图表计算

计算图表元素的实际值

Aspose.Slides for C++ 提供了一个简单的 API 来获取这些属性。这将帮助您计算图表元素的实际值。实际值包括实现 IActualLayout 接口的元素的位置（IActualLayout::get_ActualX(), IActualLayout::get_ActualY(), IActualLayout::get_ActualWidth(), IActualLayout::get_ActualHeight()）和实际的轴值（IAxis::get_ActualMaxValue(), IAxis::get_ActualMinValue(), IAxis::get_ActualMajorUnit(), IAxis::get_ActualMinorUnit(), IAxis::get_ActualMajorUnitScale(), IAxis::get_ActualMinorUnitScale()）。

auto pres = System::MakeObject<Presentation>(u"test.pptx");
    
auto chart = System::ExplicitCast<Chart>(pres->get_Slides()->idx_get(0)->get_Shapes()->AddChart(ChartType::ClusteredColumn, 100.0f, 100.0f, 500.0f, 350.0f));
chart->ValidateChartLayout();

double x = chart->get_PlotArea()->get_ActualX();
double y = chart->get_PlotArea()->get_ActualY();
double w = chart->get_PlotArea()->get_ActualWidth();
double h = chart->get_PlotArea()->get_ActualHeight();

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

计算父图表元素的实际位置

Aspose.Slides for C++ 提供了一个简单的 API 来获取这些属性。IActualLayout 的方法提供有关父图表元素实际位置的信息。必须先调用方法 IChart::ValidateChartLayout()，以填充实际值的属性。

// 创建空演示文稿
auto pres = System::MakeObject<Presentation>();

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

double x = chart->get_PlotArea()->get_ActualX();
double y = chart->get_PlotArea()->get_ActualY();
double w = chart->get_PlotArea()->get_ActualWidth();
double h = chart->get_PlotArea()->get_ActualHeight();

隐藏图表中的信息

本主题帮助您了解如何隐藏图表中的信息。使用 Aspose.Slides for C++，您可以从图表中隐藏 标题、纵轴、横轴 和 网格线。以下代码示例显示了如何使用这些属性。

	// The path to the documents directory.
	const String outPath = u"../out/HideInformationFromChart.pptx";

	// Load the desired the presentation
	SharedPtr<Presentation> pres = MakeObject<Presentation>();



	SharedPtr<IChart> chart = pres->get_Slides()->idx_get(0)->get_Shapes()->AddChart(ChartType::LineWithMarkers, 140, 118, 320, 370);
	

	//Hiding chart Title
	chart->set_HasTitle(false);

	///Hiding Values axis
	chart->get_Axes()->get_VerticalAxis()->set_IsVisible(false);

	//Category Axis visibility
	chart->get_Axes()->get_HorizontalAxis()->set_IsVisible(false);

	//Hiding Legend
	chart->set_HasLegend(false);

	//Hiding MajorGridLines
	chart->get_Axes()->get_HorizontalAxis()->get_MajorGridLinesFormat()->get_Line()->get_FillFormat()->set_FillType(FillType::NoFill);

	for (int i = 0; i < chart->get_ChartData()->get_Series()->get_Count(); i++)
	{
		chart->get_ChartData()->get_Series()->RemoveAt(i);
	}

	SharedPtr<IChartSeries> series = chart->get_ChartData()->get_Series()->idx_get(0);
	

	series->get_Marker()->set_Symbol(MarkerStyleType::Circle);
	series->get_Labels()->get_DefaultDataLabelFormat()->set_ShowValue(true);
	series->get_Labels()->get_DefaultDataLabelFormat()->set_Position(LegendDataLabelPosition::Top);
	series->get_Marker()->set_Size(15);

	//Setting series line color
	series->get_Format()->get_Line()->get_FillFormat()->set_FillType(FillType::Solid);
	series->get_Format()->get_Line()->get_FillFormat()->get_SolidFillColor()->set_Color(Color::get_Magenta());
	series->get_Format()->get_Line()->set_DashStyle(LineDashStyle::Solid);

	//Write the PPTX to Disk
	pres->Save(outPath, Aspose::Slides::Export::SaveFormat::Pptx);

为图表设置数据范围

Aspose.Slides for C++ 提供了最简单的 API，以最简单的方式为图表设置数据范围。要为图表设置数据范围：

• 打开包含图表的 Presentation 类的实例。
• 通过使用其索引获取幻灯片的引用。
• 遍历所有形状以找到所需的图表。
• 访问图表数据并设置范围。
• 将修改后的演示文稿保存为 PPTX 文件。

以下代码示例展示了如何更新图表。

For complete examples and data files, please go to https://github.com/aspose-slides/Aspose.Slides-for-C

	// The path to the documents directory.
	const String templatePath = u"../templates/ExistingChart.pptx";
	const String outPath = u"../out/DataRange_out.pptx";

	//Instantiate Presentation class that represents PPTX file
	SharedPtr<Presentation> pres = MakeObject<Presentation>(templatePath);

	//Access first slide
	SharedPtr<ISlide> slide = pres->get_Slides()->idx_get(0);

	// Add chart with default data
//	SharedPtr<IChart> chart = DynamicCast<Aspose::Slides::Charts::IChart>(slide->get_Shapes()->idx_get(0));
	auto chart = DynamicCast<Aspose::Slides::Charts::Chart>(slide->get_Shapes()->idx_get(0));

	//Not working


	//Set data range	
//	chart->get_ChartData()->SetRange("Sheet1!A1:B4");

	// Write the presentation file to disk
	pres->Save(outPath, Aspose::Slides::Export::SaveFormat::Pptx);