/
qgsmapcanvas.cpp
2000 lines (1617 loc) · 49.6 KB
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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 <QSettings>
#include <QTextStream>
#include <QResizeEvent>
#include <QString>
#include <QStringList>
#include <QWheelEvent>
#include "qgis.h"
#include "qgsapplication.h"
#include "qgscrscache.h"
#include "qgsdatumtransformdialog.h"
#include "qgslogger.h"
#include "qgsmapcanvas.h"
#include "qgsmapcanvasmap.h"
#include "qgsmapcanvassnappingutils.h"
#include "qgsmaplayer.h"
#include "qgsmaplayerregistry.h"
#include "qgsmaptoolpan.h"
#include "qgsmaptoolzoom.h"
#include "qgsmaptopixel.h"
#include "qgsmapoverviewcanvas.h"
#include "qgsmaprenderer.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 <math.h>
/** 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;
};
QgsMapCanvasRendererSync::QgsMapCanvasRendererSync( QgsMapCanvas* canvas, QgsMapRenderer* renderer )
: QObject( canvas )
, mCanvas( canvas )
, mRenderer( renderer )
, mSyncingExtent( false )
{
connect( mCanvas, SIGNAL( extentsChanged() ), this, SLOT( onExtentC2R() ) );
connect( mRenderer, SIGNAL( extentsChanged() ), this, SLOT( onExtentR2C() ) );
connect( mCanvas, SIGNAL( mapUnitsChanged() ), this, SLOT( onMapUnitsC2R() ) );
connect( mRenderer, SIGNAL( mapUnitsChanged() ), this, SLOT( onMapUnitsR2C() ) );
connect( mCanvas, SIGNAL( rotationChanged( double ) ), this, SLOT( onMapRotationC2R() ) );
connect( mRenderer, SIGNAL( rotationChanged( double ) ), this, SLOT( onMapRotationR2C() ) );
connect( mCanvas, SIGNAL( hasCrsTransformEnabledChanged( bool ) ), this, SLOT( onCrsTransformC2R() ) );
connect( mRenderer, SIGNAL( hasCrsTransformEnabled( bool ) ), this, SLOT( onCrsTransformR2C() ) );
connect( mCanvas, SIGNAL( destinationCrsChanged() ), this, SLOT( onDestCrsC2R() ) );
connect( mRenderer, SIGNAL( destinationSrsChanged() ), this, SLOT( onDestCrsR2C() ) );
connect( mCanvas, SIGNAL( layersChanged() ), this, SLOT( onLayersC2R() ) );
// TODO: layers R2C ? (should not happen!)
}
void QgsMapCanvasRendererSync::onExtentC2R()
{
// protection against possible bounce back
if ( mSyncingExtent )
return;
mSyncingExtent = true;
mRenderer->setExtent( mCanvas->mapSettings().extent() );
mSyncingExtent = false;
}
void QgsMapCanvasRendererSync::onExtentR2C()
{
// protection against possible bounce back
if ( mSyncingExtent )
return;
mSyncingExtent = true;
mCanvas->setExtent( mRenderer->extent() );
mSyncingExtent = false;
}
void QgsMapCanvasRendererSync::onMapUnitsC2R()
{
mRenderer->setMapUnits( mCanvas->mapSettings().mapUnits() );
}
void QgsMapCanvasRendererSync::onMapUnitsR2C()
{
mCanvas->setMapUnits( mRenderer->mapUnits() );
}
void QgsMapCanvasRendererSync::onMapRotationR2C()
{
mCanvas->setRotation( mRenderer->rotation() );
}
void QgsMapCanvasRendererSync::onMapRotationC2R()
{
mRenderer->setRotation( mCanvas->rotation() );
}
void QgsMapCanvasRendererSync::onCrsTransformC2R()
{
mRenderer->setProjectionsEnabled( mCanvas->mapSettings().hasCrsTransformEnabled() );
}
void QgsMapCanvasRendererSync::onCrsTransformR2C()
{
mCanvas->setCrsTransformEnabled( mRenderer->hasCrsTransformEnabled() );
}
void QgsMapCanvasRendererSync::onDestCrsC2R()
{
mRenderer->setDestinationCrs( mCanvas->mapSettings().destinationCrs(), true, false );
}
void QgsMapCanvasRendererSync::onDestCrsR2C()
{
mCanvas->setDestinationCrs( mRenderer->destinationCrs() );
}
void QgsMapCanvasRendererSync::onLayersC2R()
{
mRenderer->setLayerSet( mCanvas->mapSettings().layers() );
}
QgsMapCanvas::QgsMapCanvas( QWidget * parent, const char *name )
: QGraphicsView( parent )
, mCanvasProperties( new CanvasProperties )
, mJob( nullptr )
, mJobCancelled( false )
, mLabelingResults( nullptr )
, mUseParallelRendering( false )
, mDrawRenderingStats( false )
, mCache( nullptr )
