Error Bar

Add Error Bar

Aspose.Slides for Node.js via Java provides a simple API for managing error bar values. The sample code applies when using a custom value type. To specify a value, use the ErrorBarCustomValues property of a specific data point in the DataPoints collection of series:

1. Create an instance of the Presentation class.
2. Add a bubble chart on desired slide.
3. Access the first chart series and set the error bar X format.
4. Access the first chart series and set the error bar Y format.
5. Setting bars values and format.
6. Write the modified presentation to a PPTX file.

// Create an instance of Presentation class
var pres = new aspose.slides.Presentation();
try {
    // Creating a bubble chart
    var chart = pres.getSlides().get_Item(0).getShapes().addChart(aspose.slides.ChartType.Bubble, 50, 50, 400, 300, true);
    // Adding Error bars and setting its format
    var errBarX = chart.getChartData().getSeries().get_Item(0).getErrorBarsXFormat();
    var errBarY = chart.getChartData().getSeries().get_Item(0).getErrorBarsYFormat();
    errBarX.isVisible();
    errBarY.isVisible();
    errBarX.setValueType(aspose.slides.ErrorBarValueType.Fixed);
    errBarX.setValue(0.1);
    errBarY.setValueType(aspose.slides.ErrorBarValueType.Percentage);
    errBarY.setValue(5);
    errBarX.setType(aspose.slides.ErrorBarType.Plus);
    errBarY.getFormat().getLine().setWidth(2.0);
    errBarX.hasEndCap();
    // Saving presentation
    pres.save("ErrorBars.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    if (pres != null) {
        pres.dispose();
    }
}

Add Custom Error Bar Value

Aspose.Slides for Node.js via Java provides a simple API for managing custom error bar values. The sample code applies when the ErrorBarsFormat.ValueType property is equal to Custom. To specify a value, use the ErrorBarCustomValues property of a specific data point in the DataPoints collection of series:

1. Create an instance of the Presentation class.
2. Add a bubble chart on desired slide.
3. Access the first chart series and set the error bar X format.
4. Access the first chart series and set the error bar Y format.
5. Access the chart series individual data points and setting the Error Bar values for individual series data point.
6. Setting bars values and format.
7. Write the modified presentation to a PPTX file.

// Create an instance of Presentation class
var pres = new aspose.slides.Presentation();
try {
    // Creating a bubble chart
    var chart = pres.getSlides().get_Item(0).getShapes().addChart(aspose.slides.ChartType.Bubble, 50, 50, 400, 300, true);
    // Adding custom Error bars and setting its format
    var series = chart.getChartData().getSeries().get_Item(0);
    var errBarX = series.getErrorBarsXFormat();
    var errBarY = series.getErrorBarsYFormat();
    errBarX.isVisible();
    errBarY.isVisible();
    errBarX.setValueType(aspose.slides.ErrorBarValueType.Custom);
    errBarY.setValueType(aspose.slides.ErrorBarValueType.Custom);
    // Accessing chart series data point and setting error bars values for
    // individual point
    var points = series.getDataPoints();
    points.getDataSourceTypeForErrorBarsCustomValues().setDataSourceTypeForXPlusValues(aspose.slides.DataSourceType.DoubleLiterals);
    points.getDataSourceTypeForErrorBarsCustomValues().setDataSourceTypeForXMinusValues(aspose.slides.DataSourceType.DoubleLiterals);
    points.getDataSourceTypeForErrorBarsCustomValues().setDataSourceTypeForYPlusValues(aspose.slides.DataSourceType.DoubleLiterals);
    points.getDataSourceTypeForErrorBarsCustomValues().setDataSourceTypeForYMinusValues(aspose.slides.DataSourceType.DoubleLiterals);
    // Setting error bars for chart series points
    for (var i = 0; i < points.size(); i++) {
        points.get_Item(i).getErrorBarsCustomValues().getXMinus().setAsLiteralDouble(i + 1);
        points.get_Item(i).getErrorBarsCustomValues().getXPlus().setAsLiteralDouble(i + 1);
        points.get_Item(i).getErrorBarsCustomValues().getYMinus().setAsLiteralDouble(i + 1);
        points.get_Item(i).getErrorBarsCustomValues().getYPlus().setAsLiteralDouble(i + 1);
    }
    // Saving presentation
    pres.save("ErrorBarsCustomValues.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    if (pres != null) {
        pres.dispose();
    }
}