Qt波形plotter代码

直接可用

plotter.h

#ifndef PLOTTER_H
#define PLOTTER_H

#include 
#include 
#include 
#include 

class QToolButton;
class PlotSettings;

class Plotter : public QWidget
{
    Q_OBJECT

public:
    Plotter(QWidget *parent = 0);

    void setPlotSettings(const PlotSettings &settings);
    void setCurveData(int id, const QVector &data);
    void clearCurve(int id);
    QSize minimumSizeHint() const;
    QSize sizeHint() const;

public slots:
    void zoomIn();
    void zoomOut();

protected:
    void paintEvent(QPaintEvent *event);
    void resizeEvent(QResizeEvent *event);
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);
    void keyPressEvent(QKeyEvent *event);
    void wheelEvent(QWheelEvent *event);

private:
    void updateRubberBandRegion();
    void refreshPixmap();
    void drawGrid(QPainter *painter);
    void drawCurves(QPainter *painter);

    enum { Margin = 50 };

    QToolButton *zoomInButton;
    QToolButton *zoomOutButton;
    QMap > curveMap;
    QVector zoomStack;
    int curZoom;
    bool rubberBandIsShown;
    QRect rubberBandRect;
    QPixmap pixmap;
};

class PlotSettings
{
public:
    PlotSettings();

    void scroll(int dx, int dy);
    void adjust();
    double spanX() const { return maxX - minX; }
    double spanY() const { return maxY - minY; }

    double minX;
    double maxX;
    int numXTicks;
    double minY;
    double maxY;
    QString TitleX;
    QString TitleY;
    int numYTicks;

private:
    static void adjustAxis(double &min, double &max, int &numTicks);
};

#endif

plotter.cpp

#include 
#include 
#include 
#include "plotter.h"
#include 
#include 
Plotter::Plotter(QWidget *parent)
    : QWidget(parent)
{
    this->setMaximumWidth(780);
    this->setStyleSheet("background:rgb(189,206,201)");
    this->setStyleSheet("background:rgb(255,255,255)");
    //setBackgroundRole(QPalette::Dark);
    setAutoFillBackground(true);
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    setFocusPolicy(Qt::StrongFocus);
    rubberBandIsShown = false;


    zoomInButton = new QToolButton(this);
    zoomInButton->setIcon(QIcon(":/new/image/zoomin.png")); //从资源中添加图片路径
    zoomInButton->adjustSize();
    connect(zoomInButton, SIGNAL(clicked()), this, SLOT(zoomIn()));

    zoomOutButton = new QToolButton(this);
    zoomOutButton->setIcon(QIcon(":/new/image/zoomout.png"));
    zoomOutButton->adjustSize();
    connect(zoomOutButton, SIGNAL(clicked()), this, SLOT(zoomOut()));

    setPlotSettings(PlotSettings());
}

void Plotter::setPlotSettings(const PlotSettings &settings)
{
    zoomStack.clear();
    zoomStack.append(settings);
    curZoom = 0;
    zoomInButton->hide();
    zoomOutButton->hide();
    refreshPixmap();
}

void Plotter::zoomOut()
{
    if (curZoom > 0) {
        --curZoom;
        zoomOutButton->setEnabled(curZoom > 0);
        zoomInButton->setEnabled(true);
        zoomInButton->show();
        refreshPixmap();
    }
}

void Plotter::zoomIn()
{
    if (curZoom < zoomStack.count() - 1) {
        ++curZoom;
        zoomInButton->setEnabled(curZoom < zoomStack.count() - 1);
        zoomOutButton->setEnabled(true);
        zoomOutButton->show();
        refreshPixmap();
    }
}

void Plotter::setCurveData(int id, const QVector &data)
{
    curveMap[id] = data;
    refreshPixmap();
}

void Plotter::clearCurve(int id)
{
    curveMap.remove(id);
    refreshPixmap();
}

QSize Plotter::minimumSizeHint() const
{
    return QSize(6 * Margin, 4 * Margin);
}

