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QChart曲线绘制-1.普通曲线

news 来源：原创 2024/9/21 1:52:05

pro文件，添加一行
QT += charts

#-------------------------------------------------
#
# Project created by QtCreator 2024-08-05T07:43:10
#
#-------------------------------------------------QT       += core gui
QT       += chartsgreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsTARGET = simplechart2
TEMPLATE = app# The following define makes your compiler emit warnings if you use
# any feature of Qt which has 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 6.0.0SOURCES += \main.cpp \mainwindow.cpp \mychart.cppHEADERS += \mainwindow.h \mychart.hFORMS += \mainwindow.ui

h文件

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QChartView>
#include <QLineSeries>
#include <QValueAxis>
#include <QtMath>QT_CHARTS_USE_NAMESPACEnamespace Ui {
class MainWindow;
}class MainWindow : public QMainWindow
{Q_OBJECTpublic:explicit MainWindow(QWidget *parent = 0);~MainWindow();private:Ui::MainWindow *ui;QLineSeries *seriesS=nullptr;QLineSeries *seriesC=nullptr;QChart* chart=nullptr;QChartView* cview=nullptr;QValueAxis* axisX=nullptr;QValueAxis* axisY=nullptr;
};#endif // MAINWINDOW_H

c++文件

#include "mainwindow.h"
#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow)
{ui->setupUi(this);// 设置主窗口的标题setWindowTitle("simple chart");cview=new QChartView(this);chart=new QChart();chart->setTitle("chart");// 设置图表的标题cview->setChart(chart);//设置QChart为QChartView对象的图表，以便QChartView 能够显示并渲染QChart中的内容setCentralWidget(cview);//设置cview为主窗口的中央部件，占据主要显示位置seriesS=new QLineSeries;// 创建一个 QLineSeries 对象，用于存储和显示数据系列chart->addSeries(seriesS);// 将数据系列添加到图表中seriesS->setName("sin0");// 设置数据系列的名称seriesC=new QLineSeries;//配置第二条曲线chart->addSeries(seriesC);seriesC->setName("cos0");//添加数据点到序列中qreal y0,y1,t=0,intv=0.1;size_t count=100;for(size_t i=0;i<count;i++){y0=qSin(t);y1=qCos(t);seriesS->append(t,y0);seriesC->append(t,y1);t+=intv;}//设置坐标轴axisX=new QValueAxis;axisX->setRange(0,10);// 设置 X 轴的范围chart->setAxisX(axisX,seriesS);// 将 X 轴添加到图表中，并关联到 seriesSchart->setAxisX(axisX,seriesC);axisY=new QValueAxis;axisY->setRange(-1,1);// 设置 Y 轴的范围chart->setAxisY(axisY,seriesS);// 将 Y 轴添加到图表中，并关联到 seriesSchart->setAxisY(axisY,seriesC);
}MainWindow::~MainWindow()
{delete ui;
}