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Is it possible to achieve transparent background in pie chart?

See original GitHub issue

Hello. I’ve been trying to generate a piechart as an asset to my pdf template.

I need it to be png with transparent background but I’m only getting black solid colour instead. image

Maybe I’m missing some property or doing something wrong with my colour settings.


Here is my code :

PieChart chart = new PieChartBuilder()


        Color[] sliceColors = new Color[] {
                new Color(238, 88, 88), //red
                new Color(213, 122, 212), //purple
                new Color(106,230, 182), //mentol
                new Color(88,155,238) //baby blue

                new Color(255,255, 255, 0)
                new Color(255,255, 255, 0)

        chart.addSeries("laptop", 65);
        chart.addSeries("pc", 10);
        chart.addSeries("tel", 12.5);
        chart.addSeries("winda", 12.5);

        BitmapEncoder.saveBitmap(chart, "./Sample_Chart", BitmapEncoder.BitmapFormat.PNG);

Issue Analytics

  • State:closed
  • Created 3 years ago
  • Comments:12 (4 by maintainers)

github_iconTop GitHub Comments

timmoltercommented, Jul 21, 2020

I thought that the default background had an alpha of 1, which would mean necessitating manually setting to background alpha to 0 to get the desired transparency. If it’s now exporting with no transparency, then that would also be a bug in my opinion. In fact that might be why I set the type to TYPE_INT_RGB originally in:

new BufferedImage(chart.getWidth(), chart.getHeight(), BufferedImage.TYPE_INT_ARGB);
Mr14huashaocommented, Jul 21, 2020

@staho @timmolter The code is updated. After the test, the background of the exported image is not black. You do not need to set alpha. This is not a color transparency issue, but a background issue for generating images.

    chart.getStyler().setChartBackgroundColor(new Color(255, 255, 255));
    chart.getStyler().setPlotBackgroundColor(new Color(255, 255, 255));
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