Exporting OpenXML based Charts into images

Question

Can I generate image from office OpenXml based chart definition? My idea is to use the program dynamically generate OpenXml definition of a chart and export it as image.

Answer 1

Aspose.Cells can

• Generate the OpenXML or XLSX Charts,
• Manipulate the existing Charts and
• Export them into Image

Exporting Chart to Image is very simple. Just call Chart.ToImage() method and you have accomplished it.

The following sample code creates the Chart and saves the Excel file in XLSX format.

// Instantiating a Workbook object
Workbook workbook = new Workbook();

// Adding a new worksheet to the Excel object
int sheetIndex = workbook.Worksheets.Add();

// Obtaining the reference of the newly added worksheet by passing its sheet index
Worksheet worksheet = workbook.Worksheets[sheetIndex];

// Adding sample values to cells
worksheet.Cells["A1"].PutValue(50);
worksheet.Cells["A2"].PutValue(100);
worksheet.Cells["A3"].PutValue(150);
worksheet.Cells["B1"].PutValue(4);
worksheet.Cells["B2"].PutValue(20);
worksheet.Cells["B3"].PutValue(50);

// Adding a chart to the worksheet
int chartIndex = worksheet.Charts.Add(Aspose.Cells.Charts.ChartType.Pyramid, 5, 0, 15, 5);

// Accessing the instance of the newly added chart
Aspose.Cells.Charts.Chart chart = worksheet.Charts[chartIndex];

// Adding SeriesCollection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.NSeries.Add("A1:B3", true);

// Saving the Excel file
workbook.Save(dataDir + "output.xlsx");

The following sample code exports the Chart into Image.

// Converting chart to Bitmap
System.Drawing.Bitmap bitmap = chart.ToImage();
bitmap.Save(dataDir + "chartBMP_out.bmp", System.Drawing.Imaging.ImageFormat.Bmp);

Note: I am working as Developer Evangelist at Aspose