改进代码

qwtdemo/qwt/qwt_plot_svgitem.h

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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
+ *****************************************************************************/
+
+#ifndef QWT_PLOT_SVGITEM_H
+#define QWT_PLOT_SVGITEM_H
+
+#include "qwt_global.h"
+#include "qwt_plot_item.h"
+#include <qstring.h>
+
+class QSvgRenderer;
+class QByteArray;
+
+/*!
+  \brief A plot item, which displays
+         data in Scalable Vector Graphics (SVG) format.
+
+  SVG images are often used to display maps
+*/
+
+class QWT_EXPORT QwtPlotSvgItem: public QwtPlotItem
+{
+public:
+    explicit QwtPlotSvgItem( const QString& title = QString() );
+    explicit QwtPlotSvgItem( const QwtText& title );
+    virtual ~QwtPlotSvgItem();
+
+    bool loadFile( const QRectF&, const QString &fileName );
+    bool loadData( const QRectF&, const QByteArray & );
+
+    virtual QRectF boundingRect() const;
+
+    virtual void draw( QPainter *,
+        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QRectF &canvasRect ) const;
+
+    virtual int rtti() const;
+
+protected:
+    const QSvgRenderer &renderer() const;
+    QSvgRenderer &renderer();
+
+    void render( QPainter *,
+        const QRectF &viewBox, const QRectF &rect ) const;
+
+    QRectF viewBox( const QRectF &rect ) const;
+
+private:
+    void init();
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif