RetroShare/plugins/qdiagram_plugin/diagramitem.cpp

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#include <QtGui>

#include "diagramitem.h"

//! [0]
DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu,
             QGraphicsItem *parent, QGraphicsScene *scene)
    : QGraphicsPolygonItem(parent, scene)
{
    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);
}

DiagramItem::DiagramItem(QMenu *contextMenu,
             QGraphicsItem *parent, QGraphicsScene *scene)
    : QGraphicsPolygonItem(parent, scene)
{
    myDiagramType = None;
    myContextMenu = contextMenu;

    setFlag(QGraphicsItem::ItemIsMovable, true);
    setFlag(QGraphicsItem::ItemIsSelectable, true);
}
//! [0]
DiagramItem::DiagramItem(const DiagramItem& diagram)
{
	QGraphicsPolygonItem(diagram.parentItem(),diagram.scene());
	//QGraphicsPolygonItem(static_cast<QGraphicsPolygonItem>(diagram));
	// copy from general GraphcsItem
	setBrush(diagram.brush());
	setPen(diagram.pen());
	setTransform(diagram.transform());

	// copy DiagramItem
	myDiagramType = diagram.myDiagramType;
	myContextMenu = diagram.myContextMenu;

	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);
}


//! [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) {
        ;
    }

    return value;
}
//! [6]
DiagramItem* DiagramItem::copy()
{
    DiagramItem* newDiagramItem=new DiagramItem(*this);
    return newDiagramItem;
}