Nice trick.  I hit some similar problems with Roassal showing a Red Square rather than opening a debugger - which is a good versus the image being overrun by debugger windows.  However it appears that #getRenderedForm is not available with Rossal. Can similar be made to work with ROView?  

A couple of related ideas...
1. Using a method like #debugOpen would be easier to remember than #getRenderedForm. 
2. Alternatively, perhaps if the developer clicked on the Red Square this would open just-one debugger at the last point of failure.

cheers, Ben

Alexandre Bergel wrote: 
Hi Veronica,

Debugging visualization is a bit tricky, mainly because of a heretic behavior of Morphic. Your image did not freeze so you should be happy :-)

The best way to debug a visualization, is to render the visualization in a bitmap, instead of having it on screen. For example, if your visualization is:

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
| view |
view := MOViewRenderer new.
view shape rectangle width: [ :e | 100 / e ].
view nodes: (0 to: 20).

view open
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

then replace the last #open with:
	view root applyLayout.
	view getRenderedForm

So, the debuggable script should be:

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
| view |
view := MOViewRenderer new.
view shape rectangle width: [ :e | 100 / e ].
view nodes: (0 to: 20).

view root applyLayout.
view getRenderedForm
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

If your visualization is buggy, then you will get a debugger. If nothing appears, it means there is no bug.
The same trick has to be used for Roassal generated visualization.

Let me know how it goes.

Cheers,
Alexandre


On Sep 20, 2012, at 9:10 AM, Veronica Isabel Uquillas Gomez <vuquilla@vub.ac.be> wrote:

  
Hi Alex,

I have already planned to migrate my tools to use Roassal...
But for now I have to use what we have with Mondrian because we are preparing an evaluation on our tool in Pharo1.4.

I suddenly have a problem that I do not know to detect
I draw a map with dominanceTreeLayout or forcedBaseLayout.
When the layout is dominanceTreeLayout I am getting the red rectangle with the cross. Sometimes i get it immediately or sometimes I see part of the visualization and when i move the scrollbars the red rectangle appears.

How can I debug that?, I haven't changed my code and I have no idea what is failing now
if I open the same visualization with forcedBaseLayout it works fine.

Regards,
Veronica


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