QFD2/QFD/view/PlotView.cpp

#include "PlotView.h"

#include "qcustomplot/CustomHistogramBars.h"
#include "qcustomplot/SmoothCurveGraph.h"

#include <QPainter>

PlotView::PlotView(PlotType t, const QVector<Data> &data, const QString &title, QWidget *parent)
    : QCustomPlot(parent), m_plotType(t), m_sourceData(data), m_title(title)
{
}

void PlotView::updateType(PlotView::PlotType t)
{
    m_plotType = t;
    plot();
}

void PlotView::updateData(const QVector<PlotView::Data> &data)
{
    m_sourceData = data;
    plot();
}

QPixmap PlotView::toPixmap()
{
    QPixmap pixmap(this->size());
    pixmap.fill(Qt::transparent);
    this->render(&pixmap);
    return pixmap;
}

void PlotView::plot()
{
    this->clearGraphs();
    switch (m_plotType) {
    case Line:
        drawLine();
        break;
    case HistogramHorizontal:
        drawHistogram(true);
        break;

    case HistogramVertical:
        drawHistogram(false);
        break;

    case Curve:
        drawCurve();
        break;

    case Area:
        drawArea();
        break;

    default:
        break;
    }
}

void PlotView::drawLine()
{
    this->legend->setVisible(true);
    this->legend->setFont(QFont("微软雅黑", 9));
    this->legend->setRowSpacing(-3);
    QVector<QCPScatterStyle::ScatterShape> shapes;
    shapes << QCPScatterStyle::ssDot;
    shapes << QCPScatterStyle::ssCross;
    shapes << QCPScatterStyle::ssPlus;
    shapes << QCPScatterStyle::ssCircle;
    shapes << QCPScatterStyle::ssDisc;
    shapes << QCPScatterStyle::ssSquare;
    shapes << QCPScatterStyle::ssDiamond;
    shapes << QCPScatterStyle::ssStar;
    shapes << QCPScatterStyle::ssTriangle;
    shapes << QCPScatterStyle::ssTriangleInverted;
    shapes << QCPScatterStyle::ssCrossSquare;
    shapes << QCPScatterStyle::ssPlusSquare;
    shapes << QCPScatterStyle::ssCrossCircle;
    shapes << QCPScatterStyle::ssPlusCircle;
    shapes << QCPScatterStyle::ssPeace;
    shapes << QCPScatterStyle::ssCustom;

    QPen pen;

    for (int i = 0; i < m_sourceData.size(); i++) {
        this->addGraph();
        pen.setColor(
                QColor(qSin(i * 0.3) * 100 + 100, qSin(i * 0.6 + 0.7) * 100 + 100, qSin(i * 0.4 + 0.6) * 100 + 100));
        // generate data:
        QVector<double> x, y;
        x << 0 << 1;
        y << 0 << m_sourceData.at(i).value;

        this->graph()->setData(x, y);
        this->graph()->rescaleAxes(true);
        this->graph()->setPen(pen);
        this->graph()->setName(m_sourceData.at(i).name);
        this->graph()->setLineStyle(QCPGraph::lsLine);
        // set scatter style:
        if (shapes.at(i % shapes.size()) != QCPScatterStyle::ssCustom) {
            this->graph()->setScatterStyle(QCPScatterStyle(shapes.at(i % shapes.size()), 10));
        } else {
            QPainterPath customScatterPath;
            for (int i = 0; i < 3; ++i)
                customScatterPath.cubicTo(qCos(2 * M_PI * i / 3.0) * 9, qSin(2 * M_PI * i / 3.0) * 9,
                                          qCos(2 * M_PI * (i + 0.9) / 3.0) * 9, qSin(2 * M_PI * (i + 0.9) / 3.0) * 9, 0,
                                          0);
            this->graph()->setScatterStyle(
                    QCPScatterStyle(customScatterPath, QPen(Qt::black, 0), QColor(40, 70, 255, 50), 10));
        }
    }

    // set blank axis lines:
    this->rescaleAxes();
    this->xAxis->setTicks(false);
    this->yAxis->setTicks(true);
    this->xAxis->setTickLabels(false);
    this->yAxis->setTickLabels(true);
    if (!m_title.isEmpty()) {
        this->xAxis->setLabel(m_title);
    }
    // set axis ranges to show all data:
    this->xAxis->setRange(0, 1.2);
    this->yAxis->setRange(0, 2);

