elementitem.cpp

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/*
 * Copyright 2009 Mathias Kraus <k.hias@gmx.de>
 * Copyright 2007-2008 Thomas Gallinari <tg8187@yahoo.fr>
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of 
 * the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "elementitem.h"
#include "element.h"

#include <QGraphicsView>

#include <KGameRenderer>

ElementItem::ElementItem(Element* p_model, KGameRenderer* renderer) : KGameRenderedItem(renderer, "")
{
    m_model = p_model;
    // Init the view coordinates
    update(p_model->getX(), p_model->getY());
    // Connects the model to the view
    connect(p_model, SIGNAL(moved(qreal,qreal)), this, SLOT(update(qreal,qreal)));
    
    m_renderSize = QSize(1, 1);
    m_itemSizeSet = QSize(Granatier::CellSize, Granatier::CellSize);
    m_itemSizeReal = m_itemSizeSet;
}

ElementItem::~ElementItem()
{
}

Element* ElementItem::getModel() const
{
    return m_model;
}

QPainterPath ElementItem::shape() const
{
    QPainterPath path;
    path.addEllipse(boundingRect());
    return path;
}

void ElementItem::update(qreal p_x, qreal p_y)
{
    // Compute the top-right coordinates of the item
    qreal x = p_x - m_itemSizeSet.width() / 2;
    qreal y = p_y - m_itemSizeSet.height() / 2;

    // Updates the view coordinates
    setPos(x, y);
}

void ElementItem::updateGraphics(qreal svgScaleFactor)
{
    updateGraphicsInternal(svgScaleFactor);
}

void ElementItem::updateGraphicsInternal(qreal svgScaleFactor)
{
    if(scene()->views().isEmpty())
    {
        return;
    }
    
    //calculate the size of the item on the view
    QPoint viewTopLeft = scene()->views().first()->mapFromScene(0, 0);
    QPoint viewBottomRight = scene()->views().first()->mapFromScene(m_itemSizeSet.width(), m_itemSizeSet.height());
    
    int viewWidth = viewBottomRight.x() - viewTopLeft.x();
    int viewHeight = viewBottomRight.y() - viewTopLeft.y();
    
    //for better alignment, if the item size is different from the cell size, make the difference between the cell size and item size always even
    if(m_itemSizeSet.width() != Granatier::CellSize || m_itemSizeSet.height() != Granatier::CellSize)
    {
        viewBottomRight = scene()->views().first()->mapFromScene(Granatier::CellSize, Granatier::CellSize);
        int viewCellWidth = viewBottomRight.x() - viewTopLeft.x();
        int viewCellHeight = viewBottomRight.y() - viewTopLeft.y();
        if((viewCellWidth - viewWidth) % 2 != 0)
        {
            viewWidth--;
        }
        if((viewCellHeight - viewHeight) % 2 != 0)
        {
            viewHeight--;
        }
        
        //calculate the real item size after change of the render size
        QPointF sceneTopLeft = scene()->views().first()->mapToScene(0, 0);
        QPointF sceneBottomRight = scene()->views().first()->mapToScene(viewWidth, viewHeight);
        
        qreal sceneWidth = sceneBottomRight.x() - sceneTopLeft.x();
        qreal sceneHeight = sceneBottomRight.y() - sceneTopLeft.y();
        m_itemSizeReal = QSize(sceneWidth, sceneHeight);
    }
    
    setRenderSize(QSize(viewWidth, viewHeight));
    setScale(svgScaleFactor);
    m_renderSize = renderSize();
}