图表坐标轴

获取图表垂直坐标轴的最大值

Aspose.Slides for C++ 允许您获取垂直坐标轴上的最小值和最大值。请按照以下步骤操作：

1. 创建一个 Presentation 类的实例。
2. 访问第一张幻灯片。
3. 添加一个带有默认数据的图表。
4. 获取坐标轴上的实际最大值。
5. 获取坐标轴上的实际最小值。
6. 获取坐标轴上的实际主要单位。
7. 获取坐标轴上的实际次要单位。
8. 获取坐标轴上的实际主要单位刻度。
9. 获取坐标轴上的实际次要单位刻度。

下面的示例代码展示了如何在 C++ 中获取所需的值：

auto pres = System::MakeObject<Presentation>();
auto shapes = pres->get_Slides()->idx_get(0)->get_Shapes();
auto chart = System::ExplicitCast<Chart>(shapes->AddChart(ChartType::Area, 100.0f, 100.0f, 500.0f, 350.0f));
chart->ValidateChartLayout();

auto axes = chart->get_Axes();

double maxValue = axes->get_VerticalAxis()->get_ActualMaxValue();
double minValue = axes->get_VerticalAxis()->get_ActualMinValue();

double majorUnit = axes->get_HorizontalAxis()->get_ActualMajorUnit();
double minorUnit = axes->get_HorizontalAxis()->get_ActualMinorUnit();

// 保存演示文稿
pres->Save(u"ErrorBars_out.pptx", SaveFormat::Pptx);

交换坐标轴之间的数据

Aspose.Slides 允许您快速交换坐标轴之间的数据——在垂直坐标轴 (y 轴) 上表示的数据移动到水平坐标轴 (x 轴)，反之亦然。

这段 C++ 代码展示了如何在图表上执行坐标轴间的数据交换任务：

// 创建空演示文稿
auto pres = System::MakeObject<Presentation>();
auto shapes = pres->get_Slides()->idx_get(0)->get_Shapes();
auto chart = shapes->AddChart(ChartType::ClusteredColumn, 100.0f, 100.0f, 400.0f, 300.0f);

// 切换行和列
chart->get_ChartData()->SwitchRowColumn();

// 保存演示文稿
pres->Save(u"SwitchChartRowColumns_out.pptx", SaveFormat::Pptx);

禁用折线图的垂直坐标轴

这段 C++ 代码展示了如何隐藏折线图的垂直坐标轴：

auto pres = System::MakeObject<Presentation>();
auto shapes = pres->get_Slides()->idx_get(0)->get_Shapes();
auto chart = shapes->AddChart(ChartType::Line, 100.0f, 100.0f, 400.0f, 300.0f);
chart->get_Axes()->get_VerticalAxis()->set_IsVisible(false);

pres->Save(u"chart.pptx", SaveFormat::Pptx);

禁用折线图的水平坐标轴

这段代码展示了如何隐藏折线图的水平坐标轴：

auto pres = System::MakeObject<Presentation>();
auto shapes = pres->get_Slides()->idx_get(0)->get_Shapes();
auto chart = shapes->AddChart(ChartType::Line, 100.0f, 100.0f, 400.0f, 300.0f);
chart->get_Axes()->get_HorizontalAxis()->set_IsVisible(false);

pres->Save(u"chart.pptx", SaveFormat::Pptx);

更改类别轴

使用 set_CategoryAxisType() 方法，您可以指定首选的类别轴类型 (日期 或 文本)。以下 C++ 代码演示了此操作：

auto presentation = System::MakeObject<Presentation>(u"ExistingChart.pptx");
auto chart = System::AsCast<IChart>(presentation->get_Slides()->idx_get(0)->get_Shapes()->idx_get(0));
auto horizontalAxis = chart->get_Axes()->get_HorizontalAxis();

horizontalAxis->set_CategoryAxisType(CategoryAxisType::Date);
horizontalAxis->set_IsAutomaticMajorUnit(false);
horizontalAxis->set_MajorUnit(1);
horizontalAxis->set_MajorUnitScale(TimeUnitType::Months);

presentation->Save(u"ChangeChartCategoryAxis_out.pptx", SaveFormat::Pptx);

