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33fc476d89
* require qwt >=6.2 (and fallback to internal 6.3 if system's qwt doesn't suffice) * debian doesn't have qwt for Qt6 and won't have it for trixie
1540 lines
41 KiB
C++
1540 lines
41 KiB
C++
/******************************************************************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#include "qwt_painter.h"
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#include "qwt_math.h"
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#include "qwt_clipper.h"
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#include "qwt_color_map.h"
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#include "qwt_scale_map.h"
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#include <qwidget.h>
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#include <qframe.h>
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#include <qrect.h>
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#include <qpainter.h>
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#include <qpalette.h>
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#include <qpaintdevice.h>
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#include <qpainterpath.h>
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#include <qpixmap.h>
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#include <qstyle.h>
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#include <qtextdocument.h>
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#include <qabstracttextdocumentlayout.h>
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#include <qstyleoption.h>
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#include <qpaintengine.h>
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#include <qapplication.h>
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#if QT_VERSION >= 0x060000
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#include <qscreen.h>
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#else
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#include <qdesktopwidget.h>
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#endif
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#if QT_VERSION < 0x050000
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#ifdef Q_WS_X11
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#include <qx11info_x11.h>
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#endif
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#endif
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#include <cstring>
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bool QwtPainter::m_polylineSplitting = true;
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bool QwtPainter::m_roundingAlignment = true;
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static inline bool qwtIsRasterPaintEngineBuggy()
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{
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#if 0
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static int isBuggy = -1;
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if ( isBuggy < 0 )
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{
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// auto detect bug of the raster paint engine,
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// fixed with: https://codereview.qt-project.org/#/c/99456/
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QImage image( 2, 3, QImage::Format_ARGB32 );
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image.fill( 0u );
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QPolygonF p;
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p += QPointF(0, 1);
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p += QPointF(0, 0);
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p += QPointF(1, 0 );
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p += QPointF(1, 2 );
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QPainter painter( &image );
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painter.drawPolyline( p );
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painter.end();
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isBuggy = ( image.pixel( 1, 1 ) == 0 ) ? 1 : 0;
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}
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return isBuggy == 1;
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#endif
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#if QT_VERSION < 0x050000
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return true;
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#elif QT_VERSION < 0x050100
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return false;
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#elif QT_VERSION < 0x050400
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return true;
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#else
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return false;
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#endif
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}
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static inline bool qwtIsClippingNeeded(
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const QPainter* painter, QRectF& clipRect )
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{
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bool doClipping = false;
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const QPaintEngine* pe = painter->paintEngine();
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if ( pe && pe->type() == QPaintEngine::SVG )
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{
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// The SVG paint engine ignores any clipping,
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if ( painter->hasClipping() )
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{
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doClipping = true;
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clipRect = painter->clipRegion().boundingRect();
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}
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}
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return doClipping;
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}
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template< class T >
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static inline void qwtDrawPolyline( QPainter* painter,
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const T* points, int pointCount, bool polylineSplitting )
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{
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bool doSplit = false;
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if ( polylineSplitting )
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{
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const QPaintEngine* pe = painter->paintEngine();
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if ( pe && pe->type() == QPaintEngine::Raster )
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{
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/*
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Raster paint engine is much faster when splitting
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the polygon, but of course we might see some issues where
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the pieces are joining
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*/
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doSplit = true;
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}
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}
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if ( doSplit )
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{
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QPen pen = painter->pen();
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const int splitSize = 6;
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if ( pen.width() <= 1 && pen.isSolid() && qwtIsRasterPaintEngineBuggy()
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&& !( painter->renderHints() & QPainter::Antialiasing ) )
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{
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int k = 0;
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for ( int i = k + 1; i < pointCount; i++ )
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{
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const QPointF& p1 = points[i - 1];
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const QPointF& p2 = points[i];
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const bool isBad = ( qAbs( p2.y() - p1.y() ) <= 1 )
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&& qAbs( p2.x() - p1.x() ) <= 1;
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if ( isBad || ( i - k >= splitSize ) )
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{
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painter->drawPolyline( points + k, i - k + 1 );
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k = i;
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}
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}
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painter->drawPolyline( points + k, pointCount - k );
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}
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else
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{
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for ( int i = 0; i < pointCount; i += splitSize )
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{
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const int n = qMin( splitSize + 1, pointCount - i );
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painter->drawPolyline( points + i, n );
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}
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}
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}
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else
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{
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painter->drawPolyline( points, pointCount );
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}
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}
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static inline QSize qwtScreenResolution()
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{
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static QSize screenResolution;
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if ( !screenResolution.isValid() )
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{
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/*
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We might have screens with different resolutions. TODO ...
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*/
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#if QT_VERSION >= 0x060000
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QScreen* screen = QGuiApplication::primaryScreen();
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if ( screen )
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{
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screenResolution.setWidth( screen->logicalDotsPerInchX() );
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screenResolution.setHeight( screen->logicalDotsPerInchY() );
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}
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#else
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QDesktopWidget* desktop = QApplication::desktop();
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if ( desktop )
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{
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screenResolution.setWidth( desktop->logicalDpiX() );
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screenResolution.setHeight( desktop->logicalDpiY() );
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}
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#endif
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}
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return screenResolution;
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}
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static inline void qwtUnscaleFont( QPainter* painter )
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{
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if ( painter->font().pixelSize() >= 0 )
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return;
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const QSize screenResolution = qwtScreenResolution();
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const QPaintDevice* pd = painter->device();
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if ( pd->logicalDpiX() != screenResolution.width() ||
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pd->logicalDpiY() != screenResolution.height() )
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{
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QFont pixelFont = QwtPainter::scaledFont( painter->font() );
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pixelFont.setPixelSize( QFontInfo( pixelFont ).pixelSize() );
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painter->setFont( pixelFont );
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}
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}
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/*!
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Check is the application is running with the X11 graphics system
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that has some special capabilities that can be used for incremental
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painting to a widget.
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\return True, when the graphics system is X11
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*/
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bool QwtPainter::isX11GraphicsSystem()
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{
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/*
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The X11 paint engine has been removed with Qt 5.0, but
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reintroduced with Qt 5.10. It can be enabled with
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"export QT_XCB_NATIVE_PAINTING=1".
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*/
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static int onX11 = -1;
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if ( onX11 < 0 )
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{
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QPixmap pm( 1, 1 );
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QPainter painter( &pm );
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onX11 = ( painter.paintEngine()->type() == QPaintEngine::X11 ) ? 1 : 0;
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}
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return onX11 == 1;
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}
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/*!
