QT绘制曲线图 QCustomplot 的简单使用手册

//在项目中添加qcustomplot.h 与 qcustomplot.cpp，并在.pro文件中添加QT += widgets printsupport 这是因为qcustomplot基于图片输出功能
//头文件定义了QCustomPlot *m_QcustomPlot；
//头文件包含了#include “qcustomplot.h”
qcustomplot类CSDN下载链接
qcustomplot类官网下载地址

#include "mainwindow.h"
#include 
#include 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
        m_QcustomPlot = new QCustomPlot;

     //也可先用widget布局好后再加入
     setCentralWidget(m_QcustomPlot);

     //设置样式，拖拽、缩小、是否可选中
     m_QcustomPlot->setInteractions(QCP::iRangeDrag/*拖拽*/ | QCP::iRangeZoom/*缩小*/ | QCP::iSelectAxes |QCP::iSelectLegend | QCP::iSelectPlottables);
     m_QcustomPlot->axisRect()->setupFullAxesBox(false);//设置四周全轴框
     m_QcustomPlot->addGraph(); //添加曲线，每加入一条曲线需调用一次
     QVector vecX, vecY;//横坐标值、纵坐标值
     vecX<<1<<2<<3<<4<<15;
     vecY<<1.3<<2<<3.1<<3.5<<6;
     m_QcustomPlot->graph(0)->setData(vecX, vecY);//在第一个权限中添加数据点

     //动态加点
     m_QcustomPlot->graph(0)->addData(19.7,  2.11);

     //设置标题, 必须先调用insertRow插入一行才能够显示
     m_QcustomPlot->plotLayout()->insertRow(0);

     QCPTextElement *title = new QCPTextElement(m_QcustomPlot, "身高体重标准对照表",   QFont("sans", 17, QFont::Bold));

     m_QcustomPlot->plotLayout()->addElement(0, 0, title);

     //设置颜色、线宽
     QPen graphPen;
     graphPen.setColor(QColor(rand()%245+10, rand()%245+10, rand()%245+10));//QColor::yellow()
     graphPen.setWidthF(rand()/(double)RAND_MAX*2+1);
     m_QcustomPlot->graph(0)->setPen(graphPen);

    //显示线介绍，默认右上角
     m_QcustomPlot->legend->setVisible(true);
     QFont legendFont = font();
     legendFont.setPointSize(10);
     m_QcustomPlot->legend->setFont(legendFont);
     m_QcustomPlot->legend->setSelectedFont(legendFont);
     m_QcustomPlot->legend->setSelectableParts(QCPLegend::spItems); // legend box shall not be selectable, only legend items

     //设置坐标名
     m_QcustomPlot->xAxis->setLabel("x 身高");
     m_QcustomPlot->yAxis->setLabel("y 体重");

     //重新调节轴、调用后坐标会根据实际情况增加
     m_QcustomPlot->rescaleAxes();

     //重新生成图表
     m_QcustomPlot->replot();
}


******************


MainWindow::~MainWindow()
{
}