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    41 

    42 #ifndef ARROW_H

    43 #define ARROW_H

    44 

    45 #include <QGraphicsLineItem>

    46 

    47 #include "diagramitem.h"

    48 

    49 QT_BEGIN_NAMESPACE

    50 class QGraphicsPolygonItem;

    51 class QGraphicsLineItem;

    52 class QGraphicsScene;

    53 class QRectF;

    54 class QGraphicsSceneMouseEvent;

    55 class QPainterPath;

    56 QT_END_NAMESPACE

    57 

    58 //! [0]

    59 class Arrow : public QGraphicsLineItem

    60 {

    61 public:

    62     enum { Type = UserType + 4 };

    63 

    64     Arrow(DiagramItem *startItem, DiagramItem *endItem,

    65       QGraphicsItem *parent = 0, QGraphicsScene *scene = 0);

    66 

    67     int type() const

    68         { return Type; }

    69     QRectF boundingRect() const;

    70     QPainterPath shape() const;

    71     void setColor(const QColor &color)

    72         { myColor = color; }

    73     DiagramItem *startItem() const

    74         { return myStartItem; }

    75     DiagramItem *endItem() const

    76         { return myEndItem; }

    77 

    78 

    79 public slots:

    80     void updatePosition();

    81 

    82 protected:

    83     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,

    84                QWidget *widget = 0);

    85 

    86 private:

    87     DiagramItem *myStartItem;

    88     DiagramItem *myEndItem;

    89     QColor myColor;

    90     QPolygonF arrowHead;

    91 };

    92 //! [0]

    93 

    94 #endif