ImageView.cpp

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/*
Copyright (c) 2010-2016, Mathieu Labbe - IntRoLab - Universite de Sherbrooke
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 Universite de Sherbrooke 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 HOLDER 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 "rtabmap/gui/ImageView.h"

#include <QtGui/QWheelEvent>
#include <QtCore/qmath.h>
#include <QMenu>
#include <QFileDialog>
#include <QtCore/QDir>
#include <QAction>
#include <QGraphicsEffect>
#include <QInputDialog>
#include <QVBoxLayout>
#include <QColorDialog>
#include <QPrinter>
#include <QGraphicsRectItem>
#include "rtabmap/utilite/ULogger.h"
#include "rtabmap/gui/KeypointItem.h"
#include "rtabmap/core/util2d.h"

#include <QtGlobal>
#if QT_VERSION >= 0x050000
        #include <QStandardPaths>
#endif

namespace rtabmap {

//LineItem
class LineItem : public QGraphicsLineItem
{
public:
        LineItem(float x1, float y1, float x2, float y2, const QString & text = QString(), QGraphicsItem * parent = 0) :
                QGraphicsLineItem(x1, y1, x2, y2, parent),
                _text(text),
                _placeHolder(0)
        {
                this->setAcceptHoverEvents(true);
                this->setFlag(QGraphicsItem::ItemIsFocusable, true);
                _width = pen().width();
        }
        virtual ~LineItem()
        {
                delete _placeHolder;
        }

        void setWidth(int width)
        {
                _width = width;
                this->setPen(QPen(pen().color(), _width));
        }

protected:
        virtual void hoverEnterEvent ( QGraphicsSceneHoverEvent * event )
        {
                QGraphicsScene * scene = this->scene();
                if(scene && scene->focusItem() == 0)
                {
                        this->showDescription();
                }
                else
                {
                        this->setPen(QPen(pen().color(), _width+2));
                }
                QGraphicsLineItem::hoverEnterEvent(event);
        }

        virtual void hoverLeaveEvent ( QGraphicsSceneHoverEvent * event )
        {
                if(!this->hasFocus())
                {
                        this->hideDescription();
                }
                QGraphicsLineItem::hoverEnterEvent(event);
        }

        virtual void focusInEvent ( QFocusEvent * event )
        {
                this->showDescription();
                QGraphicsLineItem::focusInEvent(event);
        }

        virtual void focusOutEvent ( QFocusEvent * event )
        {
                this->hideDescription();
                QGraphicsLineItem::focusOutEvent(event);
        }

private:
        void showDescription()
        {
                if(!_text.isEmpty())
                {
                        if(!_placeHolder)
                        {
                                _placeHolder = new QGraphicsRectItem (this);
                                _placeHolder->setVisible(false);
                                if(qGray(pen().color().rgb() > 255/2))
                                {
                                        _placeHolder->setBrush(QBrush(QColor ( 0,0,0, 170 )));
                                }
                                else
                                {
                                        _placeHolder->setBrush(QBrush(QColor ( 255, 255, 255, 170 )));
                                }
                                QGraphicsTextItem * text = new QGraphicsTextItem(_placeHolder);
                                text->setDefaultTextColor(this->pen().color().rgb());
                                text->setPlainText(_text);
                                _placeHolder->setRect(text->boundingRect());
                        }

                        if(_placeHolder->parentItem())
                        {
                                _placeHolder->setParentItem(0); // Make it a to level item
                        }
                        _placeHolder->setZValue(this->zValue()+1);
                        _placeHolder->setPos(this->mapFromScene(0,0));
                        _placeHolder->setVisible(true);
                }
                QPen pen = this->pen();
                this->setPen(QPen(pen.color(), _width+2));
        }
        void hideDescription()
        {
                if(_placeHolder)
                {
                        _placeHolder->setVisible(false);
                }
                this->setPen(QPen(pen().color(), _width));
        }

private:
        QString _text;
        QGraphicsRectItem * _placeHolder;
        int _width;
};

QIcon ImageView::createIcon(const QColor & color)
{
        QPixmap pixmap(50, 50);
        pixmap.fill(color);
        return QIcon(pixmap);
}

ImageView::ImageView(QWidget * parent) :
                QWidget(parent),
                _alpha(100),
                _featuresSize(0.0f),
                _linesWidth(0),
                _defaultBgColor(Qt::black),
                _defaultFeatureColor(Qt::yellow),
                _defaultMatchingFeatureColor(Qt::magenta),
                _defaultMatchingLineColor(Qt::cyan),
                _depthColorMapRange(0),
                _imageItem(0),
                _imageDepthItem(0)
{
#if QT_VERSION >= 0x050000
        _savedFileName = QStandardPaths::writableLocation(QStandardPaths::PicturesLocation);
#endif
        QDir dir;
        if(!dir.exists(_savedFileName))
        {
                _savedFileName = QDir::homePath()+ "/picture.png";
        }
        else
        {
                _savedFileName += "/picture.png";
        }

        _graphicsView = new QGraphicsView(this);
        _graphicsView->setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
        _graphicsView->setScene(new QGraphicsScene(this));
        _graphicsView->setVisible(false);

        this->setLayout(new QVBoxLayout(this));
        this->layout()->addWidget(_graphicsView);
        this->layout()->setContentsMargins(0,0,0,0);