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Check if the painter is using a paint engine, that aligns
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coordinates to integers. Today these are all paint engines
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beside QPaintEngine::Pdf and QPaintEngine::SVG.
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If we have an integer based paint engine it is also
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checked if the painter has a transformation matrix,
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that rotates or scales.
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\param painter Painter
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\return true, when the painter is aligning
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\sa setRoundingAlignment()
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*/
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bool QwtPainter::isAligning( const QPainter* painter )
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{
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if ( painter && painter->isActive() )
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{
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const QPaintEngine::Type type =
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painter->paintEngine()->type();
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if ( type >= QPaintEngine::User )
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{
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// we have no idea - better don't align
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return false;
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}
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switch ( type )
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{
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case QPaintEngine::Pdf:
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case QPaintEngine::SVG:
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#if 0
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case QPaintEngine::MacPrinter:
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#endif
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return false;
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default:
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break;
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}
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const QTransform& tr = painter->transform();
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if ( tr.isRotating() || tr.isScaling() )
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{
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// we might have to check translations too
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return false;
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}
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}
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return true;
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}
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/*!
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Enable whether coordinates should be rounded, before they are painted
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to a paint engine that floors to integer values. For other paint engines
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( PDF, SVG ) this flag has no effect.
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QwtPainter stores this flag only, the rounding itself is done in
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the painting code ( f.e the plot items ).
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The default setting is true.
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\sa roundingAlignment(), isAligning()
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*/
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void QwtPainter::setRoundingAlignment( bool enable )
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{
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m_roundingAlignment = enable;
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}
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/*!
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\brief En/Disable line splitting for the raster paint engine
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In some Qt versions the raster paint engine paints polylines of many points
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much faster when they are split in smaller chunks: f.e all supported Qt versions
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>= Qt 5.0 when drawing an antialiased polyline with a pen width >=2.
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Also the raster paint engine has a nasty bug in many versions ( Qt 4.8 - ... )
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for short lines ( https://codereview.qt-project.org/#/c/99456 ), that is worked
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around in this mode.
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The default setting is true.
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\sa polylineSplitting()
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*/
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void QwtPainter::setPolylineSplitting( bool enable )
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{
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m_polylineSplitting = enable;
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}
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//! Wrapper for QPainter::drawPath()
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void QwtPainter::drawPath( QPainter* painter, const QPainterPath& path )
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{
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painter->drawPath( path );
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}
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//! Wrapper for QPainter::drawRect()
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void QwtPainter::drawRect( QPainter* painter, qreal x, qreal y, qreal w, qreal h )
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{
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drawRect( painter, QRectF( x, y, w, h ) );
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}
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//! Wrapper for QPainter::drawRect()
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void QwtPainter::drawRect( QPainter* painter, const QRectF& rect )
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{
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const QRectF r = rect;
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QRectF clipRect;
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const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
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if ( deviceClipping )
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{
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if ( !clipRect.intersects( r ) )
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return;
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if ( !clipRect.contains( r ) )
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{
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fillRect( painter, r & clipRect, painter->brush() );
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painter->save();
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painter->setBrush( Qt::NoBrush );
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drawPolyline( painter, QPolygonF( r ) );
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painter->restore();
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return;
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}
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}
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painter->drawRect( r );
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}
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//! Wrapper for QPainter::fillRect()
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void QwtPainter::fillRect( QPainter* painter,
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const QRectF& rect, const QBrush& brush )
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{
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if ( !rect.isValid() )
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return;
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QRectF clipRect;
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const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
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/*
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Performance of Qt4 is horrible for a non trivial brush. Without
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clipping expect minutes or hours for repainting large rectangles
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(might result from zooming)
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*/
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if ( deviceClipping )
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clipRect &= painter->window();
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else
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clipRect = painter->window();
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if ( painter->hasClipping() )
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clipRect &= painter->clipRegion().boundingRect();
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QRectF r = rect;
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if ( deviceClipping )
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r = r.intersected( clipRect );
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if ( r.isValid() )
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painter->fillRect( r, brush );
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}
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//! Wrapper for QPainter::drawPie()
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void QwtPainter::drawPie( QPainter* painter, const QRectF& rect,
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int a, int alen )
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{
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QRectF clipRect;
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const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
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if ( deviceClipping && !clipRect.contains( rect ) )
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return;
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painter->drawPie( rect, a, alen );
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}
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//! Wrapper for QPainter::drawEllipse()
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void QwtPainter::drawEllipse( QPainter* painter, const QRectF& rect )
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{
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QRectF clipRect;
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const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
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if ( deviceClipping && !clipRect.contains( rect ) )
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return;
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painter->drawEllipse( rect );
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}
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//! Wrapper for QPainter::drawText()
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void QwtPainter::drawText( QPainter* painter,
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qreal x, qreal y, const QString& text )
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{
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drawText( painter, QPointF( x, y ), text );
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}
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//! Wrapper for QPainter::drawText()
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void QwtPainter::drawText( QPainter* painter, const QPointF& pos,
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const QString& text )
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{
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QRectF clipRect;
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const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
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if ( deviceClipping && !clipRect.contains( pos ) )
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return;
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painter->save();
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qwtUnscaleFont( painter );
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painter->drawText( pos, text );
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painter->restore();
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}
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//! Wrapper for QPainter::drawText()
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void QwtPainter::drawText( QPainter* painter,
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qreal x, qreal y, qreal w, qreal h,
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int flags, const QString& text )
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{
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drawText( painter, QRectF( x, y, w, h ), flags, text );
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}
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//! Wrapper for QPainter::drawText()
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void QwtPainter::drawText( QPainter* painter, const QRectF& rect,
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int flags, const QString& text )
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{
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painter->save();
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qwtUnscaleFont( painter );
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painter->drawText( rect, flags, text );
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painter->restore();
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}
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#ifndef QT_NO_RICHTEXT
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/*!
