如何更改jfreechart XYPlot中的標記大小

Question

在此問題的選定答案中，我想更改標記大小，我該怎麼做？

Setting Range for X,Y Axis-JfreeChart

Answer 1

您可以通過XYItemRenderer.setSeriesShape實現這一目標。請參考DefaultDrawingSupplier .createStandardSeriesShapes()的工作原理。

XYItemRenderer renderer = xyPlot.getRenderer(); 
    renderer.setSeriesPaint(0, Color.blue); 
    double size = 20.0; 
    double delta = size/2.0; 
    Shape shape1 = new Rectangle2D.Double(-delta, -delta, size, size); 
    Shape shape2 = new Ellipse2D.Double(-delta, -delta, size, size); 
    renderer.setSeriesShape(0, shape1); 
    renderer.setSeriesShape(1, shape2); 

參考：JFreeChart: Increase Size of Data Point