[gt-users] Using the AnnotationSketch module: output formats and default styles

[James Casbon]

2009/4/23 Sascha Steinbiss <steinbiss at zbh.uni-hamburg.de>:
> For an example, see the attached new version of
> gtpython/gt/annotationsketch/canvas.py.

OK, great.  I have attached one which reuses the definitions in
graphics.py to avoid magic numbers.

> Any ideas about how to degrade gracefully in user code still instantiating
> CanvasCairoFile classes?

Since you need to create the gtlib canvas before knowing the filename,
you cannot guess.  The best I can think is to have a module level
default which clients can tweak if they want.  See attached

> style class itself, but in the layout logic. The behaviour of returning None
> if no value is found is intentional because it leaves the decision about how
> to handle this case to the programmer. Of course, you are free to subclass
> the Style class and add a thin layer in your code, implementing the
> behaviour stated above.

Ok, sure, sounds reasonable. Thanks for all the help,

James
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