C++ QT 6.6.1 QCustomPlot的导入及使用注意事项和示例 | 关于高版本QT使用QCustomPlot报错问题解决的办法

记录一下

qmake .pro文件的配置

QT       += core gui printsupportgreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++17# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp \qcustomplot.cpp \widget.cppHEADERS += \qcustomplot.h \widget.hFORMS += \widget.ui# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += targetQMAKE_CXXFLAGS += -Wa,-mbig-obj

关键在于这两条（debug模式编译通过不报错）

一个是添加printsupport，另一个是解决太大不能编译的问题

QT       += core gui printsupport
QMAKE_CXXFLAGS += -Wa,-mbig-obj

编译通过

使用示例（代码由DeepSeek生成，微调了下）

widget.h文件

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QTimer>
#include <QElapsedTimer>
#include <QRandomGenerator>
#include "qcustomplot.h"QT_BEGIN_NAMESPACE
namespace Ui {
class Widget;
}
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();
private slots:void realtimeDataSlot();
private:QCustomPlot *customPlot;QTimer dataTimer;double xOffset = 0;QElapsedTimer timer;
private:Ui::Widget *ui;
};
#endif // WIDGET_H

widget.cpp文件

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);// 初始化图表customPlot = new QCustomPlot(this);customPlot->setGeometry(0,0,width(),height());// 设置图表标题customPlot->plotLayout()->insertRow(0);customPlot->plotLayout()->addElement(0, 0, new QCPTextElement(customPlot, "实时数据演示", QFont("微软雅黑", 12, QFont::Bold)));// 添加数据曲线customPlot->addGraph();customPlot->graph(0)->setPen(QPen(QColor(40, 110, 255))); // 蓝色线条customPlot->graph(0)->setName("正弦波形");customPlot->graph(0)->setBrush(QColor(40, 110, 255, 20)); // 半透明填充// 配置坐标轴customPlot->xAxis->setLabel("时间 (s)");customPlot->yAxis->setLabel("数值");customPlot->xAxis->setRange(0, 10);customPlot->yAxis->setRange(-1.5, 1.5);// 显示图例customPlot->legend->setVisible(true);customPlot->legend->setFont(QFont("微软雅黑", 9));// 设置定时器用于实时更新数据connect(&dataTimer, &QTimer::timeout, this, &Widget::realtimeDataSlot);dataTimer.start(50); // 每50ms更新一次timer.start();
}Widget::~Widget()
{delete ui;
}
void Widget::realtimeDataSlot()
{// 计算新数据点double key = timer.elapsed()/1000.0; // 时间戳（秒）static double lastPointKey = 0;if (key - lastPointKey > 0.002) // 添加数据间隔2ms{// 添加正弦波数据double value = sin(key + xOffset);// 添加数据到曲线customPlot->graph(0)->addData(key, value);// 使x轴向右滚动customPlot->xAxis->setRange(key, 10, Qt::AlignRight);// 重绘图表customPlot->replot();lastPointKey = key;}// 随机改变相位用于演示效果xOffset += (QRandomGenerator::global()->generateDouble() - 0.5) * 0.02;
}