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playground/graphicscale/Canvas.cpp

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#include "Canvas.h"
+#include <QwtGraphic>
+#include <QSvgRenderer>
+
+Canvas::Canvas( Mode mode, QWidget* parent )
+    : QWidget( parent )
+    , m_mode( mode )
+{
+    const int m = 10;
+    setContentsMargins( m, m, m, m );
+
+    if ( m_mode == Svg )
+        m_renderer = new QSvgRenderer( this );
+    else
+        m_graphic = new QwtGraphic();
+}
+
+Canvas::~Canvas()
+{
+    if ( m_mode == VectorGraphic )
+        delete m_graphic;
+}
+
+void Canvas::setSvg( const QByteArray& svgData )
+{
+    if ( m_mode == VectorGraphic )
+    {
+        m_graphic->reset();
+
+        QSvgRenderer renderer;
+        renderer.load( svgData );
+
+        QPainter p( m_graphic );
+        renderer.render( &p, renderer.viewBoxF() );
+        p.end();
+    }
+    else
+    {
+        m_renderer->load( svgData );
+    }
+
+    update();
+}
+
+void Canvas::paintEvent( QPaintEvent* )
+{
+    QPainter painter( this );
+
+    painter.save();
+
+    painter.setPen( Qt::black );
+    painter.setBrush( Qt::white );
+    painter.drawRect( contentsRect().adjusted( 0, 0, -1, -1 ) );
+
+    painter.restore();
+
+    painter.setPen( Qt::NoPen );
+    painter.setBrush( Qt::NoBrush );
+    render( &painter, contentsRect() );
+}
+
+void Canvas::render( QPainter* painter, const QRect& rect ) const
+{
+    if ( m_mode == Svg )
+    {
+        m_renderer->render( painter, rect );
+    }
+    else
+    {
+        m_graphic->render( painter, rect );
+    }
+}