一个实时波形图的封装demo（QT）（qcustomplot）

前言：

封装的一个实时波形图的类，可以直接提升使用。提供了接口，可以更改颜色，样式，等等

参考：

Qt Plotting Widget QCustomPlot - Introduction

另外参考了一个大神的作品，链接没找到。

项目文件：

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CSDN

【免费】一个实时波形图的封装demo（QT）（qcustomplot）资源-CSDN文库

源码

WaveChart文件夹：

1.加入文件qcustomplot.h 和 qcustomplot.cpp：

2.WaveChart.pri文件：

cpp 复制代码

QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport

FORMS += \
    $$PWD/waveWidget.ui

HEADERS += \
    $$PWD/qcustomplot.h \
    $$PWD/waveWidget.h

SOURCES += \
    $$PWD/qcustomplot.cpp \
    $$PWD/waveWidget.cpp

3.waveWidget.h文件：

cpp 复制代码

#ifndef WAVEWIDGET_H
#define WAVEWIDGET_H

#include <QWidget>
#include <QVBoxLayout>
#include <vector>
#include <cstring>
#include <numeric>
//#include <QScrollBar>
#include "qcustomplot.h"
using std::vector;
namespace Ui {
class WaveWidget;
}

class WaveWidget : public QWidget
{
    Q_OBJECT

public:
    explicit WaveWidget(QWidget *parent = nullptr);
    ~WaveWidget();

    void init(bool isShowTicks=true, bool isShowTickLables=true, bool isShowGrid=true, bool isShowSubGrid=true, bool isShowAxis2=true, bool isGraphBigAndSmall=true);
    void setTheme(QColor axis, QColor background);
    void setXAxisLable(const char* name, const char* name2 = "");
    void setYAxisLable(const char* name, const char* name2 = "");
    void setPen(Qt::GlobalColor penColor, QCPGraph::LineStyle lineStyle = QCPGraph::lsLine, QColor brushColor = QColor(255,255, 255, 100), bool isShow = true);
    void addNewData(double data);
    void setTitle(const char* name);

    double getMax();
    double getMin();
    double getAverage();

    QCustomPlot*    getTheChartPlot();
    QCPGraph*       getTheGraph();
    vector<double>  &getTheVector();

private:
    Ui::WaveWidget *ui;

    QCustomPlot*    chartPlot = new QCustomPlot(this);      // 图表
    QCPGraph*       graph;                                  // 曲线
    //QScrollBar      horizontalScrollBar;

    vector<double>  graphData;                              // 图表数据,只作记录使用
    int             timeRange = 10;                         // 时间轴范围
    QTime time;
    double          sum = 0.0;

};

#endif // WAVEWIDGET_H

4.waveWidget.cpp文件

cpp 复制代码

#include "waveWidget.h"
#include "ui_waveWidget.h"

WaveWidget::WaveWidget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::WaveWidget)
{
    ui->setupUi(this);

    // 初始化图表
    graph = chartPlot->addGraph();
    // graph->addData(1,1);
    // graph->addData(2,3);

    // 初始化设置
    // chartPlot->xAxis->setRange(1, 4096);
    // chartPlot->yAxis->setRange(-1, 350); // 假设灰度值的范围为0-255
    // chartPlot->xAxis->setLabel("Pixel");
    // chartPlot->yAxis->setLabel("Gray Value");

    QVBoxLayout* layout = new QVBoxLayout;
    layout->addWidget(ui->title);
    layout->addWidget(chartPlot);
    chartPlot->setSizePolicy(QSizePolicy::Policy(QSizePolicy::Preferred), QSizePolicy::Policy(QSizePolicy::Expanding));
    //layout->addWidget((QWidget)horizontalScrollBar);
    setLayout(layout);

    // init();


