QCustomPlot使用心得一：安裝和使用

轉自：https://blog.csdn.net/yxy244/article/details/99671911

QCustomPlot是一個基於Qt C++的圖形庫，用於繪制和數據可視化 - 制作漂亮的2D圖 - 曲線圖、趨勢圖、坐標圖、柱狀圖等。

有詳細的例程和幫助文檔，使用方便。

一、下載

到官網https://www.qcustomplot.com/index.php/download下載最新版本

二、安裝幫助文檔

1.下載后解壓，有如下文檔

（1）幫助文檔：documentation

（2）例程：examples

（3）源文件：qcustomplot.cpp和qcustomplot.h

2.將幫助文檔qcustomplot.qch，復制到QT目錄下，例如E:\Qt\Docs\Qt-5.13.0（根據自己QT的安裝位置）

3.打開QT，工具->選項->幫助->添加

 

4.選擇qcustomplot.qch，幫助文檔就安裝好了

 

三、測試

1.新建工程，customplot.cpp和qcustomplot.h復制到工程文件里，並在項目里qcustomplot.cpp和qcustomplot.h添加進來，.pro里添加

QT       += printsupport

 

 

2.打開.ui文件，拖入一個widget控件，右鍵提升

3.輸入QcustomPlot，點添加，再點提升，編譯一下，看有沒錯誤。

4.在構造函數里添加測試代碼

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    QCustomPlot* customPlot  = ui->customPlot;
    // add two new graphs and set their look:
    customPlot->addGraph();
    customPlot->graph(0)->setPen(QPen(Qt::blue)); // line color blue for first graph
    customPlot->graph(0)->setBrush(QBrush(QColor(0, 0, 255, 20))); // first graph will be filled with translucent blue
    customPlot->addGraph();
    customPlot->graph(1)->setPen(QPen(Qt::red)); // line color red for second graph
    // generate some points of data (y0 for first, y1 for second graph):
    QVector<double> x(251), y0(251), y1(251);
    for (int i=0; i<251; ++i)
    {
      x[i] = i;
      y0[i] = qExp(-i/150.0)*qCos(i/10.0); // exponentially decaying cosine
      y1[i] = qExp(-i/150.0);              // exponential envelope
    }
    // configure right and top axis to show ticks but no labels:
    // (see QCPAxisRect::setupFullAxesBox for a quicker method to do this)
    customPlot->xAxis2->setVisible(true);
    customPlot->xAxis2->setTickLabels(false);
    customPlot->yAxis2->setVisible(true);
    customPlot->yAxis2->setTickLabels(false);
    // make left and bottom axes always transfer their ranges to right and top axes:
    connect(customPlot->xAxis, SIGNAL(rangeChanged(QCPRange)), customPlot->xAxis2, SLOT(setRange(QCPRange)));
    connect(customPlot->yAxis, SIGNAL(rangeChanged(QCPRange)), customPlot->yAxis2, SLOT(setRange(QCPRange)));
    // pass data points to graphs:
    customPlot->graph(0)->setData(x, y0);
    customPlot->graph(1)->setData(x, y1);
    // let the ranges scale themselves so graph 0 fits perfectly in the visible area:
    customPlot->graph(0)->rescaleAxes();
    // same thing for graph 1, but only enlarge ranges (in case graph 1 is smaller than graph 0):
    customPlot->graph(1)->rescaleAxes(true);
    // 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:
    customPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom | QCP::iSelectPlottables);
}

 

5.運行，沒錯誤能看到如下波形。