        _menu = new QMenu(tr(""), this);
        _showImage = _menu->addAction(tr("Show image"));
        _showImage->setCheckable(true);
        _showImage->setChecked(true);
        _showImageDepth = _menu->addAction(tr("Show image depth"));
        _showImageDepth->setCheckable(true);
        _showImageDepth->setChecked(false);
        _featureMenu = _menu->addMenu("Features");
        _showFeatures = _featureMenu->addAction(tr("Show features"));
        _showFeatures->setCheckable(true);
        _showFeatures->setChecked(true);
        _setFeaturesSize = _featureMenu->addAction(tr("Set features size..."));
        _showLines = _featureMenu->addAction(tr("Show lines"));
        _showLines->setCheckable(true);
        _showLines->setChecked(true);
        _setLinesWidth = _featureMenu->addAction(tr("Set lines width..."));
        _setFeatureColor = _featureMenu->addAction(tr("Set default feature color"));
        _setFeatureColor->setIcon(createIcon(_defaultFeatureColor));
        _setFeatureColor->setIconVisibleInMenu(true);
        _setMatchingFeatureColor = _featureMenu->addAction(tr("Set default correspondence color"));
        _setMatchingFeatureColor->setIcon(createIcon(_defaultMatchingFeatureColor));
        _setMatchingFeatureColor->setIconVisibleInMenu(true);
        _setMatchingLineColor = _featureMenu->addAction(tr("Set default line color"));
        _setMatchingLineColor->setIcon(createIcon(_defaultMatchingLineColor));
        _setMatchingLineColor->setIconVisibleInMenu(true);
        _setAlpha = _featureMenu->addAction(tr("Set transparency..."));
        _graphicsViewMode = _menu->addAction(tr("Graphics view"));
        _graphicsViewMode->setCheckable(true);
        _graphicsViewMode->setChecked(false);
        _scaleMenu = _menu->addMenu("Scale image");
        _scaleMenu->setEnabled(false);
        _graphicsViewScaled = _scaleMenu->addAction(tr("Fit in view"));
        _graphicsViewScaled->setCheckable(true);
        _graphicsViewScaled->setChecked(true);
        _graphicsViewScaledToHeight = _scaleMenu->addAction(tr("Fit height"));
        _graphicsViewScaledToHeight->setCheckable(true);
        _graphicsViewScaledToHeight->setChecked(false);
        _graphicsViewNoScaling = _scaleMenu->addAction(tr("No scale"));
        _graphicsViewNoScaling->setCheckable(true);
        _graphicsViewNoScaling->setChecked(false);
        QActionGroup * group = new QActionGroup(this);
        group->addAction(_graphicsViewScaled);
        group->addAction(_graphicsViewScaledToHeight);
        group->addAction(_graphicsViewNoScaling);
        QMenu * colorMap = _menu->addMenu("Depth color map");
        _colorMapWhiteToBlack = colorMap->addAction(tr("White to black"));
        _colorMapWhiteToBlack->setCheckable(true);
        _colorMapWhiteToBlack->setChecked(false);
        _colorMapBlackToWhite = colorMap->addAction(tr("Black to white"));
        _colorMapBlackToWhite->setCheckable(true);
        _colorMapBlackToWhite->setChecked(false);
        _colorMapRedToBlue = colorMap->addAction(tr("Red to blue"));
        _colorMapRedToBlue->setCheckable(true);
        _colorMapRedToBlue->setChecked(true);
        _colorMapBlueToRed = colorMap->addAction(tr("Blue to red"));
        _colorMapBlueToRed->setCheckable(true);
        _colorMapBlueToRed->setChecked(false);
        _colorMapRange = colorMap->addAction(tr("Max Range..."));
        group = new QActionGroup(this);
        group->addAction(_colorMapWhiteToBlack);
        group->addAction(_colorMapBlackToWhite);
        group->addAction(_colorMapRedToBlue);
        group->addAction(_colorMapBlueToRed);
        group->addAction(_colorMapRange);
        _saveImage = _menu->addAction(tr("Save picture..."));
        _saveImage->setEnabled(false);

        connect(_graphicsView->scene(), SIGNAL(sceneRectChanged(const QRectF &)), this, SLOT(sceneRectChanged(const QRectF &)));
}

ImageView::~ImageView() {
        clear();
}

void ImageView::saveSettings(QSettings & settings, const QString & group) const
{
        if(!group.isEmpty())
        {
                settings.beginGroup(group);
        }
        settings.setValue("image_shown", this->isImageShown());
        settings.setValue("depth_shown", this->isImageDepthShown());
        settings.setValue("features_shown", this->isFeaturesShown());
        settings.setValue("features_size", this->getFeaturesSize());
        settings.setValue("lines_shown", this->isLinesShown());
        settings.setValue("lines_width", this->getLinesWidth());
        settings.setValue("alpha", this->getAlpha());
        settings.setValue("bg_color", this->getDefaultBackgroundColor());
        settings.setValue("feature_color", this->getDefaultFeatureColor());
        settings.setValue("matching_feature_color", this->getDefaultMatchingFeatureColor());
        settings.setValue("matching_line_color", this->getDefaultMatchingLineColor());
        settings.setValue("graphics_view", this->isGraphicsViewMode());
        settings.setValue("graphics_view_scale", this->isGraphicsViewScaled());
        settings.setValue("graphics_view_scale_to_height", this->isGraphicsViewScaledToHeight());
        settings.setValue("colormap", _colorMapWhiteToBlack->isChecked()?0:_colorMapBlackToWhite->isChecked()?1:_colorMapRedToBlue->isChecked()?2:3);
        settings.setValue("colormap_range", this->getDepthColorMapRange());
        if(!group.isEmpty())
        {
                settings.endGroup();
        }
}

