Get Equation Text of Chart Trendline with C++

You can retrieve the Equation Text of Chart Trendline using Aspose.Cells. Aspose.Cells provides Trendline.GetText() property which returns the Equation Text of chart trendline. To make use of this property, you will first have to call Chart.Calculate() method.

The following screenshot shows the Chart with a Trendline and its Equation Text is shown in Red color. We will retrieve this text using the Trendline.GetText() property in the following sample code.

C++ code to get equation text of chart trendline

#include <iostream>
#include "Aspose.Cells.h"

using namespace Aspose::Cells;
using namespace Aspose::Cells::Charts;

int main()
{
    Aspose::Cells::Startup();

    // Source directory path
    U16String srcDir(u"..\\Data\\01_SourceDirectory\\");

    // Create workbook object from source Excel file
    Workbook workbook(srcDir + u"source.xlsx");

    // Access the first worksheet
    Worksheet worksheet = workbook.GetWorksheets().Get(0);

    // Access the first chart inside the worksheet
    Chart chart = worksheet.GetCharts().Get(0);

    // Calculate the Chart first to get the Equation Text of Trendline
    chart.Calculate();

    // Access the Trendline
    Trendline trendLine = chart.GetNSeries().Get(0).GetTrendLines().Get(0);

    // Read the Equation Text of Trendline
    std::cout << "Equation Text: " << trendLine.GetDataLabels().GetText().ToUtf8() << std::endl;

    Aspose::Cells::Cleanup();
}

Output generated by the sample code

This is the console output of the above sample code.

Equation Text: y = 8.1333x + 5