered
, mCurrentLayer( nullptr )
, mScene( nullptr )
, mMapTool( nullptr )
, mLastNonZoomMapTool( nullptr )
, mLastExtentIndex( -1 )
, mWheelZoomFactor( 2.0 )
, mJob( nullptr )
, mJobCanceled( false )
, mLabelingResults( nullptr )
, mUseParallelRendering( false )
, mDrawRenderingStats( false )
, mCache( nullptr )
, mResizeTimer( nullptr )
, mPreviewEffect( nullptr )
, mSnappingUtils( nullptr )
, mScaleLocked( false )
, mExpressionContextScope( tr( "Map Canvas" ) )
, mZoomDragging( false )
{
mScene = new QGraphicsScene();
setScene( mScene );
setHorizontalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
setVerticalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
setMouseTracking( true );
setFocusPolicy( Qt::StrongFocus );
mResizeTimer = new QTimer( this );
mResizeTimer->setSingleShot( true );
connect( mResizeTimer, &QTimer::timeout, this, &QgsMapCanvas::refresh );
// create map canvas item which will show the map
mMap = new QgsMapCanvasMap( this );
// project handling
connect( QgsProject::instance(), &QgsProject::readProject,
this, &QgsMapCanvas::readProject );
connect( QgsProject::instance(), &QgsProject::writeProject,
this, &QgsMapCanvas::writeProject );
connect( QgsProject::instance()->mapThemeCollection(), &QgsMapThemeCollection::mapThemeChanged, this, &QgsMapCanvas::mapThemeChanged );
connect( QgsProject::instance()->mapThemeCollection(), &QgsMapThemeCollection::mapThemesChanged, this, &QgsMapCanvas::projectThemesChanged );
mSettings.setFlag( QgsMapSettings::DrawEditingInfo );
mSettings.setFlag( QgsMapSettings::UseRenderingOptimization );
mSettings.setFlag( QgsMapSettings::RenderPartialOutput );
//segmentation parameters
QgsSettings settings;
double segmentationTolerance = settings.value( QStringLiteral( "qgis/segmentationTolerance" ), "0.01745" ).toDouble();
QgsAbstractGeometry::SegmentationToleranceType toleranceType = QgsAbstractGeometry::SegmentationToleranceType( settings.value( QStringLiteral( "qgis/segmentationToleranceType" ), 0 ).toInt() );
mSettings.setSegmentationTolerance( segmentationTolerance );
mSettings.setSegmentationToleranceType( toleranceType );
mWheelZoomFactor = settings.value( QStringLiteral( "qgis/zoom_factor" ), 2 ).toDouble();
QSize s = viewport()->size();
mSettings.setOutputSize( s );
setSceneRect( 0, 0, s.width(), s.height() );
mScene->setSceneRect( QRectF( 0, 0, s.width(), s.height() ) );
moveCanvasContents( true );
connect( &mMapUpdateTimer, SIGNAL( timeout() ), SLOT( mapUpdateTimeout() ) );
mMapUpdateTimer.setInterval( 250 );
#ifdef Q_OS_WIN
// Enable touch event on Windows.
// Qt on Windows needs to be told it can take touch events or else it ignores them.