void ImageView::loadSettings(QSettings & settings, const QString & group)
{
        if(!group.isEmpty())
        {
                settings.beginGroup(group);
        }
        this->setImageShown(settings.value("image_shown", this->isImageShown()).toBool());
        this->setImageDepthShown(settings.value("depth_shown", this->isImageDepthShown()).toBool());
        this->setFeaturesShown(settings.value("features_shown", this->isFeaturesShown()).toBool());
        this->setFeaturesSize(settings.value("features_size", this->getFeaturesSize()).toInt());
        this->setLinesShown(settings.value("lines_shown", this->isLinesShown()).toBool());
        this->setLinesWidth(settings.value("lines_width", this->getLinesWidth()).toInt());
        this->setAlpha(settings.value("alpha", this->getAlpha()).toInt());
        this->setDefaultBackgroundColor(settings.value("bg_color", this->getDefaultBackgroundColor()).value<QColor>());
        this->setDefaultFeatureColor(settings.value("feature_color", this->getDefaultFeatureColor()).value<QColor>());
        this->setDefaultMatchingFeatureColor(settings.value("matching_feature_color", this->getDefaultMatchingFeatureColor()).value<QColor>());
        this->setDefaultMatchingLineColor(settings.value("matching_line_color", this->getDefaultMatchingLineColor()).value<QColor>());
        this->setGraphicsViewMode(settings.value("graphics_view", this->isGraphicsViewMode()).toBool());
        this->setGraphicsViewScaled(settings.value("graphics_view_scale", this->isGraphicsViewScaled()).toBool());
        this->setGraphicsViewScaledToHeight(settings.value("graphics_view_scale_to_height", this->isGraphicsViewScaledToHeight()).toBool());
        int colorMap = settings.value("colormap", 2).toInt();
        _colorMapWhiteToBlack->setChecked(colorMap==0);
        _colorMapBlackToWhite->setChecked(colorMap==1);
        _colorMapRedToBlue->setChecked(colorMap==2);
        _colorMapBlueToRed->setChecked(colorMap==3);
        this->setDepthColorMapRange(settings.value("colormap_range", this->getDepthColorMapRange()).toFloat());
        if(!group.isEmpty())
        {
                settings.endGroup();
        }
}

QRectF ImageView::sceneRect() const
{
        return _graphicsView->scene()->sceneRect();
}

bool ImageView::isImageShown() const
{
        return _showImage->isChecked();
}

bool ImageView::isImageDepthShown() const
{
        return _showImageDepth->isChecked();
}

bool ImageView::isFeaturesShown() const
{
        return _showFeatures->isChecked();
}

bool ImageView::isGraphicsViewMode() const
{
        return _graphicsViewMode->isChecked();
}

bool ImageView::isGraphicsViewScaled() const
{
        return _graphicsViewScaled->isChecked();
}

bool ImageView::isGraphicsViewScaledToHeight() const
{
        return _graphicsViewScaledToHeight->isChecked();
}

const QColor & ImageView::getDefaultBackgroundColor() const
{
        return _defaultBgColor;
}
const QColor & ImageView::getDefaultFeatureColor() const
{
        return _defaultFeatureColor;
}
const QColor & ImageView::getDefaultMatchingFeatureColor() const
{
        return _defaultMatchingFeatureColor;
}
const QColor & ImageView::getDefaultMatchingLineColor() const
{
        return _defaultMatchingLineColor;
}

const QColor & ImageView::getBackgroundColor() const
{
        return _graphicsView->backgroundBrush().color();
}

float ImageView::getDepthColorMapRange() const
{
        return _depthColorMapRange;
}

uCvQtDepthColorMap ImageView::getDepthColorMap() const
{
        uCvQtDepthColorMap colorMap = uCvQtDepthWhiteToBlack;
        if(_colorMapBlackToWhite->isChecked())
        {
                colorMap = uCvQtDepthBlackToWhite;
        }
        else if(_colorMapRedToBlue->isChecked())
        {
                colorMap = uCvQtDepthRedToBlue;
        }
        else if(_colorMapBlueToRed->isChecked())
        {
                colorMap = uCvQtDepthBlueToRed;
        }
        return colorMap;
}


void ImageView::setFeaturesShown(bool shown)
{
        _showFeatures->setChecked(shown);
        for(QMultiMap<int, KeypointItem*>::iterator iter=_features.begin(); iter!=_features.end(); ++iter)
        {
                iter.value()->setVisible(_showFeatures->isChecked());
        }

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::setImageShown(bool shown)
{
        _showImage->setChecked(shown);
        if(_imageItem)
        {
                _imageItem->setVisible(_showImage->isChecked());
                this->updateOpacity();
        }

