plot.cpp

Go to the documentation of this file.

//=============================================================================================================
 
//=============================================================================================================
// 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) {
            // Replace the curves; title and axis labels stay
            m_qListVecPointFPaths.clear();
            m_dMinX = 0;
            m_dMaxX = 0;
            m_dMinY = 0;
            m_dMaxY = 0;
        }
 
        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 --: x from min to max over the width, y upwards over 90 % of the height
        QPen pen;
        pen.setWidth(1);
        pen.setBrush(Qt::blue);
        painter.setPen(pen);
        const double rangeX = m_dMaxX > m_dMinX ? m_dMaxX - m_dMinX : 1.0;
        const double rangeY = m_dMaxY > m_dMinY ? m_dMaxY - m_dMinY : 1.0;
        const double scale_x = t_qSizePlot.width() / rangeX;
        const double scale_y = 0.9 * t_qSizePlot.height() / rangeY;
        const double bottom = t_qPointTopLeft.y() + 0.95 * t_qSizePlot.height();
        for (const QVector<QPointF>& path : std::as_const(m_qListVecPointFPaths)) {
            for (qsizetype k = 1; k < path.size(); ++k) {
                painter.drawLine(QPointF(t_qPointTopLeft.x() + (path[k - 1].x() - m_dMinX) * scale_x, bottom - (path[k - 1].y() - m_dMinY) * scale_y),
                                 QPointF(t_qPointTopLeft.x() + (path[k].x() - m_dMinX) * scale_x, bottom - (path[k].y() - m_dMinY) * scale_y));
            }
        }
        painter.end();
 
        //Draw title & axes
        Graph::drawLabels(t_qSizePlot.width(), t_qSizePlot.height());
    }
}