47.QT-QChart之曲线图,饼状图,条形图使用

 1.使用准备

在pro中, 添加QT+= charts

然后在界面头文件中添加头文件并声明命名空间,添加:

#include <QtCharts>
QT_CHARTS_USE_NAMESPACE

2.QChart之曲线图

绘制曲线图需要用到3个类

• QSplineSeries:  用于创建有由一系列数据组成的曲线.类似的还有QPieSeries(饼图数据). QLineSeries(折线数据)
• QChart:    图表界面,用来管理图表内容,颜色,大小等
• QChartView:  负责显示QChart

效果如下:

代码如下所示:

    m_chart = new QChart();
    QSplineSeries *series1 = new QSplineSeries();//实例化一个QLineSeries对象
    series1->setColor(QColor(,,));
    series1->append(QPointF(,qrand()%)) ;
    series1->append(QPointF(,qrand()%)) ;
    series1->append(QPointF(,qrand()%)) ;
    series1->append(QPointF(,qrand()%)) ;
    series1->append(QPointF(,qrand()%)) ;
    series1->setName("线条1");

    series1->setVisible(true);
    series1->setPointLabelsFormat("(@xPoint,@yPoint)");
    series1->setPointLabelsVisible(true);

    m_chart->setTheme(QChart::ChartThemeLight);//设置白色主题
    m_chart->setDropShadowEnabled(true);//背景阴影
    m_chart->setAutoFillBackground(true);  //设置背景自动填充
    m_chart->addSeries(series1);//添加系列到QChart上

    m_chart->setTitleBrush(QBrush(QColor(,,)));//设置标题Brush
    m_chart->setTitleFont(QFont("微软雅黑"));//设置标题字体
    m_chart->setTitle("曲线图");

    //创建X轴和Y轴
    QValueAxis *axisX = new QValueAxis;
    axisX->setRange(,);    //默认则坐标为动态计算大小的
    axisX->setLabelFormat("%dS");
    QValueAxis *axisY = new QValueAxis;
    axisY->setRange(,);    //默认则坐标为动态计算大小的
    axisY->setTitleText("value值");

    m_chart->setAxisX(axisX,series1);
    m_chart->setAxisY(axisY,series1);
    //m_chart->createDefaultAxes();             //或者创建默认轴

    //修改说明样式
    m_chart->legend()->setVisible(true);
    m_chart->legend()->setAlignment(Qt::AlignBottom);//底部对齐
    m_chart->legend()->setBackgroundVisible(true);//设置背景是否可视
    m_chart->legend()->setAutoFillBackground(true);//设置背景自动填充
    m_chart->legend()->setColor(QColor(,,));//设置颜色
    m_chart->legend()->setLabelColor(QColor(,,));//设置标签颜色
    m_chart->legend()->setMaximumHeight();
    QChartView *chartView = new QChartView(m_chart);
    chartView->setRenderHint(QPainter::Antialiasing);

    QVBoxLayout *pVLayout = new QVBoxLayout(this);
    pVLayout->addWidget(chartView);

    resize(, );

3.QChart之饼图

绘制饼图需要用到3个类

• QSplineSeries:   用于创建有由一系列数据组成的饼图数据
• QChart:    图表界面,用来管理图表内容,颜色,大小等
• QChartView:负责显示QChart

效果如下:

代码如下:

    m_chart = new QChart();

    QPieSeries *series = new QPieSeries();
    series->append("水果:30%",);     //添加标签"水果:30%" 和 百分值30%
    series->append("零食:20%",);
    series->append("主食:50%",);

    series->setLabelsVisible(true);
    series->setUseOpenGL(true);
    series->slices().at()->setColor(QColor(,,));   //设置颜色
    series->slices().at()->setLabelColor(QColor(,,));

    series->slices().at()->setColor(QColor(,,));
    series->slices().at()->setLabelColor(QColor(,,));
    series->slices().at()->setColor(QColor(,,));
    series->slices().at()->setLabelColor(QColor(,,));

    m_chart->setTheme(QChart::ChartThemeLight);//设置白色主题
    m_chart->setDropShadowEnabled(true);//背景阴影
    m_chart->addSeries(series);//添加系列到QChart上

    m_chart->setTitleBrush(QBrush(QColor(,,)));//设置标题Brush
    m_chart->setTitleFont(QFont("微软雅黑"));//设置标题字体
    m_chart->setTitle("饼状图");