    // make top right axes clones of bottom left axes:
    this->axisRect()->setupFullAxesBox();

    // make left and bottom axes always transfer their ranges to right and top axes:
    connect(this->xAxis, SIGNAL(rangeChanged(QCPRange)), this->xAxis2, SLOT(setRange(QCPRange)));
    connect(this->yAxis, SIGNAL(rangeChanged(QCPRange)), this->yAxis2, SLOT(setRange(QCPRange)));

    // Note: we could have also just called customPlot->rescaleAxes(); instead
    // Allow user to drag axis ranges with mouse, zoom with mouse wheel and select graphs by clicking:
    this->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom | QCP::iSelectPlottables);

    this->replot();
}

void PlotView::drawHistogram(bool horizontal)
{
    QCPAxis *keyAxis   = nullptr;
    QCPAxis *valueAxis = nullptr;
    if (horizontal) {
        keyAxis   = this->yAxis;
        valueAxis = this->xAxis;
    } else {
        keyAxis   = this->xAxis;
        valueAxis = this->yAxis;
    }
    //    QCPBars *fossil    = new QCPBars(keyAxis, valueAxis);  // 使用xAxis作为柱状图的key轴，yAxis作为value轴
    CustomHistogramBars *fossil = new CustomHistogramBars(keyAxis, valueAxis);

    fossil->setAntialiased(false);                           // 为了更好的边框效果，关闭抗齿锯
    fossil->setName("Fossil fuels");                         // 设置柱状图的名字，可在图例中显示
    fossil->setPen(QPen(QColor(0, 168, 140).lighter(130)));  // 设置柱状图的边框颜色
    fossil->setBrush(QColor(0, 168, 140));                   // 设置柱状图的画刷颜色

    // 为柱状图设置一个文字类型的key轴，ticks决定了轴的范围，而labels决定了轴的刻度文字的显示
    QVector<double> ticks;
    QVector<QString> labels;
    QVector<double> fossilData;
    double maxValue = 0;
    for (int i = 0; i < m_sourceData.size(); ++i) {
        ticks << i + 1;
        labels << m_sourceData.at(i).name;
        fossilData << m_sourceData.at(i).value;
        maxValue = qMax(maxValue, m_sourceData.at(i).value);
    }

    QSharedPointer<QCPAxisTickerText> textTicker(new QCPAxisTickerText);
    textTicker->addTicks(ticks, labels);

    keyAxis->setTicker(textTicker);  // 设置为文字轴

    keyAxis->setTickLabelRotation(horizontal ? 15 : 75);  // 轴刻度文字旋转60度
    keyAxis->setSubTicks(false);                          // 不显示子刻度
    keyAxis->setTickLength(0, 4);  // 轴内外刻度的长度分别是0,4,也就是轴内的刻度线不显示
    keyAxis->setRange(0, ticks.size() + 2);  // 设置范围
    keyAxis->setUpperEnding(QCPLineEnding::esSpikeArrow);

    if (!m_title.isEmpty()) {
        keyAxis->setLabel(m_title);
    }

    valueAxis->setRange(0, 1.1 * maxValue);
    valueAxis->setPadding(35);  // 轴的内边距，可以到QCustomPlot之开始（一）看图解
    valueAxis->setUpperEnding(QCPLineEnding::esSpikeArrow);
    fossil->setData(ticks, fossilData);

    this->replot();
}

void PlotView::drawCurve()
{
    QCPAxis *keyAxis   = this->xAxis;
    QCPAxis *valueAxis = this->yAxis;