grabGesture( Qt::PinchGesture );
viewport()->setAttribute( Qt::WA_AcceptTouchEvents );
#endif
mPreviewEffect = new QgsPreviewEffect( this );
viewport()->setGraphicsEffect( mPreviewEffect );
QPixmap zoomPixmap = QPixmap( ( const char ** )( zoom_in ) );
mZoomCursor = QCursor( zoomPixmap, 7, 7 );
connect( &mAutoRefreshTimer, &QTimer::timeout, this, &QgsMapCanvas::autoRefreshTriggered );
setInteractive( false );
refresh();
} // QgsMapCanvas ctor
QgsMapCanvas::~QgsMapCanvas()
{
if ( mMapTool )
{
mMapTool->deactivate();
mMapTool = nullptr;
}
mLastNonZoomMapTool = nullptr;
// delete canvas items prior to deleting the canvas
// because they might try to update canvas when it's
// already being destructed, ends with segfault
QList<QGraphicsItem *> list = mScene->items();
QList<QGraphicsItem *>::iterator it = list.begin();
while ( it != list.end() )
{
QGraphicsItem *item = *it;
delete item;
++it;
}
mScene->deleteLater(); // crashes in python tests on windows
// mCanvasProperties auto-deleted via QScopedPointer
// CanvasProperties struct has its own dtor for freeing resources
if ( mJob )
{
whileBlocking( mJob )->cancel();
delete mJob;
}
delete mCache;
delete mLabelingResults;
} // dtor
void QgsMapCanvas::setMagnificationFactor( double factor )
{
// do not go higher or lower than min max magnification ratio
double magnifierMin = QgisGui::CANVAS_MAGNIFICATION_MIN;
double magnifierMax = QgisGui::CANVAS_MAGNIFICATION_MAX;
factor = qBound( magnifierMin, factor, magnifierMax );
// the magnifier widget is in integer percent
if ( !qgsDoubleNear( factor, mSettings.magnificationFactor(), 0.01 ) )
{
mSettings.setMagnificationFactor( factor );
refresh();
emit magnificationChanged( factor );
}
}
double QgsMapCanvas::magnificationFactor() const
{
return mSettings.magnificationFactor();
}
void QgsMapCanvas::enableAntiAliasing( bool flag )
{
mSettings.setFlag( QgsMapSettings::Antialiasing, flag );
} // anti aliasing
void QgsMapCanvas::enableMapTileRendering( bool flag )
{
mSettings.setFlag( QgsMapSettings::RenderMapTile, flag );
}
QgsMapLayer *QgsMapCanvas::layer( int index )
{
QList<QgsMapLayer *> layers = mapSettings().layers();
if ( index >= 0 && index < ( int ) layers.size() )
return layers[index];
else
return nullptr;
}
void QgsMapCanvas::setCurrentLayer( QgsMapLayer *layer )
{
mCurrentLayer = layer;
emit currentLayerChanged( layer );
}
double QgsMapCanvas::scale()
{
return mapSettings().scale();
} // scale
bool QgsMapCanvas::isDrawing()
{
return nullptr != mJob;
} // isDrawing
// return the current coordinate transform based on the extents and
// device size
const QgsMapToPixel *QgsMapCanvas::getCoordinateTransform()
{
return &mapSettings().mapToPixel();
}
void QgsMapCanvas::setLayers( const QList<QgsMapLayer *> &layers )
{
// following a theme => request denied!
if ( !mTheme.isEmpty() )
return;
setLayersPrivate( layers );
}
void QgsMapCanvas::setLayersPrivate( const QList<QgsMapLayer *> &layers )
{
QList<QgsMapLayer *> oldLayers = mSettings.layers();
// update only if needed
if ( layers == oldLayers )
return;
Q_FOREACH ( QgsMapLayer *layer, oldLayers )
{
disconnect( layer, &QgsMapLayer::repaintRequested, this, &QgsMapCanvas::layerRepaintRequested );
disconnect( layer, &QgsMapLayer::crsChanged, this, &QgsMapCanvas::layerCrsChange );
disconnect( layer, &QgsMapLayer::autoRefreshIntervalChanged, this, &QgsMapCanvas::updateAutoRefreshTimer );
if ( QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( layer ) )
{
disconnect( vlayer, &QgsVectorLayer::selectionChanged, this, &QgsMapCanvas::selectionChangedSlot );
}
}
mSettings.setLayers( layers );
Q_FOREACH ( QgsMapLayer *layer, layers )
{
if ( !layer )
continue;
connect( layer, &QgsMapLayer::repaintRequested, this, &QgsMapCanvas::layerRepaintRequested );
connect( layer, &QgsMapLayer::crsChanged, this, &QgsMapCanvas::layerCrsChange );
connect( layer, &QgsMapLayer::autoRefreshIntervalChanged, this, &QgsMapCanvas::updateAutoRefreshTimer );
if ( QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( layer ) )
{
connect( vlayer, &QgsVectorLayer::selectionChanged, this, &QgsMapCanvas::selectionChangedSlot );
}
}
updateDatumTransformEntries();
QgsDebugMsg( "Layers have changed, refreshing" );
emit layersChanged();
updateAutoRefreshTimer();
refresh();
}
const QgsMapSettings &QgsMapCanvas::mapSettings() const
{
return mSettings;
}
void QgsMapCanvas::setDestinationCrs( const QgsCoordinateReferenceSystem &crs )
{
if ( mSettings.destinationCrs() == crs )
return;
// try to reproject current extent to the new one
QgsRectangle rect;
if ( !mSettings.visibleExtent().isEmpty() )
{
QgsCoordinateTransform transform( mSettings.destinationCrs(), crs );
try
{
rect = transform.transformBoundingBox( mSettings.visibleExtent() );
}
catch ( QgsCsException &e )
{
Q_UNUSED( e );
QgsDebugMsg( QString( "Transform error caught: %1" ).arg( e.what() ) );
}
}
if ( !rect.isEmpty() )
{
setExtent( rect );
}
mSettings.setDestinationCrs( crs );
updateScale();
QgsDebugMsg( "refreshing after destination CRS changed" );
refresh();
updateDatumTransformEntries();
emit destinationCrsChanged();
}
const QgsLabelingResults *QgsMapCanvas::labelingResults() const
{
return mLabelingResults;
}
void QgsMapCanvas::setCachingEnabled( bool enabled )
{
if ( enabled == isCachingEnabled() )
return;
if ( mJob && mJob->isActive() )
{
// wait for the current rendering to finish, before touching the cache
mJob->waitForFinished();
}
if ( enabled )
{
mCache = new QgsMapRendererCache;
}
else
{
delete mCache;
mCache = nullptr;
}
}
bool QgsMapCanvas::isCachingEnabled() const
{
return nullptr != mCache;
}
void QgsMapCanvas::clearCache()
{
if ( mCache )
mCache->clear();
}
void QgsMapCanvas::setParallelRenderingEnabled( bool enabled )
{
mUseParallelRendering = enabled;
}
bool QgsMapCanvas::isParallelRenderingEnabled() const
{
return mUseParallelRendering;
}
void QgsMapCanvas::setMapUpdateInterval( int timeMilliseconds )
{
mMapUpdateTimer.setInterval( timeMilliseconds );
}
int QgsMapCanvas::mapUpdateInterval() const
{
return mMapUpdateTimer.interval();
}
QgsMapLayer *QgsMapCanvas::currentLayer()
{
return mCurrentLayer;
}
void QgsMapCanvas::refresh()
{
if ( !mSettings.hasValidSettings() )
{
QgsDebugMsg( "CANVAS refresh - invalid settings -> nothing to do" );
return;
}
if ( !mRenderFlag || mFrozen )
{
QgsDebugMsg( "CANVAS render flag off" );
return;
}
if ( mRefreshScheduled )
{
QgsDebugMsg( "CANVAS refresh already scheduled" );
return;
}
mRefreshScheduled = true;
QgsDebugMsg( "CANVAS refresh scheduling" );
// schedule a refresh
QTimer::singleShot( 1, this, SLOT( refreshMap() ) );
} // refresh
void QgsMapCanvas::refreshMap()
{
Q_ASSERT( mRefreshScheduled );
QgsDebugMsgLevel( "CANVAS refresh!", 3 );
stopRendering(); // if any...
