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    40 ****************************************************************************/

    41 

    42 #include <QtGui>

    43 

    44 #include "diagramitem.h"

    45 #include "arrow.h"

    46 

    47 //! [0]

    48 DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu,

    49              QGraphicsItem *parent, QGraphicsScene *scene)

    50     : QGraphicsPolygonItem(parent, scene)

    51 {

    52     myDiagramType = diagramType;

    53     myContextMenu = contextMenu;

    54 

    55     QPainterPath path;

    56     switch (myDiagramType) {

    57         case StartEnd:

    58             path.moveTo(200, 50);

    59             path.arcTo(150, 0, 50, 50, 0, 90);

    60             path.arcTo(50, 0, 50, 50, 90, 90);

    61             path.arcTo(50, 50, 50, 50, 180, 90);

    62             path.arcTo(150, 50, 50, 50, 270, 90);

    63             path.lineTo(200, 25);

    64             myPolygon = path.toFillPolygon();

    65             break;

    66         case Conditional:

    67             myPolygon << QPointF(-100, 0) << QPointF(0, 100)

    68                       << QPointF(100, 0) << QPointF(0, -100)

    69                       << QPointF(-100, 0);

    70             break;

    71         case Step:

    72             myPolygon << QPointF(-100, -100) << QPointF(100, -100)

    73                       << QPointF(100, 100) << QPointF(-100, 100)

    74                       << QPointF(-100, -100);

    75             break;

    76         default:

    77             myPolygon << QPointF(-120, -80) << QPointF(-70, 80)

    78                       << QPointF(120, 80) << QPointF(70, -80)

    79                       << QPointF(-120, -80);

    80             break;

    81     }

    82     setPolygon(myPolygon);

    83     setFlag(QGraphicsItem::ItemIsMovable, true);

    84     setFlag(QGraphicsItem::ItemIsSelectable, true);

    85 }

    86 //! [0]

    87 

    88 //! [1]

    89 void DiagramItem::removeArrow(Arrow *arrow)

    90 {

    91     int index = arrows.indexOf(arrow);

    92 

    93     if (index != -1)

    94         arrows.removeAt(index);

    95 }

    96 //! [1]

    97 

    98 //! [2]

    99 void DiagramItem::removeArrows()

   100 {

   101     foreach (Arrow *arrow, arrows) {

   102         arrow->startItem()->removeArrow(arrow);

   103         arrow->endItem()->removeArrow(arrow);

   104         scene()->removeItem(arrow);

   105         delete arrow;

   106     }

   107 }

   108 //! [2]

   109 

   110 //! [3]

   111 void DiagramItem::addArrow(Arrow *arrow)

   112 {

   113     arrows.append(arrow);

   114 }

   115 //! [3]

   116 

   117 //! [4]

   118 QPixmap DiagramItem::image() const

   119 {

   120     QPixmap pixmap(250, 250);

   121     pixmap.fill(Qt::transparent);

   122     QPainter painter(&pixmap);

   123     painter.setPen(QPen(Qt::black, 8));

   124     painter.translate(125, 125);

   125     painter.drawPolyline(myPolygon);

   126 

   127     return pixmap;

   128 }

   129 //! [4]

   130 

   131 //! [5]

   132 void DiagramItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)

   133 {

   134     scene()->clearSelection();

   135     setSelected(true);

   136     myContextMenu->exec(event->screenPos());

   137 }

   138 //! [5]

   139 

   140 //! [6]

   141 QVariant DiagramItem::itemChange(GraphicsItemChange change,

   142                      const QVariant &value)

   143 {

   144     if (change == QGraphicsItem::ItemPositionChange) {

   145         foreach (Arrow *arrow, arrows) {

   146             arrow->updatePosition();

   147         }

   148     }

   149 

   150     return value;

   151 }

   152 //! [6]