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Draw a text document into a rectangle
|
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\param painter Painter
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\param rect Target rectangle
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\param flags Alignments/Text flags, see QPainter::drawText()
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\param text Text document
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*/
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void QwtPainter::drawSimpleRichText( QPainter* painter, const QRectF& rect,
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int flags, const QTextDocument& text )
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{
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QTextDocument* txt = text.clone();
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painter->save();
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QRectF unscaledRect = rect;
|
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if ( painter->font().pixelSize() < 0 )
|
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{
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const QSize res = qwtScreenResolution();
|
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const QPaintDevice* pd = painter->device();
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if ( pd->logicalDpiX() != res.width() ||
|
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pd->logicalDpiY() != res.height() )
|
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{
|
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QTransform transform;
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transform.scale( res.width() / qreal( pd->logicalDpiX() ),
|
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res.height() / qreal( pd->logicalDpiY() ) );
|
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painter->setWorldTransform( transform, true );
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unscaledRect = transform.inverted().mapRect(rect);
|
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}
|
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}
|
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|
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txt->setDefaultFont( painter->font() );
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txt->setPageSize( QSizeF( unscaledRect.width(), QWIDGETSIZE_MAX ) );
|
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|
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QAbstractTextDocumentLayout* layout = txt->documentLayout();
|
||
|
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const qreal height = layout->documentSize().height();
|
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qreal y = unscaledRect.y();
|
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if ( flags & Qt::AlignBottom )
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y += ( unscaledRect.height() - height );
|
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else if ( flags & Qt::AlignVCenter )
|
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y += ( unscaledRect.height() - height ) / 2;
|
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|
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QAbstractTextDocumentLayout::PaintContext context;
|
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context.palette.setColor( QPalette::Text, painter->pen().color() );
|
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painter->translate( unscaledRect.x(), y );
|
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layout->draw( painter, context );
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|
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painter->restore();
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delete txt;
|
||
}
|
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|
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#endif // !QT_NO_RICHTEXT
|
||
|
||
|
||
//! Wrapper for QPainter::drawLine()
|
||
void QwtPainter::drawLine( QPainter* painter,
|
||
const QPointF& p1, const QPointF& p2 )
|
||
{
|
||
QRectF clipRect;
|
||
const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
|
||
|
||
if ( deviceClipping &&
|
||
!( clipRect.contains( p1 ) && clipRect.contains( p2 ) ) )
|
||
{
|
||
QPolygonF polygon;
|
||
polygon += p1;
|
||
polygon += p2;
|
||
drawPolyline( painter, polygon );
|
||
return;
|
||
}
|
||
|
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painter->drawLine( p1, p2 );
|
||
}
|
||
|
||
//! Wrapper for QPainter::drawPolygon()
|
||
void QwtPainter::drawPolygon( QPainter* painter, const QPolygonF& polygon )
|
||
{
|
||
QRectF clipRect;
|
||
const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
|
||
|
||
if ( deviceClipping )
|
||
{
|
||
painter->drawPolygon(
|
||
QwtClipper::clippedPolygonF( clipRect, polygon, true ) );
|
||
}
|
||
else
|
||
{
|
||
painter->drawPolygon( polygon );
|
||
}
|
||
}
|
||
|
||
//! Wrapper for QPainter::drawPolyline()
|
||
void QwtPainter::drawPolyline( QPainter* painter, const QPolygonF& polygon )
|
||
{
|
||
QRectF clipRect;
|
||
const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
|
||
|
||
if ( deviceClipping )
|
||
{
|
||
const QPolygonF cpa = QwtClipper::clippedPolygonF( clipRect, polygon );
|
||
|
||
qwtDrawPolyline< QPointF >( painter,
|
||
cpa.constData(), cpa.size(), m_polylineSplitting );
|
||
}
|
||
else
|
||
{
|
||
qwtDrawPolyline< QPointF >( painter,
|
||
polygon.constData(), polygon.size(), m_polylineSplitting );
|
||
}
|
||
}
|
||
|
||
//! Wrapper for QPainter::drawPolyline()
|
||
void QwtPainter::drawPolyline( QPainter* painter,
|
||
const QPointF* points, int pointCount )
|
||
{
|
||
QRectF clipRect;
|
||
const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
|
||
|
||
if ( deviceClipping )
|
||
{
|
||
QPolygonF polygon( pointCount );
|
||
std::memcpy( polygon.data(), points, pointCount * sizeof( QPointF ) );
|
||
|
||
QwtClipper::clipPolygonF( clipRect, polygon );
|
||
qwtDrawPolyline< QPointF >( painter,
|
||
polygon.constData(), polygon.size(), m_polylineSplitting );
|
||
}
|
||
else
|
||
{
|
||
qwtDrawPolyline< QPointF >( painter, points, pointCount, m_polylineSplitting );