//build the expression context
QgsExpressionContext expressionContext;
expressionContext << QgsExpressionContextUtils::globalScope()
<< QgsExpressionContextUtils::projectScope( QgsProject::instance() )
<< QgsExpressionContextUtils::mapSettingsScope( mSettings )
<< new QgsExpressionContextScope( mExpressionContextScope );
mSettings.setExpressionContext( expressionContext );
if ( !mTheme.isEmpty() )
{
// IMPORTANT: we MUST set the layer style overrides here! (At the time of writing this
// comment) retrieving layer styles from the theme collection gives an XML snapshot of the
// current state of the style. If we had stored the style overrides earlier (such as in
// mapThemeChanged slot) then this xml could be out of date...
// TODO: if in future QgsMapThemeCollection::mapThemeStyleOverrides is changed to
// just return the style name, we can instead set the overrides in mapThemeChanged and not here
mSettings.setLayerStyleOverrides( QgsProject::instance()->mapThemeCollection()->mapThemeStyleOverrides( mTheme ) );
}
// create the renderer job
Q_ASSERT( !mJob );
mJobCanceled = false;
if ( mUseParallelRendering )
mJob = new QgsMapRendererParallelJob( mSettings );
else
mJob = new QgsMapRendererSequentialJob( mSettings );
connect( mJob, &QgsMapRendererJob::finished, this, &QgsMapCanvas::rendererJobFinished );
mJob->setCache( mCache );
QStringList layersForGeometryCache;
Q_FOREACH ( QgsMapLayer *layer, mSettings.layers() )
{
if ( QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( layer ) )
{
if ( vl->isEditable() )
layersForGeometryCache << vl->id();
}
}
mJob->setRequestedGeometryCacheForLayers( layersForGeometryCache );
mJob->start();
// from now on we can accept refresh requests again
// this must be reset only after the job has been started, because
// some providers (yes, it's you WCS and AMS!) during preparation
// do network requests and start an internal event loop, which may
// end up calling refresh() and would schedule another refresh,
// deleting the one we have just started.
mRefreshScheduled = false;
mMapUpdateTimer.start();
emit renderStarting();
}
void QgsMapCanvas::mapThemeChanged( const QString &theme )
{
if ( theme == mTheme )
{
// set the canvas layers to match the new layers contained in the map theme
// NOTE: we do this when the theme layers change and not when we are refreshing the map
// as setLayers() sets up necessary connections to handle changes to the layers
setLayersPrivate( QgsProject::instance()->mapThemeCollection()->mapThemeVisibleLayers( mTheme ) );
// IMPORTANT: we don't set the layer style overrides here! (At the time of writing this
// comment) retrieving layer styles from the theme collection gives an XML snapshot of the
// current state of the style. If changes were made to the style then this xml
// snapshot goes out of sync...
// TODO: if in future QgsMapThemeCollection::mapThemeStyleOverrides is changed to
// just return the style name, we can instead set the overrides here and not in refreshMap()
clearCache();
refresh();
}
}
void QgsMapCanvas::rendererJobFinished()
{
QgsDebugMsg( QString( "CANVAS finish! %1" ).arg( !mJobCanceled ) );
mMapUpdateTimer.stop();
// TODO: would be better to show the errors in message bar
Q_FOREACH ( const QgsMapRendererJob::Error &error, mJob->errors() )
{
QgsMessageLog::logMessage( error.layerID + " :: " + error.message, tr( "Rendering" ) );
}
if ( !mJobCanceled )
{
// take labeling results before emitting renderComplete, so labeling map tools
