Qt_QChart的使用记录（小白）

主要是记录柱状图的数值显示，散点图的点坐标显示（防止后续忘记，把文件都贴出来，方便复查）

资源库： WarehouseInputOrOutput.pro

 QT       += core gui
 QT += charts

 greaterThan(QT_MAJOR_VERSION, ): QT += widgets

 TARGET = WarehouseInputOrOutput
 TEMPLATE = app

 DEFINES += QT_DEPRECATED_WARNINGS

 SOURCES += main.cpp\
         warehouseinputoroutput.cpp \
         callout.cpp

 HEADERS  += warehouseinputoroutput.h \
             callout.h

 FORMS    += warehouseinputoroutput.ui

头文件：WarehouseInputOrOutput.h

 #ifndef WAREHOUSEINPUTOROUTPUT_H
 #define WAREHOUSEINPUTOROUTPUT_H

 #include <QMainWindow>
 #include <QtCharts/QChartView>
 #include <QtCharts>

 namespace Ui {
 class WarehouseInputOrOutput;
 }

 class WarehouseInputOrOutput : public QMainWindow
 {
     Q_OBJECT

 public:
     explicit WarehouseInputOrOutput(QWidget *parent = );
     ~WarehouseInputOrOutput();
     void initData();
     QChart* setBarData();
     QChart* setSeatterData();
     QChart* setChartNature(QChart* chart);

 private:
     Ui::WarehouseInputOrOutput *ui;

 };

 #endif // WAREHOUSEINPUTOROUTPUT_H

定义：WarehouseInputOrOutput.cpp

 #include "warehouseinputoroutput.h"
 #include "ui_warehouseinputoroutput.h"
 #include <QtCharts/QValueAxis>
 #include <QtCharts>
 #include <qlabel.h>
 #include <QtGui/QMouseEvent>
 #include <QtWidgets/QGridLayout>
 #include <QtWidgets/QHBoxLayout>

 WarehouseInputOrOutput::WarehouseInputOrOutput(QWidget *parent) :
     QMainWindow(parent),
     ui(new Ui::WarehouseInputOrOutput)
 {

     ui->setupUi(this);

     initData();
 }

 WarehouseInputOrOutput::~WarehouseInputOrOutput()
 {
     delete ui;
 }

 QChart* WarehouseInputOrOutput::setChartNature(QChart* chart)
 {

     chart->setTheme(QChart::ChartThemeLight); // 设置白色主题
     chart->setDropShadowEnabled(true); // 背景阴影
 //    chart->addSeries(series);    // 数据关联
     chart->setTitleBrush(QBrush(QColor(, , )));     // 设置标题Brush
     chart->setTitleFont(QFont("宋体"));    // 设置标题字体

     chart->legend()->setVisible(true);
     chart->legend()->setAlignment(Qt::AlignBottom);  // 对齐方式：底部对齐
     chart->legend()->setBackgroundVisible(true);     //  设置背景 可见
     chart->legend()->setAutoFillBackground(true);    // 自动填充背景
     chart->legend()->setColor(QColor(, , ));
     chart->legend()->setLabelColor(QColor(, , ));
 //    chart->legend()->setMaximumHeight(50);   // 设置高度
 //    chart->legend()->hide();

     return chart;
 }

 QChart* WarehouseInputOrOutput::setBarData()
 {
     QChart* barChart = new QChart();
     QBarSet* set0 = new QBarSet("入库数");
     QBarSet* set1 = new QBarSet("出库数");
     QBarSet* set2 = new QBarSet("存量数");
     int maxXCount = ;
     int maxYCount = ;

     // testData
     QMap<int, int> barData;
     for(int i = ; i < ; ++i)
     {
         barData[i] = i *  + ;
     }
     for(int i = ; i < ;++i)
     {
         set0->append(barData[i]);
         set1->append(barData[ - i]);
     }
     for(int i = ; i < maxXCount; ++ i)
     {
         set2->append(i * );
     }
     set0->setLabelColor(Qt::black);
     set1->setLabelColor(Qt::red);
     set2->setLabelColor(Qt::cyan);

