Qt-绘制图表
作者：互联网
1 简介
使用Qt的charts模块来绘制图表，案例来自Qt自带的demo。
charts模块简介：Qt Chars模块提供了一系列容易使用的图表组件。需要使用charts组件时，需要导入Qt Charts模块，通过如下方式：QT += charts
在安装Qt Creator的时候，需要勾选上这个模块，不然是不能使用的。
2 Qt Charts总览
Qt Chars支持绘制：坐标图、柱状图、折线图、饼图、曲线图、散点图等。
3 测试及说明
首先创建一个工程，继承至MainWindow组件。
（1）绘制折线图
折线图通过线段展示一系列相关联的点。
使用的类：QLineSeries
测试代码：
1 MainWindow::MainWindow(QWidget *parent) :
2 QMainWindow(parent),
3 ui(new Ui::MainWindow)
4 {
5 ui->setupUi(this);
6
7 /*
8 * LineChart Example
9 */
10 //添加一个QLineSeries实例
11 QLineSeries *lineseries = new QLineSeries();
12 //添加数据（点），有两种方式
13 lineseries->append(0, 6); //参数分别为横纵坐标
14 lineseries->append(2, 4);
15 lineseries->append(3, 8);
16 lineseries->append(7, 4);
17 *lineseries << QPointF(11, 1) << QPointF(13, 3) << QPointF(17, 6) << QPointF(18, 3) << QPointF(20, 2);
18 //添加一个QChart实例，为了展示数据
19 QChart *chart = new QChart();
20 chart->legend()->hide(); //隐藏图例
21 chart->addSeries(lineseries);
22 chart->createDefaultAxes();
23 chart->setTitle("Simple line chart example");
24 //添加一个QChartView图例
25 QChartView *chartView = new QChartView(chart);
26 chartView->setRenderHint(QPainter::Antialiasing); //呈现方式
27 //显示
28 this->setCentralWidget(chartView);
29 this->setCentralWidget(chartView);
30 this->resize(400, 300);
31 this->show();
32 }
运行测试：
（2）绘制曲线图
使用的类：QSplineSeries
测试代码：
1 QSplineSeries *series = new QSplineSeries();
2 series->setName("spline");
3 series->append(0, 6);
4 series->append(2, 4);
5 series->append(3, 8);
6 series->append(7, 4);
7 series->append(10, 5);
8
9 QChart *chart = new QChart();
10 chart->legend()->hide();
11 chart->addSeries(series);
12 chart->setTitle("Simple spline chart example");
13 chart->createDefaultAxes();
14 chart->axisY()->setRange(0, 10);
15
16 QChartView *chartView = new QChartView(chart);
17 chartView->setRenderHint(QPainter::Antialiasing);
18
19 this->setCentralWidget(chartView);
20 this->setCentralWidget(chartView);
21 this->resize(400, 300);
22 this->show();
运行测试：
（3）绘制面积图
使用的类：LineChart
测试代码：
1 QLineSeries *series0 = new QLineSeries();
2 QLineSeries *series1 = new QLineSeries();
3 *series0 << QPointF(1, 5) << QPointF(3, 7) << QPointF(7, 6) << QPointF(9, 7) << QPointF(12, 6)
4 << QPointF(16, 7) << QPointF(18, 5);
5 *series1 << QPointF(1, 3) << QPointF(3, 4) << QPointF(7, 3) << QPointF(8, 2) << QPointF(12, 3)
6 << QPointF(16, 4) << QPointF(18, 3);
7
8 QAreaSeries *series = new QAreaSeries(series0, series1);
9 series->setName("Batman");
10 QPen pen(0x059605);
11 pen.setWidth(3);
12 series->setPen(pen);
13
14 QChart *chart = new QChart();
15 chart->addSeries(series);
16 chart->setTitle("Simple areachart example");
17 chart->createDefaultAxes();
18 chart->axisX()->setRange(0, 20);
19 chart->axisY()->setRange(0, 10);
20
21 QChartView *chartView = new QChartView(chart);
22 chartView->setRenderHint(QPainter::Antialiasing);
23
24 this->setCentralWidget(chartView);
25 this->setCentralWidget(chartView);
26 this->resize(400, 300);
27 this->show();
运行测试：
（4）绘制散点图
使用的类： QScatterSeries
测试代码：
1 QScatterSeries *series0 = new QScatterSeries();
2 series0->setName("scatter1");
3 series0->setMarkerShape(QScatterSeries::MarkerShapeCircle);
4 series0->setMarkerSize(5.0);
5
6 QScatterSeries *series1 = new QScatterSeries();
