How to change shape of square to dot in XYSplineRenderer Graph

Question

In JFreeChart XYSplineRenderer Graph I need to display small dots instead of small squares to display XY coordinates. How can I change the shape of these dots?

Answer 1

To center a symmetric Shape over a given data point, you'll want to offset the top-left corner by the radius (half the diameter). For smaller dots,

setSeriesShape(0, new Ellipse2D.Double(-3, -3, 6, 6));

See also this related example using ShapeUtilities.

Answer 2

Use the setBaseShape method inherited from AbstractRenderer. Or you can use setSeriesShape

setBaseShape(new Ellipse2D.Float(100.0f, 100.0f, 100.0f, 100.0f));