Error Bar

Add Error Bar

Aspose.Slides for 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
Presentation pres = new Presentation();
try {
    // Creating a bubble chart
    IChart chart = pres.getSlides().get_Item(0).getShapes().addChart(ChartType.Bubble, 50, 50, 400, 300, true);

    // Adding Error bars and setting its format
    IErrorBarsFormat errBarX = chart.getChartData().getSeries().get_Item(0).getErrorBarsXFormat();
    IErrorBarsFormat errBarY = chart.getChartData().getSeries().get_Item(0).getErrorBarsYFormat();

    errBarX.isVisible();
    errBarY.isVisible();
    errBarX.setValueType((byte) ErrorBarValueType.Fixed);
    errBarX.setValue(0.1f);
    errBarY.setValueType((byte) ErrorBarValueType.Percentage);
    errBarY.setValue(5);
    errBarX.setType((byte) ErrorBarType.Plus);
    errBarY.getFormat().getLine().setWidth(2.0f);
    errBarX.hasEndCap();

    // Saving presentation
    pres.save("ErrorBars.pptx", SaveFormat.Pptx);
} finally {
    if (pres != null) pres.dispose();
}

Add Custom Error Bar Value

Aspose.Slides for Java provides a simple API for managing custom error bar values. The sample code applies when the IErrorBarsFormat.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
Presentation pres = new Presentation();
try {
    // Creating a bubble chart
    IChart chart = pres.getSlides().get_Item(0).getShapes().addChart(ChartType.Bubble, 50, 50, 400, 300, true);

    // Adding custom Error bars and setting its format
    IChartSeries series = chart.getChartData().getSeries().get_Item(0);
    IErrorBarsFormat errBarX = series.getErrorBarsXFormat();
    IErrorBarsFormat errBarY = series.getErrorBarsYFormat();
    errBarX.isVisible();
    errBarY.isVisible();
    errBarX.setValueType((byte) ErrorBarValueType.Custom);
    errBarY.setValueType((byte) ErrorBarValueType.Custom);

    // Accessing chart series data point and setting error bars values for
    // individual point
    IChartDataPointCollection points = series.getDataPoints();
    points.getDataSourceTypeForErrorBarsCustomValues().setDataSourceTypeForXPlusValues((byte) DataSourceType.DoubleLiterals);
    points.getDataSourceTypeForErrorBarsCustomValues().setDataSourceTypeForXMinusValues((byte) DataSourceType.DoubleLiterals);
    points.getDataSourceTypeForErrorBarsCustomValues().setDataSourceTypeForYPlusValues((byte) DataSourceType.DoubleLiterals);
    points.getDataSourceTypeForErrorBarsCustomValues().setDataSourceTypeForYMinusValues((byte) DataSourceType.DoubleLiterals);

    // Setting error bars for chart series points
    for (int 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", SaveFormat.Pptx);
} finally {
    if (pres != null) pres.dispose();
}