彻底改版2.0

third/3rd_qwt/qwt_plot_svgitem.cpp

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+/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
+ * Qwt Widget Library
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#include "qwt_plot_svgitem.h"
+#include "qwt_scale_map.h"
+#include "qwt_painter.h"
+#include <qpainter.h>
+#include <qsvgrenderer.h>
+
+class QwtPlotSvgItem::PrivateData
+{
+public:
+    PrivateData()
+    {
+    }
+
+    QRectF boundingRect;
+    QSvgRenderer renderer;
+};
+
+/*!
+   \brief Constructor
+
+   Sets the following item attributes:
+   - QwtPlotItem::AutoScale: true
+   - QwtPlotItem::Legend:    false
+
+   \param title Title
+*/
+QwtPlotSvgItem::QwtPlotSvgItem( const QString& title ):
+    QwtPlotItem( QwtText( title ) )
+{
+    init();
+}
+
+/*!
+   \brief Constructor
+
+   Sets the following item attributes:
+   - QwtPlotItem::AutoScale: true
+   - QwtPlotItem::Legend:    false
+
+   \param title Title
+*/
+QwtPlotSvgItem::QwtPlotSvgItem( const QwtText& title ):
+    QwtPlotItem( title )
+{
+    init();
+}
+
+//! Destructor
+QwtPlotSvgItem::~QwtPlotSvgItem()
+{
+    delete d_data;
+}
+
+void QwtPlotSvgItem::init()
+{
+    d_data = new PrivateData();
+    d_data->boundingRect = QwtPlotItem::boundingRect();
+
+    setItemAttribute( QwtPlotItem::AutoScale, true );
+    setItemAttribute( QwtPlotItem::Legend, false );
+
+    setZ( 8.0 );
+}
+
+//! \return QwtPlotItem::Rtti_PlotSVG
+int QwtPlotSvgItem::rtti() const
+{
+    return QwtPlotItem::Rtti_PlotSVG;
+}
+
+/*!
+   Load a SVG file
+
+   \param rect Bounding rectangle
+   \param fileName SVG file name
+
+   \return true, if the SVG file could be loaded
+*/
+bool QwtPlotSvgItem::loadFile( const QRectF &rect,
+    const QString &fileName )
+{
+    d_data->boundingRect = rect;
+    const bool ok = d_data->renderer.load( fileName );
+
+    legendChanged();
+    itemChanged();
+
+    return ok;
+}
+
+/*!
+   Load SVG data
+
+   \param rect Bounding rectangle
+   \param data in SVG format
+
+   \return true, if the SVG data could be loaded
+*/
+bool QwtPlotSvgItem::loadData( const QRectF &rect,
+    const QByteArray &data )
+{
+    d_data->boundingRect = rect;
+    const bool ok = d_data->renderer.load( data );
+
+    legendChanged();
+    itemChanged();
+
+    return ok;
+}
+
+//! Bounding rectangle of the item
+QRectF QwtPlotSvgItem::boundingRect() const
+{
+    return d_data->boundingRect;
+}
+
+//! \return Renderer used to render the SVG data
+const QSvgRenderer &QwtPlotSvgItem::renderer() const
+{
+    return d_data->renderer;
+}
+
+//! \return Renderer used to render the SVG data
+QSvgRenderer &QwtPlotSvgItem::renderer()
+{
+    return d_data->renderer;
+}
+
+/*!
+  Draw the SVG item
+
+  \param painter Painter
+  \param xMap X-Scale Map
+  \param yMap Y-Scale Map
+  \param canvasRect Contents rect of the plot canvas
+*/
+void QwtPlotSvgItem::draw( QPainter *painter,
+    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+    const QRectF &canvasRect ) const
+{
+    const QRectF cRect = QwtScaleMap::invTransform(
+        xMap, yMap, canvasRect.toRect() );
+    const QRectF bRect = boundingRect();
+    if ( bRect.isValid() && cRect.isValid() )
+    {
+        QRectF rect = bRect;
+        if ( bRect.contains( cRect ) )
+            rect = cRect;
+
+        const QRectF r = QwtScaleMap::transform( xMap, yMap, rect );
+        render( painter, viewBox( rect ), r );
+    }
+}
+
+/*!
+  Render the SVG data
+
+  \param painter Painter
+  \param viewBox View Box, see QSvgRenderer::viewBox()
+  \param rect Target rectangle on the paint device
+*/
+void QwtPlotSvgItem::render( QPainter *painter,
+    const QRectF &viewBox, const QRectF &rect ) const
+{
+    if ( !viewBox.isValid() )
+        return;
+
+    QRectF r = rect;
+
+    if ( QwtPainter::roundingAlignment( painter ) )
+    {
+        r.setLeft ( qRound( r.left() ) );
+        r.setRight ( qRound( r.right() ) );
+        r.setTop ( qRound( r.top() ) );
+        r.setBottom ( qRound( r.bottom() ) );
+    }
+
+    d_data->renderer.setViewBox( viewBox );
+    d_data->renderer.render( painter, r );
+}
+
+/*!
+  Calculate the view box from rect and boundingRect().
+
+  \param rect Rectangle in scale coordinates
+  \return View box, see QSvgRenderer::viewBox()
+*/
+QRectF QwtPlotSvgItem::viewBox( const QRectF &rect ) const
+{
+    const QSize sz = d_data->renderer.defaultSize();
+    const QRectF br = boundingRect();
+
+    if ( !rect.isValid() || !br.isValid() || sz.isNull() )
+        return QRectF();
+
+    QwtScaleMap xMap;
+    xMap.setScaleInterval( br.left(), br.right() );
+    xMap.setPaintInterval( 0, sz.width() );
+
+    QwtScaleMap yMap;
+    yMap.setScaleInterval( br.top(), br.bottom() );
+    yMap.setPaintInterval( sz.height(), 0 );
+
+    const double x1 = xMap.transform( rect.left() );
+    const double x2 = xMap.transform( rect.right() );
+    const double y1 = yMap.transform( rect.bottom() );
+    const double y2 = yMap.transform( rect.top() );
+
+    return QRectF( x1, y1, x2 - x1, y2 - y1 );
+}