Qt绘制各种图表

绘制柱状图：

void MainWindow::iniBarChart()
{ //柱状图初始化QChart *chart = new QChart(); //创建chartchart->setTitle("Barchart演示");chart->setAnimationOptions(QChart::SeriesAnimations);ui->chartViewBar->setChart(chart); //为ChartView设置chartui->chartViewBar->setRenderHint(QPainter::Antialiasing);
}void MainWindow::buildBarChart()
{ //构造柱状图QChart *chart =ui->chartViewBar->chart(); //获取ChartView关联的chartchart->removeAllSeries(); //删除所有序列chart->removeAxis(chart->axisX()); //删除坐标轴chart->removeAxis(chart->axisY()); //删除坐标轴//创建三个QBarSet数据集,从数据模型的表头获取NameQBarSet *setMath = new QBarSet(theModel->horizontalHeaderItem(colNoMath)->text());QBarSet *setChinese = new QBarSet(theModel->horizontalHeaderItem(colNoChinese)->text());QBarSet *setEnglish= new QBarSet(theModel->horizontalHeaderItem(colNoEnglish)->text());QLineSeries *Line = new QLineSeries(); //创建一个QLineSeries序列用于显示平均分Line->setName(theModel->horizontalHeaderItem(colNoAverage)->text());QPen    pen;pen.setColor(Qt::red);pen.setWidth(2);Line->setPen(pen);
//    lineseries->setPointLabelsVisible(true);
//    lineseries->setPointLabelsFormat("@yPoint");for(int i=0;i<theModel->rowCount();i++){//从数据模型获取数据setMath->append(theModel->item(i,colNoMath)->text().toInt()); //数学setChinese->append(theModel->item(i,colNoChinese)->text().toInt()); //语文setEnglish->append(theModel->item(i,colNoEnglish)->text().toInt()); //英语Line->append(QPointF(i,theModel->item(i,colNoAverage)->text().toFloat()));  //平均分}//创建一个柱状图序列 QBarSeries, 并添加三个数据集QBarSeries *series = new QBarSeries();series->append(setMath);series->append(setChinese);series->append(setEnglish);
//    series->setLabelsVisible(true);
//    series->setLabelsPosition(QAbstractBarSeries::LabelsOutsideEnd);// LabelsCenter
//    series->setLabelsPosition(QAbstractBarSeries::LabelsCenter);// LabelsCenter//    lineseries->setPointLabelsVisible(true);
//    lineseries->setPointLabelsFormat("@yPoint");chart->addSeries(series); //添加柱状图序列chart->addSeries(Line); //添加折线图序列//用于横坐标在字符串列表,即学生姓名QStringList categories;for (int i=0;i<theModel->rowCount();i++)categories <<theModel->item(i,colNoName)->text();//用于柱状图的坐标轴QBarCategoryAxis *axisX = new QBarCategoryAxis();axisX->append(categories); //添加横坐标文字列表
//    chart->createDefaultAxes();chart->setAxisX(axisX, series); //设置横坐标chart->setAxisX(axisX, Line);//设置横坐标axisX->setRange(categories.at(0), categories.at(categories.count()-1)); //这只坐标轴范围//数值型坐标作为纵轴QValueAxis *axisY = new QValueAxis;axisY->setRange(0, 100);axisY->setTitleText("分数");axisY->setTickCount(6);//11axisY->setLabelFormat("%.0f"); //标签格式
//    axisY->setGridLineVisible(false);
//    axisY->setMinorTickCount(4);chart->setAxisY(axisY, series); //为chart->setAxisY(axisY, Line);//    lineseries->setPointLabelsVisible(true);
//    lineseries->setPointLabelsFormat("@yPoint");chart->legend()->setVisible(true); //显示图例chart->legend()->setAlignment(Qt::AlignBottom); //图例显示在下方
}

绘制堆叠柱状图：

void MainWindow::iniStackedBar()
{//初始化叠加柱状图绘制窗口QChart *chart = new QChart();chart->setTitle("StackedBar 演示");chart->setAnimationOptions(QChart::SeriesAnimations);ui->chartViewStackedBar->setChart(chart);ui->chartViewStackedBar->setRenderHint(QPainter::Antialiasing);
}void MainWindow::buildStackedBar()
{//绘制叠加柱状图QChart *chart =ui->chartViewStackedBar->chart(); //获取QChart对象chart->removeAllSeries();//删除所有序列chart->removeAxis(chart->axisX()); //删除坐标轴chart->removeAxis(chart->axisY());//创建三门课程的数据集QBarSet *setMath = new QBarSet(theModel->horizontalHeaderItem(colNoMath)->text());QBarSet *setChinese = new QBarSet(theModel->horizontalHeaderItem(colNoChinese)->text());QBarSet *setEnglish= new QBarSet(theModel->horizontalHeaderItem(colNoEnglish)->text());for(int i=0;i<theModel->rowCount();i++){ //添加分数数据到数据集setMath->append(theModel->item(i,colNoMath)->text().toInt());setChinese->append(theModel->item(i,colNoChinese)->text().toInt());setEnglish->append(theModel->item(i,colNoEnglish)->text().toInt());}//创建   QStackedBarSeries对象并添加数据集QStackedBarSeries *series = new QStackedBarSeries();series->append(setMath);series->append(setChinese);series->append(setEnglish);series->setLabelsVisible(true);//显示每段的标签
//    series->setLabelsPosition(QAbstractBarSeries::LabelsCenter);// LabelsCenterchart->addSeries(series); //添加序列到图表QStringList categories;for (int i=0;i<theModel->rowCount();i++)categories <<theModel->item(i,colNoName)->text();QBarCategoryAxis *axisX = new QBarCategoryAxis(); //类别坐标轴，作为横轴axisX->append(categories);chart->setAxisX(axisX, series);axisX->setRange(categories.at(0), categories.at(categories.count()-1));QValueAxis *axisY = new QValueAxis; //数值坐标轴，作为纵轴axisY->setRange(0, 300);axisY->setTitleText("总分");axisY->setTickCount(6);axisY->setLabelFormat("%.0f"); //标签格式chart->setAxisY(axisY, series);chart->legend()->setVisible(true);chart->legend()->setAlignment(Qt::AlignBottom);
}