设置类别轴值的日期格式

Aspose.Slides for C++ 允许您设置类别轴值的日期格式。此操作在以下 C++ 代码中演示：

auto pres = System::MakeObject<Presentation>();
auto chart = pres->get_Slides()->idx_get(0)->get_Shapes()->AddChart(ChartType::Area, 50.0f, 50.0f, 450.0f, 300.0f);

auto wb = chart->get_ChartData()->get_ChartDataWorkbook();

wb->Clear(0);

chart->get_ChartData()->get_Series()->Clear();
auto areaCategories = chart->get_ChartData()->get_Categories();
areaCategories->Clear();
areaCategories->Add(wb->GetCell(0, u"A2", ObjectExt::Box<double>(DateTime(2015, 1, 1).ToOADate())));
areaCategories->Add(wb->GetCell(0, u"A3", ObjectExt::Box<double>(DateTime(2016, 1, 1).ToOADate())));
areaCategories->Add(wb->GetCell(0, u"A4", ObjectExt::Box<double>(DateTime(2017, 1, 1).ToOADate())));
areaCategories->Add(wb->GetCell(0, u"A5", ObjectExt::Box<double>(DateTime(2018, 1, 1).ToOADate())));

auto series = chart->get_ChartData()->get_Series()->Add(ChartType::Line);
auto dataPoints = series->get_DataPoints();
dataPoints->AddDataPointForLineSeries(wb->GetCell(0, u"B2", ObjectExt::Box<int32_t>(1)));
dataPoints->AddDataPointForLineSeries(wb->GetCell(0, u"B3", ObjectExt::Box<int32_t>(2)));
dataPoints->AddDataPointForLineSeries(wb->GetCell(0, u"B4", ObjectExt::Box<int32_t>(3)));
dataPoints->AddDataPointForLineSeries(wb->GetCell(0, u"B5", ObjectExt::Box<int32_t>(4)));

auto horizontalAxis = chart->get_Axes()->get_HorizontalAxis();
horizontalAxis->set_CategoryAxisType(CategoryAxisType::Date);
horizontalAxis->set_IsNumberFormatLinkedToSource(false);
horizontalAxis->set_NumberFormat(u"yyyy");

pres->Save(u"test.pptx", SaveFormat::Pptx);

设置图表坐标轴标题的旋转角度

Aspose.Slides for C++ 允许您设置图表坐标轴标题的旋转角度。以下 C++ 代码演示了此操作：

auto pres = System::MakeObject<Presentation>();
auto shapes = pres->get_Slides()->idx_get(0)->get_Shapes();
auto chart = shapes->AddChart(ChartType::ClusteredColumn, 50.0f, 50.0f, 450.0f, 300.0f);
auto verticalAxis = chart->get_Axes()->get_VerticalAxis();
verticalAxis->set_HasTitle(true);
verticalAxis->get_Title()->get_TextFormat()->get_TextBlockFormat()->set_RotationAngle(90.0f);

pres->Save(u"test.pptx", SaveFormat::Pptx);

在类别轴或值轴中设置位置轴

Aspose.Slides for C++ 允许您在类别轴或值轴中设置位置轴。以下 C++ 代码展示了如何执行此任务：

auto pres = System::MakeObject<Presentation>();
auto shapes = pres->get_Slides()->idx_get(0)->get_Shapes();
auto chart = shapes->AddChart(ChartType::ClusteredColumn, 50.0f, 50.0f, 450.0f, 300.0f);
chart->get_Axes()->get_HorizontalAxis()->set_AxisBetweenCategories(true);

pres->Save(u"AsposeScatterChart.pptx", SaveFormat::Pptx);

在图表值轴上启用显示单位标签

Aspose.Slides for C++ 允许您配置图表以在其值轴上显示单位标签。以下 C++ 代码演示了此操作：

auto pres = System::MakeObject<Presentation>(u"Test.pptx");
auto shapes = pres->get_Slides()->idx_get(0)->get_Shapes();
auto chart = shapes->AddChart(ChartType::ClusteredColumn, 50.0f, 50.0f, 450.0f, 300.0f);
chart->get_Axes()->get_VerticalAxis()->set_DisplayUnit(DisplayUnitType::Millions);

pres->Save(u"Result.pptx", SaveFormat::Pptx);