Qt QChart 创建图表

Qt QChart 创建图表

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目录

效果

流程

graph LR q(value 数据) q–>s1(QPieSlice)–>ps(QPieSeries)–饼状图–>c(QChart)–>v(QChartView)–>w(QWidget) q–>s2(…)–>ps q–>bs(QBarSet)–>b(QBarSeries)–柱状图–>c q–>bs1(…)–>b q–>p(QPointF)–>l(QLineSeries/QSplineSeries)–折/曲线图–>c q–>p1(…)–>l l1(QLineSeries upper)–>a(QAreaSeries)–区域图–>c l2(QLineSeries lower)–>a

代码

1. 饼图

// 保存多个扇形
QList<QPieSlice *> slices;
for (int i = 1; i <= 10; ++i)
{
// 创建一个扇形
QPieSlice * slice = new QPieSlice(QString::number(i),i);
slices << slice;
}
// 创建一个饼图系列
QPieSeries * pieSeries = new QPieSeries;
// 当鼠标悬浮时设置标签可见,设置饼图扇形分离
QObject::connect(pieSeries,&QPieSeries::hovered
, [](QPieSlice *slice, bool state) {
slice->setLabelVisible(state);
slice->setExploded(state);
});
// 将所有扇形所加到饼图中
pieSeries->append(slices);
// 创建一个图表
QChart * chart = new QChart;
// 设置标题
chart->setTitle(QStringLiteral("饼图"));
// 设置动画
chart->setAnimationOptions(QChart::AllAnimations);
// 设置图表的系列
chart->addSeries(pieSeries);
// 创建图表视图,显示图表
pView = new QChartView(chart);
// 设置抗锯齿
pView->setRenderHint(QPainter::Antialiasing);
// 添加图表视图到布局
QVBoxLayout *layout = new QVBoxLayout(this);
layout->addWidget(pView);

2. 柱图

// 保存柱集合
QList<QBarSet *> sets;
for (int i = 1; i <= 5; ++i)
{
// 创建一个柱集合
QBarSet * set = new QBarSet(QString("set").append(QString::number(i)));
QList<qreal> values;
for (int j = 1; j <= 5; ++j)
{
values << qrand()%100;
qDebug() << values;
}
set->append(values);
sets << set;
}
// 创建一个柱图系列
QBarSeries * barSeries = new QBarSeries;
// 添加柱集合
barSeries->append(sets);
QChart * chart = new QChart;
chart->setTitle(QStringLiteral("柱状图"));
chart->setAnimationOptions(QChart::AllAnimations);
chart->addSeries(barSeries);
pView = new QChartView(chart);
pView->setRenderHint(QPainter::Antialiasing);
QVBoxLayout *layout = new QVBoxLayout(this);
layout->addWidget(pView);

3. 折/曲线图

// 创建并保存点信息
QList<QPointF> points;
points << QPointF(0, -1) << QPointF(2, 2) << QPointF(3, 5) << QPointF(5, -5)
<< QPointF(6, 0) << QPointF(7, 3);
// 创建线图系列
QLineSeries * lineSeries = new QLineSeries;
// 曲线
//QSplineSeries * lineSeries = new QSplineSeries;
// 追加点
lineSeries->append(points);
QChart * chart = new QChart;
chart->setTitle(QStringLiteral("线图"));
chart->setAnimationOptions(QChart::AllAnimations);
chart->addSeries(lineSeries);
pView = new QChartView(chart);
pView->setRenderHint(QPainter::Antialiasing);
QVBoxLayout *layout = new QVBoxLayout(this);
layout->addWidget(pView);

4. 区域图

QList<QPointF> pointsLower;
pointsLower << QPointF(0, -1) << QPointF(2, 2) << QPointF(3, 5) << QPointF(5, -5)
<< QPointF(6, 0) << QPointF(7, 3);
// 创建一条线
QLineSeries * lineSeriesLower = new QLineSeries;
lineSeriesLower->append(pointsLower);
QList<QPointF> pointsUpper;
pointsUpper << QPointF(0, -1) << QPointF(2, 4) << QPointF(3, 3) << QPointF(5, 3)
<< QPointF(6, 1) << QPointF(7, 5);
// 创建另一条线
QLineSeries * lineSeriesUpper = new QLineSeries;
lineSeriesUpper->append(pointsUpper);
// 两条线组成面
QAreaSeries * areaSeries = new QAreaSeries(lineSeriesLower, lineSeriesUpper);
QChart * chart = new QChart;
chart->setTitle(QStringLiteral("区域图"));
chart->setAnimationOptions(QChart::AllAnimations);
chart->addSeries(areaSeries);
pView = new QChartView(chart);
pView->setRenderHint(QPainter::Antialiasing);
QVBoxLayout *layout = new QVBoxLayout(this);
layout->addWidget(pView);
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