图表工作簿

从工作簿设置图表数据

Aspose.Slides 提供了 ReadWorkbookStream 和 WriteWorkbookStream 方法，允许您读取和写入图表数据工作簿（包含与 Aspose.Cells 编辑的图表数据）。注意，图表数据必须以相同的方式组织或必须具有类似于源的结构。

auto pres = System::MakeObject<Presentation>(u"chart.pptx");

auto chart = System::ExplicitCast<Chart>(pres->get_Slides()->idx_get(0)->get_Shapes()->idx_get(0));
auto data = chart->get_ChartData();

System::SharedPtr<System::IO::MemoryStream> stream = data->ReadWorkbookStream();
data->get_Series()->Clear();
data->get_Categories()->Clear();

stream->set_Position(0);
data->WriteWorkbookStream(stream);

此 C++ 代码演示了设置图表数据工作簿的操作：

auto pres = System::MakeObject<Presentation>(u"Test.pptx");

auto chart = pres->get_Slides()->idx_get(0)->get_Shapes()->AddChart(Charts::ChartType::Pie, 50.0f, 50.0f, 500.0f, 400.0f);
chart->get_ChartData()->get_ChartDataWorkbook()->Clear(0);

intrusive_ptr<Aspose::Cells::IWorkbook> workbook;
try
{
    workbook = Aspose::Cells::Factory::CreateIWorkbook(new String("a1.xlsx"));
}
catch (Aspose::Cells::Systems::Exception& ex)
{
    System::Console::Write(System::String::FromWCS(ex.GetMessageExp()->value()));
}

intrusive_ptr<MemoryStream> cellsOutputStream = new Aspose::Cells::Systems::IO::MemoryStream();
workbook->Save(cellsOutputStream, Aspose::Cells::SaveFormat_Xlsx);

cellsOutputStream->SetPosition(0);
System::SharedPtr<System::IO::MemoryStream> msout = ToSlidesMemoryStream(cellsOutputStream);

chart->get_ChartData()->WriteWorkbookStream(msout);

chart->get_ChartData()->SetRange(u"Sheet1!$A$1:$B$9");
auto series = chart->get_ChartData()->get_Series()->idx_get(0);
series->get_ParentSeriesGroup()->set_IsColorVaried(true);
pres->Save(u"response2.pptx", Export::SaveFormat::Pptx);

将工作簿单元格设置为图表数据标签

1. 创建 Presentation 类的实例。
2. 通过索引获取幻灯片的引用。
3. 使用一些数据添加气泡图。
4. 访问图表系列。
5. 将工作簿单元格设置为数据标签。
6. 保存演示文稿。

此 C++ 代码显示您如何将工作簿单元格设置为图表数据标签：

System::String lbl0 = u"标签 0 单元格值";
System::String lbl1 = u"标签 1 单元格值";
System::String lbl2 = u"标签 2 单元格值";

// 实例化一个表示演示文稿文件的 Presentation 类 
auto pres = System::MakeObject<Presentation>(u"chart2.pptx");

auto slide = pres->get_Slides()->idx_get(0);

auto chart = pres->get_Slides()->idx_get(0)->get_Shapes()->AddChart(ChartType::Bubble, 50.0f, 50.0f, 600.0f, 400.0f, true);

auto series = chart->get_ChartData()->get_Series();

series->idx_get(0)->get_Labels()->get_DefaultDataLabelFormat()->set_ShowLabelValueFromCell(true);

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

series->idx_get(0)->get_Labels()->idx_get(0)->set_ValueFromCell(wb->GetCell(0, u"A10", System::ObjectExt::Box<System::String>(lbl0)));
series->idx_get(0)->get_Labels()->idx_get(1)->set_ValueFromCell(wb->GetCell(0, u"A11", System::ObjectExt::Box<System::String>(lbl1)));
series->idx_get(0)->get_Labels()->idx_get(2)->set_ValueFromCell(wb->GetCell(0, u"A12", System::ObjectExt::Box<System::String>(lbl2)));

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

管理工作表

此 C++ 代码演示了一个操作，其中 IChartDataWorkbook.Worksheets 属性用于访问工作表集合：

auto pres = System::MakeObject<Presentation>();
auto slide = pres->get_Slides()->idx_get(0);
auto chart = slide->get_Shapes()->AddChart(ChartType::Pie, 50.0f, 50.0f, 400.0f, 500.0f);
auto workbook = chart->get_ChartData()->get_ChartDataWorkbook();
auto worksheets = workbook->get_Worksheets();

for (auto ws : System::IterateOver(worksheets))
    System::Console::WriteLine(ws->get_Name());

指定数据源类型

此 C++ 代码向您展示如何为数据源指定类型：

auto pres = System::MakeObject<Presentation>();

auto chart = pres->get_Slides()->idx_get(0)->get_Shapes()->AddChart(ChartType::Column3D, 50.0f, 50.0f, 600.0f, 400.0f, true);
auto chartData = chart->get_ChartData();
auto val = chart->get_ChartData()->get_Series()->idx_get(0)->get_Name();

val->set_DataSourceType(DataSourceType::StringLiterals);
val->set_Data(System::ObjectExt::Box<System::String>(u"字面字符串"));
val = chartData->get_Series()->idx_get(1)->get_Name();
val->set_Data(chartData->get_ChartDataWorkbook()->GetCell(0, u"B1", System::ObjectExt::Box<System::String>(u"新单元格")));

