Manage Callouts in Presentation Charts Using JavaScript

Using Callouts

New methods getShowLabelAsDataCallout() and setShowLabelAsDataCallout() have been added to DataLabelFormat class and DataLabelFormat class. These methods determine either specified chart’s data label will be displayed as data callout or as data label.

var pres = new aspose.slides.Presentation();
try {
    var chart = pres.getSlides().get_Item(0).getShapes().addChart(aspose.slides.ChartType.Pie, 50, 50, 500, 400);
    chart.getChartData().getSeries().get_Item(0).getLabels().getDefaultDataLabelFormat().setShowValue(true);
    chart.getChartData().getSeries().get_Item(0).getLabels().getDefaultDataLabelFormat().setShowLabelAsDataCallout(true);
    chart.getChartData().getSeries().get_Item(0).getLabels().get_Item(2).getDataLabelFormat().setShowLabelAsDataCallout(false);
    pres.save("DisplayCharts.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    if (pres != null) {
        pres.dispose();
    }
}

Set Callout for Doughnut Chart

Aspose.Slides for Node.js via Java provides support for setting series data label callout shape for a Doughnut chart. Below sample example is given. 

var pres = new aspose.slides.Presentation();
try {
    var slide = pres.getSlides().get_Item(0);
    var chart = slide.getShapes().addChart(aspose.slides.ChartType.Doughnut, 10, 10, 500, 500, false);
    var workBook = chart.getChartData().getChartDataWorkbook();
    chart.getChartData().getSeries().clear();
    chart.getChartData().getCategories().clear();
    chart.setLegend(false);
    var seriesIndex = 0;
    while (seriesIndex < 15) {
        var series = chart.getChartData().getSeries().add(workBook.getCell(0, 0, seriesIndex + 1, "SERIES " + seriesIndex), chart.getType());
        series.setExplosion(0);
        series.getParentSeriesGroup().setDoughnutHoleSize(20);
        series.getParentSeriesGroup().setFirstSliceAngle(351);
        seriesIndex++;
    }
    var categoryIndex = 0;
    while (categoryIndex < 15) {
        chart.getChartData().getCategories().add(workBook.getCell(0, categoryIndex + 1, 0, "CATEGORY " + categoryIndex));
        var i = 0;
        while (i < chart.getChartData().getSeries().size()) {
            var iCS = chart.getChartData().getSeries().get_Item(i);
            var dataPoint = iCS.getDataPoints().addDataPointForDoughnutSeries(workBook.getCell(0, categoryIndex + 1, i + 1, 1));
            dataPoint.getFormat().getFill().setFillType(java.newByte(aspose.slides.FillType.Solid));
            dataPoint.getFormat().getLine().getFillFormat().setFillType(java.newByte(aspose.slides.FillType.Solid));
            dataPoint.getFormat().getLine().getFillFormat().getSolidFillColor().setColor(java.getStaticFieldValue("java.awt.Color", "WHITE"));
            dataPoint.getFormat().getLine().setWidth(1);
            dataPoint.getFormat().getLine().setStyle(aspose.slides.LineStyle.Single);
            dataPoint.getFormat().getLine().setDashStyle(aspose.slides.LineDashStyle.Solid);
            if (i == (chart.getChartData().getSeries().size() - 1)) {
                var lbl = dataPoint.getLabel();
                lbl.getTextFormat().getTextBlockFormat().setAutofitType(aspose.slides.TextAutofitType.Shape);
                lbl.getDataLabelFormat().getTextFormat().getPortionFormat().setFontBold(aspose.slides.NullableBool.True);
                lbl.getDataLabelFormat().getTextFormat().getPortionFormat().setLatinFont(new aspose.slides.FontData("DINPro-Bold"));
                lbl.getDataLabelFormat().getTextFormat().getPortionFormat().setFontHeight(12);
                lbl.getDataLabelFormat().getTextFormat().getPortionFormat().getFillFormat().setFillType(java.newByte(aspose.slides.FillType.Solid));
                lbl.getDataLabelFormat().getTextFormat().getPortionFormat().getFillFormat().getSolidFillColor().setColor(java.getStaticFieldValue("java.awt.Color", "LIGHT_GRAY"));
                lbl.getDataLabelFormat().getFormat().getLine().getFillFormat().getSolidFillColor().setColor(java.getStaticFieldValue("java.awt.Color", "WHITE"));
                lbl.getDataLabelFormat().setShowValue(false);
                lbl.getDataLabelFormat().setShowCategoryName(true);
                lbl.getDataLabelFormat().setShowSeriesName(false);
                lbl.getDataLabelFormat().setShowLeaderLines(true);
                lbl.getDataLabelFormat().setShowLabelAsDataCallout(false);
                chart.validateChartLayout();
                lbl.setX(lbl.getX() + 0.5);
                lbl.setY(lbl.getY() + 0.5);
            }
            i++;
        }
        categoryIndex++;
    }
    pres.save("chart.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    if (pres != null) {
        pres.dispose();
    }
}

FAQ

Are callouts preserved when converting a presentation to PDF, HTML5, SVG, or images?

Yes. Callouts are part of the chart rendering, so when you export to PDF, HTML5, SVG, or raster images, they are preserved together with the slide’s formatting.

Do custom fonts work in callouts, and can their appearance be preserved on export?

Yes. Aspose.Slides supports embedding fonts into the presentation and controls font embedding during exports such as PDF, ensuring the callouts look the same across different systems.