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::setImageDepthShown(bool shown)
{
        _showImageDepth->setChecked(shown);
        if(_imageDepthItem)
        {
                _imageDepthItem->setVisible(_showImageDepth->isChecked());
                this->updateOpacity();
        }

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

bool ImageView::isLinesShown() const
{
        return _showLines->isChecked();
}

void ImageView::setLinesShown(bool shown)
{
        _showLines->setChecked(shown);
        for(int i=0; i<_lines.size(); ++i)
        {
                _lines.at(i)->setVisible(_showLines->isChecked());
        }

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

float ImageView::viewScale() const
{
        if(_graphicsView->isVisible())
        {
                return _graphicsView->transform().m11();
        }
        else
        {
                float scale, offsetX, offsetY;
                computeScaleOffsets(this->rect(), scale, offsetX, offsetY);
                return scale;
        }
}

void ImageView::setGraphicsViewMode(bool on)
{
        _graphicsViewMode->setChecked(on);
        _graphicsView->setVisible(on);
        _scaleMenu->setEnabled(on);

        if(on)
        {
                for(QMultiMap<int, KeypointItem*>::iterator iter=_features.begin(); iter!=_features.end(); ++iter)
                {
                        if(iter.value()->scene() != _graphicsView->scene())
                        {
                                _graphicsView->scene()->addItem(iter.value());
                        }
                }

                for(QList<QGraphicsLineItem*>::iterator iter=_lines.begin(); iter!=_lines.end(); ++iter)
                {
                        if((*iter)->scene() != _graphicsView->scene())
                        {
                                _graphicsView->scene()->addItem(*iter);
                        }
                }

                //update images
                if(_imageItem)
                {
                        _imageItem->setPixmap(_image);
                }
                else
                {
                        _imageItem = _graphicsView->scene()->addPixmap(_image);
                        _imageItem->setVisible(_showImage->isChecked());
                }

                if(_imageDepthItem)
                {
                        _imageDepthItem->setPixmap(_imageDepth);
                }
                else
                {
                        _imageDepthItem = _graphicsView->scene()->addPixmap(_imageDepth);
                        _imageDepthItem->setVisible(_showImageDepth->isChecked());
                }
                this->updateOpacity();

                if(_graphicsViewScaled->isChecked())
                {
                        _graphicsView->fitInView(_graphicsView->sceneRect(), Qt::KeepAspectRatio);
                }
                else if(_graphicsViewScaledToHeight->isChecked())
                {
                        QRectF rect = _graphicsView->sceneRect();
                        rect.setWidth(1);
                        _graphicsView->fitInView(rect, Qt::KeepAspectRatio);
                }
                else
                {
                        _graphicsView->resetTransform();
                }
        }
        else
        {
                this->update();
        }
}

void ImageView::setGraphicsViewScaled(bool scaled)
{
        _graphicsViewScaled->setChecked(scaled);

        if(scaled)
        {
                _graphicsView->fitInView(_graphicsView->sceneRect(), Qt::KeepAspectRatio);
        }
        else
        {
                _graphicsView->resetTransform();
        }

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::setGraphicsViewScaledToHeight(bool scaled)
{
        _graphicsViewScaledToHeight->setChecked(scaled);

        if(scaled)
        {
                QRectF rect = _graphicsView->sceneRect();
                rect.setWidth(1);
                _graphicsView->fitInView(rect, Qt::KeepAspectRatio);
        }
        else
        {
                _graphicsView->resetTransform();
        }

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::setDefaultBackgroundColor(const QColor & color)
{
        _defaultBgColor = color;
        setBackgroundColor(color);
}

void ImageView::setDefaultFeatureColor(const QColor & color)
{
        QColor previousColor = _defaultFeatureColor;
        _defaultFeatureColor = color;
        for(QMultiMap<int, KeypointItem*>::iterator iter=_features.begin(); iter!=_features.end(); ++iter)
        {
                if(QColor(iter.value()->pen().color().rgb()) == previousColor)
                {
                        QColor c = _defaultFeatureColor;
                        c.setAlpha(_alpha);
                        iter.value()->setPen(QPen(c));
                        iter.value()->setBrush(QBrush(c));
                }
        }
        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}
void ImageView::setDefaultMatchingFeatureColor(const QColor & color)
{
        QColor previousColor = _defaultMatchingFeatureColor;
        _defaultMatchingFeatureColor = color;
        for(QMultiMap<int, KeypointItem*>::iterator iter=_features.begin(); iter!=_features.end(); ++iter)
        {
                if(QColor(iter.value()->pen().color().rgb()) == previousColor)
                {
                        QColor c = _defaultMatchingFeatureColor;
                        c.setAlpha(_alpha);
                        iter.value()->setPen(QPen(c));
                        iter.value()->setBrush(QBrush(c));
                }
        }

        for(QList<QGraphicsLineItem*>::iterator iter=_lines.begin(); iter!=_lines.end(); ++iter)
        {
                if(QColor((*iter)->pen().color().rgb()) == previousColor)
                {
                        QColor c = _defaultMatchingFeatureColor;
                        c.setAlpha(_alpha);
                        (*iter)->setPen(QPen(c));
                }
        }
        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}
void ImageView::setDefaultMatchingLineColor(const QColor & color)
{
        QColor previousColor = _defaultMatchingLineColor;
        _defaultMatchingLineColor = color;
        for(QMultiMap<int, KeypointItem*>::iterator iter=_features.begin(); iter!=_features.end(); ++iter)
        {
                if(QColor(iter.value()->pen().color().rgb()) == previousColor)
                {
                        QColor c = _defaultMatchingLineColor;
                        c.setAlpha(_alpha);
                        iter.value()->setPen(QPen(c));
                        iter.value()->setBrush(QBrush(c));
                }
        }