    SmoothCurveGraph *scGraph = new SmoothCurveGraph(keyAxis, valueAxis);

    scGraph->setPen(QPen(Qt::blue));  // line color blue for first graph

    QVector<double> x, y;
    QVector<QString> labels;
    for (int i = 0; i < m_sourceData.size(); ++i) {
        x << i + 1;
        y << m_sourceData.at(i).value;
        labels << m_sourceData.at(i).name;
    }
    // configure right and top axis to show ticks but no labels:
    // (see QCPAxisRect::setupFullAxesBox for a quicker method to do this)
    this->xAxis2->setVisible(true);
    this->xAxis2->setTickLabels(false);
    this->yAxis2->setVisible(true);
    this->yAxis2->setTickLabels(false);
    // make left and bottom axes always transfer their ranges to right and top axes:
    connect(this->xAxis, SIGNAL(rangeChanged(QCPRange)), this->xAxis2, SLOT(setRange(QCPRange)));
    connect(this->yAxis, SIGNAL(rangeChanged(QCPRange)), this->yAxis2, SLOT(setRange(QCPRange)));
    // pass data points to graphs:
    scGraph->setData(x, y);
    scGraph->setScatterStyle(QCPScatterStyle(QCPScatterStyle::ssCross, QColor(Qt::red), QColor(Qt::white), 4));

    QSharedPointer<QCPAxisTickerText> textTicker(new QCPAxisTickerText);
    textTicker->addTicks(x, labels);

    keyAxis->setTicker(textTicker);  // 设置为文字轴

    keyAxis->setTickLabelRotation(75);   // 轴刻度文字旋转60度
    keyAxis->setSubTicks(false);         // 不显示子刻度
    keyAxis->setTickLength(0, 4);        // 轴内外刻度的长度分别是0,4,也就是轴内的刻度线不显示
    keyAxis->setRange(0, x.size() + 2);  // 设置范围
    keyAxis->setUpperEnding(QCPLineEnding::esSpikeArrow);

    if (!m_title.isEmpty()) {
        keyAxis->setLabel(m_title);
    }

    // let the ranges scale themselves so graph 0 fits perfectly in the visible area:
    scGraph->rescaleAxes();
    // Note: we could have also just called customPlot->rescaleAxes(); instead
    // Allow user to drag axis ranges with mouse, zoom with mouse wheel and select graphs by clicking:
    this->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom | QCP::iSelectPlottables);

    this->replot();
}

void PlotView::drawArea()
{
    // create multiple graphs:
    for (int gi = 0; gi < m_sourceData.size(); ++gi) {
        this->addGraph();
        QColor color(20 + 200 / m_sourceData.size() * gi, 70 * (1.6 - gi / m_sourceData.size()), 150, 150);
        this->graph()->setLineStyle(QCPGraph::lsLine);
        this->graph()->setPen(QPen(color.lighter(200)));
        this->graph()->setBrush(QBrush(color));
        this->graph()->setName(m_sourceData.at(gi).name);
        this->graph()->setScatterStyle(
                QCPScatterStyle(QCPScatterStyle::ssCross, QColor(Qt::blue), QColor(Qt::white), 4));
        // generate random walk data:
        QVector<QCPGraphData> timeData(2);
        timeData[0].key   = 0;
        timeData[0].value = 0;
        timeData[1].key   = 1;
        timeData[1].value = m_sourceData.at(gi).value;
        this->graph()->data()->set(timeData);
    }

    // set axis labels:
    if (!m_title.isEmpty()) {
        this->xAxis->setLabel(m_title);
    }

    this->xAxis->setTicks(false);
    this->yAxis->setTicks(true);
    this->xAxis->setTickLabels(false);
    this->yAxis->setTickLabels(true);
    // set axis ranges to show all data:
    this->xAxis->setRange(0, 1.2);
    this->yAxis->setRange(0, 2);

    // make left and bottom axes always transfer their ranges to right and top axes:
    connect(this->xAxis, SIGNAL(rangeChanged(QCPRange)), this->xAxis2, SLOT(setRange(QCPRange)));
    connect(this->yAxis, SIGNAL(rangeChanged(QCPRange)), this->yAxis2, SLOT(setRange(QCPRange)));

    // show legend with slightly transparent background brush:
    this->legend->setVisible(true);
    this->legend->setFont(QFont("微软雅黑", 9));
    this->legend->setRowSpacing(-3);
    this->legend->setBrush(QColor(255, 255, 255, 150));

    // let the ranges scale themselves so graph 0 fits perfectly in the visible area:
    //    this->rescaleAxes();
    // Note: we could have also just called customPlot->rescaleAxes(); instead
    // Allow user to drag axis ranges with mouse, zoom with mouse wheel and select graphs by clicking:
    this->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom | QCP::iSelectPlottables);

    this->replot();
}