canvas.cpp
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#include "canvas.h"
#include <qwt_graphic.h>
#include <qsvgrenderer.h>
Canvas::Canvas( Mode mode, QWidget *parent ):
QWidget( parent ),
d_mode( mode )
{
const int m = 10;
setContentsMargins( m, m, m, m );
if ( d_mode == Svg )
d_renderer = new QSvgRenderer( this );
else
d_graphic = new QwtGraphic();
}
Canvas::~Canvas()
{
if ( d_mode == VectorGraphic )
delete d_graphic;
}
void Canvas::setSvg( const QByteArray &data )
{
if ( d_mode == VectorGraphic )
{
d_graphic->reset();
QSvgRenderer renderer;
renderer.load( data );
QPainter p( d_graphic );
renderer.render( &p, renderer.viewBoxF() );
p.end();
}
else
{
d_renderer->load( data );
}
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 ( d_mode == Svg )
{
d_renderer->render( painter, rect );
}
else
{
d_graphic->render( painter, rect );
}
}