SCurvedHistogram.hpp

/* ***** BEGIN LICENSE BLOCK *****
 * FW4SPL - Copyright (C) IRCAD, 2009-2017.
 * Distributed under the terms of the GNU Lesser General Public License (LGPL) as
 * published by the Free Software Foundation.
 * ****** END LICENSE BLOCK ****** */

#ifndef __SCENE2D_ADAPTOR_SCURVEDHISTOGRAM_HPP__
#define __SCENE2D_ADAPTOR_SCURVEDHISTOGRAM_HPP__

#include "scene2D/config.hpp"

#include <fwData/Histogram.hpp>
#include <fwData/Point.hpp>

#include <fwRenderQt/IAdaptor.hpp>

namespace scene2D
{

namespace adaptor
{

class SCENE2D_CLASS_API SCurvedHistogram : public ::fwRenderQt::IAdaptor
{
public:
    fwCoreServiceClassDefinitionsMacro( (SCurvedHistogram)( ::fwRenderQt::IAdaptor) );

    typedef ::fwRenderQt::IAdaptor::Point2DType Point;
    typedef std::vector< Point > Points;

    SCENE2D_API SCurvedHistogram() noexcept;
    SCENE2D_API virtual ~SCurvedHistogram() noexcept;

protected:
    SCENE2D_API void configuring() override;
    SCENE2D_API void starting() override;
    SCENE2D_API void updating() override;
    SCENE2D_API void stopping() override;

    SCENE2D_API void processInteraction( ::fwRenderQt::data::Event& _event ) override;

    SCENE2D_API ::fwServices::IService::KeyConnectionsMap getAutoConnections() const override;

    static const float SCALE;

    static const float NB_POINTS_BEZIER;

private:

    Points getControlPoints(const ::fwData::Histogram::csptr& _histogram ) const;

    Points getBSplinePoints( const Points& _controlPoints ) const;

    Points getResampledBSplinePoints( const Points& _bSplinePoints ) const;

    void buildBSplineFromPoints( Points& _bSplinePoints );

    void computePointToPathLengthMapFromBSplinePoints( Points& _bSplinePoints );

    void updateCurrentPoint(const ::fwRenderQt::data::Event& _event, const ::fwData::Point::sptr& point );

    void addBorderItem( const QPainterPath& _path );

    void addInnerItem( const QPainterPath& _path );

    Points linearInterpolation( const Point _p1, const Point _p2 );

    Points cosinusInterpolation( const Point _p0, const Point _p1 );

    Points quadraticInterpolation( const Point _p0, const Point _p1, const Point _p2 );

    Points cubicInterpolation(const Point _p0, const Point _p1, const Point _p2, const Point _p3 );

    // Map the absciss of the points to the corresponding length within the path.
    std::map<double, double> m_positionsToPathLength;

    QPen m_borderColor;

    // Color used for graphic histogram's inner color. If no value is supplied in the configuration,
    // item's inner will be transparent
    QPen m_innerColor;

    QBrush m_brush;

    // A Qt painter that is used to build a curve representing the shape of the histogram.
    // Note that the histogram won't be built thanks to this path because of a lack of performance.
    // In other words, this painter path won't be used to build a graphic item that will be added to
    // a Qt graphics scene. The graphic representation of the histogram will composed of multiple items
    // build thanks to painters like this one, because it improves significantly the rendering performance.
    // This painter path will be used to provide information about the histogram: for instance, it will help
    // to retrieve the coordinates of path's points.
    QPainterPath* m_painterPath;

    float m_borderWidth;

    float m_scale;

    // Graphics items contained into m_items are also added to this group item,
    // which is then added to the scene.
    // (This is the only graphic item which has to be added into the scene).
    QGraphicsItemGroup* m_layer;
};

}   // namespace adaptor

}   // namespace scene2D

#endif  // __SCENE2D_ADAPTOR_SCURVEDHISTOGRAM_HPP__