Begin forwarded message:

From: Camillo Bruni <camillobruni@gmail.com>

Subject: [Lsehub-staff] How to Debug :D

Date: May 2, 2013 6:22:06 PM GMT+02:00

To: RMoD private list <lsehub-staff@lists.gforge.inria.fr>

Reply-To: RMoD private list <lsehub-staff@lists.gforge.inria.fr>

Igor: Camillo can you help me debugging this strange athens rendering bug
Cami: sure

Igor: where do you think the bug is? The green path jumps if I change the Y coordinate and it shouldn't...
Cami: no clue...

Igor: Any clue how to get to the bug?
Cami: let's use the ASTInterpreter to interpret two methods with different transformation matrices and see when they diverge.

Result:
-------
- after 1h comparing AST Debugger is ready
- we run the two traces, they do NOT diverge => ????

Conclusion:
-----------
Cairo, which was chosen as reference, did not properly draw the path!!!

So we should publish the code of the ComparingInterpreter a bit and we
can use it for a few more tasks in Pharo ;)