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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_legend.h"
#include "qwt_legend_item.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();
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 );
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 );
itemChanged();
return ok;
}
//! Bounding rect 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 Traget 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 viewBox from an rect and boundingRect().
\param rect Rectangle in scale coordinates
\return viewBox 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 );
}
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