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Qt（十三）QChart绘制折线图

文章目录

一、简单绘图

Qt Charts基于Qt的Graphics View架构，其核心组件是QChartView 和 QChart

  • QChartView是显示图标的视图，基类为QGraphicsView
  • QChart的基类是QGraphicsltem

类的继承关系：
在这里插入图片描述
创建项目：

.pro

文件中添加：

QT += charts

代码如下：其他文件未修改，修改代码只在mainwindow.cpp文件中进行。
mainwindow.cpp

#include"mainwindow.h"#include"ui_mainwindow.h"#include<QChartView>#include<QLineSeries>#include<QValueAxis>#include<QtMath>
QT_CHARTS_USE_NAMESPACE

MainWindow::MainWindow(QWidget *parent):QMainWindow(parent),ui(new Ui::MainWindow){
    ui->setupUi(this);setWindowTitle("QChart简单绘图");//创建图表框架
    QChartView* cview =newQChartView(this);
    QChart* chart =newQChart();
    chart->setTitle("简单函数曲线");

    cview->setChart(chart);setCentralWidget(cview);//创建折现序列
    QLineSeries* seriesS =new QLineSeries;
    QLineSeries* seriesC =new QLineSeries;
    seriesS->setName("Sinθ");
    seriesC->setName("Cosθ");
    chart->addSeries(seriesS);
    chart->addSeries(seriesC);//添加数据绘制
    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;}//创建坐标轴
    QValueAxis* axisX =new QValueAxis;
    axisX->setRange(0,10);
    chart->setAxisX(axisX,seriesS);
    chart->setAxisX(axisX,seriesC);

    QValueAxis* axisY =new QValueAxis;
    axisY->setRange(-1,1);
    chart->setAxisY(axisY,seriesS);
    chart->setAxisY(axisY,seriesC);}MainWindow::~MainWindow(){delete ui;}

在这里插入图片描述

二、绘制折线图

数据序列类继承关系
在这里插入图片描述
坐标类继承关系
在这里插入图片描述

实例

初步UI设计
1
2
3

自定义DialogPen类

新建

DialogPen

类继承

QDialog

：

#ifndefDIALOGPEN_H#defineDIALOGPEN_H#include<QDialog>#include<QColorDialog>#include<QPen>#include<QPalette>namespace Ui {classDialogPen;}classDialogPen:publicQDialog{
    Q_OBJECT

public:explicitDialogPen(QWidget *parent =nullptr);~DialogPen();

    QPen getpen();static QPen getPen(QPen initPen,bool&ok);voidsetPen(const QPen &pen);private slots:voidon_pushButton_clicked();private:
    QPen m_pen;
    Ui::DialogPen *ui;};#endif// DIALOGPEN_H

#include"dialogpen.h"#include"ui_dialogpen.h"#include<QString>DialogPen::DialogPen(QWidget *parent):QDialog(parent),ui(new Ui::DialogPen){
    ui->setupUi(this);
    ui->comboBox->clear();
    ui->comboBox->addItem("NoPen",0);
    ui->comboBox->addItem("SolidLine",1);
    ui->comboBox->addItem("DashLine",2);
    ui->comboBox->addItem("DotLine",3);
    ui->comboBox->addItem("DashDotLine",4);
    ui->comboBox->addItem("DashDotDotLine",5);
    ui->comboBox->addItem("CustomDashLine",6);
    ui->comboBox->setCurrentIndex(0);}DialogPen::~DialogPen(){delete ui;}voidDialogPen::on_pushButton_clicked(){
    QColor color = m_pen.color();QColorDialog::getColor(color);if(color.isValid()){
        QString str =QString::asprintf("background-color: rgb(%d,%d,%d)",color.red(),color.green(),color.blue());
        ui->btnColor->setStyleSheet(str);}}

QPen DialogPen::getpen(){
    m_pen.setStyle(Qt::PenStyle(ui->comboBox->currentIndex()));
    m_pen.setWidth(ui->spinBox->value());
    QColor color = ui->btnColor->palette().color(QPalette::Button);
    m_pen.setColor(color);return m_pen;}