7 series1->setName("scatter2");
8 series1->setMarkerShape(QScatterSeries::MarkerShapeRectangle);
9 series1->setMarkerSize(10.0);
10
11 QScatterSeries *series2 = new QScatterSeries();
12 series2->setName("scatter3");
13 series2->setMarkerShape(QScatterSeries::MarkerShapeRectangle);
14 series2->setMarkerSize(15.0);
15
16 series0->append(0, 6);
17 series0->append(2, 4);
18 series0->append(3, 8);
19 series0->append(7, 4);
20 series0->append(10, 5);
21 *series1 << QPointF(1, 1) << QPointF(3, 3) << QPointF(7, 6) << QPointF(8, 3) << QPointF(10, 2);
22 *series2 << QPointF(1, 5) << QPointF(4, 6) << QPointF(6, 3) << QPointF(9, 5);
23
24 QChart *chart = new QChart();
25 chart->addSeries(series0);
26 chart->addSeries(series1);
27 chart->addSeries(series2);
28 chart->setTitle("Simple scatterchart example");
29 chart->createDefaultAxes();
30 chart->setDropShadowEnabled(false);
31
32 QChartView *chartView = new QChartView(chart);
33 chartView->setRenderHint(QPainter::Antialiasing);
34
35 this->setCentralWidget(chartView);
36 this->resize(400, 300);
37 this->show();
运行测试：
（5）绘制柱状图
使用的类：
测试代码：
1 QBarSet *set0 = new QBarSet("Jane");
2 QBarSet *set1 = new QBarSet("John");
3 QBarSet *set2 = new QBarSet("Axel");
4 QBarSet *set3 = new QBarSet("Mary");
5 QBarSet *set4 = new QBarSet("Samantha");
6
7 *set0 << 1 << 2 << 3 << 4 << 5 << 6;
8 *set1 << 5 << 0 << 0 << 4 << 0 << 7;
9 *set2 << 3 << 5 << 8 << 13 << 8 << 5;
10 *set3 << 5 << 6 << 7 << 3 << 4 << 5;
11 *set4 << 9 << 7 << 5 << 3 << 1 << 2;
12
13 QBarSeries *series = new QBarSeries();
14 series->append(set0);
15 series->append(set1);
16 series->append(set2);
17 series->append(set3);
18 series->append(set4);
19
20 QChart *chart = new QChart();
21 chart->addSeries(series);
22 chart->setTitle("Simple barchart example");
23 chart->setAnimationOptions(QChart::SeriesAnimations);
24
25 QStringList categories;
26 categories << "Jan" << "Feb" << "Mar" << "Apr" << "May" << "Jun";
27 QBarCategoryAxis *axis = new QBarCategoryAxis();
28 axis->append(categories);
29 chart->createDefaultAxes();
30 chart->setAxisX(axis, series);
31
32 chart->legend()->setVisible(true);
33 chart->legend()->setAlignment(Qt::AlignBottom);
34
35 QChartView *chartView = new QChartView(chart);
36 chartView->setRenderHint(QPainter::Antialiasing);
37
38 this->setCentralWidget(chartView);
39 this->resize(400, 300);
40 this->show();
运行测试：
（6）绘制饼图
使用的类：QPieSeries
测试代码：
1 QPieSeries *series = new QPieSeries();
2 series->append("Jane", 1);
3 series->append("Joe", 2);
4 series->append("Andy", 3);
5 series->append("Barbara", 4);
6 series->append("Axel", 5);
7
8 QPieSlice *slice = series->slices().at(1);
9 slice->setExploded();
10 slice->setLabelVisible();
11 slice->setPen(QPen(Qt::darkGreen, 2));
12 slice->setBrush(Qt::green);
13
14 QChart *chart = new QChart();
15 chart->addSeries(series);
16 chart->setTitle("Simple piechart example");
17 chart->legend()->hide();
18
19 QChartView *chartView = new QChartView(chart);
20 chartView->setRenderHint(QPainter::Antialiasing);
21
22 this->setCentralWidget(chartView);
23 this->resize(400, 300);
24 this->show();
运行测试：
标签：Qt,series,chart,图表,new,chartView,绘制,QChartView,append 来源： https://www.cnblogs.com/mrlayfolk/p/13375358.html