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https://github.com/qgis/QGIS.git
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7ae8e16427
Add support for SVG cursor:
ZoomIn,
ZoomOut,
Identify,
CrossHair,
CapturePoint,
Select,
Sampler,
Icons are provisional: they need some love from
a decent graphics designer.
Fixes #12671
141 lines
3.9 KiB
C++
141 lines
3.9 KiB
C++
/***************************************************************************
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qgsmaptoolzoom.cpp - map tool for zooming
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----------------------
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begin : January 2006
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copyright : (C) 2006 by Martin Dobias
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email : wonder.sk at gmail dot com
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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 "qgsmaptoolzoom.h"
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#include "qgsmapcanvas.h"
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#include "qgsmaptopixel.h"
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#include "qgsrubberband.h"
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#include <QMouseEvent>
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#include <QRect>
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#include <QColor>
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#include <QCursor>
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#include <QPixmap>
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#include "qgslogger.h"
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QgsMapToolZoom::QgsMapToolZoom( QgsMapCanvas *canvas, bool zoomOut )
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: QgsMapTool( canvas )
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, mZoomOut( zoomOut )
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, mDragging( false )
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{
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mToolName = tr( "Zoom" );
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// set the cursor
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mCursor = zoomOut ? QgsApplication::getThemeCursor( QgsApplication::Cursor::ZoomOut ) :
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QgsApplication::getThemeCursor( QgsApplication::Cursor::ZoomIn );
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}
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QgsMapToolZoom::~QgsMapToolZoom()
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{
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delete mRubberBand;
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}
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void QgsMapToolZoom::canvasMoveEvent( QgsMapMouseEvent *e )
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{
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if ( !( e->buttons() & Qt::LeftButton ) )
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return;
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if ( !mDragging )
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{
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mDragging = true;
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delete mRubberBand;
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mRubberBand = new QgsRubberBand( mCanvas, QgsWkbTypes::PolygonGeometry );
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QColor color( Qt::blue );
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color.setAlpha( 63 );
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mRubberBand->setColor( color );
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mZoomRect.setTopLeft( e->pos() );
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}
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mZoomRect.setBottomRight( e->pos() );
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if ( mRubberBand )
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{
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mRubberBand->setToCanvasRectangle( mZoomRect );
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mRubberBand->show();
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}
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}
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void QgsMapToolZoom::canvasPressEvent( QgsMapMouseEvent *e )
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{
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if ( e->button() != Qt::LeftButton )
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return;
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mZoomRect.setRect( 0, 0, 0, 0 );
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}
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void QgsMapToolZoom::canvasReleaseEvent( QgsMapMouseEvent *e )
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{
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if ( e->button() != Qt::LeftButton )
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return;
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bool zoomOut = mZoomOut;
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if ( e->modifiers() & Qt::AltModifier )
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zoomOut = !zoomOut;
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// We are not really dragging in this case. This is sometimes caused by
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// a pen based computer reporting a press, move, and release, all the
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// one point.
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if ( mDragging && ( mZoomRect.topLeft() == mZoomRect.bottomRight() ) )
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{
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mDragging = false;
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delete mRubberBand;
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mRubberBand = nullptr;
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}
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if ( mDragging )
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{
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mDragging = false;
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delete mRubberBand;
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mRubberBand = nullptr;
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// store the rectangle
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mZoomRect.setRight( e->pos().x() );
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mZoomRect.setBottom( e->pos().y() );
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//account for bottom right -> top left dragging
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mZoomRect = mZoomRect.normalized();
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// set center and zoom
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const QSize &zoomRectSize = mZoomRect.size();
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const QgsMapSettings &mapSettings = mCanvas->mapSettings();
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const QSize &canvasSize = mapSettings.outputSize();
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double sfx = ( double )zoomRectSize.width() / canvasSize.width();
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double sfy = ( double )zoomRectSize.height() / canvasSize.height();
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double sf = std::max( sfx, sfy );
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const QgsMapToPixel *m2p = mCanvas->getCoordinateTransform();
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QgsPointXY c = m2p->toMapCoordinates( mZoomRect.center() );
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mCanvas->zoomByFactor( zoomOut ? 1.0 / sf : sf, &c );
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mCanvas->refresh();
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}
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else // not dragging
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{
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// change to zoom in/out by the default multiple
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mCanvas->zoomWithCenter( e->x(), e->y(), !zoomOut );
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}
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}
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void QgsMapToolZoom::deactivate()
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{
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delete mRubberBand;
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mRubberBand = nullptr;
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QgsMapTool::deactivate();
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}
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