// connected to signal work with correct results
if ( !mJob->usedCachedLabels() )
{
delete mLabelingResults;
mLabelingResults = mJob->takeLabelingResults();
}
QImage img = mJob->renderedImage();
// emit renderComplete to get our decorations drawn
QPainter p( &img );
emit renderComplete( &p );
QgsSettings settings;
if ( settings.value( QStringLiteral( "Map/logCanvasRefreshEvent" ), false ).toBool() )
{
QString logMsg = tr( "Canvas refresh: %1 ms" ).arg( mJob->renderingTime() );
QgsMessageLog::logMessage( logMsg, tr( "Rendering" ) );
}
if ( mDrawRenderingStats )
{
int w = img.width(), h = img.height();
QFont fnt = p.font();
fnt.setBold( true );
p.setFont( fnt );
int lh = p.fontMetrics().height() * 2;
QRect r( 0, h - lh, w, lh );
p.setPen( Qt::NoPen );
p.setBrush( QColor( 0, 0, 0, 110 ) );
p.drawRect( r );
p.setPen( Qt::white );
QString msg = QStringLiteral( "%1 :: %2 ms" ).arg( mUseParallelRendering ? "PARALLEL" : "SEQUENTIAL" ).arg( mJob->renderingTime() );
p.drawText( r, msg, QTextOption( Qt::AlignCenter ) );
}
p.end();
mMap->setContent( img, imageRect( img, mSettings ) );
}
// now we are in a slot called from mJob - do not delete it immediately
// so the class is still valid when the execution returns to the class
mJob->deleteLater();
mJob = nullptr;
emit mapCanvasRefreshed();
}
QgsRectangle QgsMapCanvas::imageRect( const QImage &img, const QgsMapSettings &mapSettings )
{
// This is a hack to pass QgsMapCanvasItem::setRect what it
// expects (encoding of position and size of the item)
const QgsMapToPixel &m2p = mapSettings.mapToPixel();
QgsPoint topLeft = m2p.toMapPoint( 0, 0 );
double res = m2p.mapUnitsPerPixel();
QgsRectangle rect( topLeft.x(), topLeft.y(), topLeft.x() + img.width()*res, topLeft.y() - img.height()*res );
return rect;
}
void QgsMapCanvas::mapUpdateTimeout()
{
if ( mJob )
{
const QImage &img = mJob->renderedImage();
mMap->setContent( img, imageRect( img, mSettings ) );
}
}
void QgsMapCanvas::stopRendering()
{
if ( mJob )
{
QgsDebugMsg( "CANVAS stop rendering!" );
mJobCanceled = true;
disconnect( mJob, &QgsMapRendererJob::finished, this, &QgsMapCanvas::rendererJobFinished );
connect( mJob, &QgsMapRendererQImageJob::finished, mJob, &QgsMapRendererQImageJob::deleteLater );
mJob->cancelWithoutBlocking();
mJob = nullptr;
}
}
//the format defaults to "PNG" if not specified
void QgsMapCanvas::saveAsImage( const QString &fileName, QPixmap *theQPixmap, const QString &format )
{
QPainter painter;
QImage image;
//
//check if the optional QPaintDevice was supplied
//
if ( theQPixmap )
{
image = theQPixmap->toImage();
painter.begin( &image );
// render
QgsMapRendererCustomPainterJob job( mSettings, &painter );
job.start();
job.waitForFinished();
emit renderComplete( &painter );
}
else //use the map view
{
image = mMap->contentImage().copy();
painter.begin( &image );
}
// draw annotations
QStyleOptionGraphicsItem option;
option.initFrom( this );
QGraphicsItem *item = nullptr;
QListIterator<QGraphicsItem *> i( items() );
i.toBack();
while ( i.hasPrevious() )
{
item = i.previous();
if ( !item || dynamic_cast< QgsMapCanvasAnnotationItem * >( item ) )
{
continue;
}
painter.save();
QPointF itemScenePos = item->scenePos();
painter.translate( itemScenePos.x(), itemScenePos.y() );
item->paint( &painter, &option );
painter.restore();
}
painter.end();
image.save( fileName, format.toLocal8Bit().data() );
//create a world file to go with the image...
