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Fix logic with secondary map canvases with both "sync extent" 
and "sync scale" enabled

Instead of this combination resulting in frequent unwanted changes
to the secondary canvas "scale factor" setting, ensure that
instead the desired effect of actually syncing both the canvas
extent AND scale are always kept in sync.
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@nyalldawson @github-actions
nyalldawson authored and github-actions[bot] committed Mar 30, 2023
1 parent 28b18e0 commit 77c6d93
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Showing 4 changed files with 359 additions and 2 deletions.
15 changes: 13 additions & 2 deletions src/app/qgsmapcanvasdockwidget.cpp
View file
Expand Up @@ -227,6 +227,15 @@ QgsMapCanvasDockWidget::QgsMapCanvasDockWidget( const QString &name, QWidget *pa
connect( &mResizeTimer, &QTimer::timeout, this, [ = ]
{
mBlockExtentSync = false;

if ( mSyncScaleCheckBox->isChecked() )
{
mBlockExtentSync = true;
const double scale = mMapCanvas->scale();
mMainCanvas->zoomScale( scale * mScaleFactorWidget->value() );
mBlockExtentSync = false;
}

if ( mSyncExtentCheck->isChecked() )
syncViewCenter( mMainCanvas );
} );
Expand Down Expand Up @@ -393,8 +402,10 @@ void QgsMapCanvasDockWidget::mapExtentChanged()

if ( sourceCanvas == mMapCanvas && mSyncScaleCheckBox->isChecked() )
{
const double newScaleFactor = mMainCanvas->scale() / mMapCanvas->scale();
mScaleFactorWidget->setValue( newScaleFactor );
mBlockExtentSync = true;
const double scale = mMapCanvas->scale();
mMainCanvas->zoomScale( scale * mScaleFactorWidget->value() );
mBlockExtentSync = false;
}

if ( mSyncExtentCheck->isChecked() )
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2 changes: 2 additions & 0 deletions src/app/qgsmapcanvasdockwidget.h
View file
Expand Up @@ -190,6 +190,8 @@ class APP_EXPORT QgsMapCanvasDockWidget : public QgsDockWidget, private Ui::QgsM
QgsRubberBand *mExtentRubberBand = nullptr;
void syncViewCenter( QgsMapCanvas *sourceCanvas );
void syncSelection();

friend class TestQgsMapCanvasDockWidget;
};

/**
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1 change: 1 addition & 0 deletions tests/src/app/CMakeLists.txt
View file
Expand Up @@ -18,6 +18,7 @@ set(TESTS
testqgsapplocatorfilters.cpp
testqgsdecorationscalebar.cpp
testqgsfieldcalculator.cpp
testqgsmapcanvasdockwidget.cpp
testqgsmaptooleditannotation.cpp
testqgsmaptoolidentifyaction.cpp
testqgsmaptoollabel.cpp
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343 changes: 343 additions & 0 deletions tests/src/app/testqgsmapcanvasdockwidget.cpp
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@@ -0,0 +1,343 @@
/***************************************************************************
testqgsmapcanvasdockwidget.cpp
--------------------------------------
Date : March 2023
Copyright : (C) 2023 by Nyall Dawson
Email : nyall dot dawson at gmail dot 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 "qgstest.h"

#include <QApplication>
#include <QList>
#include <QObject>
#include <QString>
#include <QStringList>
#include <QDockWidget>
#include <QSignalSpy>

#include "qgsapplication.h"
#include "qgsmapcanvas.h"
#include "qgsmapcanvasdockwidget.h"

/**
* \ingroup UnitTests
* This is a unit test for the app map canvas dock widgets.
*/
class TestQgsMapCanvasDockWidget : public QObject
{
Q_OBJECT

public:
TestQgsMapCanvasDockWidget();

private slots:
void initTestCase();// will be called before the first testfunction is executed.
void cleanupTestCase();// will be called after the last testfunction was executed.
void init() {}; // will be called before each testfunction is executed.
void cleanup() {} // will be called after every testfunction.

void testNoSync();
void testScaleSync();
void testCenterSync();
void testScaleAndCenterSync();

private:
};

TestQgsMapCanvasDockWidget::TestQgsMapCanvasDockWidget() = default;

//runs before all tests
void TestQgsMapCanvasDockWidget::initTestCase()
{
// Set up the QgsSettings environment
QCoreApplication::setOrganizationName( QStringLiteral( "QGIS" ) );
QCoreApplication::setOrganizationDomain( QStringLiteral( "qgis.org" ) );
QCoreApplication::setApplicationName( QStringLiteral( "QGIS-TEST" ) );