QPen DialogPen::getPen(QPen initPen,bool&ok){
    DialogPen* dlg =new DialogPen;
    QPen pen;
    dlg->setPen(initPen);int ret = dlg->exec();if(ret == QDialog::Accepted){
        pen = dlg->getpen();
        ok =true;}else{
        pen = initPen;
        ok =false;}delete dlg;return pen;}voidDialogPen::setPen(const QPen &pen){
    m_pen = pen;
    ui->spinBox->setValue(pen.width());int i =static_cast<int>(pen.style());
    ui->comboBox->setCurrentIndex(i);
    ui->btnColor->setAutoFillBackground(true);
    QColor color = pen.color();
    QString str =QString::asprintf("background-color: rgb(%d,%d,%d)",color.red(),color.green(),color.blue());
    ui->btnColor->setStyleSheet(str);}
mainwindow类

mainwindow.h

#ifndefMAINWINDOW_H#defineMAINWINDOW_H#include<QMainWindow>#include<QChartView>#include<QtCharts>#include<QColor>#include<QLineSeries>#include<QValueAxis>#include<QtMath>#include<QTime>#include<QChart>#include<QFontDialog>#include"dialogpen.h"

QT_CHARTS_USE_NAMESPACE

QT_BEGIN_NAMESPACE
namespace Ui {classMainWindow;}
QT_END_NAMESPACE

classMainWindow:publicQMainWindow{
    Q_OBJECT

public:MainWindow(QWidget *parent =nullptr);~MainWindow();private slots:voidon_actZoomOut_triggered();voidon_actZoomIn_triggered();voidon_actReset_triggered();voidon_actFlush_triggered();voidon_btn_set_clicked();voidon_btn_titleFont_clicked();voidon_rBtn_Up_clicked();voidon_rBtn_Down_clicked();voidon_rBtn_Left_clicked();voidon_rBtn_Right_clicked();voidon_checkBox_legend_clicked(bool checked);voidon_checkBox_legendBG_clicked(bool checked);voidon_pBtn_Font_clicked();voidon_pBtn_legendcolor_clicked();voidon_pBtn_setMargin_clicked();voidon_comboBox_motion_currentIndexChanged(int index);voidon_comboBox_theme_currentIndexChanged(int index);voidon_sin_curve_clicked();voidon_cos_curve_clicked();voidon_pBtn_name_clicked();voidon_checkBox_curve_clicked(bool checked);voidon_checkBox_data_clicked(bool checked);voidon_pBtn_color_clicked();voidon_pBtn_pen_clicked();voidon_horizontalSlider_valueChanged(int value);voidon_checkBox_pointLableVisible_clicked(bool checked);voidon_pushButton_13_clicked();voidon_pushButton_12_clicked();voidon_rBtn_Y_clicked();voidon_rBtn_XY_clicked();voidon_rBtn_XAxies_clicked();voidon_rBtn_YAxies_clicked();voidon_Axis_isVisible_clicked(bool checked);voidon_Axis_range_clicked();voidon_Axis_setTitle_clicked();voidon_Axis_titleIsVisible_clicked(bool checked);voidon_pBtn_style_clicked();voidon_pBtn_Fontcolor_clicked();voidon_pBtn_setFont_clicked();voidon_chk_scaleIsVisible_clicked(bool checked);voidon_chk_gridLineVisible_clicked(bool checked);voidon_pBtn_Fontcolor_2_clicked();voidon_pBtn_Fontcolor_3_clicked();voidon_spinBox_Tickcount_valueChanged(int arg1);voidon_spinBox_minorTickcount_valueChanged(int arg1);voidon_chk_TickLineIsVisible_clicked(bool checked);voidon_pBtn_Fontcolor_5_clicked();voidon_pBtn_Fontcolor_4_clicked();voidon_pBtn_Fontcolor_7_clicked();voidon_pBtn_Fontcolor_6_clicked();voidon_chk_MinorTickLineIsVisible_clicked(bool checked);private:
    Ui::MainWindow *ui;voidcreateChart();
    QLineSeries* curSeries;
    QValueAxis* curAxis;voidprepareData();voidupdateFromChart();};#endif// MAINWINDOW_H

