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/*****************************************************************************
* $CAMITK_LICENCE_BEGIN$
*
* CamiTK - Computer Assisted Medical Intervention ToolKit
* (c) 2001-2025 Univ. Grenoble Alpes, CNRS, Grenoble INP - UGA, TIMC, 38000 Grenoble, France
*
* Visit http://camitk.imag.fr for more information
*
* This file is part of CamiTK.
*
* CamiTK is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* CamiTK 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 version 3 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with CamiTK. If not, see <http://www.gnu.org/licenses/>.
*
* $CAMITK_LICENCE_END$
****************************************************************************/
#ifndef GRAPHDISPLAYWIDGET_H
#define GRAPHDISPLAYWIDGET_H
#include "CamiTKAPI.h"
// Qt Stuff
#include <QObject>
#include <QGraphicsView>
#include <QGraphicsScene>
#include <QGraphicsItem>
#include <QColor>
#include <QPen>
#include <QVector>
#include <QMap>
namespace camitk {
/**
* GraphDisplayWidget is used to manage a Widget to display a
* graph with nodes and links onto a 2D canvas. It's inherits from QGraphicsView.
*
* It is used by TransformationExplorer to display the graph of FrameOfReference and Transformation
* but is not aware of the object that are managed graphically (all managed using const void*)
*/
class CAMITK_API GraphDisplayWidget : public QGraphicsView {
Q_OBJECT
public:
/// constructor (build the scene and connect signals/slots)
GraphDisplayWidget(QWidget* parent = nullptr);
/// destructor
virtual ~GraphDisplayWidget();
/**
* Empty all nodes and links
*/
void clear();
/**
* Add a node to the graph.
*
* @param ptr the Object referred to by the node
* @param tooltip The tooltip to be displayed when the mouse hovers over the node
* @param color The color of the disc representing the node
* @param lineColor The color of the circle around the disc
* @param internalText Text to display inside the node (can be any UTF-8 character)
*/
void addNode(const void* ptr, QString tooltip, QColor color, QColor lineColor, QString internalText = "");
/**
* Add a link in the graph.
*
* @param ptr a pointer to the object that is represented by this link.
* @param from a pointer to the object represented as a node (and added before by addNode) that this links from
* @param to a pointer to the object represented as a node (and added before by addNode) that this links to
* @param tooltip The tooltip to be displayed when the mouse hovers over the link
* @param pen The pen used to draw the line (color, brush, width...)
* @param arrowHead if true adds an arrow pointing to the to object
*/
void addLink(const void* ptr, const void* from, const void* to, QString tooltip, const QPen& pen, bool arrowHead);
/**
* Refresh the 2D canvas display
*/
void refresh();
/**
* Resize the content of the canvas to the size of the widget
*/
void autoScale();
/**
* Set the diameter of nodes' graphical representation
*/
void setNodeDiameter(float d);
signals:
/**
* Signal emitted when a node was selected in the 2D canvas
* It sends the pointer to the object represented by the node
*/
void nodeSelectionChanged(const void* node);
/**
* Signal emitted when a link was selected in the 2D canvas
* It sends the pointer to the object represented by the link
*/
void linkSelectionChanged(const void* link);
/// node was double clicked
void nodeDoubleClicked(const void* node);
/// link was double clicked
void linkDoubleClicked(const void* node);
public slots:
/**
* Specify to the view that a node was selected
* @param node a pointer to the object represented by the node
*/
void setSelectedNode(const void* node);
/**
* Specify to the view that a link was selected
* @param link a pointer to the object represented by the link
*/
void setSelectedLink(const void* link);
/// Get the selection of nodes and links from the 2D canvas
void updateView();
protected:
/// process double clicked nodes and link
void mouseDoubleClickEvent(QMouseEvent*) override;
/// make sure the scene fit the new size entirely
void resizeEvent(QResizeEvent*) override;
// make sure the scene fits all the potentially moved nodes
void mouseReleaseEvent(QMouseEvent* e) override;
private:
/// Diameter of a node representation
double diameter;
/// selection pen half width used to shrink selected nodes
double halfPenWidth;
/// Finding graphical items from objects and links, finding objects and links from graphical items
/// node2item[nodeObjectPtr] = graphicalItem
QMap<const void*, QGraphicsEllipseItem*> node2item;
// same but for internal text decoration
QMap<const void*, QGraphicsSimpleTextItem*> node2textItem;
/// item2node[graphicalItem] = nodeObjectPtr
QMap<QGraphicsEllipseItem*, const void*> item2node;
/// textItem2node[graphicalItem] = nodeObjectPtr
QMap<QGraphicsSimpleTextItem*, const void*> textItem2node;
/// link2item[linkObjectPtr] = graphicalItem
QMap<const void*, QGraphicsLineItem*> link2item;
// same but for the arrow heads
QMap<const void*, QGraphicsPolygonItem*> link2arrowHead;
/// item2link[graphicalItem] = linkObjectPtr
QMap<QGraphicsLineItem*, const void*> item2link;
// Selections
const void* currentSelectedNode;
const void* currentSelectedLink;
// Pens to manage to selected/unselected
QPen selectedPen;
QMap<const void*, QPen> unselectedPen;
// For each link, from and to nodes
QMap<const void*, std::pair<const void*, const void*>> links;
// nodeArity[nodeObjectPtr] is the number of links from and to the node
QMap<const void*, int> nodeArity;
// Move the graphical representation of a node in the canvas
void moveNode(const void* ptr, float posX, float posY);
// Move the graphical representation of a link in the canvas
void moveLink(const void* ptr, float posX1, float posY1, float posX2, float posY2);
// update link position using the node (new) center, called when nodes are moved
void updateLinkPosition();
// currently being update, n
};
} // namespace camitk
#endif // GRAPHDISPLAYWIDGET_H
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