[PD] what is the purpose of following options on canvas properties?

[João Pais]

and to do better all those things Frank said (which are quite useful), you  
can send a donecanvasdialog message to the patch window, with all these  
parameters in a funny order. I'm not sure if there's an explanation patch  
in the manuals.

>> I am having a hard time understanding what is the purpose of following
>> options on the canvas properties window. they apparently have no effect
>> on 0.42.5:
>>
>> X units per pixel
>> Y units per pixel
>>
>> and
>>
>> X range from/to
>> Y range from/to
>
> They are used in graph on parent (GOP) subpatches/abstractions and with  
> canvases
> displaying data structures (DS). Maybe they are used somewhere else,  
> too, but these
> are the cases, where I have changed these properties.
>
> For data structures you can scale the displayed values by changing the  
> X/Y
> units settings. A common use is to invert the y-axis so larger values are
> painted above smaller ones.
>
> X/Y ranges come into play with GOP: If you have a canvas with a DS  
> inside, you often
> want to make the ranges be the same as the X/Y "size" of the canvas.
>
> Ciao


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