     QBarSeries* series = new QBarSeries();
     series->append(set0);
     series->append(set1);
     series->append(set2);
     series->setVisible(true);
     series->setLabelsVisible(true);
     // 柱状图数字显示在最上方
     series->setLabelsPosition(QAbstractBarSeries::LabelsInsideBase);

     setChartNature(barChart);
     barChart->addSeries(series);
     barChart->setTitle("出入库统计");

     QCategoryAxis*  axisX = new QCategoryAxis();
     axisX->setStartValue(-0.5);
     for(int i = ; i < maxXCount + ; ++ i)
         axisX->append("物料" + QString::number(i), i - 0.5);

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

     barChart->setAxisX(axisX, series);
     barChart->setAxisY(axisY, series);
     series->attachAxis(axisX);
     series->attachAxis(axisY);

     return barChart;
 }

 QChart* WarehouseInputOrOutput::setSeatterData()
 {
     QChart* seatterChart = new QChart();
     int maxXCount = ;
     int maxYCount = ;
     setChartNature(seatterChart);
     seatterChart->setTitle("存量数");

     QCategoryAxis* axisX = new QCategoryAxis();
 //    axisX->setMin(0);
     axisX->setMax(maxXCount);
     axisX->setStartValue();
     for(int i = ; i < maxXCount + ; ++ i)
         axisX->append("timer" + QString::number(i), i);

     QValueAxis* axisY = new QValueAxis();
     axisY->setRange(, maxYCount);
     axisY->setTitleText("存量");
     axisY->setLabelFormat("%d");
     QScatterSeries* seatter = new QScatterSeries();
     for(int i = ;i < maxXCount + ; ++i)
         seatter->append(i - 0.5, i * );
     seatter->setPen(QPen(Qt::NoPen));
     seatter->setColor(QColor(, , ));
     // 设置散点大小
     seatter->setMarkerSize();
     // 设置散点样式
 //    seatter->setMarkerShape(QScatterSeries::MarkerShapeRectangle);
     seatter->setName("存量");
     // 显示设定点的坐标值
     seatter->setPointLabelsFormat("(@xPoint, @yPoint)");
     seatter->setPointLabelsVisible(true);

     seatterChart->addSeries(seatter);

 seatter->attachAxis(axisX);  seatter->attachAxis(axisY); seatterChart->setAxisX(axisX, seatter);  seatterChart->setAxisY(axisY, seatter);   return seatterChart;  }   void WarehouseInputOrOutput::initData()  {  QChart* barChart = new QChart();  barChart = setBarData();  QChartView* showChart = new QChartView(barChart);   QChart* seatterChart = new QChart();  seatterChart = setSeatterData();  QChartView* showSeatter = new QChartView(seatterChart);   QGridLayout* gridLayout = new QGridLayout();  gridLayout->addWidget(showSeatter, , );  gridLayout->addWidget(showChart, , );  resize(, );  ui->centralWidget->setLayout(gridLayout);   return;  }

mian.cpp

 #include "warehouseinputoroutput.h"
 #include <QApplication>

 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
     WarehouseInputOrOutput w;
     w.show();

     return a.exec();
 }

补充个更新的函数，以便后续自查

 // 更新坐标轴和数据
 void WarehouseInputOrOutput::updateShow()
 {
     qDebug() << "enter the updateShow";
     // 需计算的前置参数
     int maxXCount = ;      // x轴分割为几块
     int maxYCount = ;   // 出入库的浮动上限（传参时加10%方便显示）
     int maxSeaterY = ; // 实际存量的上限（传参时加20%方便显示坐标）

