# Manage Chart Data Markers in Presentations Using C++

> Learn how to customize chart data markers in Aspose.Slides for C++, boosting presentation impact across PPT and PPTX formats with clear C++ code examples.

Source: https://docs.aspose.com/slides/cpp/chart-data-marker/
Updated: 2026-08-02


## **Overview**

This article explains how to work with chart data markers in Aspose.Slides. It shows how to create a chart, access a series and its data points, apply picture fills to markers at the data-point level, adjust marker size, and save the updated presentation. It also notes that standard marker shapes are available through the `MarkerStyleType` enumeration and that marker appearance is preserved when exporting charts to raster formats or SVG.

## **Set Chart Markers**
Aspose.Slides for C++ provides a simple API to set the chart series marker automatically. In the following feature, every chart series will get different default marker symbol automatically.

Below code example shows how to set the chart series marker automatically.

{{< gist "aspose-com-gists" "81aeb05e6d3a070aa76fdea22ed53bc7" "Examples-SlidesCPP-DefaultMarkersInChart-DefaultMarkersInChart.cpp" >}}


## **Set Chart Marker Options**
The markers can be set on chart data points inside a particular series. In order to set chart marker options. Please follow the steps below:

- Instantiate [Presentation](https://reference.aspose.com/slides/cpp/aspose.slides/presentation/) class.
- Creating the default chart.
- Set the picture.
- Take the first chart series.
- Add a new data point.
- Write a presentation to disk.

In the example given below, we have set the chart marker options on data points level.

{{< gist "aspose-slides" "a690df625dc0b1fff869ab198affe7a4" "Examples-SlidesCPP-SetMarkerOptions-SetMarkerOptions.cpp" >}}


## **Set Chart Markers on the Series Data Point Level**
Now, the markers can be set on chart data points inside a particular series. In order to set chart marker options. Please follow the steps below:

- Instantiate Presentation class.
- Creating the default chart.
- Set the picture.
- Take the first chart series.
- Add a new data point.
- Write a presentation to disk.

In the example given below, we have set the chart marker options on data points level.

```cpp
const String outPath = u"../out/SetMarkerOptionsonSeries_out.pptx";
const String ImagePath = u"../templates/Tulips.jpg";
const String ImagePath2 = u"../templates/aspose - logo.jpg";

//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::LineWithMarkers, 0, 0, 500, 500);

// 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();

// Now, Adding a new series
SharedPtr<IChartSeries> series = chart->get_ChartData()->get_Series()->Add(fact->GetCell(defaultWorksheetIndex, 1, 1, ObjectExt::Box<System::String>(u"Series 1")), chart->get_Type());

// Get the picture
SharedPtr<IImage> image = Images::FromFile(ImagePath);
SharedPtr<IImage> image2 = Images::FromFile(ImagePath2);

// Add image to presentation's images collection
SharedPtr<IPPImage> imgx1 = pres->get_Images()->AddImage(image);
SharedPtr<IPPImage> imgx2 = pres->get_Images()->AddImage(image2);

image->Dispose();
image2->Dispose();

// Add new point (1:3) there.
SharedPtr<IChartDataPoint> point = series->get_DataPoints()->AddDataPointForLineSeries(fact->GetCell(defaultWorksheetIndex, 1, 1, ObjectExt::Box<double>(4.5)));
point->get_Marker()->get_Format()->get_Fill()->set_FillType(FillType::Picture);
point->get_Marker()->get_Format()->get_Fill()->get_PictureFillFormat()->get_Picture()->set_Image(imgx1);

point = series->get_DataPoints()->AddDataPointForLineSeries(fact->GetCell(defaultWorksheetIndex, 2, 1, ObjectExt::Box<double>(2.5)));
point->get_Marker()->get_Format()->get_Fill()->set_FillType(FillType::Picture);
point->get_Marker()->get_Format()->get_Fill()->get_PictureFillFormat()->get_Picture()->set_Image(imgx2);

point = series->get_DataPoints()->AddDataPointForLineSeries(fact->GetCell(defaultWorksheetIndex, 3, 1, ObjectExt::Box<double>(3.5)));
point->get_Marker()->get_Format()->get_Fill()->set_FillType(FillType::Picture);
point->get_Marker()->get_Format()->get_Fill()->get_PictureFillFormat()->get_Picture()->set_Image(imgx1);

point = series->get_DataPoints()->AddDataPointForLineSeries(fact->GetCell(defaultWorksheetIndex, 4, 1, ObjectExt::Box<double>(4.5)));
point->get_Marker()->get_Format()->get_Fill()->set_FillType(FillType::Picture);
point->get_Marker()->get_Format()->get_Fill()->get_PictureFillFormat()->get_Picture()->set_Image(imgx2);

// Changing the chart series marker
series->get_Marker()->set_Size(15);

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

## **Apply a Color to Data Points**
You can apply color to data points in the chart using Aspose.Slides for C++. [**IChartDataPointLevelsManager**](https://reference.aspose.com/slides/cpp/aspose.slides.charts/ichartdatapointlevelsmanager/) and **[IChartDataPointLevel](https://reference.aspose.com/slides/cpp/aspose.slides.charts/ichartdatapointlevel/)** classes have been added to get access to properties of data point levels. This article demonstrates how you can access and apply color to data points in a chart.

{{< gist "aspose-com-gists" "81aeb05e6d3a070aa76fdea22ed53bc7" "Examples-SlidesCPP-AddColorToDataPoints-AddColorToDataPoints.cpp" >}}

## **FAQ**

### Which marker shapes are available out of the box?

Standard shapes are available (circle, square, diamond, triangle, etc.); the list is defined by the [MarkerStyleType](https://reference.aspose.com/slides/cpp/aspose.slides.charts/markerstyletype/) enumeration. If you need a non-standard shape, use a marker with a picture fill to emulate custom visuals.

### Are markers preserved when exporting a chart to an image or SVG?

Yes. When rendering charts to [raster formats](/slides/cpp/convert-powerpoint-to-png/) or saving [shapes as SVG](/slides/cpp/render-a-slide-as-an-svg-image/), markers retain their appearance and settings, including size, fill, and outline.