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| |
| #include "diagramitem.h" |
| #include "arrow.h" |
| |
| #include <QGraphicsScene> |
| #include <QGraphicsSceneContextMenuEvent> |
| #include <QMenu> |
| #include <QPainter> |
| |
| //! [0] |
| DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu, |
| QGraphicsItem *parent) |
| : QGraphicsPolygonItem(parent), myDiagramType(diagramType) |
| , myContextMenu(contextMenu) |
| { |
| QPainterPath path; |
| switch (myDiagramType) { |
| case StartEnd: |
| path.moveTo(200, 50); |
| path.arcTo(150, 0, 50, 50, 0, 90); |
| path.arcTo(50, 0, 50, 50, 90, 90); |
| path.arcTo(50, 50, 50, 50, 180, 90); |
| path.arcTo(150, 50, 50, 50, 270, 90); |
| path.lineTo(200, 25); |
| myPolygon = path.toFillPolygon(); |
| break; |
| case Conditional: |
| myPolygon << QPointF(-100, 0) << QPointF(0, 100) |
| << QPointF(100, 0) << QPointF(0, -100) |
| << QPointF(-100, 0); |
| break; |
| case Step: |
| myPolygon << QPointF(-100, -100) << QPointF(100, -100) |
| << QPointF(100, 100) << QPointF(-100, 100) |
| << QPointF(-100, -100); |
| break; |
| default: |
| myPolygon << QPointF(-120, -80) << QPointF(-70, 80) |
| << QPointF(120, 80) << QPointF(70, -80) |
| << QPointF(-120, -80); |
| break; |
| } |
| setPolygon(myPolygon); |
| setFlag(QGraphicsItem::ItemIsMovable, true); |
| setFlag(QGraphicsItem::ItemIsSelectable, true); |
| setFlag(QGraphicsItem::ItemSendsGeometryChanges, true); |
| } |
| //! [0] |
| |
| //! [1] |
| void DiagramItem::removeArrow(Arrow *arrow) |
| { |
| arrows.removeAll(arrow); |
| } |
| //! [1] |
| |
| //! [2] |
| void DiagramItem::removeArrows() |
| { |
| // need a copy here since removeArrow() will |
| // modify the arrows container |
| const auto arrowsCopy = arrows; |
| for (Arrow *arrow : arrowsCopy) { |
| arrow->startItem()->removeArrow(arrow); |
| arrow->endItem()->removeArrow(arrow); |
| scene()->removeItem(arrow); |
| delete arrow; |
| } |
| } |
| //! [2] |
| |
| //! [3] |
| void DiagramItem::addArrow(Arrow *arrow) |
| { |
| arrows.append(arrow); |
| } |
| //! [3] |
| |
| //! [4] |
| QPixmap DiagramItem::image() const |
| { |
| QPixmap pixmap(250, 250); |
| pixmap.fill(Qt::transparent); |
| QPainter painter(&pixmap); |
| painter.setPen(QPen(Qt::black, 8)); |
| painter.translate(125, 125); |
| painter.drawPolyline(myPolygon); |
| |
| return pixmap; |
| } |
| //! [4] |
| |
| //! [5] |
| void DiagramItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event) |
| { |
| scene()->clearSelection(); |
| setSelected(true); |
| myContextMenu->exec(event->screenPos()); |
| } |
| //! [5] |
| |
| //! [6] |
| QVariant DiagramItem::itemChange(GraphicsItemChange change, const QVariant &value) |
| { |
| if (change == QGraphicsItem::ItemPositionChange) { |
| for (Arrow *arrow : qAsConst(arrows)) |
| arrow->updatePosition(); |
| } |
| |
| return value; |
| } |
| //! [6] |