|
||
}
|
||
}
|
||
|
||
//! Wrapper for QPainter::drawPolygon()
|
||
void QwtPainter::drawPolygon( QPainter* painter, const QPolygon& polygon )
|
||
{
|
||
QRectF clipRect;
|
||
const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
|
||
|
||
if ( deviceClipping )
|
||
{
|
||
painter->drawPolygon(
|
||
QwtClipper::clippedPolygon( clipRect, polygon, true ) );
|
||
}
|
||
else
|
||
{
|
||
painter->drawPolygon( polygon );
|
||
}
|
||
}
|
||
|
||
//! Wrapper for QPainter::drawPolyline()
|
||
void QwtPainter::drawPolyline( QPainter* painter, const QPolygon& polygon )
|
||
{
|
||
QRectF clipRect;
|
||
const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
|
||
|
||
if ( deviceClipping )
|
||
{
|
||
const QPolygon cpa = QwtClipper::clippedPolygon( clipRect, polygon );
|
||
|
||
qwtDrawPolyline< QPoint >( painter,
|
||
cpa.constData(), cpa.size(), m_polylineSplitting );
|
||
}
|
||
else
|
||
{
|
||
qwtDrawPolyline< QPoint >( painter,
|
||
polygon.constData(), polygon.size(), m_polylineSplitting );
|
||
}
|
||
}
|
||
|
||
//! Wrapper for QPainter::drawPolyline()
|
||
void QwtPainter::drawPolyline( QPainter* painter,
|
||
const QPoint* points, int pointCount )
|
||
{
|
||
QRectF clipRect;
|
||
const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
|
||
|
||
if ( deviceClipping )
|
||
{
|
||
QPolygon polygon( pointCount );
|
||
std::memcpy( polygon.data(), points, pointCount * sizeof( QPoint ) );
|
||
|
||
QwtClipper::clipPolygon( clipRect, polygon );
|
||
qwtDrawPolyline< QPoint >( painter,
|
||
polygon.constData(), polygon.size(), m_polylineSplitting );
|
||
}
|
||
else
|
||
{
|
||
qwtDrawPolyline< QPoint >( painter, points, pointCount, m_polylineSplitting );
|
||
}
|
||
}
|
||
|
||
//! Wrapper for QPainter::drawPoint()
|
||
void QwtPainter::drawPoint( QPainter* painter, const QPointF& pos )
|
||
{
|
||
QRectF clipRect;
|
||
const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
|
||
|
||
if ( deviceClipping && !clipRect.contains( pos ) )
|
||
return;
|
||
|
||
painter->drawPoint( pos );
|
||
}
|
||
|
||
//! Wrapper for QPainter::drawPoint()
|
||
void QwtPainter::drawPoint( QPainter* painter, const QPoint& pos )
|
||
{
|
||
QRectF clipRect;
|
||
const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
|
||
|
||
if ( deviceClipping )
|
||
{
|
||
const int minX = qwtCeil( clipRect.left() );
|
||
const int maxX = qwtFloor( clipRect.right() );
|
||
const int minY = qwtCeil( clipRect.top() );
|
||
const int maxY = qwtFloor( clipRect.bottom() );
|
||
|
||
if ( pos.x() < minX || pos.x() > maxX
|
||
|| pos.y() < minY || pos.y() > maxY )
|
||
{
|
||
return;
|
||
}
|
||
}
|
||
|
||
painter->drawPoint( pos );
|
||
}
|
||
|
||
//! Wrapper for QPainter::drawPoints()
|
||
void QwtPainter::drawPoints( QPainter* painter,
|
||
const QPoint* points, int pointCount )
|
||
{
|
||
QRectF clipRect;
|
||
const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
|
||
|
||
if ( deviceClipping )
|
||
{
|
||
const int minX = qwtCeil( clipRect.left() );
|
||
const int maxX = qwtFloor( clipRect.right() );
|
||
const int minY = qwtCeil( clipRect.top() );
|
||
const int maxY = qwtFloor( clipRect.bottom() );
|
||
|
||
const QRect r( minX, minY, maxX - minX, maxY - minY );
|
||
|
||
QPolygon clippedPolygon( pointCount );
|
||
QPoint* clippedData = clippedPolygon.data();
|
||
|
||
int numClippedPoints = 0;
|
||
for ( int i = 0; i < pointCount; i++ )
|
||
{
|
||
if ( r.contains( points[i] ) )
|
||
clippedData[ numClippedPoints++ ] = points[i];
|
||
}
|
||
painter->drawPoints( clippedData, numClippedPoints );
|
||
}
|
||
else
|
||
{
|
||
painter->drawPoints( points, pointCount );
|
||
}
|
||
}
|
||
|
||
//! Wrapper for QPainter::drawPoints()
|
||
void QwtPainter::drawPoints( QPainter* painter,
|
||
const QPointF* points, int pointCount )
|
||
{
|
||
QRectF clipRect;
|
||
const bool deviceClipping = qwtIsClippingNeeded( painter, clipRect );
|
||
|
||
if ( deviceClipping )
|
||
{
|
||
QPolygonF clippedPolygon( pointCount );
|
||
QPointF* clippedData = clippedPolygon.data();
|
||
|
||
int numClippedPoints = 0;
|
||
for ( int i = 0; i < pointCount; i++ )
|
||
{
|
||
if ( clipRect.contains( points[i] ) )
|
||
clippedData[ numClippedPoints++ ] = points[i];
|
||
}
|
||
painter->drawPoints( clippedData, numClippedPoints );
|
||
}
|
||
else
|
||
{
|
||
painter->drawPoints( points, pointCount );
|
||
}
|
||
}
|
||
|
||
//! Wrapper for QPainter::drawImage()
|
||
void QwtPainter::drawImage( QPainter* painter,
|
||
const QRectF& rect, const QImage& image )
|
||
{
|
||
const QRect alignedRect = rect.toAlignedRect();
|
||
|
||
if ( alignedRect != rect )
|
||
{
|
||
const QRectF clipRect = rect.adjusted( 0.0, 0.0, -1.0, -1.0 );
|
||
|
||
painter->save();
|
||
painter->setClipRect( clipRect, Qt::IntersectClip );
|
||
painter->drawImage( alignedRect, image );
|
||
painter->restore();
|
||
}
|
||
else
|
||
{
|
||
painter->drawImage( alignedRect, image );
|
||
}
|
||
}
|
||
|
||
//! Wrapper for QPainter::drawPixmap()
|
||
void QwtPainter::drawPixmap( QPainter* painter,
|
||
const QRectF& rect, const QPixmap& pixmap )
|
||
{
|
||
const QRect alignedRect = rect.toAlignedRect();
|
||
|
||
if ( alignedRect != rect )
|
||
{
|
||
const QRectF clipRect = rect.adjusted( 0.0, 0.0, -1.0, -1.0 );
|
||
|
||
painter->save();
|
||
painter->setClipRect( clipRect, Qt::IntersectClip );
|
||
painter->drawPixmap( alignedRect, pixmap );
|
||
painter->restore();
|
||
}
|
||
else
|
||
{
|
||
painter->drawPixmap( alignedRect, pixmap );
|
||
}
|
||
}
|
||
|
||
//! Draw a focus rectangle on a widget using its style.
|
||
void QwtPainter::drawFocusRect( QPainter* painter, const QWidget* widget )
|
||
{
|
||
drawFocusRect( painter, widget, widget->rect() );
|
||
}
|
||
|
||
//! Draw a focus rectangle on a widget using its style.
|
||
void QwtPainter::drawFocusRect( QPainter* painter, const QWidget* widget,
|
||
const QRect& rect )
|
||
{
|
||
QStyleOptionFocusRect opt;
|
||
opt.initFrom( widget );
|
||
opt.rect = rect;
|
||
opt.state |= QStyle::State_HasFocus;
|
||
opt.backgroundColor = widget->palette().color( widget->backgroundRole() );
|
||
|
||
widget->style()->drawPrimitive(
|
||
QStyle::PE_FrameFocusRect, &opt, painter, widget );
|
||
}
|
||
|
||
/*!