mainwindow.cpp

#include"mainwindow.h"#include"ui_mainwindow.h"#include"ui_dialogPen.h"MainWindow::MainWindow(QWidget *parent):QMainWindow(parent),ui(new Ui::MainWindow){
    ui->setupUi(this);createChart();prepareData();updateFromChart();}MainWindow::~MainWindow(){delete ui;}voidMainWindow::on_actZoomOut_triggered(){
    ui->cView->chart()->zoom(0.8);}voidMainWindow::on_actZoomIn_triggered(){
    ui->cView->chart()->zoom(1.2);}voidMainWindow::on_actReset_triggered(){
    ui->cView->chart()->zoomReset();}voidMainWindow::createChart(){
    QChart* chart =newQChart();
    chart->setTitle("simple curve");
    ui->cView->setChart(chart);
    ui->cView->setRenderHint(QPainter::Antialiasing);
    QLineSeries* series0 =new QLineSeries;
    QLineSeries* series1 =new QLineSeries;
    series0->setName("sin");
    series1->setName("cos");
    curSeries = series0;

    QPen pen;
    pen.setStyle(Qt::DotLine);
    pen.setWidth(2);
    series0->setPen(pen);
    pen.setStyle(Qt::SolidLine);
    pen.setColor(Qt::blue);
    series1->setPen(pen);

    chart->addSeries(series0);
    chart->addSeries(series1);

    QValueAxis* axisX =new QValueAxis;
    QValueAxis* axisY =new QValueAxis;
    curAxis = axisX;
    axisX->setRange(0,10);
    axisX->setLabelFormat("%.1f");
    axisX->setTickCount(11);
    axisX->setMinorTickCount(4);
    axisX->setTitleText("time(secs)");

    axisY->setRange(-1.5,1.5);
    axisY->setTickCount(3);
    axisY->setMinorTickCount(4);
    axisY->setTitleText("value");

    chart->setAxisX(axisX,series0);
    chart->setAxisX(axisX,series1);
    chart->setAxisY(axisY,series0);
    chart->setAxisY(axisY,series1);}voidMainWindow::prepareData(){
    QLineSeries* series0 =(QLineSeries*)ui->cView->chart()->series().at(0);
    QLineSeries* series1 =(QLineSeries*)ui->cView->chart()->series().at(1);int cnt =100;
    series0->clear();
    series1->clear();qsrand(QTime::currentTime().second());
    qreal t=0, y1, y2, inv=0.1;
    qreal rd;for(int i=0; i<cnt; i++){
        rd =(qrand()%10)-5;
        y1 =qSin(t)+ rd/50;
        series0->append(t,y1);