     QBarSet* set0 = new QBarSet("入库数");
     QBarSet* set1 = new QBarSet("出库数");
     set0->setLabelColor(Qt::black);
     set1->setLabelColor(Qt::red);

     int i = ;
     QMap<QString, int>::const_iterator inIt;
     QMap<QString, int>::const_iterator outIt;
     for(inIt = m_InputSum.begin(), outIt = m_OutputSum.begin();i < maxXCount && inIt != m_InputSum.end() && outIt != m_OutputSum.end();++inIt, ++ outIt)
     {
         set0->append(inIt.value());
         set1->append(outIt.value());
         ++i;
     }

     // 出库数、入库数、存量数、日期
     for(int i = ; i < maxXCount; ++i)
     {
         m_OutputSum["物料" + QString::number(i)] = i * ;
         m_InputSum["物料" + QString::number(i)] = i * ;
         m_StockSum["物料" + QString::number(i)] = i * ;
     }
     m_date = QDateTime::currentDateTime().toString("yyyy/MM/dd");

     m_barChart->removeAllSeries();
     QBarSeries* newSeries = new QBarSeries();
     newSeries->append(set0);
     newSeries->append(set1);
     newSeries->setVisible(true);
     newSeries->setLabelsVisible(true);
     // 柱状图数字显示在最上方
     newSeries->setLabelsPosition(QAbstractBarSeries::LabelsInsideBase);
     m_barChart->addSeries(newSeries);

     // 移除原有数据，后续更新数据（update动作必须先移除原数据）
     m_barChart->removeAxis(m_barChart->axisX());
     m_barChart->removeAxis(m_barChart->axisY());

     QCategoryAxis*  axisX = new QCategoryAxis();
     axisX->setStartValue(-0.5);
     i = ;  // 辅助位置
     for(inIt = m_InputSum.begin(); inIt != m_InputSum.end() && i < maxXCount;++inIt)
         axisX->append(inIt.key(), i++ - 0.5);

     QValueAxis *axisY = new QValueAxis;
     axisY->setRange(, maxYCount * 1.1);
     axisY->setTitleText("数量");
     axisY->setLabelFormat("%d");
     m_barChart->setAxisX(axisX, newSeries);
     m_barChart->setAxisY(axisY, newSeries);
     // 数据匹配坐标轴
     newSeries->attachAxis(axisX);
     newSeries->attachAxis(axisY);

     // 更新散点图数据
     QScatterSeries* newSeatter = new QScatterSeries();
     for(int i = ;i < maxXCount + ; ++i)
         newSeatter->append(i - 0.5, i * );
     // 设置散点大小
     newSeatter->setMarkerSize();
     newSeatter->setName("存量");
     // 显示设定点的值
     newSeatter->setPointLabelsFormat("@yPoint");
     newSeatter->setPointLabelsVisible(true);
     m_seatterChart->removeAllSeries();
     m_seatterChart->addSeries(newSeatter);

     QCategoryAxis* seatterAxisX = new QCategoryAxis();\
     seatterAxisX->setMax(1.1*maxXCount);
     seatterAxisX->setStartValue();
     QMap<QString, int>::const_iterator stockIt;
     int i = ;
     for(stockIt = m_StockSum.begin();stockIt != m_StockSum.end();++stockIt)
         seatterAxisX->append(stockIt.key(), i++);

     QValueAxis* seatterAxisY = new QValueAxis();
     seatterAxisY->setRange(, 1.2*maxYCount);
     seatterAxisY->setTitleText("存量");
     seatterAxisY->setLabelFormat("%d");
     // 移除原有数据，添加新数据（update动作必须先移除原数据）
     m_seatterChart->removeAxis(m_seatterChart->axisX());
     m_seatterChart->removeAxis(m_seatterChart->axisY());
     m_seatterChart->addAxis(seatterAxisX, newSeatter);
     m_seatterChart->addAxis(seatterAxisY, newSeatter);

     // 数据匹配坐标轴
     newSeatter->attachAxis(m_seatterChart->axisX());
     newSeatter->attachAxis(m_seatterChart->axisY());

     update();
 }

     seatterChart->addSeries(seatter);