|
||
Draw a round frame
|
||
|
||
\param painter Painter
|
||
\param rect Frame rectangle
|
||
\param palette QPalette::WindowText is used for plain borders
|
||
QPalette::Dark and QPalette::Light for raised
|
||
or sunken borders
|
||
\param lineWidth Line width
|
||
\param frameStyle bitwise OR´ed value of QFrame::Shape and QFrame::Shadow
|
||
*/
|
||
void QwtPainter::drawRoundFrame( QPainter* painter,
|
||
const QRectF& rect, const QPalette& palette,
|
||
int lineWidth, int frameStyle )
|
||
{
|
||
enum Style
|
||
{
|
||
Plain,
|
||
Sunken,
|
||
Raised
|
||
};
|
||
|
||
Style style = Plain;
|
||
if ( (frameStyle& QFrame::Sunken) == QFrame::Sunken )
|
||
style = Sunken;
|
||
else if ( (frameStyle& QFrame::Raised) == QFrame::Raised )
|
||
style = Raised;
|
||
|
||
const qreal lw2 = 0.5 * lineWidth;
|
||
QRectF r = rect.adjusted( lw2, lw2, -lw2, -lw2 );
|
||
|
||
QBrush brush;
|
||
|
||
if ( style != Plain )
|
||
{
|
||
QColor c1 = palette.color( QPalette::Light );
|
||
QColor c2 = palette.color( QPalette::Dark );
|
||
|
||
if ( style == Sunken )
|
||
qSwap( c1, c2 );
|
||
|
||
QLinearGradient gradient( r.topLeft(), r.bottomRight() );
|
||
gradient.setColorAt( 0.0, c1 );
|
||
#if 0
|
||
gradient.setColorAt( 0.3, c1 );
|
||
gradient.setColorAt( 0.7, c2 );
|
||
#endif
|
||
gradient.setColorAt( 1.0, c2 );
|
||
|
||
brush = QBrush( gradient );
|
||
}
|
||
else // Plain
|
||
{
|
||
brush = palette.brush( QPalette::WindowText );
|
||
}
|
||
|
||
painter->save();
|
||
|
||
painter->setPen( QPen( brush, lineWidth ) );
|
||
painter->setBrush( Qt::NoBrush );
|
||
|
||
painter->drawEllipse( r );
|
||
|
||
painter->restore();
|
||
}
|
||
|
||
/*!
|
||
Draw a rectangular frame
|
||
|
||
\param painter Painter
|
||
\param rect Frame rectangle
|
||
\param palette Palette
|
||
\param foregroundRole Foreground role used for QFrame::Plain
|
||
\param frameWidth Frame width
|
||
\param midLineWidth Used for QFrame::Box
|
||
\param frameStyle bitwise OR´ed value of QFrame::Shape and QFrame::Shadow
|
||
*/
|
||
void QwtPainter::drawFrame( QPainter* painter, const QRectF& rect,
|
||
const QPalette& palette, QPalette::ColorRole foregroundRole,
|
||
int frameWidth, int midLineWidth, int frameStyle )
|
||
{
|
||
if ( frameWidth <= 0 || rect.isEmpty() )
|
||
return;
|
||
|
||
const int shadow = frameStyle & QFrame::Shadow_Mask;
|
||
|
||
painter->save();
|
||
|
||
if ( shadow == QFrame::Plain )
|
||
{
|
||
const QRectF outerRect = rect.adjusted( 0.0, 0.0, -1.0, -1.0 );
|
||
const QRectF innerRect = outerRect.adjusted(
|
||
frameWidth, frameWidth, -frameWidth, -frameWidth );
|
||
|
||
QPainterPath path;
|
||
path.addRect( outerRect );
|
||
path.addRect( innerRect );
|
||
|
||
painter->setPen( Qt::NoPen );
|
||
painter->setBrush( palette.color( foregroundRole ) );
|
||
|
||
painter->drawPath( path );
|
||
}
|
||
else
|
||
{
|
||
const int shape = frameStyle & QFrame::Shape_Mask;
|
||
|
||
if ( shape == QFrame::Box )
|
||
{
|
||
const QRectF outerRect = rect.adjusted( 0.0, 0.0, -1.0, -1.0 );
|
||
const QRectF midRect1 = outerRect.adjusted(
|
||
frameWidth, frameWidth, -frameWidth, -frameWidth );
|
||
const QRectF midRect2 = midRect1.adjusted(
|
||
midLineWidth, midLineWidth, -midLineWidth, -midLineWidth );
|
||
|
||
const QRectF innerRect = midRect2.adjusted(
|
||
frameWidth, frameWidth, -frameWidth, -frameWidth );
|
||
|
||
QPainterPath path1;
|
||
path1.moveTo( outerRect.bottomLeft() );
|
||
path1.lineTo( outerRect.topLeft() );
|
||
path1.lineTo( outerRect.topRight() );
|
||
path1.lineTo( midRect1.topRight() );
|
||
path1.lineTo( midRect1.topLeft() );
|
||
path1.lineTo( midRect1.bottomLeft() );
|
||
|
||
QPainterPath path2;
|
||
path2.moveTo( outerRect.bottomLeft() );
|
||
path2.lineTo( outerRect.bottomRight() );
|
||
path2.lineTo( outerRect.topRight() );
|
||
path2.lineTo( midRect1.topRight() );
|
||
path2.lineTo( midRect1.bottomRight() );
|
||
path2.lineTo( midRect1.bottomLeft() );
|
||
|
||
QPainterPath path3;
|
||
path3.moveTo( midRect2.bottomLeft() );
|
||
path3.lineTo( midRect2.topLeft() );
|
||
path3.lineTo( midRect2.topRight() );
|
||
path3.lineTo( innerRect.topRight() );
|
||
path3.lineTo( innerRect.topLeft() );
|
||
path3.lineTo( innerRect.bottomLeft() );
|
||
|
||
QPainterPath path4;
|
||
path4.moveTo( midRect2.bottomLeft() );
|
||
path4.lineTo( midRect2.bottomRight() );
|
||
path4.lineTo( midRect2.topRight() );
|
||
path4.lineTo( innerRect.topRight() );
|
||
path4.lineTo( innerRect.bottomRight() );
|
||
path4.lineTo( innerRect.bottomLeft() );
|
||
|
||
QPainterPath path5;
|
||
path5.addRect( midRect1 );
|
||
path5.addRect( midRect2 );
|
||
|
||
painter->setPen( Qt::NoPen );
|
||
|
||
QBrush brush1 = palette.dark().color();
|
||
QBrush brush2 = palette.light().color();
|
||
|
||
if ( shadow == QFrame::Raised )
|
||
qSwap( brush1, brush2 );
|
||
|
||
painter->setBrush( brush1 );
|
||
painter->drawPath( path1 );
|
||
painter->drawPath( path4 );
|
||
|
||
painter->setBrush( brush2 );
|
||
painter->drawPath( path2 );
|
||
painter->drawPath( path3 );
|
||
|
||
painter->setBrush( palette.mid() );
|
||
painter->drawPath( path5 );
|
||
}
|
||
else
|
||
{
|
||
const QRectF outerRect = rect.adjusted( 0.0, 0.0, -1.0, -1.0 );
|
||
const QRectF innerRect = outerRect.adjusted(
|
||
frameWidth - 1.0, frameWidth - 1.0,
|
||
-( frameWidth - 1.0 ), -( frameWidth - 1.0 ) );
|
||
|
||
QPainterPath path1;
|
||
path1.moveTo( outerRect.bottomLeft() );
|
||
path1.lineTo( outerRect.topLeft() );
|
||
path1.lineTo( outerRect.topRight() );
|
||
path1.lineTo( innerRect.topRight() );
|
||
path1.lineTo( innerRect.topLeft() );
|
||
path1.lineTo( innerRect.bottomLeft() );
|
||
|
||
|
||
QPainterPath path2;
|
||
path2.moveTo( outerRect.bottomLeft() );
|
||
path2.lineTo( outerRect.bottomRight() );
|
||
path2.lineTo( outerRect.topRight() );
|
||
path2.lineTo( innerRect.topRight() );
|
||
path2.lineTo( innerRect.bottomRight() );
|
||
path2.lineTo( innerRect.bottomLeft() );
|
||
|
||
painter->setPen( Qt::NoPen );
|
||
|
||
QBrush brush1 = palette.dark().color();
|
||
QBrush brush2 = palette.light().color();
|
||
|
||
if ( shadow == QFrame::Raised )
|
||
qSwap( brush1, brush2 );
|
||
|
||
painter->setBrush( brush1 );
|
||
painter->drawPath( path1 );
|
||
|
||
painter->setBrush( brush2 );
|
||
painter->drawPath( path2 );
|
||
}
|
||
|
||
}
|
||
|
||
painter->restore();
|
||
}
|
||
|
||
/*!