        y2 =qCos(t)+ rd/50;
        series1->append(t,y2);
        t += inv;}}voidMainWindow::updateFromChart(){
    QChart* chart = ui->cView->chart();
    ui->lineEdit_title->setText(chart->title());
    QMargins mg = chart->margins();
    ui->spinBox_Down->setValue(mg.bottom());
    ui->spinBox_Left->setValue(mg.left());
    ui->spinBox_Right->setValue(mg.right());
    ui->spinBox_Up->setValue(mg.top());}voidMainWindow::on_actFlush_triggered(){prepareData();}voidMainWindow::on_btn_set_clicked(){
    QChart *chart = ui->cView->chart();
    chart->setTitle(ui->lineEdit_title->text());}voidMainWindow::on_btn_titleFont_clicked(){
    QFont font = ui->cView->chart()->titleFont();bool ok =false;
    font =QFontDialog::getFont(&ok,font);if(ok)
        ui->cView->chart()->setTitleFont(font);}voidMainWindow::on_rBtn_Up_clicked(){
    ui->cView->chart()->legend()->setAlignment(Qt::AlignTop);}voidMainWindow::on_rBtn_Down_clicked(){
    ui->cView->chart()->legend()->setAlignment(Qt::AlignBottom);}voidMainWindow::on_rBtn_Left_clicked(){
    ui->cView->chart()->legend()->setAlignment(Qt::AlignLeft);}voidMainWindow::on_rBtn_Right_clicked(){
    ui->cView->chart()->legend()->setAlignment(Qt::AlignRight);}voidMainWindow::on_checkBox_legend_clicked(bool checked){
    ui->cView->chart()->legend()->setVisible(checked);}voidMainWindow::on_checkBox_legendBG_clicked(bool checked){
    ui->cView->chart()->legend()->setBackgroundVisible(checked);}voidMainWindow::on_pBtn_Font_clicked(){
    QFont font = ui->cView->chart()->legend()->font();bool ok =false;
    font =QFontDialog::getFont(&ok,font);if(ok)
        ui->cView->chart()->legend()->setFont(font);}voidMainWindow::on_pBtn_legendcolor_clicked(){
    QColor color = ui->cView->chart()->legend()->labelColor();
    color =QColorDialog::getColor(color);if(color.isValid())
        ui->cView->chart()->legend()->setLabelColor(color);}voidMainWindow::on_pBtn_setMargin_clicked(){
    QMargins mgs;
    mgs.setTop(ui->spinBox_Up->value());
    mgs.setLeft(ui->spinBox_Down->value());
    mgs.setLeft(ui->spinBox_Left->value());
    mgs.setRight(ui->spinBox_Right->value());
    ui->cView->chart()->setMargins(mgs);}voidMainWindow::on_comboBox_motion_currentIndexChanged(int index){
    ui->cView->chart()->setAnimationOptions((QChart::AnimationOption)index);}voidMainWindow::on_comboBox_theme_currentIndexChanged(int index){
    ui->cView->chart()->setTheme((QChart::ChartTheme)index);}voidMainWindow::on_sin_curve_clicked(){if(ui->sin_curve->isChecked())
        curSeries =(QLineSeries*)ui->cView->chart()->series().at(0);else
        curSeries =(QLineSeries*)ui->cView->chart()->series().at(1);//获取curSeries的值, 设置（标题名称，序列可见的，点数据可见，透明度滑动条）
    ui->lineEdit_title->setText(curSeries->name());
    ui->checkBox_curve->setChecked(curSeries->isVisible());
    ui->checkBox_data->setChecked(curSeries->pointsVisible());
    ui->horizontalSlider->setValue(curSeries->opacity()*10);
    ui->checkBox_pointLableVisible->setChecked(curSeries->pointLabelsVisible());}voidMainWindow::on_cos_curve_clicked(){on_sin_curve_clicked();}voidMainWindow::on_pBtn_name_clicked(){
    curSeries->setName(ui->line_name->text());}voidMainWindow::on_checkBox_curve_clicked(bool checked){Q_UNUSED(checked)
    curSeries->setVisible(ui->checkBox_curve->isChecked());}voidMainWindow::on_checkBox_data_clicked(bool checked){Q_UNUSED(checked)
    curSeries->setPointsVisible(ui->checkBox_data->isChecked());}voidMainWindow::on_pBtn_color_clicked(){
    QColor color = curSeries->color();
    color =QColorDialog::getColor(color);if(color.isValid())
        curSeries->setColor(color);}voidMainWindow::on_pBtn_pen_clicked(){bool ok =false;
    QPen pen = curSeries->pen();
    pen =DialogPen::getPen(pen, ok);if(ok)
        curSeries->setPen(pen);}voidMainWindow::on_horizontalSlider_valueChanged(int value){
    curSeries->setOpacity(value/10.0);}voidMainWindow::on_checkBox_pointLableVisible_clicked(bool checked){
    curSeries->setPointLabelsVisible(checked);}voidMainWindow::on_pushButton_13_clicked(){
    QColor color = curSeries->pointLabelsColor();
    color =QColorDialog::getColor(color);if(color.isValid())
        curSeries->setPointLabelsColor(color);}voidMainWindow::on_pushButton_12_clicked(){
    QFont font = curSeries->pointLabelsFont();bool ok =false;
    font =QFontDialog::getFont(&ok, font);if(ok)
        curSeries->setPointLabelsFont(font);}voidMainWindow::on_rBtn_Y_clicked(){if(ui->rBtn_Y->isChecked())
        curSeries->setPointLabelsFormat("@yPoint");else
        curSeries->setPointLabelsFormat("(@xPoint,@yPoint)");}voidMainWindow::on_rBtn_XY_clicked(){on_rBtn_Y_clicked();}voidMainWindow::on_rBtn_XAxies_clicked(){// 设置坐标轴
    QList<QAbstractAxis*> axes;if(ui->rBtn_XAxies->isChecked())
        axes = ui->cView->chart()->axes(Qt::Horizontal);else
        axes = ui->cView->chart()->axes(Qt::Vertical);
    curAxis =(QValueAxis*)axes[0];//获取坐标轴属性，显示到界面上
    ui->dSBox_minV->setValue(curAxis->min());
    ui->dSBox_maxV->setValue(curAxis->max());

    ui->Axis_title->setText(curAxis->titleText());
    ui->Axis_titleIsVisible->setChecked(curAxis->isTitleVisible());

