PRException after multiple zooming?! (0.9.6)

[Martin Goebel]

Hi,

I'm currently tryoing out the JFreeChart zooming capabilities. After several zoom operations, I get a

sun.dc.pr.PRException: endPath: bad path

exception.

This is how I can reproduce it:

- Use MouseZoomDemo
- The original range is -2.25 to 2.25 on yAxis and -11 to 11 on xAxis.
- Now I zoom in the center, always specified by a 2 x 2 grid zoom rectangle.
- After 5 zoom operations, the range now being at -0,0000250 to 0,0000250 on yAxis and -0,0005 to 0,0005 on xAxis, I get the above exception. (full stack trace below).

Does anyone has an explanation (a bug? has the zooming reached some kind of limitation?) or (better) knows a way how to fix it?

Regards,
Martin





sun.dc.pr.PRException: endPath: bad path

at sun.dc.pr.Rasterizer.endPath(Rasterizer.java:537)

at sun.java2d.pipe.DuctusRenderer.createShapeRasterizer(DuctusRenderer.java:374)

at sun.java2d.pipe.DuctusShapeRenderer.renderPath(DuctusShapeRenderer.java:57)

at sun.java2d.pipe.DuctusShapeRenderer.draw(DuctusShapeRenderer.java:45)

at sun.java2d.SunGraphics2D.draw(SunGraphics2D.java:2182)

at com.jrefinery.chart.renderer.StandardXYItemRenderer.drawItem(StandardXYItemRenderer.java:397)

at com.jrefinery.chart.plot.XYPlot.render(XYPlot.java:1135)

at com.jrefinery.chart.plot.XYPlot.draw(XYPlot.java:1082)

at com.jrefinery.chart.JFreeChart.draw(JFreeChart.java:764)

at com.jrefinery.chart.ChartPanel.paintComponent(ChartPanel.java:831)

at javax.swing.JComponent.paint(JComponent.java:808)

at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4771)

at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4724)

at javax.swing.JComponent._paintImmediately(JComponent.java:4668)

at javax.swing.JComponent.paintImmediately(JComponent.java:4477)

at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)

at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)

at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)

[David Gilbert]

Hi Martin,

The problem can occur in several ways, the most likely here is that a Shape (probably a Line2D) is being drawn that has very large coordinates in Java 2D space. The definition of "large coordinates" varies by platform I think.

I recall reading in the Java bug database a while back that the only workaround is to implement your own clipping algorithms...I haven't done that, because I don't know how to do it efficiently. I'll have another hunt through the Java bug database and see what the current status is...

Regards,

Dave Gilbert

[Martin Goebel]

Hi Dave,

thanks for your quick answer!
In the meantime I found an entry in the BugParade:

http://developer.java.sun.com/developer ... 55500.html

Also, a software called VisAD had the same problem
(http://www.loci.wisc.edu/visbio/dev.html):

Other VisAD Bugs
From zooming too far into a Java2D display:
sun.dc.pr.PRException: endPath: bad path [...]

In
http://www.biojava.org/pipermail/biojav ... 02875.html

someone states that this only happens with 1.4 and antialiasing on.


Maybe I somehow have to limit zooming to a certain degree or switch off antialiasing then ( I tried switching it off, and it helps, but doesn't look good, of course .

I'd be glad if you'd find another workaround

Regards,
Martin

[Charles H Martin]

I had a bug like this forever, and sometimes I still get it if I zoom in too much.

Then I discovered I had a renderer set improperly. You might check this.

I re-wrote the zoom for my plots and added my own clipping routines.


(VisAD is very sophisticated stuff...if , you need 3D, you might also try Stanford's jfreehep)

Charles