绘制百分比柱状图：

void MainWindow::iniPercentBar()
{//百分比柱状图初始化QChart *chart = new QChart();chart->setTitle("PercentBar 演示");chart->setAnimationOptions(QChart::SeriesAnimations);ui->chartViewPercentBar->setChart(chart);ui->chartViewPercentBar->setRenderHint(QPainter::Antialiasing);
}void MainWindow::buildPercentBar()
{//绘制百分比柱状图QChart *chart =ui->chartViewPercentBar->chart();chart->removeAllSeries();chart->removeAxis(chart->axisX());chart->removeAxis(chart->axisY());//创建数据集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; //节点QStringList categories;for (int i=0;i<=4;i++){//从分数段统计数据表里获取数据，添加到数据集item=ui->treeWidget->topLevelItem(i);categories<<item->text(0);//用作横坐标的标签setMath->append(item->text(colNoMath).toFloat());setChinese->append(item->text(colNoChinese).toFloat());setEnglish->append(item->text(colNoEnglish).toFloat());}QPercentBarSeries *series = new QPercentBarSeries(); //序列series->append(setMath);series->append(setChinese);series->append(setEnglish);series->setLabelsVisible(true);//显示百分比
//    series->setLabelsFormat("@value人");chart->addSeries(series);QBarCategoryAxis *axisX = new QBarCategoryAxis(); //横坐标axisX->append(categories);chart->setAxisX(axisX, series);axisX->setRange(categories.at(0), categories.at(categories.count()-1));QValueAxis *axisY = new QValueAxis;//纵坐标axisY->setRange(0, 100);axisY->setTitleText("百分比");axisY->setTickCount(6);axisY->setLabelFormat("%.1f"); //标签格式chart->setAxisY(axisY, series);chart->legend()->setVisible(true);chart->legend()->setAlignment(Qt::AlignRight); //AlignBottom
}

绘制散点图：

void MainWindow::iniScatterChart()
{//散点图初始化QChart *chart = new QChart();chart->setTitle("QScatterSeries 和 QSplineSeries 演示");chart->setAnimationOptions(QChart::SeriesAnimations);ui->chartViewScatter->setChart(chart);ui->chartViewScatter->setRenderHint(QPainter::Antialiasing);
}void MainWindow::buildScatterChart()
{ //绘制 QScatterSeries和QSplineSeries图QChart *chart =ui->chartViewScatter->chart();chart->removeAllSeries();chart->removeAxis(chart->axisX());chart->removeAxis(chart->axisY());QSplineSeries *seriesLine = new QSplineSeries(); //光滑曲线序列seriesLine->setName("spline");QPen pen;pen.setColor(Qt::blue);pen.setWidth(2);
//    seriesLine->setColor(Qt::blue);seriesLine->setPen(pen);QScatterSeries *series0 = new QScatterSeries(); //散点序列series0->setName("散点");series0->setMarkerShape(QScatterSeries::MarkerShapeCircle);//MarkerShapeRectangle,MarkerShapeCircleseries0->setBorderColor(Qt::black);series0->setBrush(QBrush(Qt::red));series0->setMarkerSize(12);qsrand(QTime::currentTime().second());//随机数种子for (int i=0;i<10;i++){int x=(qrand() % 20);//0到20之间的随机数int y=(qrand() % 20);series0->append(x,y); //散点序列seriesLine->append(x,y); //光滑曲线序列}chart->addSeries(series0);chart->addSeries(seriesLine);//    QValueAxis *axisY = new QValueAxis;
//    axisY->setRange(0, 20);
//    axisY->setTitleText("Y");
//    axisY->setTickCount(11);
//    axisY->setLabelFormat("%.0f"); //标签格式
//    axisY->setGridLineVisible(true);
//    chart->setAxisY(axisY, series0);
//    chart->setAxisY(axisY, seriesLine);//    QValueAxis *axisX = new QValueAxis;
//    axisX->setRange(0, 20);
//    axisX->setTitleText("X");
//    axisX->setTickCount(11);
//    axisX->setLabelFormat("%.0f"); //标签格式
//    axisX->setGridLineVisible(true);
//    chart->setAxisX(axisX, series0);
//    chart->setAxisX(axisX, seriesLine);chart->createDefaultAxes(); //创建缺省的坐标轴chart->axisX()->setTitleText("X 轴");chart->axisX()->setRange(-2,22);chart->axisY()->setTitleText("Y 轴");chart->axisY()->setRange(-2,22);chart->legend()->setVisible(true);chart->legend()->setAlignment(Qt::AlignRight); //AlignBottomforeach (QLegendMarker* marker, chart->legend()->markers()) {QObject::disconnect(marker, SIGNAL(clicked()), this, SLOT(on_chartBarLegendMarkerClicked()));QObject::connect(marker, SIGNAL(clicked()), this, SLOT(on_chartBarLegendMarkerClicked()));}}