QgsApplication::init();
QgsApplication::initQgis();
}

//runs after all tests
void TestQgsMapCanvasDockWidget::cleanupTestCase()
{
QgsApplication::exitQgis();
}

void TestQgsMapCanvasDockWidget::testNoSync()
{
// canvases should be completely independent
QgsMapCanvas mainCanvas;
mainCanvas.setDestinationCrs( QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:3857" ) ) );
mainCanvas.setFrameStyle( QFrame::NoFrame );
mainCanvas.resize( 600, 600 );
mainCanvas.setExtent( QgsRectangle( -14839703, 2282029, -7723928, 6293534 ) );
mainCanvas.show();

QGSCOMPARENEAR( mainCanvas.scale(), 44823779, 10000 );

QgsMapCanvasDockWidget dock( QStringLiteral( "dock" ) );
dock.setMainCanvas( &mainCanvas );
dock.mapCanvas()->setDestinationCrs( QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:3857" ) ) );
dock.mapCanvas()->setFrameStyle( QFrame::NoFrame );
dock.resize( 600, 600 );
dock.mapCanvas()->setExtent( QgsRectangle( -14839703, 2282029, -7723928, 6293534 ) );
dock.show();

QGSCOMPARENEAR( dock.mapCanvas()->scale(), 44823779, 1000000 );

dock.setViewCenterSynchronized( false );
dock.setViewScaleSynchronized( false );

QSignalSpy resizeTimerSpy( &dock.mResizeTimer, &QTimer::timeout );
resizeTimerSpy.wait();

mainCanvas.zoomScale( 89647558 );

// dock should not inherit scale
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 44823779, 1000000 );

// change scale in dock and check it is not synced to main canvas
dock.mapCanvas()->zoomScale( 1500000 );
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 1500000, 1000 );
QGSCOMPARENEAR( mainCanvas.scale(), 89647558, 1000 );

// extent should NOT be synced
dock.mapCanvas()->setCenter( QgsPointXY( -22329833, 3515327 ) );
QGSCOMPARENEAR( dock.mapCanvas()->center().x(), -22329833, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->center().y(), 3515327, 1000 );
QGSCOMPARENEAR( mainCanvas.center().x(), -11281815, 1000 );
QGSCOMPARENEAR( mainCanvas.center().y(), 4287781, 1000 );

mainCanvas.setCenter( QgsPointXY( -4467497, -227904 ) );
QGSCOMPARENEAR( dock.mapCanvas()->center().x(), -22329833, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->center().y(), 3515327, 1000 );
QGSCOMPARENEAR( mainCanvas.center().x(), -4467497, 1000 );
QGSCOMPARENEAR( mainCanvas.center().y(), -227904, 1000 );
}

void TestQgsMapCanvasDockWidget::testScaleSync()
{
QgsMapCanvas mainCanvas;
mainCanvas.setDestinationCrs( QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:3857" ) ) );
mainCanvas.setFrameStyle( QFrame::NoFrame );
mainCanvas.resize( 600, 600 );
mainCanvas.setExtent( QgsRectangle( -14839703, 2282029, -7723928, 6293534 ) );
mainCanvas.show();

QGSCOMPARENEAR( mainCanvas.scale(), 44823779, 10000 );

QgsMapCanvasDockWidget dock( QStringLiteral( "dock" ) );
dock.setMainCanvas( &mainCanvas );
dock.mapCanvas()->setDestinationCrs( QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:3857" ) ) );
dock.mapCanvas()->setFrameStyle( QFrame::NoFrame );
dock.resize( 600, 600 );
dock.mapCanvas()->setExtent( QgsRectangle( -14839703, 2282029, -7723928, 6293534 ) );
dock.show();

QGSCOMPARENEAR( dock.mapCanvas()->scale(), 44823779, 1000000 );

dock.setViewCenterSynchronized( false );
dock.setViewScaleSynchronized( true );
dock.setScaleFactor( 1 );

QSignalSpy resizeTimerSpy( &dock.mResizeTimer, &QTimer::timeout );
resizeTimerSpy.wait();

mainCanvas.zoomScale( 89647558 );

// dock should inherit scale
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 89647558, 1000000 );

// ensure scale is multiplied by factor
dock.setScaleFactor( 2.5 );
mainCanvas.zoomScale( 44823779 );