QSize Plotter::sizeHint() const
{
    return QSize(12 * Margin, 8 * Margin);
}

void Plotter::paintEvent(QPaintEvent * /* event */)
{
    QStylePainter painter(this);
    painter.drawPixmap(0, 0, pixmap);

    if (rubberBandIsShown) {
        painter.setPen(palette().light().color());
        painter.drawRect(rubberBandRect.normalized().adjusted(0, 0, -1, -1));
    }

    if (hasFocus()) {
        QStyleOptionFocusRect option;
        option.initFrom(this);
        option.backgroundColor = palette().dark().color();
        painter.drawPrimitive(QStyle::PE_FrameFocusRect, option);
    }
}

void Plotter::resizeEvent(QResizeEvent * /* event */)
{
    int x = width() - (zoomInButton->width()+ zoomOutButton->width() + 10);
    zoomInButton->move(x, 5);
    zoomOutButton->move(x + zoomInButton->width() + 5, 5);
    refreshPixmap();
}

void Plotter::mousePressEvent(QMouseEvent *event)
{
    QRect rect(Margin, Margin, width() - 2 * Margin, height() - 2 * Margin);

    if (event->button() == Qt::LeftButton) {
        if (rect.contains(event->pos())) {
            rubberBandIsShown = true;
            rubberBandRect.setTopLeft(event->pos());
            rubberBandRect.setBottomRight(event->pos());
            updateRubberBandRegion();
            setCursor(Qt::CrossCursor);
        }
    }
}

void Plotter::mouseMoveEvent(QMouseEvent *event)
{
    if (rubberBandIsShown) {
        updateRubberBandRegion();
        rubberBandRect.setBottomRight(event->pos());
        updateRubberBandRegion();
    }
}

void Plotter::mouseReleaseEvent(QMouseEvent *event)
{
    if ((event->button() == Qt::LeftButton) && rubberBandIsShown) {
        rubberBandIsShown = false;
        updateRubberBandRegion();
        unsetCursor();

        QRect rect = rubberBandRect.normalized();
        if (rect.width() < 4 || rect.height() < 4)
            return;
        rect.translate(-Margin, -Margin);

        PlotSettings prevSettings = zoomStack[curZoom];
        PlotSettings settings;
        double dx = prevSettings.spanX() / (width() - 2 * Margin);
        double dy = prevSettings.spanY() / (height() - 2 * Margin);
        settings.minX = prevSettings.minX + dx * rect.left();
        settings.maxX = prevSettings.minX + dx * rect.right();
        settings.minY = prevSettings.maxY - dy * rect.bottom();
        settings.maxY = prevSettings.maxY - dy * rect.top();
        settings.adjust();

        zoomStack.resize(curZoom + 1);
        zoomStack.append(settings);
        zoomIn();
    }
}

void Plotter::keyPressEvent(QKeyEvent *event)
{
    switch (event->key()) {
    case Qt::Key_Plus:
        zoomIn();
        break;
    case Qt::Key_Minus:
        zoomOut();
        break;
    case Qt::Key_Left:
        zoomStack[curZoom].scroll(-1, 0);
        refreshPixmap();
        break;
    case Qt::Key_Right:
        zoomStack[curZoom].scroll(+1, 0);
        refreshPixmap();
        break;
    case Qt::Key_Down:
        zoomStack[curZoom].scroll(0, -1);
        refreshPixmap();
        break;
    case Qt::Key_Up:
        zoomStack[curZoom].scroll(0, +1);
        refreshPixmap();
        break;
    default:
        QWidget::keyPressEvent(event);
    }
}

void Plotter::wheelEvent(QWheelEvent *event)
{
    int numDegrees = event->delta() / 8;
    int numTicks = numDegrees / 15;

    if (event->orientation() == Qt::Horizontal) {
        zoomStack[curZoom].scroll(numTicks, 0);
    } else {
        zoomStack[curZoom].scroll(0, numTicks);
    }
    refreshPixmap();
}

void Plotter::updateRubberBandRegion()
{
    QRect rect = rubberBandRect.normalized();
    update(rect.left(), rect.top(), rect.width(), 1);
    update(rect.left(), rect.top(), 1, rect.height());
    update(rect.left(), rect.bottom(), rect.width(), 1);
    update(rect.right(), rect.top(), 1, rect.height());
}

void Plotter::refreshPixmap()
{

    QPixmap pixmap1(":/new/image/empty.png");//加了一张空白图片
    pixmap = pixmap1.scaled(1450,699);//(1450,699)745,430

    //pixmap = QPixmap(":/new/image/zoomout.png");
    //pixmap.fill(this, 0, 0);//加了这句话this function is deprecated, ignored

    QPainter painter(&pixmap);
    painter.initFrom(this);
    drawGrid(&painter);
    drawCurves(&painter);
    update();
}

void Plotter::drawGrid(QPainter *painter)
{
    QRect rect(Margin, Margin, width() - 2 * Margin, height() - 2 * Margin);
    if (!rect.isValid())
        return;