QgsRectangle myRect = mapSettings().visibleExtent();
QString myHeader;
// note: use 17 places of precision for all numbers output
//Pixel XDim
myHeader += qgsDoubleToString( mapUnitsPerPixel() ) + "\r\n";
//Rotation on y axis - hard coded
myHeader += QLatin1String( "0 \r\n" );
//Rotation on x axis - hard coded
myHeader += QLatin1String( "0 \r\n" );
//Pixel YDim - almost always negative - see
//http://en.wikipedia.org/wiki/World_file#cite_note-2
myHeader += '-' + qgsDoubleToString( mapUnitsPerPixel() ) + "\r\n";
//Origin X (center of top left cell)
myHeader += qgsDoubleToString( myRect.xMinimum() + ( mapUnitsPerPixel() / 2 ) ) + "\r\n";
//Origin Y (center of top left cell)
myHeader += qgsDoubleToString( myRect.yMaximum() - ( mapUnitsPerPixel() / 2 ) ) + "\r\n";
QFileInfo myInfo = QFileInfo( fileName );
// build the world file name
QString outputSuffix = myInfo.suffix();
QString myWorldFileName = myInfo.absolutePath() + '/' + myInfo.baseName() + '.'
+ outputSuffix.at( 0 ) + outputSuffix.at( myInfo.suffix().size() - 1 ) + 'w';
QFile myWorldFile( myWorldFileName );
if ( !myWorldFile.open( QIODevice::WriteOnly | QIODevice::Truncate ) ) //don't use QIODevice::Text
{
return;
}
QTextStream myStream( &myWorldFile );
myStream << myHeader;
} // saveAsImage
QgsRectangle QgsMapCanvas::extent() const
{
return mapSettings().visibleExtent();
} // extent
QgsRectangle QgsMapCanvas::fullExtent() const
{
return mapSettings().fullExtent();
} // extent
void QgsMapCanvas::setExtent( const QgsRectangle &r, bool magnified )
{
QgsRectangle current = extent();
if ( ( r == current ) && magnified )
return;
if ( r.isEmpty() )
{
if ( !mSettings.hasValidSettings() )
{
// we can't even just move the map center
QgsDebugMsg( "Empty extent - ignoring" );
return;
}
// ### QGIS 3: do not allow empty extent - require users to call setCenter() explicitly
QgsDebugMsg( "Empty extent - keeping old scale with new center!" );
setCenter( r.center() );
}
else
{
mSettings.setExtent( r, magnified );
}
emit extentsChanged();
updateScale();
if ( mLastExtent.size() > 20 )
mLastExtent.removeAt( 0 );
//clear all extent items after current index
for ( int i = mLastExtent.size() - 1; i > mLastExtentIndex; i-- )
{
mLastExtent.removeAt( i );
}
mLastExtent.append( extent() );
// adjust history to no more than 20
if ( mLastExtent.size() > 20 )
{
mLastExtent.removeAt( 0 );
}
// the last item is the current extent
mLastExtentIndex = mLastExtent.size() - 1;
// update controls' enabled state
emit zoomLastStatusChanged( mLastExtentIndex > 0 );
emit zoomNextStatusChanged( mLastExtentIndex < mLastExtent.size() - 1 );
// notify canvas items of change
updateCanvasItemPositions();
} // setExtent
void QgsMapCanvas::setCenter( const QgsPoint ¢er )
{
QgsRectangle r = mapSettings().extent();
double x = center.x();
double y = center.y();
setExtent(
QgsRectangle(
x - r.width() / 2.0, y - r.height() / 2.0,
x + r.width() / 2.0, y + r.height() / 2.0
),
true
);
} // setCenter
QgsPoint QgsMapCanvas::center() const
{
QgsRectangle r = mapSettings().extent();
return r.center();
}
double QgsMapCanvas::rotation() const
{
return mapSettings().rotation();
} // rotation
void QgsMapCanvas::setRotation( double degrees )
{
double current = rotation();
if ( degrees == current )
return;
mSettings.setRotation( degrees );
emit rotationChanged( degrees );
emit extentsChanged(); // visible extent changes with rotation
// notify canvas items of change (needed?)
