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- /* This file is part of the KDE project
- Copyright (C) 2001-2005 David Faure <faure@kde.org>
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public License
- along with this library; see the file COPYING.LIB. If not, write to
- the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA.
- */
-
- #ifndef kozoomhandler_h
- #define kozoomhandler_h
-
- #include <KoRect.h>
- #include <koffice_export.h>
- #include <KoZoomMode.h>
-
- /**
- * This class handles the zooming and DPI stuff (conversions between pt values and pixels).
- * An instance of KoZoomHandler operates at a given zoom (see setZoomAndResolution() and setZoom())
- * so there is usually one instance of KoZoomHandler per view.
- */
- class KOFFICEUI_EXPORT KoZoomHandler
- {
- public:
- KoZoomHandler();
- virtual ~KoZoomHandler() {}
-
- /**
- * Change the zoom factor to @p z (e.g. 150 for 150%)
- * and/or change the resolution, given in DPI.
- * This is done on startup, when zooming, and when printing.
- * The same call combines both so that all the updating done behind
- * the scenes is done only once, even if both zoom and DPI must be changed.
- */
- virtual void setZoomAndResolution( int zoom, int dpiX, int dpiY );
-
- /**
- * @return the conversion factor between pt and pixel, that
- * takes care of the zoom and the DPI setting.
- * Use zoomIt(pt) instead, though.
- */
- double zoomedResolutionX() const { return m_zoomedResolutionX; }
- double zoomedResolutionY() const { return m_zoomedResolutionY; }
-
- double resolutionX() const { return m_resolutionX; }
- double resolutionY() const { return m_resolutionY; }
-
- /**
- * Zoom factor for X. Equivalent to zoomedResolutionX()/resolutionX()
- */
- double zoomFactorX() const { return m_zoomedResolutionX / m_resolutionX; }
- /**
- * Zoom factor for Y. Equivalent to zoomedResolutionY()/resolutionY()
- */
- double zoomFactorY() const { return m_zoomedResolutionY / m_resolutionY; }
-
-
- /**
- * Set a resolution for X and Y, when no zoom applies (e.g. when painting an
- * embedded document. This will set the zoom to 100, and it will set
- * zoomedResolution[XY] to the resolution[XY] parameters
- * Helper method, equivalent to setZoomAndResolution(100,...).
- */
- void setResolution( double resolutionX, double resolutionY );
-
- /**
- * Set the zoomed resolution for X and Y.
- * Compared to the setZoom... methods, this allows to set a different
- * zoom factor for X and for Y.
- */
- virtual void setZoomedResolution( double zoomedResolutionX, double zoomedResolutionY );
-
- /**
- * Change the zoom level, keeping the resolution unchanged.
- * @param zoom the zoom factor (e.g. 100 for 100%)
- */
- void setZoom( int zoom );
- /**
- * Change the zoom mode
- * @param zoomMode the zoom mode.
- */
- void setZoomMode( KoZoomMode::Mode zoomMode ) { m_zoomMode = zoomMode; }
- /**
- * @return the global zoom factor (e.g. 100 for 100%).
- * Only use this to display to the user, don't use in calculations
- */
- int zoom() const { return m_zoom; }
- /**
- * @return the global zoom mode (e.g. KoZoomMode::ZOOM_WIDTH).
- * use this to determine how to zoom
- */
- KoZoomMode::Mode zoomMode() const { return m_zoomMode; }
-
- // Input: pt. Output: pixels. Resolution and zoom are applied.
- int zoomItX( double z ) const {
- return qRound( m_zoomedResolutionX * z );
- }
- int zoomItY( double z ) const {
- return qRound( m_zoomedResolutionY * z );
- }
-
- QPoint zoomPoint( const KoPoint & p ) const {
- return QPoint( zoomItX( p.x() ), zoomItY( p.y() ) );
- }
- QRect zoomRect( const KoRect & r ) const {
- QRect _r;
- _r.setCoords( zoomItX( r.left() ), zoomItY( r.top() ),
- zoomItX( r.right() ), zoomItY( r.bottom() ) );
- return _r;
- }
- /**
- * Returns the size in pixels for a input size in points.
- *
- * This function can return a size with 1 pixel to less, depending
- * on the reference point and the width and/or the zoom level.
- * It's save to use if the starting point is (0/0).
- * You can use it if you don't know the starting point yet
- * (like when inserting a picture), but then please take
- * care of it afterwards, when you know the reference point.
- */
- QSize zoomSize( const KoSize & s ) const {
- return QSize( zoomItX( s.width() ), zoomItY( s.height() ) );
- }
-
- // Input: pixels. Output: pt.
- double unzoomItX( int x ) const {
- return static_cast<double>( x ) / m_zoomedResolutionX;
- }
- double unzoomItY( int y ) const {
- return static_cast<double>( y ) / m_zoomedResolutionY;
- }
- KoPoint unzoomPoint( const QPoint & p ) const {
- return KoPoint( unzoomItX( p.x() ), unzoomItY( p.y() ) );
- }
- KoRect unzoomRect( const QRect & r ) const {
- KoRect _r;
- _r.setCoords( unzoomItX( r.left() ), unzoomItY( r.top() ),
- unzoomItX( r.right() ), unzoomItY( r.bottom() ) );
- return _r;
- }
-
-
- protected:
- int m_zoom;
- KoZoomMode::Mode m_zoomMode;
-
- double m_resolutionX;
- double m_resolutionY;
- double m_zoomedResolutionX;
- double m_zoomedResolutionY;
- };
-
- #endif
-