getChartRenderingInformation() getScreenDataArea() both null

[mechko]

Hej,

I'm trying to convert Java2D-Coordinates from a ChartMouseEvent to the coordinates of my XYPlot. I know that I have to use java2DToValue(). But the required Rectangel2D returned by ChartPanel.getScreenDataArea() returns always only zero-values.

JFreeChart chart = e.createChart();
ChartPanel cp = new ChartPanel(chart);
System.out.println(cp.getScreenDataArea().toString())

--> java.awt.geom.Rectangle2D$Double[x=0.0,y=0.0,w=0.0,h=0.0]

When I try to use the return value of getPlotArea() from getChartRenderingInformation() I even get a NullPointerException:

System.out.println(cp.getChartRenderingInfo().getPlotInfo().getPlotArea().toString());

The JFreeChart chart is correct as far as I can tell - i.e. there are no visible errors when displaying exactly this entity.

Thanks in advance,
mechko

[paradoxoff]

JFreeChart chart = e.createChart();
ChartPanel cp = new ChartPanel(chart);
System.out.println(cp.getScreenDataArea().toString())

--> java.awt.geom.Rectangle2D$Double[x=0.0,y=0.0,w=0.0,h=0.0]

Try to paint your ChartPanel before you retrieve the information.

[mechko]

Try to paint your ChartPanel before you retrieve the information.

Thanks. I tried to call ChartPanel.repaint() with no success as well.

What I just tested was using a ChartComposite instead of the
SWT_AWT Method:

Code: Select all

final ChartComposite frame = 
      new ChartComposite(parent, SWT.NONE, chart, true);			
 frame.redraw();
 System.out.println(frame.getScreenDataArea().toString());

The output is "Rectangle {0, 0, 0, 0}". It's driving me mad. As I said, the ChartComposite including the chart is painted and displayed correctly.

There is also another question concerning this issue: How do I get the instance of ChartPanel or ChartComposite from within a ChartMouseEvent? I know event.getChart(), but is there a way to get the surrounding Panel?

Thanks once more,
mechko




[/code]

[heprom]

Hi mechko,

frame.redraw() might not work, try

Code: Select all

frame.forceRedraw()

It does work, I tried with the simple demos shipped with jfreechart. for instance with SWTTimeSeriesDemo I get: Rectangle {59, 31, 521, 170}
HTH,
Henry

[deryaaltuntas]

I have same problem.It only returns zero values for my case.
But I am using ChartPanel instance with CombinedRangeXYPlot in it.
ConbinedRangeXYPlot has 2 subplots in it

This code gives java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

Code: Select all

chartPanel.getChartRenderingInfo().getPlotInfo().getSubplotInfo(0).getDataArea();

This code gives returns zero values java.awt.geom.Rectangle2D$Double[x=0.0,y=0.0,w=0.0,h=0.0]

Code: Select all

chartPanel.getScreenDateArea() 

This code to get second subplot in x axis gives returns zero values java.awt.geom.Rectangle2D$Double[x=0.0,y=0.0,w=0.0,h=0.0]

Code: Select all

chartPanel.getScreenDateArea(1, 0)  

[John Matthews]

Cross-posted here.