WTransferFunctionLine.h

//---------------------------------------------------------------------------
//
// Project: OpenWalnut ( http://www.openwalnut.org )
//
// Copyright 2009 OpenWalnut Community, BSV@Uni-Leipzig and CNCF@MPI-CBS
// For more information see http://www.openwalnut.org/copying
//
// This file is part of OpenWalnut.
//
// OpenWalnut is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// OpenWalnut is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with OpenWalnut. If not, see <http://www.gnu.org/licenses/>.
//
//---------------------------------------------------------------------------
 
#ifndef WTRANSFERFUNCTIONLINE_H
#define WTRANSFERFUNCTIONLINE_H
 
#include "QGraphicsLineItem"
 
class WTransferFunctionWidget;
class WTransferFunctionPoint;
 
/**
 * Line object for the connection of alpha control points.
 */
class WTransferFunctionLine : public QGraphicsLineItem
{
public:
    /** type of the base class */
    typedef QGraphicsLineItem BaseClass;
 
    /**
     * Default constructor.
     *
     * \param parent parent widget
     */
    explicit WTransferFunctionLine( WTransferFunctionWidget* parent = 0x0 );
 
    /**
     * Default destructor.
     **/
    virtual ~WTransferFunctionLine();
 
    /**
     * Get the point to the left.
     *
     * \returns point to the left
     */
    WTransferFunctionPoint* getLeft() const;
 
    /**
     * Get the point to the right.
     *
     * \returns point to the right
     */
    WTransferFunctionPoint* getRight() const;
 
    /**
     * Sets point to the left.
     *
     * \param left new point to the left
     */
    void setLeft( WTransferFunctionPoint* left );
 
    /**
     * Sets point to the right.
     *
     * \param right new point to the right
     */
    void setRight( WTransferFunctionPoint* right );
 
    /**
     * Paint the line.
     *
     * \param painter the painter used
     * \param option the style option used for painting
     * \param widget the widget used for painting
     */
    virtual void paint( QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget* widget );
 
protected:
    // to be implemented: how do we want to handle moves of lines?
    // I think a vertical move may be nice, but may even be implemented using
    // itemChange(...)
    //void mouseMoveEvent( QGraphicsSceneMouseEvent *event );
    //void mousePressEvent( QGraphicsSceneMouseEvent *event );
    //void mouseReleaseEvent( QGraphicsSceneMouseEvent *event );
 
private:
    /** the width of the line used for painting */
    double lineWidth;
 
    /** the point to the left */
    WTransferFunctionPoint *left;
 
    /** the point to the right */
    WTransferFunctionPoint *right;
};
 
#endif  // WTRANSFERFUNCTIONLINE_H