Qt第二十二天

朱雀 2022-04-03 09:15 212阅读 0赞

续接之前  
百分百柱状图，散点图，光滑曲线图

void MainWindow::iniPercentBar()//初始化PercentBar
    {
        QChart *chart=ui->chartViewPercentBar->chart();
        chart->setTitle("Percentbar");
        chart->setAnimationOptions(QChart::AllAnimations);
        ui->chartViewPercentBar->setChart(chart);
        ui->chartViewPercentBar->setRenderHint(QPainter::Antialiasing);
    }
    void MainWindow::buildPercentBar()//创建PercentBar
    {
        QChart *chart=ui->chartViewPercentBar->chart();
        chart->removeAllSeries();
        chart->removeAxis(chart->axisX());
        chart->removeAxis(chart->axisY());
        //
        QBarSet *setMath=new QBarSet(theModel->horizontalHeaderItem(colNoMath)->text());
        QBarSet *setChinese=new QBarSet(theModel->horizontalHeaderItem(colNoChinese)->text());
        QBarSet *setEnglish=new QBarSet(theModel->horizontalHeaderItem(colNoEnglish)->text());
        //
        QTreeWidgetItem *item;
        QStringList categories;
        for(int i=0;i<4;i++)
        {
            item=ui->treeWidget->topLevelItem(i);
            categories<<item->text(0);//
            setMath->append(item->text(colNoMath).toInt());
            setChinese->append(item->text(colNoChinese).toInt());
            setEnglish->append(item->text(colNoEnglish).toInt());
        }
        //从分数段统计数据获得数据，添加到数据集
        QPercentBarSeries *series=new QPercentBarSeries();
        series->append(setMath);
        series->append(setChinese);
        series->append(setEnglish);
        series->setLabelsVisible(true);
        chart->addSeries(series);
        //坐标轴
        QBarCategoryAxis *axisX=new QBarCategoryAxis();
        axisX->append(categories);
        chart->setAxisX(axisX,series);
        axisX->setRange(categories.at(0),categories.at(categories.count()-1));
        QValueAxis *axisY=new QValueAxis();
        axisY->setRange(0,100);
        axisY->setTitleText("percent");
        axisY->setTickCount(6);
        axisY->setLabelFormat("%.0f");//标签格式
        chart->setAxisY(axisY,series);
        //图例
        chart->legend()->setVisible(true);
        chart->legend()->setAlignment(Qt::AlignBottom);
    }
    
    
    void MainWindow::on_btnPercentBar_clicked()//PercentBar按钮
    {
        buildPercentBar();
    }
    
    
    void MainWindow::iniScatterChart()//初始化
    {
        QChart *chart=ui->chartViewScatter->chart();
        chart->setTitle("Scatter和SpLine");
        chart->setAnimationOptions(QChart::AllAnimations);
        ui->chartViewScatter->setChart(chart);
        ui->chartViewScatter->setRenderHint(QPainter::Antialiasing);
    }
    
    
    void MainWindow::buildScatterChart()//创建图表
    {
        QChart *chart=ui->chartViewScatter->chart();
        chart->removeAxis(chart->axisX());
        chart->removeAxis(chart->axisY());
        chart->removeAllSeries();
        //光滑曲线序列
        QSplineSeries *series=new QSplineSeries();
        series->setName("spline");
        QPen pen;
        pen.setWidth(2);
        pen.setColor(Qt::yellow);
        series->setPen(pen);
        //散点序列
        QScatterSeries *series0=new QScatterSeries();
        series0->setName("散点");
        series0->setMarkerShape(QScatterSeries::MarkerShapeRectangle);//矩形
        series0->setBorderColor(Qt::black);
        series0->setBrush(QBrush(Qt::blue));
        series0->setMarkerSize(12);//设置数据点的大小
        //设置数值
        qsrand(QTime::currentTime().second());//随机数种子
        for(int i=0;i<10;i++)
        {
            int x=qrand()%20;
            int y=qrand()%20;
            series0->append(x,y);
            series->append(x,y);
        }
        chart->addSeries(series);
        chart->addSeries(series0);
        //坐标轴
        chart->createDefaultAxes();//缺省的坐标轴
        chart->axisX()->setTitleText("X");
        chart->axisY()->setTitleText("Y");
        chart->axisX()->setRange(-2,22);
        chart->axisY()->setRange(-2,22);
        //图例
        chart->legend()->setVisible(true);
        chart->legend()->setAlignment(Qt::AlignRight);
    }
    
    
    void MainWindow::on_btnScatter_clicked()//刷新图表按钮
    {
        buildScatterChart();
    }

运行结果  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RoZVJvb2tpZTE_size_16_color_FFFFFF_t_70]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RoZVJvb2tpZTE_size_16_color_FFFFFF_t_70 1]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RoZVJvb2tpZTE_size_16_color_FFFFFF_t_70]: /images/20220403/896de37b9c8e42179c1639de0f7c0989.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RoZVJvb2tpZTE_size_16_color_FFFFFF_t_70 1]: /images/20220403/f8867600c511482eafa144c07a6e36ca.png