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Commit 14c6656

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nirvnnirvn
committedApr 23, 2023
[qgsquick] New map to screen class to tie QML items to the map canvas
·
ltr-3_40final-3_32_0
1 parent 2d4f1a8 commit 14c6656

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4 files changed

+239
-1
lines changed

4 files changed

+239
-1
lines changed
 

‎src/quickgui/CMakeLists.txt

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@@ -5,6 +5,7 @@ set(QGIS_QUICK_GUI_MOC_HDRS
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qgsquickelevationprofilecanvas.h
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qgsquickmapcanvasmap.h
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qgsquickmapsettings.h
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qgsquickmaptoscreen.h
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qgsquickmaptransform.h
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qgsquickutils.h
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)
@@ -14,6 +15,7 @@ set(QGIS_QUICK_GUI_SRC
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qgsquickelevationprofilecanvas.cpp
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qgsquickmapcanvasmap.cpp
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qgsquickmapsettings.cpp
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qgsquickmaptoscreen.cpp
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qgsquickmaptransform.cpp
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qgsquickutils.cpp
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)

‎src/quickgui/qgsquickmaptoscreen.cpp

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/***************************************************************************
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qgsquickmaptoscreen.cpp
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----------------------------------------------------
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Date : 22.08.2018
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Copyright : (C) 2018 by Denis Rouzaud
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Email : denis (at) opengis.ch
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "qgsquickmaptoscreen.h"
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#include "qgspoint.h"
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QgsQuickMapToScreen::QgsQuickMapToScreen( QObject *parent )
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: QObject( parent )
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{
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}
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void QgsQuickMapToScreen::setMapSettings( QgsQuickMapSettings *mapSettings )
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{
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if ( mMapSettings == mapSettings )
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return;
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if ( mMapSettings )
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{
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disconnect( mMapSettings, &QgsQuickMapSettings::extentChanged, this, &QgsQuickMapToScreen::transformPoint );
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disconnect( mMapSettings, &QgsQuickMapSettings::rotationChanged, this, &QgsQuickMapToScreen::transformPoint );
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disconnect( mMapSettings, &QgsQuickMapSettings::outputSizeChanged, this, &QgsQuickMapToScreen::transformPoint );
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}
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mMapSettings = mapSettings;
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connect( mMapSettings, &QgsQuickMapSettings::extentChanged, this, &QgsQuickMapToScreen::transformPoint );
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connect( mMapSettings, &QgsQuickMapSettings::rotationChanged, this, &QgsQuickMapToScreen::transformPoint );
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connect( mMapSettings, &QgsQuickMapSettings::outputSizeChanged, this, &QgsQuickMapToScreen::transformPoint );
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transformPoint();
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transformDistance();
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emit mapSettingsChanged();
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}
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QgsQuickMapSettings *QgsQuickMapToScreen::mapSettings() const
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{
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return mMapSettings;
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}
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void QgsQuickMapToScreen::setMapPoint( const QgsPoint &point )
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{
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if ( mMapPoint == point )
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return;
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mMapPoint = point;
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emit mapPointChanged();
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transformPoint();
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}
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QgsPoint QgsQuickMapToScreen::mapPoint() const
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{
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return mMapPoint;
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}
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QPointF QgsQuickMapToScreen::screenPoint() const
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{
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return mScreenPoint;
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}
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void QgsQuickMapToScreen::transformPoint()
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{
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if ( !mMapSettings )
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{
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mScreenPoint = QPointF();
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}
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else
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{
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mScreenPoint = mMapSettings->coordinateToScreen( mMapPoint );
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}
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emit screenPointChanged();
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}
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void QgsQuickMapToScreen::setMapDistance( const double distance )
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{
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if ( mMapDistance == distance )
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return;
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mMapDistance = distance;
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emit mapDistanceChanged();
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transformDistance();
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}
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double QgsQuickMapToScreen::mapDistance() const
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{
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return mMapDistance;
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}
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double QgsQuickMapToScreen::screenDistance() const
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{
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return mScreenDistance;
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}
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void QgsQuickMapToScreen::transformDistance()
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{
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if ( !mMapSettings || qgsDoubleNear( mMapDistance, 0.0 ) || qgsDoubleNear( mMapSettings->mapUnitsPerPoint(), 0.0 ) )
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{
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mScreenDistance = 0.0;
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}
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else
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{
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mScreenDistance = mMapDistance / mMapSettings->mapUnitsPerPoint();
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}
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emit screenDistanceChanged();
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}

