示例可以设置图表的系统内置主题。
0x00 主题样式预览
0x01 创建图表
以面积图为例。
QChart *chart =newQChart();
chart->setTitle("Area chart");
创建QLineSeries与QAreaSeries实例装载数据。
for(inti(0); i < m_dataTable.count(); i++){
QLineSeries *upperSeries =newQLineSeries(chart);
for(intj(0); j < m_dataTable[i].count(); j++){
Data data = m_dataTable[i].at(j);
if(lowerSeries){
const QVector<QPointF>& points = lowerSeries->pointsVector();
upperSeries->append(QPointF(j, points[i].y()+ data.first.y()));
}else{
upperSeries->append(QPointF(j, data.first.y()));
}
}
QAreaSeries *area =newQAreaSeries(upperSeries, lowerSeries);
area->setName(name + QString::number(nameIndex));
nameIndex++;
chart->addSeries(area);
lowerSeries = upperSeries;
}
chart->createDefaultAxes();
chart->axes(Qt::Horizontal).first()->setRange(0, m_valueCount -1);
chart->axes(Qt::Vertical).first()->setRange(0, m_valueMax);
QValueAxis *axisY = qobject_cast<QValueAxis*>(chart->axes(Qt::Vertical).first());
Q_ASSERT(axisY);
axisY->setLabelFormat("%.1f ");
0x02 设置主题
用户可以可以选择系统中的内置主题。然后将此主题应用于布局中的所有图表。
// add items to theme combobox
m_ui->themeComboBox->addItem("Light", QChart::ChartThemeLight);
m_ui->themeComboBox->addItem("Blue Cerulean", QChart::ChartThemeBlueCerulean);
m_ui->themeComboBox->addItem("Dark", QChart::ChartThemeDark);
m_ui->themeComboBox->addItem("Brown Sand", QChart::ChartThemeBrownSand);
m_ui->themeComboBox->addItem("Blue NCS", QChart::ChartThemeBlueNcs);
m_ui->themeComboBox->addItem("High Contrast", QChart::ChartThemeHighContrast);
m_ui->themeComboBox->addItem("Blue Icy", QChart::ChartThemeBlueIcy);
m_ui->themeComboBox->addItem("Qt", QChart::ChartThemeQt);
QChart::ChartTheme theme =static_cast<QChart::ChartTheme>(
m_ui->themeComboBox->itemData(m_ui->themeComboBox->currentIndex()).toInt());
//![6]
constauto charts = m_charts;
if(!m_charts.isEmpty()&& m_charts.at(0)->chart()->theme()!= theme){
for(QChartView *chartView : charts){
//![7]
chartView->chart()->setTheme(theme);
0x03 设置图表动画
可以设置每个图表上动画类型。
没有动画；
网格轴动画；
系列动画；
或者两者都有。
m_ui->animatedComboBox->addItem("No Animations", QChart::NoAnimation);
m_ui->animatedComboBox->addItem("GridAxis Animations", QChart::GridAxisAnimations);
m_ui->animatedComboBox->addItem("Series Animations", QChart::SeriesAnimations);
m_ui->animatedComboBox->addItem("All Animations", QChart::AllAnimations);
QChart::AnimationOptions options(
m_ui->animatedComboBox->itemData(m_ui->animatedComboBox->currentIndex()).toInt());
if(!m_charts.isEmpty()&& m_charts.at(0)->chart()->animationOptions()!= options){
for(QChartView *chartView : charts)
chartView->chart()->setAnimationOptions(options);
}
0x04 设置图表额外信息
显示图表的额外信息在不同侧面。
m_ui->legendComboBox->addItem("No Legend ",0);
m_ui->legendComboBox->addItem("Legend Top", Qt::AlignTop);
m_ui->legendComboBox->addItem("Legend Bottom", Qt::AlignBottom);
m_ui->legendComboBox->addItem("Legend Left", Qt::AlignLeft);
m_ui->legendComboBox->addItem("Legend Right", Qt::AlignRight);
Qt::Alignment alignment(
m_ui->legendComboBox->itemData(m_ui->legendComboBox->currentIndex()).toInt());
if(!alignment){
for(QChartView *chartView : charts)
chartView->chart()->legend()->hide();
}else{
for(QChartView *chartView : charts){
chartView->chart()->legend()->setAlignment(alignment);
chartView->chart()->legend()->show();
}
}
0x05 图表抗锯齿
抗锯齿开启后会对性能造成影像但会改善显示效果。
bool checked = m_ui->antialiasCheckBox->isChecked();
for(QChartView *chart : charts)
chart->setRenderHint(QPainter::Antialiasing, checked);
0x06 关于更多
C:\Qt\{你的Qt版本}\Examples\{你的Qt版本}\charts\chartthemes
https://doc.qt.io/qt-5/qtcharts-chartthemes-example.html
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