[PD] Tk Zoom

[Scott R. Looney]

i may be totally out of my depth here as i'm not a programmer but i believe
MaxMSP was able to do zooming through the use of Juce. it certainly wasn't
available beforehand in any of the 4.X series. personally i find zooming to
be one the most massively useful things when editing patches. being old-ish
my eyes definitely have more issues than they used to...

scott

On Wed, Feb 22, 2012 at 10:32 AM, Mathieu Bouchard <matju at artengine.ca>wrote:

> Le 2012-02-22 à 09:31:00, Hans-Christoph Steiner a écrit :
>
>> On Feb 22, 2012, at 12:48 AM, Mathieu Bouchard wrote:
>>
>>> How do you do zooming with Tcl/Tk ?
>>> I mean... I implemented zooming using a big workaround which wouldn't
>>> have worked with Pd externals... is there a trouble-free way to zoom ?
>>>
>>
>> Didn't you use Tk scaling?  That's what I mean. Yes, this would not work
>> with existing GUI objects.
>>
>
> « Tk Scaling » is the name of a font measurement ratio for pt/px
> conversions, right ?
>
> TkCanvas' «scale» command is unrelated, and does not do zoom, because it
> changes the size of items. The difference between that and zoom is that Tk
> doesn't make you see the prescaled coordinates, it still interacts with you
> only in terms of actual pixels. This means that most of the time, you'd
> have to scale the values on your own using [expr {$x*$scale}] and stuff.
>
> In DesireData, I avoid TkCanvas's «scale» command entirely, and I make
> every canvas item creation/modification through a function that scans the
> arguments of the item, scales all coords it sees, scales the thickness of
> lines, scales the font sizes, automatically decides tags to be used, and
> figures out what to do differently in create vs modify.
>
> That way, the widget's behaviour does not have to implement zoom, it does
> not have to implement modification-functions (because the create-function
> is able to redraw an existing thing), it does not have to implement the
> delete-function (because the enforced common tag makes a single command
> delete), etc.
>
> That's not compatible with t_widgetbehavior and couldn't possibly be made
> to be.
>
>
>  ______________________________**______________________________**
> __________
> | Mathieu BOUCHARD ----- téléphone : +1.514.383.3801 ----- Montréal, QC
>
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