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#include <QtGui>

#include "diagramitem.h"

#include "arrow.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);

}

//! [0]

//! [1]

void DiagramItem::removeArrow(Arrow *arrow)

{

    int index = arrows.indexOf(arrow);

    if (index != -1)

        arrows.removeAt(index);

}

//! [1]

//! [2]

void DiagramItem::removeArrows()

{

    foreach (Arrow *arrow, arrows) {

        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) {

        foreach (Arrow *arrow, arrows) {

            arrow->updatePosition();

        }

    }

    return value;

}

//! [6]