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javajfreechart

Apply image/pattern to pie section instead of normal color

Instead of using normal plot.setSectionPaint() method to fill color of the pie section, is it possible to add a pattern or a image as shown below.

I have got this requirement as the colors are difficult to distinguish when printed in black & white printer.

Worst case if not possible then I will have to use 2 very different colors which are easily distinguishable over b/w printer

pie chart

Solution

  • setSectionPaint allows any implementation of the interface java.awt.Paint to be passed. Color is one class that implements Paint, but there are others, such as TexturePaint.

    This code will create a TexturePaint like the blue line pattern in your example:

    BufferedImage texture = new BufferedImage(1, 30, BufferedImage.TYPE_INT_RGB);
Graphics2D g = texture.createGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, 1, 30);
g.setColor(new Color(0x26A2D6));
g.fillRect(0, 0, 1, 20);
g.dispose();

TexturePaint texturePaint = new TexturePaint(texture,
    texture.getRaster().getBounds());

    You can then pass that texturePaint as the argument to setSectionPaint.