    ui->lineEdit_style->setText(curAxis->labelFormat());
    ui->chk_scaleIsVisible->setChecked(curAxis->labelsVisible());

    ui->chk_gridLineVisible->setChecked(curAxis->isGridLineVisible());

    ui->spinBox_Tickcount->setValue(curAxis->tickCount());
    ui->chk_TickLineIsVisible->setChecked(curAxis->isLineVisible());

    ui->spinBox_minorTickcount->setValue(curAxis->minorTickCount());
    ui->chk_MinorTickLineIsVisible->setChecked(curAxis->isMinorGridLineVisible());}voidMainWindow::on_rBtn_YAxies_clicked(){on_rBtn_XAxies_clicked();}voidMainWindow::on_Axis_isVisible_clicked(bool checked){
    curAxis->setVisible(checked);}voidMainWindow::on_Axis_range_clicked(){
    curAxis->setRange(ui->dSBox_minV->value(), ui->dSBox_maxV->value());}voidMainWindow::on_Axis_setTitle_clicked(){
    curAxis->setTitleText(ui->Axis_title->text());}voidMainWindow::on_Axis_titleIsVisible_clicked(bool checked){
    curAxis->setTitleVisible(checked);}voidMainWindow::on_pBtn_style_clicked(){
    curAxis->setLabelFormat(ui->lineEdit_style->text());}voidMainWindow::on_pBtn_Fontcolor_clicked(){
    QColor color = curAxis->labelsColor();
    color =QColorDialog::getColor(color);if(color.isValid())
        curAxis->setLabelsColor(color);}voidMainWindow::on_pBtn_setFont_clicked(){
    QFont font = curAxis->labelsFont();bool ok =false;
    font =QFontDialog::getFont(&ok, font);if(ok)
        curAxis->setLabelsFont(font);}voidMainWindow::on_chk_scaleIsVisible_clicked(bool checked){
    curAxis->setLineVisible(checked);}voidMainWindow::on_chk_gridLineVisible_clicked(bool checked){
    curAxis->setGridLineVisible(checked);}voidMainWindow::on_pBtn_Fontcolor_2_clicked(){
    QColor color = curAxis->gridLineColor();
    color =QColorDialog::getColor(color);if(color.isValid())
        curAxis->setGridLineColor(color);}voidMainWindow::on_pBtn_Fontcolor_3_clicked(){bool ok =false;
    QPen pen = curAxis->gridLinePen();
    pen =DialogPen::getPen(pen, ok);if(ok)
        curAxis->setGridLinePen(pen);}voidMainWindow::on_spinBox_Tickcount_valueChanged(int arg1){
    curAxis->setTickCount(arg1);}voidMainWindow::on_spinBox_minorTickcount_valueChanged(int arg1){
    curAxis->setMinorTickCount(arg1);}voidMainWindow::on_chk_TickLineIsVisible_clicked(bool checked){
    curAxis->setLineVisible(checked);}voidMainWindow::on_pBtn_Fontcolor_5_clicked(){bool ok =false;
    QPen pen = curAxis->linePen();
    pen =DialogPen::getPen(pen, ok);if(ok)
        curAxis->setLinePen(pen);}voidMainWindow::on_pBtn_Fontcolor_4_clicked(){
    QColor color = curAxis->linePenColor();
    color =QColorDialog::getColor(color);if(color.isValid())
        curAxis->setLinePenColor(color);}voidMainWindow::on_pBtn_Fontcolor_7_clicked(){
    QColor color = curAxis->minorGridLineColor();
    color =QColorDialog::getColor(color);if(color.isValid())
        curAxis->setMinorGridLineColor(color);}voidMainWindow::on_pBtn_Fontcolor_6_clicked(){bool ok =false;
    QPen pen = curAxis->gridLinePen();
    pen =DialogPen::getPen(pen, ok);if(ok)
        curAxis->setGridLinePen(pen);}voidMainWindow::on_chk_MinorTickLineIsVisible_clicked(bool checked){
    curAxis->setMinorGridLineVisible(checked);}
效果演示

在这里插入图片描述

标签： c++ qt ui
本文转载自: https://blog.csdn.net/wsp_1138886114/article/details/123679168
版权归原作者 SongpingWang 所有， 如有侵权，请联系我们删除。
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