QGSCOMPARENEAR( dock.mapCanvas()->scale(), 17929511, 1000000 );

// change scale in dock and check it is respected by main canvas
dock.setScaleFactor( 1.0 );
dock.mapCanvas()->zoomScale( 1500000 );
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 1500000, 1000 );
QGSCOMPARENEAR( mainCanvas.scale(), 1500000, 1000 );

dock.setScaleFactor( 2.0 );
dock.mapCanvas()->zoomScale( 1000000 );
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 1000000, 1000 );
QGSCOMPARENEAR( mainCanvas.scale(), 2000000, 1000 );

// extent should NOT be synced, and scale should not change when extent changes
dock.mapCanvas()->setCenter( QgsPointXY( -22329833, 3515327 ) );
QGSCOMPARENEAR( dock.mapCanvas()->center().x(), -22329833, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->center().y(), 3515327, 1000 );
QGSCOMPARENEAR( mainCanvas.center().x(), -11281815, 1000 );
QGSCOMPARENEAR( mainCanvas.center().y(), 4287781, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 1000000, 1000 );
QGSCOMPARENEAR( mainCanvas.scale(), 2000000, 1000 );

mainCanvas.setCenter( QgsPointXY( -4467497, -227904 ) );
QGSCOMPARENEAR( dock.mapCanvas()->center().x(), -22329833, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->center().y(), 3515327, 1000 );
QGSCOMPARENEAR( mainCanvas.center().x(), -4467497, 1000 );
QGSCOMPARENEAR( mainCanvas.center().y(), -227904, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 1000000, 1000 );
QGSCOMPARENEAR( mainCanvas.scale(), 2000000, 1000 );

dock.resize( 1200, 1200 );
resizeTimerSpy.wait();

QGSCOMPARENEAR( dock.mapCanvas()->center().x(), -22329833, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->center().y(), 3515327, 1000 );
QGSCOMPARENEAR( mainCanvas.center().x(), -4467497, 1000 );
QGSCOMPARENEAR( mainCanvas.center().y(), -227904, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 500000, 10000 );
QGSCOMPARENEAR( mainCanvas.scale(), 1000000, 100000 );
}

void TestQgsMapCanvasDockWidget::testCenterSync()
{
// canvases should be completely independent
QgsMapCanvas mainCanvas;
mainCanvas.setDestinationCrs( QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:3857" ) ) );
mainCanvas.setFrameStyle( QFrame::NoFrame );
mainCanvas.resize( 600, 600 );
mainCanvas.setExtent( QgsRectangle( -14839703, 2282029, -7723928, 6293534 ) );
mainCanvas.show();

QGSCOMPARENEAR( mainCanvas.scale(), 44823779, 10000 );

QgsMapCanvasDockWidget dock( QStringLiteral( "dock" ) );
dock.setMainCanvas( &mainCanvas );
dock.mapCanvas()->setDestinationCrs( QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:3857" ) ) );
dock.mapCanvas()->setFrameStyle( QFrame::NoFrame );
dock.resize( 600, 600 );
dock.mapCanvas()->setExtent( QgsRectangle( -14839703, 2282029, -7723928, 6293534 ) );
dock.show();

QGSCOMPARENEAR( dock.mapCanvas()->scale(), 44823779, 1000000 );

dock.setViewCenterSynchronized( true );
dock.setViewScaleSynchronized( false );

QSignalSpy resizeTimerSpy( &dock.mResizeTimer, &QTimer::timeout );
resizeTimerSpy.wait();

mainCanvas.zoomScale( 89647558 );

// dock should not inherit scale
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 44823779, 1000000 );

// change scale in dock and check it is not synced to main canvas
dock.mapCanvas()->zoomScale( 1500000 );
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 1500000, 1000 );
QGSCOMPARENEAR( mainCanvas.scale(), 89647558, 1000 );

// center SHOULD be synced
dock.mapCanvas()->setCenter( QgsPointXY( -22329833, 3515327 ) );
QGSCOMPARENEAR( dock.mapCanvas()->center().x(), -22329833, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->center().y(), 3515327, 1000 );
QGSCOMPARENEAR( mainCanvas.center().x(), -22329833, 1000 );
QGSCOMPARENEAR( mainCanvas.center().y(), 3515327, 1000 );

mainCanvas.setCenter( QgsPointXY( -4467497, -227904 ) );
QGSCOMPARENEAR( dock.mapCanvas()->center().x(), -4467497, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->center().y(), -227904, 1000 );
QGSCOMPARENEAR( mainCanvas.center().x(), -4467497, 1000 );
QGSCOMPARENEAR( mainCanvas.center().y(), -227904, 1000 );

dock.resize( 1200, 1200 );
resizeTimerSpy.wait();