}

WaveWidget::~WaveWidget()
{
    delete ui;
}

void WaveWidget::init(bool isShowTicks, bool isShowTickLables, bool isShowGrid, bool isShowSubGrid, bool isShowAxis2, bool isGraphBigAndSmall)
{
    time = QTime::currentTime();
    // 刻度显示
    chartPlot->xAxis->setTicks(isShowTicks);
    chartPlot->yAxis->setTicks(isShowTicks);
    // 刻度值显示
    chartPlot->xAxis->setTickLabels(isShowTickLables);
    chartPlot->yAxis->setTickLabels(isShowTickLables);
    // 网格显示
    chartPlot->xAxis->grid()->setVisible(isShowGrid);
    chartPlot->yAxis->grid()->setVisible(isShowGrid);
    // 子网格显示
    chartPlot->xAxis->grid()->setSubGridVisible(isShowSubGrid);
    chartPlot->yAxis->grid()->setSubGridVisible(isShowSubGrid);
    // 右和上坐标轴、刻度值显示
    chartPlot->xAxis2->setVisible(isShowAxis2);
    chartPlot->yAxis2->setVisible(isShowAxis2);
    chartPlot->yAxis2->setTicks(isShowAxis2);
    chartPlot->yAxis2->setTickLabels(isShowAxis2);
    // make top right axes clones of bottom left axes. Looks prettier:
//    chartPlot->axisRect()->setupFullAxesBox();
    // make left and bottom axes always transfer their ranges to right and top axes:
    if(isShowAxis2){
        connect(chartPlot->xAxis, SIGNAL(rangeChanged(QCPRange)), chartPlot->xAxis2, SLOT(setRange(QCPRange)));
        connect(chartPlot->yAxis, SIGNAL(rangeChanged(QCPRange)), chartPlot->yAxis2, SLOT(setRange(QCPRange)));
    }

    // 暗色主题
    //setPlotTheme(Qt::white, Qt::black);
    // 亮色主题
    setTheme(Qt::black, Qt::white);
    if(isGraphBigAndSmall){
        // 可放大缩小和移动
        chartPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom);
    }

    // x轴以时间形式显示
    QSharedPointer<QCPAxisTickerTime> timeTicker(new QCPAxisTickerTime);
    timeTicker->setTimeFormat("%h:%m:%s");
    chartPlot->xAxis->setTicker(timeTicker);
    chartPlot->axisRect()->setupFullAxesBox();
    chartPlot->replot();
}

void WaveWidget::setTheme(QColor axis, QColor background)
{
//----------------------------------------------------------------------------------------//
    // 坐标标注颜色
    chartPlot->xAxis->setLabelColor(axis);
    chartPlot->yAxis->setLabelColor(axis);
    // 坐标刻度值颜色
    chartPlot->xAxis->setTickLabelColor(axis);
    chartPlot->yAxis->setTickLabelColor(axis);
    // 坐标基线颜色和宽度
    chartPlot->xAxis->setBasePen(QPen(axis, 1));
    chartPlot->yAxis->setBasePen(QPen(axis, 1));
    // 坐标主刻度颜色和宽度
    chartPlot->xAxis->setTickPen(QPen(axis, 1));
    chartPlot->yAxis->setTickPen(QPen(axis, 1));
    // 坐标子刻度颜色和宽度
    chartPlot->xAxis->setSubTickPen(QPen(axis, 1));
    chartPlot->yAxis->setSubTickPen(QPen(axis, 1));
    // 坐标标注颜色
    chartPlot->xAxis2->setLabelColor(axis);
    chartPlot->yAxis2->setLabelColor(axis);
    // 坐标刻度值颜色
    chartPlot->xAxis2->setTickLabelColor(axis);
    chartPlot->yAxis2->setTickLabelColor(axis);
    // 坐标基线颜色和宽度
    chartPlot->xAxis2->setBasePen(QPen(axis, 1));
    chartPlot->yAxis2->setBasePen(QPen(axis, 1));
    // 坐标主刻度颜色和宽度
    chartPlot->xAxis2->setTickPen(QPen(axis, 1));
    chartPlot->yAxis2->setTickPen(QPen(axis, 1));
    // 坐标子刻度颜色和宽度
    chartPlot->xAxis2->setSubTickPen(QPen(axis, 1));
    chartPlot->yAxis2->setSubTickPen(QPen(axis, 1));
    // 整个画布背景色
    chartPlot->setBackground(background);
    // 绘图区域背景色
    chartPlot->axisRect()->setBackground(background);
    // 刷新绘图
    chartPlot->replot();
}