        for(QList<QGraphicsLineItem*>::iterator iter=_lines.begin(); iter!=_lines.end(); ++iter)
        {
                if(QColor((*iter)->pen().color().rgb()) == previousColor)
                {
                        QColor c = _defaultMatchingLineColor;
                        c.setAlpha(_alpha);
                        (*iter)->setPen(QPen(c));
                }
        }
        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::setBackgroundColor(const QColor & color)
{
        _graphicsView->setBackgroundBrush(QBrush(color));

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::setDepthColorMapRange(float value)
{
        _depthColorMapRange = value;
}


void ImageView::computeScaleOffsets(const QRect & targetRect, float & scale, float & offsetX, float & offsetY) const
{
        scale = 1.0f;
        offsetX = 0.0f;
        offsetY = 0.0f;

        if(!_graphicsView->scene()->sceneRect().isNull())
        {
                float w = _graphicsView->scene()->width();
                float h = _graphicsView->scene()->height();
                float widthRatio = float(targetRect.width()) / w;
                float heightRatio = float(targetRect.height()) / h;

                //printf("w=%f, h=%f, wR=%f, hR=%f, sW=%d, sH=%d\n", w, h, widthRatio, heightRatio, this->rect().width(), this->rect().height());
                if(widthRatio < heightRatio)
                {
                        scale = widthRatio;
                }
                else
                {
                        scale = heightRatio;
                }

                //printf("ratio=%f\n",ratio);

                w *= scale;
                h *= scale;

                if(w < targetRect.width())
                {
                        offsetX = (targetRect.width() - w)/2.0f;
                }
                if(h < targetRect.height())
                {
                        offsetY = (targetRect.height() - h)/2.0f;
                }
                //printf("offsetX=%f, offsetY=%f\n",offsetX, offsetY);
        }
}

void ImageView::sceneRectChanged(const QRectF & rect)
{
        _saveImage->setEnabled(rect.isValid());
}

void ImageView::paintEvent(QPaintEvent *event)
{
        if(_graphicsViewMode->isChecked())
        {
                QWidget::paintEvent(event);
        }
        else
        {
                if(!_graphicsView->scene()->sceneRect().isNull())
                {
                        //Scale
                        float ratio, offsetX, offsetY;
                        this->computeScaleOffsets(event->rect(), ratio, offsetX, offsetY);
                        QPainter painter(this);

                        //Background
                        painter.save();
                        painter.setBrush(_graphicsView->backgroundBrush());
                        painter.drawRect(event->rect());
                        painter.restore();

                        painter.translate(offsetX, offsetY);
                        painter.scale(ratio, ratio);

                        painter.save();
                        if(_showImage->isChecked() && !_image.isNull() &&
                           _showImageDepth->isChecked() && !_imageDepth.isNull())
                        {
                                painter.setOpacity(0.5);
                        }

                        if(_showImage->isChecked() && !_image.isNull())
                        {
                                painter.drawPixmap(QPoint(0,0), _image);
                        }

                        if(_showImageDepth->isChecked() && !_imageDepth.isNull())
                        {
                                painter.drawPixmap(QPoint(0,0), _imageDepth);
                        }
                        painter.restore();

                        if(_showFeatures->isChecked())
                        {
                                for(QMultiMap<int, rtabmap::KeypointItem *>::iterator iter = _features.begin(); iter != _features.end(); ++iter)
                                {
                                        QColor color = iter.value()->pen().color();
                                        painter.save();
                                        painter.setPen(color);
                                        painter.setBrush(color);
                                        painter.drawEllipse(iter.value()->rect());
                                        painter.restore();
                                }
                        }

                        if(_showLines->isChecked())
                        {
                                for(QList<QGraphicsLineItem*>::iterator iter = _lines.begin(); iter != _lines.end(); ++iter)
                                {
                                        painter.save();
                                        painter.setPen(QPen((*iter)->pen().color(), _linesWidth));
                                        painter.drawLine((*iter)->line());
                                        painter.restore();
                                }
                        }
                }
        }
}

void ImageView::resizeEvent(QResizeEvent* event)
{
        QWidget::resizeEvent(event);
        if(_graphicsView->isVisible())
        {
                if(_graphicsViewScaled->isChecked())
                {
                        _graphicsView->fitInView(_graphicsView->sceneRect(), Qt::KeepAspectRatio);
                }
                else if(_graphicsViewScaledToHeight->isChecked())
                {
                        QRectF rect = _graphicsView->sceneRect();
                        rect.setWidth(1);
                        _graphicsView->fitInView(rect, Qt::KeepAspectRatio);
                }
        }
}

void ImageView::contextMenuEvent(QContextMenuEvent * e)
{
        _setFeatureColor->setIcon(createIcon(_defaultFeatureColor));
        _setMatchingFeatureColor->setIcon(createIcon(_defaultMatchingFeatureColor));
        _setMatchingLineColor->setIcon(createIcon(_defaultMatchingLineColor));
        _setFeatureColor->setIconVisibleInMenu(true);
        _setMatchingFeatureColor->setIconVisibleInMenu(true);
        _setMatchingLineColor->setIconVisibleInMenu(true);