|
||
Draw a rectangular frame with rounded borders
|
||
|
||
\param painter Painter
|
||
\param rect Frame rectangle
|
||
\param xRadius x-radius of the ellipses defining the corners
|
||
\param yRadius y-radius of the ellipses defining the corners
|
||
\param palette QPalette::WindowText is used for plain borders
|
||
QPalette::Dark and QPalette::Light for raised
|
||
or sunken borders
|
||
\param lineWidth Line width
|
||
\param frameStyle bitwise OR´ed value of QFrame::Shape and QFrame::Shadow
|
||
*/
|
||
|
||
void QwtPainter::drawRoundedFrame( QPainter* painter,
|
||
const QRectF& rect, qreal xRadius, qreal yRadius,
|
||
const QPalette& palette, int lineWidth, int frameStyle )
|
||
{
|
||
painter->save();
|
||
painter->setRenderHint( QPainter::Antialiasing, true );
|
||
painter->setBrush( Qt::NoBrush );
|
||
|
||
qreal lw2 = lineWidth * 0.5;
|
||
QRectF innerRect = rect.adjusted( lw2, lw2, -lw2, -lw2 );
|
||
|
||
QPainterPath path;
|
||
path.addRoundedRect( innerRect, xRadius, yRadius );
|
||
|
||
enum Style
|
||
{
|
||
Plain,
|
||
Sunken,
|
||
Raised
|
||
};
|
||
|
||
Style style = Plain;
|
||
if ( (frameStyle& QFrame::Sunken) == QFrame::Sunken )
|
||
style = Sunken;
|
||
else if ( (frameStyle& QFrame::Raised) == QFrame::Raised )
|
||
style = Raised;
|
||
|
||
if ( style != Plain && path.elementCount() == 17 )
|
||
{
|
||
// move + 4 * ( cubicTo + lineTo )
|
||
QPainterPath pathList[8];
|
||
|
||
for ( int i = 0; i < 4; i++ )
|
||
{
|
||
const int j = i * 4 + 1;
|
||
|
||
pathList[ 2 * i ].moveTo(
|
||
path.elementAt(j - 1).x, path.elementAt( j - 1 ).y
|
||
);
|
||
|
||
pathList[ 2 * i ].cubicTo(
|
||
path.elementAt(j + 0).x, path.elementAt(j + 0).y,
|
||
path.elementAt(j + 1).x, path.elementAt(j + 1).y,
|
||
path.elementAt(j + 2).x, path.elementAt(j + 2).y );
|
||
|
||
pathList[ 2 * i + 1 ].moveTo(
|
||
path.elementAt(j + 2).x, path.elementAt(j + 2).y
|
||
);
|
||
pathList[ 2 * i + 1 ].lineTo(
|
||
path.elementAt(j + 3).x, path.elementAt(j + 3).y
|
||
);
|
||
}
|
||
|
||
QColor c1( palette.color( QPalette::Dark ) );
|
||
QColor c2( palette.color( QPalette::Light ) );
|
||
|
||
if ( style == Raised )
|
||
qSwap( c1, c2 );
|
||
|
||
for ( int i = 0; i < 4; i++ )
|
||
{
|
||
const QRectF r = pathList[2 * i].controlPointRect();
|
||
|
||
QPen arcPen;
|
||
arcPen.setCapStyle( Qt::FlatCap );
|
||
arcPen.setWidth( lineWidth );
|
||
|
||
QPen linePen;
|
||
linePen.setCapStyle( Qt::FlatCap );
|
||
linePen.setWidth( lineWidth );
|
||
|
||
switch( i )
|
||
{
|
||
case 0:
|
||
{
|
||
arcPen.setColor( c1 );
|
||
linePen.setColor( c1 );
|
||
break;
|
||
}
|
||
case 1:
|
||
{
|
||
QLinearGradient gradient;
|
||
gradient.setStart( r.topLeft() );
|
||
gradient.setFinalStop( r.bottomRight() );
|
||
gradient.setColorAt( 0.0, c1 );
|
||
gradient.setColorAt( 1.0, c2 );
|
||
|
||
arcPen.setBrush( gradient );
|
||
linePen.setColor( c2 );
|
||
break;
|
||
}
|
||
case 2:
|
||
{
|
||
arcPen.setColor( c2 );
|
||
linePen.setColor( c2 );
|
||
break;
|
||
}
|
||
case 3:
|
||
{
|
||
QLinearGradient gradient;
|
||
|
||
gradient.setStart( r.bottomRight() );
|
||
gradient.setFinalStop( r.topLeft() );
|
||
gradient.setColorAt( 0.0, c2 );
|
||
gradient.setColorAt( 1.0, c1 );
|
||
|
||
arcPen.setBrush( gradient );
|
||
linePen.setColor( c1 );
|
||
break;
|
||
}
|
||
}
|
||
|
||
|
||
painter->setPen( arcPen );
|
||
painter->drawPath( pathList[ 2 * i] );
|
||
|
||
painter->setPen( linePen );
|
||
painter->drawPath( pathList[ 2 * i + 1] );
|
||
}
|
||
}
|
||
else
|
||
{
|
||
QPen pen( palette.color( QPalette::WindowText ), lineWidth );
|
||
painter->setPen( pen );
|
||
painter->drawPath( path );
|
||
}
|
||
|
||
painter->restore();
|
||
}
|
||
|
||
/*!