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

外部工作簿

在 Aspose.Slides 19.4 中，我们实现了对外部工作簿作为图表数据源的支持。

创建外部工作簿

使用 ReadWorkbookStream 和 SetExternalWorkbook 方法，您可以从头开始创建外部工作簿或将内部工作簿设置为外部。

此 C++ 代码演示了外部工作簿创建过程：

auto pres = System::MakeObject<Presentation>();

const System::String workbookPath = u"externalWorkbook1.xlsx";

auto chart = pres->get_Slides()->idx_get(0)->get_Shapes()->AddChart(ChartType::Pie, 50.0f, 50.0f, 400.0f, 600.0f);
auto chartData = chart->get_ChartData();

{
    System::SharedPtr<System::IO::FileStream> fileStream = System::MakeObject<System::IO::FileStream>(workbookPath, System::IO::FileMode::Create);

    System::ArrayPtr<uint8_t> workbookData = chartData->ReadWorkbookStream()->ToArray();
    fileStream->Write(workbookData, 0, workbookData->get_Length());
}

chartData->SetExternalWorkbook(System::IO::Path::GetFullPath(workbookPath));

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

设置外部工作簿

使用 IChartData.SetExternalWorkbook 方法，您可以将外部工作簿分配给图表作为其数据源。此方法也可用于更新外部工作簿的路径（如果后者已被移动）。

尽管您无法编辑存储在远程位置或资源中的工作簿中的数据，但您仍然可以将这些工作簿用作外部数据源。如果提供了外部工作簿的相对路径，它会自动转换为完整路径。

此 C++ 代码显示您如何设置外部工作簿：

auto pres = System::MakeObject<Presentation>();

auto chart = pres->get_Slides()->idx_get(0)->get_Shapes()->AddChart(ChartType::Pie, 50.0f, 50.0f, 400.0f, 600.0f, false);
auto chartData = chart->get_ChartData();

chartData->SetExternalWorkbook(System::IO::Path::GetFullPath(u"externalWorkbook.xlsx"));

chartData->get_Series()->Add(chartData->get_ChartDataWorkbook()->GetCell(0, u"B1"), ChartType::Pie);
auto dataPoints = chartData->get_Series()->idx_get(0)->get_DataPoints();
auto workbook = chartData->get_ChartDataWorkbook();
dataPoints->AddDataPointForPieSeries(workbook->GetCell(0, u"B2"));
dataPoints->AddDataPointForPieSeries(workbook->GetCell(0, u"B3"));
dataPoints->AddDataPointForPieSeries(workbook->GetCell(0, u"B4"));

auto categories = chartData->get_Categories();
categories->Add(workbook->GetCell(0, u"A2"));
categories->Add(workbook->GetCell(0, u"A3"));
categories->Add(workbook->GetCell(0, u"A4"));
pres->Save(u"Presentation_with_externalWorkbook.pptx", SaveFormat::Pptx);

updateChartData 参数（在 SetExternalWorkbook 方法下）用于指定是否将加载 Excel 工作簿。

• 当 updateChartData 值设置为 false 时，仅更新工作簿路径——图表数据不会从目标工作簿中加载或更新。您可能希望在目标工作簿不存在或不可用的情况下使用该设置。
• 当 updateChartData 值设置为 true 时，从目标工作簿更新图表数据。

auto pres = System::MakeObject<Presentation>();
auto slide = pres->get_Slides()->idx_get(0);
auto chart = slide->get_Shapes()->AddChart(ChartType::Pie, 50.0f, 50.0f, 400.0f, 600.0f, true);
System::SharedPtr<IChartData> chartData = chart->get_ChartData();

System::SharedPtr<ChartData> concreteChartData = System::AsCast<ChartData>(chartData);
concreteChartData->SetExternalWorkbook(u"http://path/doesnt/exists", false);

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

获取图表外部数据源工作簿路径

1. 创建 Presentation 类的实例。
2. 通过索引获取幻灯片的引用。
3. 为图表形状创建一个对象。
4. 创建一个表示图表数据源的源（ChartDataSourceType）类型的对象。
5. 根据源类型与外部工作簿数据源类型相同的相关条件。

此 C++ 代码演示了操作：

auto pres = System::MakeObject<Presentation>(u"pres.pptx");

auto slide = pres->get_Slides()->idx_get(1);
auto chart = System::ExplicitCast<IChart>(slide->get_Shapes()->idx_get(0));
ChartDataSourceType sourceType = chart->get_ChartData()->get_DataSourceType();
if (sourceType == ChartDataSourceType::ExternalWorkbook)
{
    System::String path = chart->get_ChartData()->get_ExternalWorkbookPath();
}

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

编辑图表数据

您可以以与更改内部工作簿内容相同的方式编辑外部工作簿中的数据。当无法加载外部工作簿时，会抛出异常。

此 C++ 代码是对描述过程的实现：

const String templatePath = u"../templates/presentation.pptx";
	const String outPath = u"../out/presentation-out.pptx";
	

	System::SharedPtr<Presentation> pres = System::MakeObject<Presentation>(templatePath);
	System::SharedPtr<Aspose::Slides::Charts::IChart> chart = System::AsCast<Aspose::Slides::Charts::IChart>(pres->get_Slides()->idx_get(0)->get_Shapes()->idx_get(0));
	System::SharedPtr<Aspose::Slides::Charts::ChartData> chartData = System::ExplicitCast<Aspose::Slides::Charts::ChartData>(chart->get_ChartData());
	

	chartData->get_Series()->idx_get(0)->get_DataPoints()->idx_get(0)->get_Value()->get_AsCell()->set_Value(System::ObjectExt::Box<int32_t>(100));
	pres->Save(outPath, Aspose::Slides::Export::SaveFormat::Pptx);