        QAction * action = _menu->exec(e->globalPos());
        if(action == _saveImage)
        {
                if(!_graphicsView->scene()->sceneRect().isNull())
                {
                        QString text;
                        QString extensions = "*.png *.xpm *.jpg";
                        if(_graphicsView->isVisible())
                        {
                                extensions += " *.pdf";
                        }
#ifdef QT_SVG_LIB
                        extensions += " *.svg";
#endif
                        text = QFileDialog::getSaveFileName(this, tr("Save figure to ..."), _savedFileName, extensions);

                        if(!text.isEmpty())
                        {
                                if(QFileInfo(text).suffix() == "")
                                {
                                        //use png by default
                                        text += ".png";
                                }

                                _savedFileName = text;
                                if(QFileInfo(text).suffix().compare("pdf") == 0)
                                {
                                        QPrinter printer(QPrinter::HighResolution);
                                        printer.setOrientation(QPrinter::Portrait);
                                        printer.setOutputFileName( text );
                                        QPainter p(&printer);
                                        p.begin(&printer);
                                        double xscale = printer.pageRect().width()/double(_graphicsView->sceneRect().width());
                                        double yscale = printer.pageRect().height()/double(_graphicsView->sceneRect().height());
                                        double scale = qMin(xscale, yscale);
                                        p.scale(scale, scale);
                                        _graphicsView->scene()->render(&p, _graphicsView->sceneRect(), _graphicsView->sceneRect());
                                        p.end();
                                }
                                else
                                {
                                        QImage img(_graphicsView->sceneRect().width(), _graphicsView->sceneRect().height(), QImage::Format_ARGB32_Premultiplied);
                                        QPainter p(&img);
                                        if(_graphicsView->isVisible())
                                        {
                                                _graphicsView->scene()->render(&p, _graphicsView->sceneRect(), _graphicsView->sceneRect());
                                        }
                                        else
                                        {
                                                this->render(&p, QPoint(), _graphicsView->sceneRect().toRect());
                                        }
                                        img.save(text);
                                }
                        }
                }
        }
        else if(action == _showFeatures)
        {
                this->setFeaturesShown(_showFeatures->isChecked());
                Q_EMIT configChanged();
        }
        else if(action == _setFeatureColor ||
                        action == _setMatchingFeatureColor ||
                        action == _setMatchingLineColor)
        {
                QColor color;
                if(action == _setMatchingFeatureColor)
                {
                        color = _defaultMatchingFeatureColor;
                }
                else if(action == _setMatchingLineColor)
                {
                        color = _defaultMatchingLineColor;
                }
                else //if(action == _setFeatureColor)
                {
                        color = _defaultFeatureColor;
                }
                color = QColorDialog::getColor(color, this);
                if(color.isValid())
                {

                        if(action == _setMatchingFeatureColor)
                        {
                                this->setDefaultMatchingFeatureColor(color);
                        }
                        else if(action == _setMatchingLineColor)
                        {
                                this->setDefaultMatchingLineColor(color);
                        }
                        else //if(action == _setFeatureColor)
                        {
                                this->setDefaultFeatureColor(color);
                        }
                }
        }
        else if(action == _showImage)
        {
                this->setImageShown(_showImage->isChecked());
                Q_EMIT configChanged();
        }
        else if(action == _showImageDepth)
        {
                this->setImageDepthShown(_showImageDepth->isChecked());
                Q_EMIT configChanged();
        }
        else if(action == _showLines)
        {
                this->setLinesShown(_showLines->isChecked());
                Q_EMIT configChanged();
        }
        else if(action == _graphicsViewMode)
        {
                this->setGraphicsViewMode(_graphicsViewMode->isChecked());
                Q_EMIT configChanged();
        }
        else if(action == _graphicsViewScaled)
        {
                this->setGraphicsViewScaled(_graphicsViewScaled->isChecked());
                Q_EMIT configChanged();
        }
        else if(action == _graphicsViewScaledToHeight || action == _graphicsViewNoScaling)
        {
                this->setGraphicsViewScaledToHeight(_graphicsViewScaledToHeight->isChecked());
                Q_EMIT configChanged();
        }
        else if(action == _colorMapBlackToWhite || action == _colorMapWhiteToBlack || action == _colorMapRedToBlue || action == _colorMapBlueToRed)
        {
                if(!_imageDepthCv.empty())
                        this->setImageDepth(_imageDepthCv);
                Q_EMIT configChanged();
        }
        else if(action == _colorMapRange)
        {
                bool ok = false;
                double value = QInputDialog::getDouble(this, tr("Set depth colormap max range"), tr("Range (m), 0=no limit"), _depthColorMapRange, 0, 9999, 1, &ok);
                if(ok)
                {
                        this->setDepthColorMapRange(value);
                        Q_EMIT configChanged();
                }
        }
        else if(action == _setAlpha)
        {
                bool ok = false;
                int value = QInputDialog::getInt(this, tr("Set features and lines transparency"), tr("alpha (0-255)"), _alpha, 0, 255, 10, &ok);
                if(ok)
                {
                        this->setAlpha(value);
                        Q_EMIT configChanged();
                }
        }
        else if(action == _setFeaturesSize)
        {
                bool ok = false;
                int value = QInputDialog::getInt(this, tr("Set features size"), tr("Size (0 means actual keypoint size)"), _featuresSize, 0, 999, 1, &ok);
                if(ok)
                {
                        this->setFeaturesSize(value);
                        Q_EMIT configChanged();
                }
        }
        else if(action == _setLinesWidth)
        {
                bool ok = false;
                int value = QInputDialog::getInt(this, tr("Set lines width"), tr("Width"), _linesWidth, 0, 999, 1, &ok);
                if(ok)
                {
                        this->setLinesWidth(value);
                        Q_EMIT configChanged();
                }
        }

