scaled_image_widget.cpp

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/*
 * Copyright (c) 2012, Willow Garage, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Willow Garage, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <QWidget>
#include <QPainter>

#include "scaled_image_widget.h"

namespace rviz
{

ScaledImageWidget::ScaledImageWidget( float scale, QWidget* parent )
  : QWidget( parent )
  , scale_( scale )
{
}

void ScaledImageWidget::setImage( QPixmap image )
{
  image_ = image;
  update();
}

QSize ScaledImageWidget::sizeHint() const
{
  return image_.size() * scale_;
}

void ScaledImageWidget::paintEvent( QPaintEvent* event )
{
  if( !image_.isNull() )
  {
    QSize dest_size = image_.size();
    dest_size.scale( width(), height(), Qt::KeepAspectRatio );
    QRect dest_rect( width() / 2 - dest_size.width() / 2,
                     height() / 2 - dest_size.height() / 2,
                     dest_size.width(),
                     dest_size.height() );

    QPainter painter( this );
    painter.drawPixmap( dest_rect, image_ );
  }
}

} // end namespace rviz