void WaveWidget::setXAxisLable(const char *name, const char* name2)
{
    chartPlot->xAxis->setLabel(name);
    if(strlen(name2)!=0)
        chartPlot->xAxis2->setLabel(name2);

    chartPlot->replot();
}

void WaveWidget::setYAxisLable(const char *name, const char* name2)
{
    chartPlot->yAxis->setLabel(name);
    if(strlen(name2)!=0)
        chartPlot->yAxis2->setLabel(name2);

    chartPlot->replot();
}

void WaveWidget::setPen(Qt::GlobalColor penColor, QCPGraph::LineStyle lineStyle, QColor brushColor, bool isShow)
{
    graph->setPen(QPen(penColor)); // 设置线条颜色为蓝色
    graph->setLineStyle(lineStyle); // 设置线型为直线
    graph->setVisible(isShow);

    chartPlot->graph()->setBrush(QBrush(brushColor));

    chartPlot->replot();
}

void WaveWidget::addNewData(double data)
{
    // 系统当前时间 = 系统运行初始时间 + 系统运行时间
    static double start = time.hour()*60*60 + time.minute()*60 + time.second() + time.msec()/1000.0;
    double key = start + time.elapsed()/1000.0;

    // 设置时间轴
    chartPlot->xAxis->setRange(key, timeRange, Qt::AlignRight);
    //chartPlot->rescaleAxes();
    // 刷新绘图水平滚动条
    //horizontalScrollBar.setRange(int(start), int(key));  // 刷新滚动条的范围
    //horizontalScrollBar.setPageStep(1);                  // 设置翻页步长为 1s 的宽度
    //horizontalScrollBar.setValue(int(key));              // 调整滑块位置到最右边
    // 更新曲线绘图
    chartPlot->graph()->addData(key, data);
    chartPlot->replot(QCustomPlot::rpQueuedReplot);

    // 存储曲线的当前值
    graphData.push_back(data);
    sum += data;
}

void WaveWidget::setTitle(const char *name)
{
    ui->title->setText(name);
}

double WaveWidget::getMax()
{
    return *std::max_element(graphData.begin(),graphData.end());
}

double WaveWidget::getMin()
{
    return *std::min_element(graphData.begin(),graphData.end());
}

double WaveWidget::getAverage()
{
    return 1.0*sum/(graphData.size());
}

QCustomPlot *WaveWidget::getTheChartPlot()
{
    return   chartPlot;
}

QCPGraph *WaveWidget::getTheGraph()
{
    return  graph;
}

vector<double> &WaveWidget::getTheVector()
{
    return graphData;
}

5.测试demo：

新建测试界面：

提升为刚刚的类：

效果：

测试：

cpp 复制代码

    ui->setupUi(this);

    // 初始化：可以设置参数
    ui->waveWidget->init();

    // 可选设置：
    ui->waveWidget->setXAxisLable("Time");
    ui->waveWidget->setYAxisLable("Value");
    ui->waveWidget->setPen(Qt::blue, QCPGraph::lsLine, QColor( 36,141,218,255));
    ui->waveWidget->setTheme(Qt::red, Qt::white);
    ui->waveWidget->setTitle("Wave Chart Test");

    // 测试加入数据：
    QTimer *timer = new QTimer(this);
    connect(timer,&QTimer::timeout,[=](){
        ui->waveWidget->addNewData((qrand()%1000)/1000.0);
        qDebug()<<"max:"<<ui->waveWidget->getMax()<<"   min:"<<ui->waveWidget->getMin()<<"  average:"<<ui->waveWidget->getAverage();
        if(num%10==0){
            qDebug()<<"size: "<<ui->waveWidget->getTheVector().size();
            ui->waveWidget->getTheVector().clear();
            qDebug()<<"size: "<<ui->waveWidget->getTheVector().size()<<"********";
        }
        if(num>50){
            timer->stop();
        }
        num++;
    });
    timer->start(100);