Setting Callout For Data Label in Java Slides

Introduction to Setting Callout for Data Label in Aspose.Slides for Java

In this tutorial, we will demonstrate how to set up callouts for data labels in a chart using Aspose.Slides for Java. Callouts can be useful to highlight specific data points in your chart. We’ll walk through the code step by step and provide the necessary source code.

Prerequisites

You should have Aspose.Slides for Java installed.
Create a Java project and add the Aspose.Slides library to your project.

Step 1: Create a Presentation and Add a Chart

First, we need to create a presentation and add a chart to a slide. Make sure to replace "Your Document Directory" with the actual path to your document directory.

String dataDir = "Your Document Directory";
Presentation pres = new Presentation(dataDir + "testc.pptx");
ISlide slide = pres.getSlides().get_Item(0);
IChart chart = slide.getShapes().addChart(ChartType.Doughnut, 10, 10, 500, 500, false);

Step 2: Configure the Chart

Next, we’ll configure the chart by setting properties such as legend, series, and categories.

IChartDataWorkbook workBook = chart.getChartData().getChartDataWorkbook();
chart.getChartData().getSeries().clear();
chart.getChartData().getCategories().clear();
chart.setLegend(false);

// Configure series and categories (You can adjust the number of series and categories)
int seriesIndex = 0;
while (seriesIndex < 15) {
    IChartSeries series = chart.getChartData().getSeries().add(workBook.getCell(0, 0, seriesIndex + 1, "SERIES " + seriesIndex), chart.getType());
    series.setExplosion(0);
    series.getParentSeriesGroup().setDoughnutHoleSize((byte) 20);
    series.getParentSeriesGroup().setFirstSliceAngle(351);
    seriesIndex++;
}

int categoryIndex = 0;
while (categoryIndex < 15) {
    chart.getChartData().getCategories().add(workBook.getCell(0, categoryIndex + 1, 0, "CATEGORY " + categoryIndex));
    int i = 0;
    while (i < chart.getChartData().getSeries().size()) {
        // Add data points here
        // ...
        i++;
    }
    categoryIndex++;
}

Step 3: Customize Data Labels

Now, we’ll customize the data labels, including setting up callouts for the last series.

int i = 0;
while (i < chart.getChartData().getSeries().size()) {
    IChartSeries iCS = chart.getChartData().getSeries().get_Item(i);
    IChartDataPoint dataPoint = iCS.getDataPoints().addDataPointForDoughnutSeries(workBook.getCell(0, categoryIndex + 1, i + 1, 1));
    dataPoint.getFormat().getFill().setFillType(FillType.Solid);
    // Customize data point formatting (Fill, Line, etc.)

    if (i == chart.getChartData().getSeries().size() - 1) {
        IDataLabel lbl = dataPoint.getLabel();
        lbl.getTextFormat().getTextBlockFormat().setAutofitType(TextAutofitType.Shape);
        // Customize label formatting (Font, Fill, etc.)
        lbl.getDataLabelFormat().setShowValue(false);
        lbl.getDataLabelFormat().setShowCategoryName(true);
        lbl.getDataLabelFormat().setShowSeriesName(false);
        // Enable callouts
        lbl.getDataLabelFormat().setShowLabelAsDataCallout(true);
        lbl.getDataLabelFormat().setShowLeaderLines(true);
    }
    i++;
}

Step 4: Save the Presentation

Finally, save the presentation with the configured chart.

pres.save("chart.pptx", SaveFormat.Pptx);

Now, you have successfully set up callouts for data labels in a chart using Aspose.Slides for Java. Customize the code according to your specific chart and data requirements.