QGSCOMPARENEAR( dock.mapCanvas()->center().x(), -4467497, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->center().y(), -227904, 1000 );
QGSCOMPARENEAR( mainCanvas.center().x(), -4467497, 1000 );
QGSCOMPARENEAR( mainCanvas.center().y(), -227904, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 744966, 10000 );
QGSCOMPARENEAR( mainCanvas.scale(), 89647558, 1000 );
}

void TestQgsMapCanvasDockWidget::testScaleAndCenterSync()
{
// canvases should be completely independent
QgsMapCanvas mainCanvas;
mainCanvas.setDestinationCrs( QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:3857" ) ) );
mainCanvas.setFrameStyle( QFrame::NoFrame );
mainCanvas.resize( 600, 600 );
mainCanvas.setExtent( QgsRectangle( -14839703, 2282029, -7723928, 6293534 ) );
mainCanvas.show();

QGSCOMPARENEAR( mainCanvas.scale(), 44823779, 10000 );

QgsMapCanvasDockWidget dock( QStringLiteral( "dock" ) );
dock.setMainCanvas( &mainCanvas );
dock.mapCanvas()->setDestinationCrs( QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:3857" ) ) );
dock.mapCanvas()->setFrameStyle( QFrame::NoFrame );
dock.resize( 600, 600 );
dock.mapCanvas()->setExtent( QgsRectangle( -14839703, 2282029, -7723928, 6293534 ) );
dock.show();

QGSCOMPARENEAR( dock.mapCanvas()->scale(), 44823779, 1000000 );

dock.setViewCenterSynchronized( true );
dock.setViewScaleSynchronized( true );

QSignalSpy resizeTimerSpy( &dock.mResizeTimer, &QTimer::timeout );
resizeTimerSpy.wait();

mainCanvas.zoomScale( 89647558 );

// dock should inherit scale
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 89647558, 1000000 );

// ensure scale is multiplied by factor
dock.setScaleFactor( 2.5 );
mainCanvas.zoomScale( 44823779 );

QGSCOMPARENEAR( dock.mapCanvas()->scale(), 17929511, 1000000 );

// change scale in dock and check it is respected by main canvas
dock.setScaleFactor( 1.0 );
dock.mapCanvas()->zoomScale( 1500000 );
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 1500000, 1000 );
QGSCOMPARENEAR( mainCanvas.scale(), 1500000, 1000 );

dock.setScaleFactor( 2.0 );
dock.mapCanvas()->zoomScale( 1000000 );
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 1000000, 1000 );
QGSCOMPARENEAR( mainCanvas.scale(), 2000000, 1000 );

// center SHOULD be synced
dock.mapCanvas()->setCenter( QgsPointXY( -22329833, 3515327 ) );
QGSCOMPARENEAR( dock.mapCanvas()->center().x(), -22329833, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->center().y(), 3515327, 1000 );
QGSCOMPARENEAR( mainCanvas.center().x(), -22329833, 1000 );
QGSCOMPARENEAR( mainCanvas.center().y(), 3515327, 1000 );

mainCanvas.setCenter( QgsPointXY( -4467497, -227904 ) );
QGSCOMPARENEAR( dock.mapCanvas()->center().x(), -4467497, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->center().y(), -227904, 1000 );
QGSCOMPARENEAR( mainCanvas.center().x(), -4467497, 1000 );
QGSCOMPARENEAR( mainCanvas.center().y(), -227904, 1000 );

dock.resize( 1200, 1200 );
resizeTimerSpy.wait();

QGSCOMPARENEAR( dock.mapCanvas()->center().x(), -4467497, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->center().y(), -227904, 1000 );
QGSCOMPARENEAR( mainCanvas.center().x(), -4467497, 1000 );
QGSCOMPARENEAR( mainCanvas.center().y(), -227904, 1000 );
QGSCOMPARENEAR( dock.mapCanvas()->scale(), 500000, 10000 );
QGSCOMPARENEAR( mainCanvas.scale(), 1000000, 100000 );
}



QGSTEST_MAIN( TestQgsMapCanvasDockWidget )
#include "testqgsmapcanvasdockwidget.moc"

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