|
||
Draw a color bar into a rectangle
|
||
|
||
\param painter Painter
|
||
\param colorMap Color map
|
||
\param interval Value range
|
||
\param scaleMap Scale map
|
||
\param orientation Orientation
|
||
\param rect Target rectangle
|
||
*/
|
||
void QwtPainter::drawColorBar( QPainter* painter,
|
||
const QwtColorMap& colorMap, const QwtInterval& interval,
|
||
const QwtScaleMap& scaleMap, Qt::Orientation orientation,
|
||
const QRectF& rect )
|
||
{
|
||
QVector< QRgb > colorTable;
|
||
if ( colorMap.format() == QwtColorMap::Indexed )
|
||
colorTable = colorMap.colorTable256();
|
||
|
||
QColor c;
|
||
|
||
const QRect devRect = rect.toAlignedRect();
|
||
|
||
/*
|
||
We paint to a pixmap first to have something scalable for printing
|
||
( f.e. in a Pdf document )
|
||
*/
|
||
|
||
QPixmap pixmap( devRect.size() );
|
||
pixmap.fill( Qt::transparent );
|
||
|
||
QPainter pmPainter( &pixmap );
|
||
pmPainter.translate( -devRect.x(), -devRect.y() );
|
||
|
||
if ( orientation == Qt::Horizontal )
|
||
{
|
||
QwtScaleMap sMap = scaleMap;
|
||
sMap.setPaintInterval( rect.left(), rect.right() );
|
||
|
||
for ( int x = devRect.left(); x <= devRect.right(); x++ )
|
||
{
|
||
const double value = sMap.invTransform( x );
|
||
|
||
if ( colorMap.format() == QwtColorMap::RGB )
|
||
c.setRgba( colorMap.rgb( interval, value ) );
|
||
else
|
||
c = colorTable[colorMap.colorIndex( 256, interval, value )];
|
||
|
||
pmPainter.setPen( c );
|
||
pmPainter.drawLine( x, devRect.top(), x, devRect.bottom() );
|
||
}
|
||
}
|
||
else // Vertical
|
||
{
|
||
QwtScaleMap sMap = scaleMap;
|
||
sMap.setPaintInterval( rect.bottom(), rect.top() );
|
||
|
||
for ( int y = devRect.top(); y <= devRect.bottom(); y++ )
|
||
{
|
||
const double value = sMap.invTransform( y );
|
||
|
||
if ( colorMap.format() == QwtColorMap::RGB )
|
||
c.setRgba( colorMap.rgb( interval, value ) );
|
||
else
|
||
c = colorTable[colorMap.colorIndex( 256, interval, value )];
|
||
|
||
pmPainter.setPen( c );
|
||
pmPainter.drawLine( devRect.left(), y, devRect.right(), y );
|
||
}
|
||
}
|
||
pmPainter.end();
|
||
|
||
drawPixmap( painter, rect, pixmap );
|
||
}
|
||
|
||
static inline void qwtFillRect( const QWidget* widget, QPainter* painter,
|
||
const QRect& rect, const QBrush& brush)
|
||
{
|
||
if ( brush.style() == Qt::TexturePattern )
|
||
{
|
||
painter->save();
|
||
|
||
painter->setClipRect( rect );
|
||
painter->drawTiledPixmap(rect, brush.texture(), rect.topLeft() );
|
||
|
||
painter->restore();
|
||
}
|
||
else if ( brush.gradient() )
|
||
{
|
||
painter->save();
|
||
|
||
painter->setClipRect( rect );
|
||
painter->fillRect(0, 0, widget->width(),
|
||
widget->height(), brush);
|
||
|
||
painter->restore();
|
||
}
|
||
else
|
||
{
|
||
painter->fillRect(rect, brush);
|
||
}
|
||
}
|
||
|
||
/*!
|
||
Fill a pixmap with the content of a widget
|
||
|
||
In Qt >= 5.0 QPixmap::fill() is a nop, in Qt 4.x it is buggy
|
||
for backgrounds with gradients. Thus fillPixmap() offers
|
||
an alternative implementation.
|
||
|
||
\param widget Widget
|
||
\param pixmap Pixmap to be filled
|
||
\param offset Offset
|
||
|
||
\sa QPixmap::fill()
|
||
*/
|
||
void QwtPainter::fillPixmap( const QWidget* widget,
|
||
QPixmap& pixmap, const QPoint& offset )
|
||
{
|
||
const QRect rect( offset, pixmap.size() );
|
||
|
||
QPainter painter( &pixmap );
|
||
painter.translate( -offset );
|
||
|
||
const QBrush autoFillBrush =
|
||
widget->palette().brush( widget->backgroundRole() );
|
||
|
||
if ( !( widget->autoFillBackground() && autoFillBrush.isOpaque() ) )
|
||
{
|
||
const QBrush bg = widget->palette().brush( QPalette::Window );
|
||
qwtFillRect( widget, &painter, rect, bg);
|
||
}
|
||
|
||
if ( widget->autoFillBackground() )
|
||
qwtFillRect( widget, &painter, rect, autoFillBrush);
|
||
|
||
if ( widget->testAttribute(Qt::WA_StyledBackground) )
|
||
{
|
||
painter.setClipRegion( rect );
|
||
|
||
QStyleOption opt;
|
||
opt.initFrom( widget );
|
||
widget->style()->drawPrimitive( QStyle::PE_Widget,
|
||
&opt, &painter, widget );
|
||
}
|
||
}
|
||
|
||
/*!
|
||
Fill rect with the background of a widget
|
||
|
||
\param painter Painter
|
||
\param rect Rectangle to be filled
|
||
\param widget Widget
|
||
|
||
\sa QStyle::PE_Widget, QWidget::backgroundRole()
|
||
*/
|
||
void QwtPainter::drawBackgound( QPainter* painter,
|
||
const QRectF& rect, const QWidget* widget )
|
||
{
|
||
if ( widget->testAttribute( Qt::WA_StyledBackground ) )
|
||
{
|
||
QStyleOption opt;
|
||
opt.initFrom( widget );
|
||
opt.rect = rect.toAlignedRect();
|
||
|
||
widget->style()->drawPrimitive(
|
||
QStyle::PE_Widget, &opt, painter, widget);
|
||
}
|
||
else
|
||
{
|
||
const QBrush brush =
|
||
widget->palette().brush( widget->backgroundRole() );
|
||
|
||
painter->fillRect( rect, brush );
|
||
}
|
||
}
|
||
|
||
/*!
