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Thanks a lot, Weihang. I've used your class and works perfectly. I have remade your example in order to make easier to use it. Just copy the class XYSmoothLineAndShapeRenderer and once you have the XYPlot, use the code: XYPlot xyplot = jfreechart.getXYPlot(); . . . . xyplot.setRenderer(new XYSmoothL...

I tink that is fou have 200 points in a 400 pixel chart you don't need to smooth the line! If you do, the bezier curves are about a few pixels long, so make this strange effect. Another thing is the way you calculate the control points. I've posted the class I use, that makes a new dataset instead o...

I've seen that many people asks for a method to draw smooth lines. I've done a class that converts the datasets to datasets following bezier lines between the given points. It's like the method used in PEAR Image_Graph in PHP. The class is the following: import java.awt.geom.*; import org.jfree.data...