/****************************************************************************
**
** Copyright (C) 2007-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include <QtGui>

#include "diagramitem.h"
#include "arrow.h"

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);
}

void DiagramItem::removeArrow(Arrow *arrow)
{
    int index = arrows.indexOf(arrow);

    if (index != -1)
        arrows.removeAt(index);
}

void DiagramItem::removeArrows()
{
    foreach (Arrow *arrow, arrows) {
        arrow->startItem()->removeArrow(arrow);
        arrow->endItem()->removeArrow(arrow);
        scene()->removeItem(arrow);
        delete arrow;
    }
}

void DiagramItem::addArrow(Arrow *arrow)
{
    arrows.append(arrow);
}

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;
}

void DiagramItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
    scene()->clearSelection();
    setSelected(true);
    myContextMenu->exec(event->screenPos());
}

QVariant DiagramItem::itemChange(GraphicsItemChange change,
                     const QVariant &value)
{
    if (change == QGraphicsItem::ItemPositionChange) {
        foreach (Arrow *arrow, arrows) {
            arrow->updatePosition();
        }
    }

    return value;
}
