draw a custom shape chart with colour and log scale

[plunavat]

Hello,

How we can draw the attached chart using jfreechart. i have the XY Points of the curve.
1. The shape would be painted
2. it would be on log scale



any direction would be of great help.
Regards,
Pranav C Lunavat

[plunavat]

i am attaching a sample dataset for one shape

Code: Select all

 private static XYDataset createDataset() {
        XYSeriesCollection dataset = new XYSeriesCollection();
       
        XYSeries series = new XYSeries("Random Data", false);
        XYSeries series1 = new XYSeries("Random Data1", false);
        XYSeries series2 = new XYSeries("Random Data2", false);
        XYSeries series3 = new XYSeries("Random Data3", false);
        
     // data for Upper Curve
      
        series.add(38.85,34);
        series.add(55.5,30.5);
        series.add(60,28.8);

  // data for lower Curve
        series1.add(33.6,19.2);
        series1.add(48,17);
        series1.add(55,15.4);

  // data to join first point of both curve       
       
       series2.add(38.85,34);
       series2.add(33.6,19.2);

  // data to join last point of both curve
       
       series3.add(60,28.8);
       series3.add(55,15.4);
      
       
       dataset.addSeries(series);
       dataset.addSeries(series1);
       dataset.addSeries(series2);
       dataset.addSeries(series3);
       return dataset;
    }

this creates the shape, but i am unable to fill the shape.


Also is this the correct way.. or is there any alternate and better option

Regards,
Pranav C Lunavat

[paradoxoff]

In the screenshot, the lines connecting the data points are apparently slightly curved, so I assume that you have used an XYSplineRenderer.
Unfortunately, this renderer and its "parent" renderer the XYLineAndShapeRenderer only draw the path which is generated from the individual line or curve segments.
After studying the source codes for a while, I suggest to do the following:
Extend XYSplineRenderer, add a field "pathFillPaint" which is an instance of Paint, and override the method drawFirstPassShape(java.awt.Graphics2D g2, int pass, int series, int item, java.awt.Shape shape).In the overriden method, place the following code

Code: Select all

super.drawFirstPassShape(java.awt.Graphics2D g2, int pass, int series, int item, java.awt.Shape shape);
g2.setPaint(pathFillPaint);
g2.fill(shape);

You will also have to stuff your data points into a single series for this to work.
[Edit] just tried that with the code snippet provided here. Apparently, that approach does not work because the interpolation used in the XYSplineRenderer leads to a very deformed shape. But you should be able to get a shape with straight lines using a precision of 1.