, mPreviewEffect( nullptr )
, mSnappingUtils( nullptr )
{
setObjectName( name );
mScene = new QGraphicsScene();
setScene( mScene );
setHorizontalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
setVerticalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
mLastExtentIndex = -1;
mCurrentLayer = nullptr;
mMapOverview = nullptr;
mMapTool = nullptr;
mLastNonZoomMapTool = nullptr;
mFrozen = false;
mRefreshScheduled = false;
setWheelAction( WheelZoom );
// by default, the canvas is rendered
mRenderFlag = true;
setMouseTracking( true );
setFocusPolicy( Qt::StrongFocus );
mMapRenderer = new QgsMapRenderer;
mResizeTimer = new QTimer( this );
mResizeTimer->setSingleShot( true );
connect( mResizeTimer, SIGNAL( timeout() ), this, SLOT( refresh() ) );
// create map canvas item which will show the map
mMap = new QgsMapCanvasMap( this );
// project handling
connect( QgsProject::instance(), SIGNAL( readProject( const QDomDocument & ) ),
this, SLOT( readProject( const QDomDocument & ) ) );
connect( QgsProject::instance(), SIGNAL( writeProject( QDomDocument & ) ),
this, SLOT( writeProject( QDomDocument & ) ) );
mSettings.setFlag( QgsMapSettings::DrawEditingInfo );
mSettings.setFlag( QgsMapSettings::UseRenderingOptimization );
// class that will sync most of the changes between canvas and (legacy) map renderer
// it is parented to map canvas, will be deleted automatically
new QgsMapCanvasRendererSync( this, mMapRenderer );
QSize s = viewport()->size();
mSettings.setOutputSize( s );
mMapRenderer->setOutputSize( s, mSettings.outputDpi() );
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 );
setInteractive( false );
refresh();
} // QgsMapCanvas ctor
QgsMapCanvas::~QgsMapCanvas()
{
if ( mMapTool )
{
mMapTool->deactivate();
mMapTool = nullptr;
}
mLastNonZoomMapTool = nullptr;
// delete canvas items prior to deleteing 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
delete mMapRenderer;
// mCanvasProperties auto-deleted via QScopedPointer
// CanvasProperties struct has its own dtor for freeing resources
if ( mJob )
{
mJob->cancel();
Q_ASSERT( !mJob );
}
delete mCache;
delete mLabelingResults;
} // dtor
void QgsMapCanvas::enableAntiAliasing( bool theFlag )
{
mSettings.setFlag( QgsMapSettings::Antialiasing, theFlag );
if ( mMapOverview )
mMapOverview->enableAntiAliasing( theFlag );
} // anti aliasing
void QgsMapCanvas::enableMapTileRendering( bool theFlag )
{
mSettings.setFlag( QgsMapSettings::RenderMapTile, theFlag );
}
void QgsMapCanvas::useImageToRender( bool theFlag )
{
Q_UNUSED( theFlag );
}
QgsMapCanvasMap* QgsMapCanvas::map()
{
return mMap;
}
QgsMapRenderer* QgsMapCanvas::mapRenderer()
{
return mMapRenderer;
}
QgsMapLayer* QgsMapCanvas::layer( int index )
{
const QStringList& layers = mapSettings().layers();
if ( index >= 0 && index < ( int ) layers.size() )
return QgsMapLayerRegistry::instance()->mapLayer( layers[index] );
else
return nullptr;
}
void QgsMapCanvas::setCurrentLayer( QgsMapLayer* layer )
{
mCurrentLayer = layer;
emit currentLayerChanged( layer );
}
double QgsMapCanvas::scale()
{
return mapSettings().scale();
} // scale
void QgsMapCanvas::setDirty( bool dirty )
{
if ( dirty )
refresh();
}
bool QgsMapCanvas::isDirty() const
{
return false;
}
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::setLayerSet( QList<QgsMapCanvasLayer> &layers )
{
// create layer set
QStringList layerSet, layerSetOverview;
int i;
for ( i = 0; i < layers.size(); i++ )
{
QgsMapCanvasLayer &lyr = layers[i];
if ( !lyr.layer() )
{
continue;
}
if ( lyr.isVisible() )
{
layerSet.push_back( lyr.layer()->id() );
}
if ( lyr.isInOverview() )
{
layerSetOverview.push_back( lyr.layer()->id() );
}
}
const QStringList& layerSetOld = mapSettings().layers();
bool layerSetChanged = layerSetOld != layerSet;
// update only if needed
if ( layerSetChanged )
{
