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40
41 #include <QtGui>
42
43 #include "diagramitem.h"
44 #include "arrow.h"
45
46 //! [0]
DiagramItem(DiagramType diagramType,QMenu * contextMenu,QGraphicsItem * parent,QGraphicsScene * scene)47 DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu,
48 QGraphicsItem *parent, QGraphicsScene *scene)
49 : QGraphicsPolygonItem(parent, scene)
50 {
51 myDiagramType = diagramType;
52 myContextMenu = contextMenu;
53
54 QPainterPath path;
55 switch (myDiagramType) {
56 case StartEnd:
57 path.moveTo(200, 50);
58 path.arcTo(150, 0, 50, 50, 0, 90);
59 path.arcTo(50, 0, 50, 50, 90, 90);
60 path.arcTo(50, 50, 50, 50, 180, 90);
61 path.arcTo(150, 50, 50, 50, 270, 90);
62 path.lineTo(200, 25);
63 myPolygon = path.toFillPolygon();
64 break;
65 case Conditional:
66 myPolygon << QPointF(-100, 0) << QPointF(0, 100)
67 << QPointF(100, 0) << QPointF(0, -100)
68 << QPointF(-100, 0);
69 break;
70 case Step:
71 myPolygon << QPointF(-100, -100) << QPointF(100, -100)
72 << QPointF(100, 100) << QPointF(-100, 100)
73 << QPointF(-100, -100);
74 break;
75 default:
76 myPolygon << QPointF(-120, -80) << QPointF(-70, 80)
77 << QPointF(120, 80) << QPointF(70, -80)
78 << QPointF(-120, -80);
79 break;
80 }
81 setPolygon(myPolygon);
82 setFlag(QGraphicsItem::ItemIsMovable, true);
83 setFlag(QGraphicsItem::ItemIsSelectable, true);
84 setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
85 }
86 //! [0]
87
88 //! [1]
removeArrow(Arrow * arrow)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]
removeArrows()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]
addArrow(Arrow * arrow)111 void DiagramItem::addArrow(Arrow *arrow)
112 {
113 arrows.append(arrow);
114 }
115 //! [3]
116
117 //! [4]
image() const118 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]
contextMenuEvent(QGraphicsSceneContextMenuEvent * event)132 void DiagramItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
133 {
134 scene()->clearSelection();
135 setSelected(true);
136 myContextMenu->exec(event->screenPos());
137 }
138 //! [5]
139
140 //! [6]
itemChange(GraphicsItemChange change,const QVariant & value)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]
153