|
||
Distance appropriate for drawing a subsequent character after text.
|
||
|
||
\param fontMetrics Font metrics
|
||
\param text Text
|
||
\return horizontal advance in pixels
|
||
*/
|
||
int QwtPainter::horizontalAdvance(
|
||
const QFontMetrics& fontMetrics, const QString& text )
|
||
{
|
||
#if QT_VERSION >= 0x050b00
|
||
return fontMetrics.horizontalAdvance( text );
|
||
#else
|
||
return fontMetrics.width( text );
|
||
#endif
|
||
|
||
}
|
||
|
||
/*!
|
||
Distance appropriate for drawing a subsequent character after text.
|
||
|
||
\param fontMetrics Font metrics
|
||
\param text Text
|
||
\return horizontal advance in pixels
|
||
*/
|
||
qreal QwtPainter::horizontalAdvance(
|
||
const QFontMetricsF& fontMetrics, const QString& text )
|
||
{
|
||
#if QT_VERSION >= 0x050b00
|
||
return fontMetrics.horizontalAdvance( text );
|
||
#else
|
||
return fontMetrics.width( text );
|
||
#endif
|
||
}
|
||
|
||
/*!
|
||
Distance appropriate for drawing a subsequent character after ch.
|
||
|
||
\param fontMetrics Font metrics
|
||
\param ch Character
|
||
\return horizontal advance in pixels
|
||
*/
|
||
int QwtPainter::horizontalAdvance(
|
||
const QFontMetrics& fontMetrics, QChar ch )
|
||
{
|
||
#if QT_VERSION >= 0x050b00
|
||
return fontMetrics.horizontalAdvance( ch );
|
||
#else
|
||
return fontMetrics.width( ch );
|
||
#endif
|
||
}
|
||
|
||
/*!
|
||
Distance appropriate for drawing a subsequent character after ch.
|
||
|
||
\param fontMetrics Font metrics
|
||
\param ch Character
|
||
\return horizontal advance in pixels
|
||
*/
|
||
qreal QwtPainter::horizontalAdvance(
|
||
const QFontMetricsF& fontMetrics, QChar ch )
|
||
{
|
||
#if QT_VERSION >= 0x050b00
|
||
return fontMetrics.horizontalAdvance( ch );
|
||
#else
|
||
return fontMetrics.width( ch );
|
||
#endif
|
||
}
|
||
|
||
/*!
|
||
Adjust the DPI value of font according to the DPI value of the paint device
|
||
|
||
\param font Unscaled font
|
||
\param paintDevice Paint device providing a DPI value. If paintDevice == null
|
||
the DPI value of the primary screen will be used
|
||
|
||
\return Font being adjusted to the DPI value of the paint device
|
||
*/
|
||
QFont QwtPainter::scaledFont( const QFont& font, const QPaintDevice* paintDevice )
|
||
{
|
||
if ( paintDevice == NULL )
|
||
{
|
||
#if QT_VERSION < 0x060000
|
||
paintDevice = QApplication::desktop();
|
||
#else
|
||
class PaintDevice : public QPaintDevice
|
||
{
|
||
virtual QPaintEngine* paintEngine() const QWT_OVERRIDE
|
||
{
|
||
return NULL;
|
||
}
|
||
|
||
virtual int metric( PaintDeviceMetric metric ) const QWT_OVERRIDE
|
||
{
|
||
if ( metric == PdmDpiY )
|
||
{
|
||
QScreen* screen = QGuiApplication::primaryScreen();
|
||
if ( screen )
|
||
{
|
||
return screen->logicalDotsPerInchY();
|
||
}
|
||
}
|
||
|
||
return QPaintDevice::metric( metric );
|
||
}
|
||
};
|
||
|
||
static PaintDevice dummyPaintDevice;
|
||
paintDevice = &dummyPaintDevice;
|
||
#endif
|
||
}
|
||
|
||
return QFont( font, const_cast< QPaintDevice* >( paintDevice ) );
|
||
}
|
||
|
||
/*!
|
||
\return Pixel ratio for a paint device
|
||
\param paintDevice Paint device
|
||
*/
|
||
qreal QwtPainter::devicePixelRatio( const QPaintDevice* paintDevice )
|
||
{
|
||
qreal pixelRatio = 0.0;
|
||
|
||
#if QT_VERSION >= 0x050100
|
||
if ( paintDevice )
|
||
{
|
||
#if QT_VERSION >= 0x050600
|
||
pixelRatio = paintDevice->devicePixelRatioF();
|
||
#else
|
||
pixelRatio = paintDevice->devicePixelRatio();
|
||
#endif
|
||
}
|
||
#else
|
||
Q_UNUSED( paintDevice )
|
||
#endif
|
||
|
||
#if QT_VERSION >= 0x050000
|
||
if ( pixelRatio == 0.0 && qApp )
|
||
pixelRatio = qApp->devicePixelRatio();
|
||
#endif
|
||
|
||
if ( pixelRatio == 0.0 )
|
||
pixelRatio = 1.0;
|
||
|
||
return pixelRatio;
|
||
}
|
||
|
||
/*!
|
||
\return A pixmap that can be used as backing store
|
||
|
||
\param widget Widget, for which the backingstore is intended
|
||
\param size Size of the pixmap
|
||
*/
|
||
QPixmap QwtPainter::backingStore( QWidget* widget, const QSize& size )
|
||
{
|
||
QPixmap pm;
|
||
|
||
#if QT_VERSION >= 0x050000
|
||
const qreal pixelRatio = QwtPainter::devicePixelRatio( widget );
|
||
|
||
pm = QPixmap( size * pixelRatio );
|
||
pm.setDevicePixelRatio( pixelRatio );
|
||
#else
|
||
pm = QPixmap( size );
|
||
#endif
|
||
|
||
#ifdef Q_WS_X11
|
||
if ( widget && isX11GraphicsSystem() )
|
||
{
|
||
if ( pm.x11Info().screen() != widget->x11Info().screen() )
|
||
pm.x11SetScreen( widget->x11Info().screen() );
|
||
}
|
||
#else
|
||
Q_UNUSED( widget )
|
||
#endif
|
||
|
||
return pm;
|
||
}
|