QgsDebugMsg( "Layers changed to: " + layerSet.join( ", " ) );
for ( i = 0; i < layerCount(); i++ )
{
// Add check if vector layer when disconnecting from selectionChanged slot
// Ticket #811 - racicot
QgsMapLayer *currentLayer = layer( i );
if ( !currentLayer )
continue;
disconnect( currentLayer, SIGNAL( repaintRequested() ), this, SLOT( refresh() ) );
disconnect( currentLayer, SIGNAL( layerCrsChanged() ), this, SLOT( layerCrsChange() ) );
QgsVectorLayer *isVectLyr = qobject_cast<QgsVectorLayer *>( currentLayer );
if ( isVectLyr )
{
disconnect( currentLayer, SIGNAL( selectionChanged() ), this, SLOT( selectionChangedSlot() ) );
}
}
mSettings.setLayers( layerSet );
for ( i = 0; i < layerCount(); i++ )
{
// Add check if vector layer when connecting to selectionChanged slot
// Ticket #811 - racicot
QgsMapLayer *currentLayer = layer( i );
connect( currentLayer, SIGNAL( repaintRequested() ), this, SLOT( refresh() ) );
connect( currentLayer, SIGNAL( layerCrsChanged() ), this, SLOT( layerCrsChange() ) );
QgsVectorLayer *isVectLyr = qobject_cast<QgsVectorLayer *>( currentLayer );
if ( isVectLyr )
{
connect( currentLayer, SIGNAL( selectionChanged() ), this, SLOT( selectionChangedSlot() ) );
}
}
updateDatumTransformEntries();
QgsDebugMsg( "Layers have changed, refreshing" );
emit layersChanged();
refresh();
}
if ( mMapOverview )
{
const QStringList& layerSetOvOld = mMapOverview->layerSet();
if ( layerSetOvOld != layerSetOverview )
{
mMapOverview->setLayerSet( layerSetOverview );
}
// refresh overview maplayers even if layer set is the same
// because full extent might have changed
updateOverview();
}
} // setLayerSet
void QgsMapCanvas::enableOverviewMode( QgsMapOverviewCanvas* overview )
{
if ( mMapOverview )
{
// disconnect old map overview if exists
disconnect( this, SIGNAL( hasCrsTransformEnabledChanged( bool ) ),
mMapOverview, SLOT( hasCrsTransformEnabled( bool ) ) );
disconnect( this, SIGNAL( destinationCrsChanged() ),
mMapOverview, SLOT( destinationSrsChanged() ) );
// map overview is not owned by map canvas so don't delete it...
}
mMapOverview = overview;
if ( overview )
{
// connect to the map render to copy its projection settings
connect( this, SIGNAL( hasCrsTransformEnabledChanged( bool ) ),
overview, SLOT( hasCrsTransformEnabled( bool ) ) );
connect( this, SIGNAL( destinationCrsChanged() ),
overview, SLOT( destinationSrsChanged() ) );
}
}
const QgsMapSettings &QgsMapCanvas::mapSettings() const
{
return mSettings;
}
void QgsMapCanvas::setCrsTransformEnabled( bool enabled )
{
if ( mSettings.hasCrsTransformEnabled() == enabled )
return;
mSettings.setCrsTransformEnabled( enabled );
updateDatumTransformEntries();
refresh();
emit hasCrsTransformEnabledChanged( enabled );
}
void QgsMapCanvas::setDestinationCrs( const QgsCoordinateReferenceSystem &crs )
{
if ( mSettings.destinationCrs() == crs )
return;
if ( mSettings.hasCrsTransformEnabled() )
{
// 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 )
{
QgsDebugMsg( QString( "Transform error caught: %1" ).arg( e.what() ) );
}
}
if ( !rect.isEmpty() )
{
setExtent( rect );
}
QgsDebugMsg( "refreshing after destination CRS changed" );
refresh();
}
mSettings.setDestinationCrs( crs );
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 timeMiliseconds )
{
mMapUpdateTimer.setInterval( timeMiliseconds );
}
int QgsMapCanvas::mapUpdateInterval() const
{
return mMapUpdateTimer.interval();
}
void QgsMapCanvas::updateOverview()
{
// redraw overview
if ( mMapOverview )
{
mMapOverview->refresh();
}
}
QgsMapLayer* QgsMapCanvas::currentLayer()
{
return mCurrentLayer;
}
void QgsMapCanvas::refresh()
{
if ( !mSettings.hasValidSettings() )
{
QgsDebugMsg( "CANVAS refresh - invalid settings -> nothing to do" );
return;
}
if ( !mRenderFlag || mFrozen ) // do we really need two flags controlling rendering?