    //修改说明样式
    m_chart->legend()->setVisible(true);
    m_chart->legend()->setAlignment(Qt::AlignBottom);//底部对齐
    m_chart->legend()->setBackgroundVisible(true);//设置背景是否可视
    m_chart->legend()->setAutoFillBackground(true);//设置背景自动填充
    m_chart->legend()->setColor(QColor(,,));//设置颜色
    m_chart->legend()->setLabelColor(QColor(,,));//设置标签颜色
    m_chart->legend()->setMaximumHeight();

    QChartView *chartView = new QChartView(m_chart);
    chartView->setRenderHint(QPainter::Antialiasing);

    QVBoxLayout *pVLayout = new QVBoxLayout(this);
    pVLayout->addWidget(chartView);

    resize(, );

4. QChart之条形图

绘制条形图需要用到4个类

• QBarSet: 一个条形集合
• QBarSeries:  用来封装多个QBarSet的条形数据
• QChart:   图表界面,用来管理图表内容,颜色,大小等
• QChartView:  负责显示QChart

效果如下:

代码如下:

    m_chart = new QChart();

    //创建3个条线数据
    QBarSet *set0 = new QBarSet("零食");
    QBarSet *set1 = new QBarSet("水果");
    QBarSet *set2 = new QBarSet("主食");

    *set0 <<  <<  <<  <<  << ;    //向零食数据添加这4个月的销售数据
    *set1 <<  <<  <<  <<  << ;
    *set2 <<  <<  <<  <<  << ;

    set0->setLabelColor(QColor(,,));       //设置条形数据颜色
    set1->setLabelColor(QColor(,,));
    set2->setLabelColor(QColor(,,));

    QBarSeries *series = new QBarSeries();
    series->append(set0);
    series->append(set1);
    series->append(set2);
    series->setVisible(true);
    series->setLabelsVisible(true);

    m_chart->setTheme(QChart::ChartThemeLight);//设置白色主题
    m_chart->setDropShadowEnabled(true);//背景阴影
    m_chart->addSeries(series);//添加系列到QChart上

    m_chart->setTitleBrush(QBrush(QColor(,,)));//设置标题Brush
    m_chart->setTitleFont(QFont("微软雅黑"));//设置标题字体
    m_chart->setTitle("超市销售条形图");

    //创建X轴和Y轴
    QBarCategoryAxis *axisX = new QBarCategoryAxis;
    axisX->append("一月");
    axisX->append("二月");
    axisX->append("三月");
    axisX->append("四月");
    axisX->append("五月");
    axisX->setLabelsColor(QColor(,,));

    QValueAxis *axisY = new QValueAxis;
    axisY->setRange(,);   //改为setRange(0,1);则表示坐标为动态计算大小的
    axisY->setTitleText("价格");
    axisY->setLabelFormat("%d$");

    m_chart->setAxisX(axisX,series);
    m_chart->setAxisY(axisY,series);

    //修改说明样式
    m_chart->legend()->setVisible(true);
    m_chart->legend()->setAlignment(Qt::AlignBottom);//底部对齐
    m_chart->legend()->setBackgroundVisible(true);//设置背景是否可视
    m_chart->legend()->setAutoFillBackground(true);//设置背景自动填充
    m_chart->legend()->setColor(QColor(,,));//设置颜色
    m_chart->legend()->setLabelColor(QColor(,,));//设置标签颜色
    m_chart->legend()->setMaximumHeight();

    QChartView *chartView = new QChartView(m_chart);
    chartView->setRenderHint(QPainter::Antialiasing);

    QVBoxLayout *pVLayout = new QVBoxLayout(this);
    pVLayout->addWidget(chartView);

    resize(, );

未完待续,下章学习:  52.Qt-Charts动态显示多条折线电压值(实现示波器效果)