    PlotSettings settings = zoomStack[curZoom];
    //QPen quiteDark = palette().dark().color();
    QPen quiteDark;
    quiteDark.setColor(QColor(0,0,0,255));
    QPen light = palette().light().color();

    for (int i = 0; i <= settings.numXTicks; ++i)
    {
        int x = rect.left() + (i * (rect.width() - 1)/ settings.numXTicks);
        double label = settings.minX + (i * settings.spanX()/ settings.numXTicks);
        painter->setPen(QPen(Qt::black, 1, Qt::DotLine));
        painter->drawLine(x, rect.top(), x, rect.bottom());//网格
        painter->setPen(QPen(Qt::black, 1, Qt::SolidLine));
        painter->drawLine(x, rect.bottom(), x, rect.bottom());//边框
        painter->drawText(x - 50, rect.bottom() + 5, 100, 20,Qt::AlignHCenter | Qt::AlignTop,QString::number(label));

    }
    for (int j = 0; j <= settings.numYTicks; ++j) {
        int y = rect.bottom() - (j * (rect.height() - 1)/ settings.numYTicks);
        double label = settings.minY + (j * settings.spanY()/ settings.numYTicks);
        painter->setPen(QPen(Qt::black, 1, Qt::DotLine));
        painter->drawLine(rect.left(), y, rect.right(), y);
        painter->setPen(QPen(Qt::black, 1, Qt::SolidLine));
        painter->drawLine(rect.left(), y, rect.left(), y);
        painter->drawText(rect.left() - Margin, y - 10, Margin - 5, 20,Qt::AlignRight | Qt::AlignVCenter,QString::number(label));
    }

    painter->drawText(rect.right()-60,rect.bottom()+40,settings.TitleX);
    painter->drawText(rect.left()-40,rect.top()-20,settings.TitleY);
    painter->drawRect(rect.adjusted(0, 0, -1, -1));
}

void Plotter::drawCurves(QPainter *painter)
{
    static const QColor colorForIds[6] = {
        Qt::red, Qt::green, Qt::blue, Qt::cyan, Qt::magenta, Qt::yellow
    };
    PlotSettings settings = zoomStack[curZoom];
    QRect rect(Margin, Margin,width() - 2 * Margin, height() - 2 * Margin);
    if (!rect.isValid())
        return;

    painter->setClipRect(rect.adjusted(+1, +1, -1, -1));

    QMapIterator > i(curveMap);
    while (i.hasNext()) {
        i.next();

        int id = i.key();
        QVector data = i.value();
        QPolygonF polyline(data.count());

        for (int j = 0; j < data.count(); ++j) {
            double dx = data[j].x() - settings.minX;
            double dy = data[j].y() - settings.minY;
            double x = rect.left() + (dx * (rect.width() - 1) / settings.spanX());
            double y = rect.bottom() - (dy * (rect.height() - 1)/ settings.spanY());
            polyline[j] = QPointF(x, y);
        }
        painter->setPen(colorForIds[uint(id) % 6]);
        painter->drawPolyline(polyline);
    }
}

PlotSettings::PlotSettings()
{
    minX = 0.0;
    maxX = 10.0;
    numXTicks = 10;

    minY = 0.0;
    maxY = 10.0;
    numYTicks = 10;
}

void PlotSettings::scroll(int dx, int dy)
{
    double stepX = spanX() / numXTicks;
    minX += dx * stepX;
    maxX += dx * stepX;

    double stepY = spanY() / numYTicks;
    minY += dy * stepY;
    maxY += dy * stepY;
}

void PlotSettings::adjust()
{
    adjustAxis(minX, maxX, numXTicks);
    adjustAxis(minY, maxY, numYTicks);
}

void PlotSettings::adjustAxis(double &min, double &max, int &numTicks)
{
    const int MinTicks = 4;
    double grossStep = (max - min) / MinTicks;
    double step = std::pow(10.0, std::floor(std::log10(grossStep)));

    if (5 * step < grossStep) {
        step *= 5;
    } else if (2 * step < grossStep) {
        step *= 2;
    }

    numTicks = int(std::ceil(max / step) - std::floor(min / step));
    if (numTicks < MinTicks)
        numTicks = MinTicks;
    min = std::floor(min / step) * step;
    max = std::ceil(max / step) * step;
}