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现在qt绘图大家用的比较多的还算是qwt和qcustomplot。qt官方出的qcharts，qt5.4以后才能用，嵌入式系统可能还是不怎么考虑。
以前用过qwt进行绘制，环境搭建的时间稍微麻烦一些。官方提供的库的使用教程不是源码形式使用，debug不太方便。qcustomplot加一个头文件和一个源文件就行，也可以debug方便很多。
1.代码下载
官方网站可以很方便下载：http://www.qcustomplot.com/
http://www.qcustomplot.com/index.php/download
2.把解压出来的源文件qcustomplot.cpp和qcustomplot.h拷贝到源文件目录，并把这两个文件加入.pro文件中。
添加后的.pro文件
#-------------------------------------------------
#
# Project created by QtCreator 2017-06-21T16:36:53
#
#-------------------------------------------------
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport
TARGET = qcp_1
TEMPLATE = app
# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
SOURCES += main.cpp\
mainwindow.cpp\
qcustomplot.cpp
HEADERS += mainwindow.h\
qcustomplot.h
FORMS += mainwindow.ui
4.然后就可以正常使用QCustomPlot进行曲线绘制了。