Callout

Using Callout

New property ShowLabelAsDataCallout has been added to DataLabelFormat class and IDataLabelFormat interface, which determines either specified chart’s data label will be displayed as data callout or as data label. In the example given below, we have set the Callouts.

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 outPath = u"../out/DisplayChartLabels_out.pptx";

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

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

	// Add chart with default data
	SharedPtr<IChart> chart = slide->get_Shapes()->AddChart(Aspose::Slides::Charts::ChartType::Pie, 0, 0, 500, 500);

	chart->get_ChartData()->get_Series()->idx_get(0)->get_Labels()->get_DefaultDataLabelFormat()->set_ShowValue ( true);
	chart->get_ChartData()->get_Series()->idx_get(0)->get_Labels()->get_DefaultDataLabelFormat()->set_ShowLabelAsDataCallout( true);
	chart->get_ChartData()->get_Series()->idx_get(0)->get_Labels()->idx_get(2)->get_DataLabelFormat()->set_ShowLabelAsDataCallout ( false);

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

Set Callout for Doughnut Chart

Aspose.Slides for C++ provides support for setting series data label callout shape for a Doughnut chart. Below sample example is given.

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 outPath = u"../out/AddDoughnutCallout_out.pptx";

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

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

	// Add chart with default data
	SharedPtr<IChart> chart = slide->get_Shapes()->AddChart(Aspose::Slides::Charts::ChartType::Doughnut, 0, 0, 500, 500);

	int seriesIndex = 0;

	// Setting the index of chart data sheet
	int defaultWorksheetIndex = 0;

	// Getting the chart data worksheet
	SharedPtr<IChartDataWorkbook> fact = chart->get_ChartData()->get_ChartDataWorkbook();


	// Delete default generated series and categories
	chart->get_ChartData()->get_Series()->Clear();
	chart->get_ChartData()->get_Categories()->Clear();
	chart->set_HasLegend(false);
	////////////

	while (seriesIndex < 15)
	{

		SharedPtr<IChartSeries> series = chart->get_ChartData()->get_Series()->Add(fact->GetCell(0, 0, seriesIndex + 1, ObjectExt::Box<System::String>(u"SERIES" + seriesIndex)), chart->get_Type());
		
		series->set_Explosion(0);
		series->get_ParentSeriesGroup()->set_DoughnutHoleSize (20);
		series->get_ParentSeriesGroup()->set_FirstSliceAngle ( 351);
		seriesIndex++;
	}
	int categoryIndex = 0;
	while (categoryIndex < 15)
	{
		chart->get_ChartData()->get_Categories()->Add(fact->GetCell(0, categoryIndex + 1, 0, ObjectExt::Box<System::String>(u"CATEGORY" + categoryIndex)));
		int i = 0;
		while (i < chart->get_ChartData()->get_Series()->get_Count())
		{
			SharedPtr<IChartSeries> iCS = chart->get_ChartData()->get_Series()->idx_get(i);
			SharedPtr<IChartDataPoint> dataPoint = iCS->get_DataPoints()->AddDataPointForDoughnutSeries(fact->GetCell(0, categoryIndex + 1, i + 1, ObjectExt::Box<double>(1)));
			dataPoint->get_Format()->get_Fill()->set_FillType (FillType::Solid);
			dataPoint->get_Format()->get_Line()->get_FillFormat()->set_FillType(FillType::Solid);
			dataPoint->get_Format()->get_Line()->get_FillFormat()->get_SolidFillColor()->set_Color(System::Drawing::Color::get_White());
			dataPoint->get_Format()->get_Line()->set_Width( 1);
			dataPoint->get_Format()->get_Line()->set_Style (LineStyle::Single);
			dataPoint->get_Format()->get_Line()->set_DashStyle(LineDashStyle::Solid);
			if (i == chart->get_ChartData()->get_Series()->get_Count() - 1)
			{
				SharedPtr<IDataLabel> lbl = dataPoint->get_Label();
				lbl->get_TextFormat()->get_TextBlockFormat()->set_AutofitType (TextAutofitType::Shape);
				lbl->get_DataLabelFormat()->get_TextFormat()->get_PortionFormat()->set_FontBold (NullableBool::True);
				lbl->get_DataLabelFormat()->get_TextFormat()->get_PortionFormat()->set_LatinFont(MakeObject<FontData>(u"DINPro-Bold"));

				lbl->get_DataLabelFormat()->get_TextFormat()->get_PortionFormat()->set_FontHeight ( 12);
				lbl->get_DataLabelFormat()->get_TextFormat()->get_PortionFormat()->get_FillFormat()->set_FillType (FillType::Solid);
				lbl->get_DataLabelFormat()->get_TextFormat()->get_PortionFormat()->get_FillFormat()->get_SolidFillColor()->set_Color (System::Drawing::Color::get_LightGray());
				lbl->get_DataLabelFormat()->get_Format()->get_Line()->get_FillFormat()->get_SolidFillColor()->set_Color(System::Drawing::Color::get_White());
				lbl->get_DataLabelFormat()->set_ShowValue ( false);
				lbl->get_DataLabelFormat()->set_ShowCategoryName ( true);
				lbl->get_DataLabelFormat()->set_ShowSeriesName(false);
				//lbl.DataLabelFormat.ShowLabelAsDataCallout = true;
				lbl->get_DataLabelFormat()->set_ShowLeaderLines (true);
				lbl->get_DataLabelFormat()->set_ShowLabelAsDataCallout ( false);
				chart->ValidateChartLayout();
				lbl->set_X((float)lbl->get_X() + (float)0.5);
				lbl->set_Y((float)lbl->get_Y() + (float)0.5);
			}
			i++;
		}
		categoryIndex++;
	}

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