        if(action == _showImage || action ==_showImageDepth)
        {
                this->updateOpacity();
                Q_EMIT configChanged();
        }
}

void ImageView::updateOpacity()
{
        if(_imageItem && _imageDepthItem)
        {
                if(_imageItem->isVisible() && _imageDepthItem->isVisible())
                {
                        QGraphicsOpacityEffect * effect = new QGraphicsOpacityEffect();
                        effect->setOpacity(0.5);
                        _imageDepthItem->setGraphicsEffect(effect);
                }
                else
                {
                        _imageDepthItem->setGraphicsEffect(0);
                }
        }
        else if(_imageDepthItem)
        {
                _imageDepthItem->setGraphicsEffect(0);
        }
}

void ImageView::setFeatures(const std::multimap<int, cv::KeyPoint> & refWords, const cv::Mat & depth, const QColor & color)
{
        clearFeatures();

        float xRatio = 0;
        float yRatio = 0;
        if (this->sceneRect().isValid() && !depth.empty() && int(this->sceneRect().height()) % depth.rows == 0 && int(this->sceneRect().width()) % depth.cols == 0)
        {
                UDEBUG("depth=%dx%d sceneRect=%fx%f", depth.cols, depth.rows, this->sceneRect().width(), this->sceneRect().height());
                xRatio = float(depth.cols)/float(this->sceneRect().width());
                yRatio = float(depth.rows)/float(this->sceneRect().height());
                UDEBUG("xRatio=%f yRatio=%f", xRatio, yRatio);
        }

        for(std::multimap<int, cv::KeyPoint>::const_iterator iter = refWords.begin(); iter != refWords.end(); ++iter )
        {
                if (xRatio > 0 && yRatio > 0)
                {
                        addFeature(iter->first, iter->second, util2d::getDepth(depth, iter->second.pt.x*xRatio, iter->second.pt.y*yRatio, false), color);
                }
                else
                {
                        addFeature(iter->first, iter->second, 0, color);
                }
        }

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::setFeatures(const std::vector<cv::KeyPoint> & features, const cv::Mat & depth, const QColor & color)
{
        clearFeatures();

        float xRatio = 0;
        float yRatio = 0;
        if (this->sceneRect().isValid() && !depth.empty() && int(this->sceneRect().height()) % depth.rows == 0 && int(this->sceneRect().width()) % depth.cols == 0)
        {
                UDEBUG("depth=%dx%d sceneRect=%fx%f", depth.cols, depth.rows, this->sceneRect().width(), this->sceneRect().height());
                xRatio = float(depth.cols) / float(this->sceneRect().width());
                yRatio = float(depth.rows) / float(this->sceneRect().height());
                UDEBUG("xRatio=%f yRatio=%f", xRatio, yRatio);
        }

        for(unsigned int i = 0; i< features.size(); ++i )
        {
                if(xRatio > 0 && yRatio > 0)
                {
                        addFeature(i, features[i], util2d::getDepth(depth, features[i].pt.x*xRatio, features[i].pt.y*yRatio, false), color);
                }
                else
                {
                        addFeature(i, features[i], 0, color);
                }
        }

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::addFeature(int id, const cv::KeyPoint & kpt, float depth, QColor color)
{
        color.setAlpha(this->getAlpha());
        rtabmap::KeypointItem * item = new rtabmap::KeypointItem(id, kpt, depth, color);
        if(_featuresSize>0.0f)
        {
                item->setRect(kpt.pt.x-_featuresSize/2.0f, kpt.pt.y-_featuresSize/2.0f, _featuresSize, _featuresSize);
        }
        _features.insert(id, item);
        item->setVisible(isFeaturesShown());
        item->setZValue(1);

        if(_graphicsView->isVisible())
        {
                _graphicsView->scene()->addItem(item);
        }
}

void ImageView::addLine(float x1, float y1, float x2, float y2, QColor color, const QString & text)
{
        color.setAlpha(this->getAlpha());
        LineItem * item  = new LineItem(x1, y1, x2, y2, text);
        item->setPen(QPen(color));
        item->setWidth(_linesWidth);
        _lines.push_back(item);
        item->setVisible(isLinesShown());
        item->setZValue(1);

        if(_graphicsView->isVisible())
        {
                _graphicsView->scene()->addItem(item);
        }
}

void ImageView::setImage(const QImage & image)
{
        _image = QPixmap::fromImage(image);
        if(_graphicsView->isVisible())
        {
                if(_imageItem)
                {
                        _imageItem->setPixmap(_image);
                }
                else
                {
                        _imageItem = _graphicsView->scene()->addPixmap(_image);
                        _imageItem->setVisible(_showImage->isChecked());
                        this->updateOpacity();
                }
        }

        if(image.rect().isValid())
        {
                this->setSceneRect(image.rect());
        }
        else if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::setImageDepth(const cv::Mat & imageDepth)
{
        _imageDepthCv = imageDepth;
        setImageDepth(uCvMat2QImage(_imageDepthCv, true, getDepthColorMap(), 0.0f, _depthColorMapRange));
}

void ImageView::setImageDepth(const QImage & imageDepth)
{
        _imageDepth = QPixmap::fromImage(imageDepth);

