Chart Data Marker

Set Chart Marker Options

The markers can be set on chart data points inside 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 first chart series.
  • Add new data point.
  • Write presentation to disk.

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

// Create an instance of Presentation class
using Presentation presentation = new Presentation();

ISlide slide = presentation.Slides[0];

// Creating the default chart
IChart chart = slide.Shapes.AddChart(ChartType.LineWithMarkers, 0, 0, 400, 400);

// Getting the default chart data worksheet index
int defaultWorksheetIndex = 0;

// Getting the chart data worksheet
IChartDataWorkbook fact = chart.ChartData.ChartDataWorkbook;

// Delete demo series
chart.ChartData.Series.Clear();

// Add new series
chart.ChartData.Series.Add(fact.GetCell(defaultWorksheetIndex, 1, 1, "Series 1"), chart.Type);

// Set the picture
using IImage image1 = Images.FromFile("aspose-logo.jpg");
IPPImage imgx1 = presentation.Images.AddImage(image1);

// Set the picture
using IImage image2 = Images.FromFile("Tulips.jpg");
IPPImage imgx2 = presentation.Images.AddImage(image2);

// Take first chart series
IChartSeries series = chart.ChartData.Series[0];

// Add new point (1:3) there.
IChartDataPoint point = series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 1, 1, (double)4.5));
point.Marker.Format.Fill.FillType = FillType.Picture;
point.Marker.Format.Fill.PictureFillFormat.Picture.Image = imgx1;

point = series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 2, 1, (double)2.5));
point.Marker.Format.Fill.FillType = FillType.Picture;
point.Marker.Format.Fill.PictureFillFormat.Picture.Image = imgx2;

point = series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 3, 1, (double)3.5));
point.Marker.Format.Fill.FillType = FillType.Picture;
point.Marker.Format.Fill.PictureFillFormat.Picture.Image = imgx1;

point = series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 4, 1, (double)4.5));
point.Marker.Format.Fill.FillType = FillType.Picture;
point.Marker.Format.Fill.PictureFillFormat.Picture.Image = imgx2;

// Changing the chart series marker
series.Marker.Size = 15;

// Write presentation to disk
presentation.Save("MarkOptions_out.pptx", SaveFormat.Pptx);