updateCanvasItemPositions();
} // setRotation
void QgsMapCanvas::updateScale()
{
emit scaleChanged( mapSettings().scale() );
}
void QgsMapCanvas::zoomToFullExtent()
{
QgsRectangle extent = fullExtent();
// If the full extent is an empty set, don't do the zoom
if ( !extent.isEmpty() )
{
// Add a 5% margin around the full extent
extent.scale( 1.05 );
setExtent( extent );
}
refresh();
} // zoomToFullExtent
void QgsMapCanvas::zoomToPreviousExtent()
{
if ( mLastExtentIndex > 0 )
{
mLastExtentIndex--;
mSettings.setExtent( mLastExtent[mLastExtentIndex] );
emit extentsChanged();
updateScale();
refresh();
// update controls' enabled state
emit zoomLastStatusChanged( mLastExtentIndex > 0 );
emit zoomNextStatusChanged( mLastExtentIndex < mLastExtent.size() - 1 );
// notify canvas items of change
updateCanvasItemPositions();
}
} // zoomToPreviousExtent
void QgsMapCanvas::zoomToNextExtent()
{
if ( mLastExtentIndex < mLastExtent.size() - 1 )
{
mLastExtentIndex++;
mSettings.setExtent( mLastExtent[mLastExtentIndex] );
emit extentsChanged();
updateScale();
refresh();
// update controls' enabled state
emit zoomLastStatusChanged( mLastExtentIndex > 0 );
emit zoomNextStatusChanged( mLastExtentIndex < mLastExtent.size() - 1 );
// notify canvas items of change
updateCanvasItemPositions();
}
}// zoomToNextExtent
void QgsMapCanvas::clearExtentHistory()
{
mLastExtent.clear(); // clear the zoom history list
mLastExtent.append( extent() ) ; // set the current extent in the list
mLastExtentIndex = mLastExtent.size() - 1;
// update controls' enabled state
emit zoomLastStatusChanged( mLastExtentIndex > 0 );
emit zoomNextStatusChanged( mLastExtentIndex < mLastExtent.size() - 1 );
}// clearExtentHistory
void QgsMapCanvas::zoomToSelected( QgsVectorLayer *layer )
{
if ( !layer )
{
// use current layer by default
layer = qobject_cast<QgsVectorLayer *>( mCurrentLayer );
}
if ( !layer || layer->selectedFeatureCount() == 0 )
return;
QgsRectangle rect = mapSettings().layerExtentToOutputExtent( layer, layer->boundingBoxOfSelected() );
zoomToFeatureExtent( rect );
} // zoomToSelected
void QgsMapCanvas::zoomToFeatureExtent( QgsRectangle &rect )
{
// no selected features, only one selected point feature
//or two point features with the same x- or y-coordinates
if ( rect.isEmpty() )
{
// zoom in
QgsPoint c = rect.center();
rect = extent();
rect.scale( 1.0, &c );
}
//zoom to an area
else
{
// Expand rect to give a bit of space around the selected
// objects so as to keep them clear of the map boundaries
// The same 5% should apply to all margins.
rect.scale( 1.05 );
}
setExtent( rect );
refresh();
}
void QgsMapCanvas::zoomToFeatureIds( QgsVectorLayer *layer, const QgsFeatureIds &ids )
{
if ( !layer )
{
return;
}
QgsRectangle bbox;
QString errorMsg;
if ( boundingBoxOfFeatureIds( ids, layer, bbox, errorMsg ) )
{
zoomToFeatureExtent( bbox );
}
else
{
emit messageEmitted( tr( "Zoom to feature id failed" ), errorMsg, QgsMessageBar::WARNING );
}
}
void QgsMapCanvas::panToFeatureIds( QgsVectorLayer *layer, const QgsFeatureIds &ids )
{
if ( !layer )
{
return;
}
QgsRectangle bbox;
QString errorMsg;
if ( boundingBoxOfFeatureIds( ids, layer, bbox, errorMsg ) )
{
setCenter( bbox.center() );
refresh();
}
else
{
emit messageEmitted( tr( "Pan to feature id failed" ), errorMsg, QgsMessageBar::WARNING );