        UASSERT(_imageDepth.width() && _imageDepth.height());

        if( _image.width() > 0 &&
                _image.width() > _imageDepth.width() &&
                _image.height() > _imageDepth.height())
        {
                // scale depth to rgb
                _imageDepth = _imageDepth.scaled(_image.size());
        }

        if(_graphicsView->isVisible())
        {
                if(_imageDepthItem)
                {
                        _imageDepthItem->setPixmap(_imageDepth);
                }
                else
                {
                        _imageDepthItem = _graphicsView->scene()->addPixmap(_imageDepth);
                        _imageDepthItem->setVisible(_showImageDepth->isChecked());
                        this->updateOpacity();
                }
        }
        else
        {
                if(_image.isNull())
                {
                        this->setSceneRect(imageDepth.rect());
                }
                this->update();
        }
}

void ImageView::setFeatureColor(int id, QColor color)
{
        color.setAlpha(getAlpha());
        QList<KeypointItem*> items = _features.values(id);
        if(items.size())
        {
                for(int i=0; i<items.size(); ++i)
                {
                        items[i]->setColor(color);
                }
        }
        else
        {
                UWARN("Not found feature %d", id);
        }

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::setFeaturesColor(QColor color)
{
        color.setAlpha(getAlpha());
        for(QMultiMap<int, KeypointItem*>::iterator iter=_features.begin(); iter!=_features.end(); ++iter)
        {
                iter.value()->setColor(color);
        }

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::setAlpha(int alpha)
{
        UASSERT(alpha >=0 && alpha <= 255);
        _alpha = alpha;
        for(QMultiMap<int, KeypointItem*>::iterator iter=_features.begin(); iter!=_features.end(); ++iter)
        {
                QColor c = iter.value()->pen().color();
                c.setAlpha(_alpha);
                iter.value()->setPen(QPen(c));
                iter.value()->setBrush(QBrush(c));
        }

        for(QList<QGraphicsLineItem*>::iterator iter=_lines.begin(); iter!=_lines.end(); ++iter)
        {
                QColor c = (*iter)->pen().color();
                c.setAlpha(_alpha);
                (*iter)->setPen(QPen(c));
        }

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::setFeaturesSize(int size)
{
        _featuresSize = size;
        for(QMultiMap<int, KeypointItem*>::iterator iter=_features.begin(); iter!=_features.end(); ++iter)
        {
                const cv::KeyPoint & kpt = iter.value()->keypoint();
                if(size <= 0.0f)
                {
                        size = kpt.size==0?3:kpt.size;
                }
                float sizef = size;
                iter.value()->setRect(kpt.pt.x-sizef/2.0f, kpt.pt.y-sizef/2.0f, sizef, sizef);
        }

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::setLinesWidth(int width)
{
        _linesWidth = width;
        for(QList<QGraphicsLineItem*>::iterator iter=_lines.begin(); iter!=_lines.end(); ++iter)
        {
                if(dynamic_cast<LineItem*>(*iter))
                {
                        ((LineItem*)(*iter))->setWidth(_linesWidth);
                }
        }
        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::setSceneRect(const QRectF & rect)
{
        _graphicsView->scene()->setSceneRect(rect);

        if(_graphicsViewScaled->isChecked())
        {
                _graphicsView->fitInView(_graphicsView->sceneRect(), Qt::KeepAspectRatio);
        }
        else if(_graphicsViewScaledToHeight->isChecked())
        {
                QRectF rect = _graphicsView->sceneRect();
                rect.setWidth(1);
                _graphicsView->fitInView(rect, Qt::KeepAspectRatio);
        }
        else
        {
                _graphicsView->resetTransform();
        }

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::clearLines()
{
        qDeleteAll(_lines);
        _lines.clear();

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::clearFeatures()
{
        qDeleteAll(_features);
        _features.clear();

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

void ImageView::clear()
{
        clearFeatures();

        qDeleteAll(_lines);
        _lines.clear();

        if(_imageItem)
        {
                _graphicsView->scene()->removeItem(_imageItem);
                delete _imageItem;
                _imageItem = 0;
        }
        _image = QPixmap();

        if(_imageDepthItem)
        {
                _graphicsView->scene()->removeItem(_imageDepthItem);
                delete _imageDepthItem;
                _imageDepthItem = 0;
        }
        _imageDepth = QPixmap();

        _graphicsView->scene()->setSceneRect(QRectF());
        _graphicsView->setScene(_graphicsView->scene());

        if(!_graphicsView->isVisible())
        {
                this->update();
        }
}

QSize ImageView::sizeHint() const
{
        return _graphicsView->sizeHint();
}

}