{
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 );
QgsDebugMsg( "CANVAS refresh!" );
stopRendering(); // if any...
// from now on we can accept refresh requests again
mRefreshScheduled = false;
//build the expression context
QgsExpressionContext expressionContext;
expressionContext << QgsExpressionContextUtils::globalScope()
<< QgsExpressionContextUtils::projectScope()
<< QgsExpressionContextUtils::mapSettingsScope( mSettings )
<< new QgsExpressionContextScope( mExpressionContextScope );
mSettings.setExpressionContext( expressionContext );
// create the renderer job
Q_ASSERT( !mJob );
mJobCancelled = false;
if ( mUseParallelRendering )
mJob = new QgsMapRendererParallelJob( mSettings );
else
mJob = new QgsMapRendererSequentialJob( mSettings );
connect( mJob, SIGNAL( finished() ), SLOT( rendererJobFinished() ) );
mJob->setCache( mCache );
QStringList layersForGeometryCache;
Q_FOREACH ( const QString& id, mSettings.layers() )
{
if ( QgsVectorLayer* vl = qobject_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( id ) ) )
{
if ( vl->isEditable() )
layersForGeometryCache << id;
}
}
mJob->setRequestedGeometryCacheForLayers( layersForGeometryCache );
mJob->start();
mMapUpdateTimer.start();
emit renderStarting();
}
void QgsMapCanvas::rendererJobFinished()
{
QgsDebugMsg( QString( "CANVAS finish! %1" ).arg( !mJobCancelled ) );
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 ( !mJobCancelled )
{
// take labeling results before emitting renderComplete, so labeling map tools
// connected to signal work with correct results
delete mLabelingResults;
mLabelingResults = mJob->takeLabelingResults();
QImage img = mJob->renderedImage();
// emit renderComplete to get our decorations drawn
QPainter p( &img );
emit renderComplete( &p );
QSettings settings;
if ( settings.value( "/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 = QString( "%1 :: %2 ms" ).arg( mUseParallelRendering ? "PARALLEL" : "SEQUENTIAL" ).arg( mJob->renderingTime() );
p.drawText( r, msg, QTextOption( Qt::AlignCenter ) );
}
p.end();
mMap->setContent( img, imageRect( img, mJob->mapSettings() ) );
}
// 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()
{
const QImage& img = mJob->renderedImage();
mMap->setContent( img, imageRect( img, mJob->mapSettings() ) );
}
void QgsMapCanvas::stopRendering()
{
if ( mJob )
{
QgsDebugMsg( "CANVAS stop rendering!" );
mJobCancelled = true;
mJob->cancel();
Q_ASSERT( !mJob ); // no need to delete here: already deleted in finished()
}
}
void QgsMapCanvas::updateMap()
{
}
//the format defaults to "PNG" if not specified
void QgsMapCanvas::saveAsImage( const QString& theFileName, QPixmap * theQPixmap, const QString& theFormat )
{
//
//check if the optional QPaintDevice was supplied
//
if ( theQPixmap )
{
// render
QPainter painter;
painter.begin( theQPixmap );
QgsMapRendererCustomPainterJob job( mSettings, &painter );
job.start();
job.waitForFinished();
emit renderComplete( &painter );
painter.end();
theQPixmap->save( theFileName, theFormat.toLocal8Bit().data() );
}
else //use the map view
{
mMap->contentImage().save( theFileName, theFormat.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 += "0 \r\n";
//Rotation on x axis - hard coded
myHeader += "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( theFileName );
// allow dotted names
QString myWorldFileName = myInfo.absolutePath() + '/' + myInfo.completeBaseName() + '.' + theFormat + 'w';
QFile myWorldFile( myWorldFileName );
if ( !myWorldFile.open( QIODevice::WriteOnly ) ) //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( QgsRectangle const & r )
{
QgsRectangle current = extent();
if ( r == current )
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 );
}
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& center )
{
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
)
);
} // 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 )
{
if ( !rotationEnabled() )
return;
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::clear()
{
refresh();
} // clear
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 );