‎src/quickgui/qgsquickmaptoscreen.h

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/***************************************************************************
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qgsquickmaptoscreen.h
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----------------------------------------------------
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Date : 22.08.2018
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Copyright : (C) 2018 by Denis Rouzaud
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Email : denis (at) opengis.ch
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef QGSQUICKMAPTOSCREEN_H
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#define QGSQUICKMAPTOSCREEN_H
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#include "qgsquickmapsettings.h"
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#include <QObject>
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#include <QPointF>
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#include <qgspoint.h>
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/**
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* \ingroup quick
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*
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* @brief The QgsQuickMapToScreen class transform map points to screen coordinates as
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* well as distances from map to screen units. Screen points and/or distances will be
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* automatically updated on map extent changes.
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*
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* \since QGIS 3.32
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*/
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class QUICK_EXPORT QgsQuickMapToScreen : public QObject
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{
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Q_OBJECT
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//! Map settings used to define the map canvas CRS and detect any extent change
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Q_PROPERTY( QgsQuickMapSettings *mapSettings READ mapSettings WRITE setMapSettings NOTIFY mapSettingsChanged )
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//! Point in map coordinates
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Q_PROPERTY( QgsPoint mapPoint READ mapPoint WRITE setMapPoint NOTIFY mapPointChanged )
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//! Point in screen coordinates (read-only)
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Q_PROPERTY( QPointF screenPoint READ screenPoint NOTIFY screenPointChanged )
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//! Distance in map unit
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Q_PROPERTY( double mapDistance READ mapDistance WRITE setMapDistance NOTIFY mapDistanceChanged )
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//! Distance in screen coordinates (read-only)
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Q_PROPERTY( double screenDistance READ screenDistance NOTIFY screenDistanceChanged )
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public:
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explicit QgsQuickMapToScreen( QObject *parent = nullptr );
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//! \copydoc mapSettings
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void setMapSettings( QgsQuickMapSettings *mapSettings );
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//! \copydoc mapSettings
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QgsQuickMapSettings *mapSettings() const;
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//! \copydoc mapPoint
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void setMapPoint( const QgsPoint &point );
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//! \copydoc mapPoint
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QgsPoint mapPoint() const;
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//! \copydoc mapDistance
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void setMapDistance( const double distance );
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//! \copydoc mapDistance
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double mapDistance() const;
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//! \copydoc screenPoint
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QPointF screenPoint() const;
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//! \copydoc screenDistance
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double screenDistance() const;
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signals:
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//! \copydoc mapSettings
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void mapSettingsChanged();
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//! \copydoc mapPoint
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void mapPointChanged();
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//! \copydoc mapDistance
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void mapDistanceChanged();
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//! \copydoc screenPoint
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void screenPointChanged();
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//! \copydoc screenDistance
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void screenDistanceChanged();
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private slots:
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void transformPoint();
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void transformDistance();
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private:
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QgsQuickMapSettings *mMapSettings = nullptr;
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QgsPoint mMapPoint = QgsPoint();
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double mMapDistance = 0.0;
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QPointF mScreenPoint = QPointF();
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double mScreenDistance = 0.0;
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};
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#endif // QGSQUICKMAPTOSCREEN_H

‎tests/src/quickgui/testqgsquickmapsettings.cpp

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#include <QObject>
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#include <QApplication>
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#include "qgis.h"
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#include "qgsapplication.h"
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#include "qgstest.h"
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#include "qgis.h"
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#include "qgspoint.h"
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#include "qgsunittypes.h"
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#include "qgsquickmapsettings.h"
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#include "qgsquickmaptoscreen.h"
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class TestQgsQuickMapSettings: public QObject
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{
@@ -30,6 +32,7 @@ class TestQgsQuickMapSettings: public QObject
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void cleanup() {} // will be called after every testfunction.
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void test_project_existency();
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void test_map_to_screen();
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};
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void TestQgsQuickMapSettings::test_project_existency()
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delete settings;
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}
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void TestQgsQuickMapSettings::test_map_to_screen()
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{
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QgsQuickMapSettings *settings = new QgsQuickMapSettings();
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settings->setOutputSize( QSize( 10, 10 ) );
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settings->setExtent( QgsRectangle( 0, 0, 10, 10 ) );
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QgsPoint point( 5, 5 );
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QgsQuickMapToScreen *mapToScreen = new QgsQuickMapToScreen();
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mapToScreen->setMapSettings( settings );
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mapToScreen->setMapPoint( point );
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QCOMPARE( mapToScreen->screenPoint(), QPointF( 5, 5 ) );
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}
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QGSTEST_MAIN( TestQgsQuickMapSettings )
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#include "testqgsquickmapsettings.moc"

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