graph2dmobile.cpp

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/*************************************************************************************
 *  Copyright (C) 2011 by Aleix Pol <aleixpol@kde.org>                               *
 *                                                                                   *
 *  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, write to the Free Software                      *
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA   *
 *************************************************************************************/

#include "graph2dmobile.h"
#include <QPainter>
#include <QStyleOption>
#include <QEvent>
#include <analitza/variables.h>
#include <analitzaplot/planecurve.h>
#include <analitzaplot/plotsmodel.h>
#include <analitzaplot/plotsfactory.h>
#include <KDebug>

using namespace Analitza;

Graph2DMobile::Graph2DMobile(QDeclarativeItem* parent)
    : QDeclarativeItem(parent), Plotter2D(boundingRect().size())
    , m_dirty(true), m_currentFunction(-1)
{
    setSize(QSizeF(100,100));
    setFlag(QGraphicsItem::ItemHasNoContents, false);
    
    defViewport = QRectF(QPointF(-10.0, 10.0), QSizeF(20.0, -20.0));
    resetViewport();
}

void Graph2DMobile::paint(QPainter* p, const QStyleOptionGraphicsItem* options, QWidget* )
{
//  qDebug() << "hellooo" << boundingRect();
    if(boundingRect().size().isEmpty())
        return;
    
    if(m_buffer.size()!=boundingRect().size()) {
        m_buffer = QPixmap(boundingRect().size().toSize());
        setPaintedSize(boundingRect().size().toSize());
    }
    
    Q_ASSERT(!m_buffer.isNull());
    
    if(m_dirty) {
        m_buffer.fill(Qt::transparent);
        drawGrid(&m_buffer);
        drawFunctions(&m_buffer);
        m_dirty=false;
    }
    
    p->drawPixmap(QPoint(0,0), m_buffer);
}

void Graph2DMobile::forceRepaint()
{
    m_dirty=true;
    update();
}

void Graph2DMobile::resetViewport()
{
    setViewport(defViewport);
}

void Graph2DMobile::modelChanged()
{
    connect(model(), SIGNAL(dataChanged( const QModelIndex&, const QModelIndex& )),
        this, SLOT(updateFuncs(const QModelIndex&, const QModelIndex)));
    connect(model(), SIGNAL( rowsInserted ( const QModelIndex &, int, int ) ),
        this, SLOT(addFuncs(const QModelIndex&, int, int)));
    connect(model(), SIGNAL( rowsRemoved ( const QModelIndex &, int, int ) ),
        this, SLOT(removeFuncs(const QModelIndex&, int, int)));
}

void Graph2DMobile::addFuncs(const QModelIndex& parent, int start, int end) { updateFunctions(parent, start, end); }

void Graph2DMobile::removeFuncs(const QModelIndex&, int, int) { forceRepaint(); }
void Graph2DMobile::updateFuncs(const QModelIndex& start, const QModelIndex& end) { updateFunctions(QModelIndex(), start.row(), end.row()); }

void Graph2DMobile::scale(qreal s, int x, int y)
{
    QRectF userViewport = lastUserViewport();
    if(s<1 || (userViewport.height() < -3. && userViewport.width() > 3.)) {
        scaleViewport(s, QPoint(x,y));
    }
}

void Graph2DMobile::translate(qreal x, qreal y)
{
    moveViewport(QPoint(x,y));
}

QColor randomFunctionColor() { return QColor::fromHsv(qrand()%255, 255, 225); }

QStringList Graph2DMobile::addFunction(const QString& expression, Analitza::Variables* vars)
{
    Analitza::Expression e(expression, Analitza::Expression::isMathML(expression));
    PlotsModel* plotsmodel = qobject_cast<PlotsModel*>(model());
    if(!plotsmodel)
        qWarning() << "only can add plots to a PlotsModel instance";
    QString fname;
    do {
        fname = plotsmodel->freeId();
    } while(vars && vars->contains(fname));
    QColor fcolor = randomFunctionColor();
    
    QStringList err;
    PlotBuilder req = PlotsFactory::self()->requestPlot(e, Dim2D, vars);
    if(req.canDraw()) {
        PlaneCurve* it = static_cast<PlaneCurve*>(req.create(fcolor, fname));
        
        if(it->isCorrect())
            plotsmodel->addPlot(it);
        else {
            err = it->errors();
            delete it;
        }
    }
    
    return err;
}