plot.cpp

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//=============================================================================================================
 
//=============================================================================================================
// INCLUDES
//=============================================================================================================
 
#include "plot.h"
 
//=============================================================================================================
// QT INCLUDES
//=============================================================================================================
 
#include <QPoint>
#include <QPainter>
 
//=============================================================================================================
// USED NAMESPACES
//=============================================================================================================
 
using namespace DISPLIB;
using namespace Eigen;
 
//=============================================================================================================
// DEFINE MEMBER METHODS
//=============================================================================================================
 
Plot::Plot(QWidget* parent)
: Graph(parent)
, m_bHoldOn(false)
{
    init();
}
 
//=============================================================================================================
 
Plot::Plot(VectorXd& p_dVec, QWidget* parent)
: Graph(parent)
, m_bHoldOn(false)
{
    init();
    updateData(p_dVec);
}
 
//=============================================================================================================
 
Plot::~Plot()
{
}
 
//=============================================================================================================
 
void Plot::init()
{
    //Parent init
    Graph::init();
 
    m_qListVecPointFPaths.clear();
 
    m_dMinX = 0;
    m_dMaxX = 0;
    m_dMinY = 0;
    m_dMaxY = 0;
}
 
//=============================================================================================================
 
void Plot::updateData(VectorXd& p_dVec)
{
    if (p_dVec.size() > 0) {
        if (!m_bHoldOn)
            init();
 
        QVector<QPointF> t_qVecPointFPaths;
        //No X data given
        m_dMinX = 0 < m_dMinX ? 0 : m_dMinX;
        m_dMaxX = p_dVec.size() - 1 > m_dMaxX ? p_dVec.size() - 1 : m_dMaxX;
 
        m_dMinY = p_dVec.minCoeff() < m_dMinY ? p_dVec.minCoeff() : m_dMinY;
        m_dMaxY = p_dVec.maxCoeff() > m_dMaxY ? p_dVec.maxCoeff() : m_dMaxY;
 
        double t_dX = 0;
        for (qint32 i = 0; i < p_dVec.size(); ++i) {
            t_qVecPointFPaths.append(QPointF(t_dX, p_dVec[i]));
            t_dX += 1;
        }
 
        m_qListVecPointFPaths.append(t_qVecPointFPaths);
 
        update();
    }
}
 
//=============================================================================================================
 
void Plot::paintEvent(QPaintEvent* event)
{
    Q_UNUSED(event);
 
    //
    // The painter used for the drawing below is constructed inside the block.
    // A second one was also being constructed here and never used, which means
    // two QPainters were active on this widget at once - Qt only allows one.
    //
    if (m_qListVecPointFPaths.size() > 0) {
        QPoint t_qPointTopLeft(m_iBorderLeftRight, m_iBorderTopBottom);
 
        QSize t_qSizePlot = m_qSizeWidget;
 
        t_qSizePlot.setWidth(t_qSizePlot.width() - 2 * m_iBorderLeftRight);
        t_qSizePlot.setHeight(t_qSizePlot.height() - 2 * m_iBorderTopBottom);
 
        //Draw background
        QPainter painter(this);
        painter.fillRect(t_qPointTopLeft.x(), t_qPointTopLeft.y(), t_qSizePlot.width(), t_qSizePlot.height(), Qt::white);
 
        //Draw border
        painter.drawRect(t_qPointTopLeft.x() - 1, t_qPointTopLeft.y() - 1, t_qSizePlot.width() + 1, t_qSizePlot.height() + 1);
 
        // -- Data --
        painter.save();
        QPen pen;
        pen.setWidth(1);
        pen.setBrush(Qt::blue);
        painter.setPen(pen);
        painter.translate(m_iBorderLeftRight - m_dMinX, m_iBorderTopBottom + t_qSizePlot.height() / 2);
        for (qint32 i = 0; i < m_qListVecPointFPaths.size(); ++i) {
            double scale_x = t_qSizePlot.width() / (m_dMaxX - m_dMinX);
            double scale_y = (t_qSizePlot.height() - (t_qSizePlot.height() * 0.1)) / (m_dMaxY - m_dMinY);
 
            //scale
            QVector<QPointF> t_qVecPointFPath;
            QVector<QPointF>::ConstIterator it;
            for (it = m_qListVecPointFPaths[i].begin(); it != m_qListVecPointFPaths[i].end(); ++it)
                t_qVecPointFPath.append(QPointF(it->x() * scale_x, it->y() * scale_y));
 
            //draw
            for (it = t_qVecPointFPath.begin() + 1; it != t_qVecPointFPath.end(); ++it)
                painter.drawLine(*(it - 1), *it);
        }
        painter.restore();
 
        //Draw title & axes
        Graph::drawLabels(t_qSizePlot.width(), t_qSizePlot.height());
    }
}