Complete Source Code For Setting Callout For Data Label in Java Slides

String dataDir = "Your Document Directory";
Presentation pres = new Presentation(dataDir + "testc.pptx");
ISlide slide = pres.getSlides().get_Item(0);
IChart chart = slide.getShapes().addChart(ChartType.Doughnut, 10, 10, 500, 500, false);
IChartDataWorkbook workBook = chart.getChartData().getChartDataWorkbook();
chart.getChartData().getSeries().clear();
chart.getChartData().getCategories().clear();
chart.setLegend(false);
int seriesIndex = 0;
while (seriesIndex < 15)
{
	IChartSeries series = chart.getChartData().getSeries().add(workBook.getCell(0, 0, seriesIndex + 1, "SERIES " + seriesIndex), chart.getType());
	series.setExplosion(0);
	series.getParentSeriesGroup().setDoughnutHoleSize((byte) 20);
	series.getParentSeriesGroup().setFirstSliceAngle(351);
	seriesIndex++;
}
int categoryIndex = 0;
while (categoryIndex < 15)
{
	chart.getChartData().getCategories().add(workBook.getCell(0, categoryIndex + 1, 0, "CATEGORY " + categoryIndex));
	int i = 0;
	while (i < chart.getChartData().getSeries().size())
	{
		IChartSeries iCS = chart.getChartData().getSeries().get_Item(i);
		IChartDataPoint dataPoint = iCS.getDataPoints().addDataPointForDoughnutSeries(workBook.getCell(0, categoryIndex + 1, i + 1, 1));
		dataPoint.getFormat().getFill().setFillType(FillType.Solid);
		dataPoint.getFormat().getLine().getFillFormat().setFillType(FillType.Solid);
		dataPoint.getFormat().getLine().getFillFormat().getSolidFillColor().setColor(Color.WHITE);
		dataPoint.getFormat().getLine().setWidth(1);
		dataPoint.getFormat().getLine().setStyle(LineStyle.Single);
		dataPoint.getFormat().getLine().setDashStyle(LineDashStyle.Solid);
		if (i == chart.getChartData().getSeries().size() - 1)
		{
			IDataLabel lbl = dataPoint.getLabel();
			lbl.getTextFormat().getTextBlockFormat().setAutofitType(TextAutofitType.Shape);
			lbl.getDataLabelFormat().getTextFormat().getPortionFormat().setFontBold(NullableBool.True);
			lbl.getDataLabelFormat().getTextFormat().getPortionFormat().setLatinFont(new FontData("DINPro-Bold"));
			lbl.getDataLabelFormat().getTextFormat().getPortionFormat().setFontHeight(12);
			lbl.getDataLabelFormat().getTextFormat().getPortionFormat().getFillFormat().setFillType(FillType.Solid);
			lbl.getDataLabelFormat().getTextFormat().getPortionFormat().getFillFormat().getSolidFillColor().setColor(Color.LIGHT_GRAY);
			lbl.getDataLabelFormat().getFormat().getLine().getFillFormat().getSolidFillColor().setColor(Color.WHITE);
			lbl.getDataLabelFormat().setShowValue(false);
			lbl.getDataLabelFormat().setShowCategoryName(true);
			lbl.getDataLabelFormat().setShowSeriesName(false);
			//lbl.getDataLabelFormat().setShowLabelAsDataCallout(true);
			lbl.getDataLabelFormat().setShowLeaderLines(true);
			lbl.getDataLabelFormat().setShowLabelAsDataCallout(false);
			chart.validateChartLayout();
			lbl.setX(lbl.getX() + (float) 0.5);
			lbl.setY(lbl.getY() + (float) 0.5);
		}
		i++;
	}
	categoryIndex++;
}
pres.save("chart.pptx", SaveFormat.Pptx);

Conclusion

In this tutorial, we have explored how to set up callouts for data labels in a chart using Aspose.Slides for Java. Callouts are valuable tools for emphasizing specific data points in your charts and presentations. We’ve provided a step-by-step guide along with source code to help you achieve this customization.

FAQ’s

How do I customize the appearance of data labels?

To customize the appearance of data labels, you can modify properties such as font, fill, and line styles. For example:

IDataLabel lbl = dataPoint.getLabel();
lbl.getTextFormat().getTextBlockFormat().setAutofitType(TextAutofitType.Shape);
lbl.getDataLabelFormat().getTextFormat().getPortionFormat().setFontBold(NullableBool.True);
lbl.getDataLabelFormat().getTextFormat().getPortionFormat().setLatinFont(new FontData("DINPro-Bold"));
lbl.getDataLabelFormat().getTextFormat().getPortionFormat().setFontHeight(12);
lbl.getDataLabelFormat().getTextFormat().getPortionFormat().getFillFormat().setFillType(FillType.Solid);
lbl.getDataLabelFormat().getTextFormat().getPortionFormat().getFillFormat().getSolidFillColor().setColor(Color.LIGHT_GRAY);
lbl.getDataLabelFormat().getFormat().getLine().getFillFormat().getSolidFillColor().setColor(Color.WHITE);

How can I enable or disable callouts for data labels?

To enable or disable callouts for data labels, use the setShowLabelAsDataCallout method. Set it to true to enable callouts and false to disable them.

lbl.getDataLabelFormat().setShowLabelAsDataCallout(true); // Enable callouts
lbl.getDataLabelFormat().setShowLabelAsDataCallout(false); // Disable callouts

Can I customize the leader lines for data labels?

Yes, you can customize the leader lines for data labels using properties like line style, color, and width. For example:

lbl.getDataLabelFormat().setShowLeaderLines(true); // Enable leader lines
lbl.getDataLabelFormat().getLeaderLinesFormat().getFormat().getLine().setStyle(LineStyle.Single);
lbl.getDataLabelFormat().getLeaderLinesFormat().getFormat().getLine().setWidth(1);
lbl.getDataLabelFormat().getLeaderLinesFormat().getFormat().getLine().getFillFormat().setFillType(FillType.Solid);
lbl.getDataLabelFormat().getLeaderLinesFormat().getFormat().getLine().getFillFormat().getSolidFillColor().setColor(Color.BLACK);

These are some common customization options for data labels and callouts in Aspose.Slides for Java. You can further tailor the appearance to your specific needs.

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