[Cuis-dev] scaling an ImageMorph

[Juan Vuletich]

Hi Hannes,

On 3/31/2025 12:48 PM, H. Hirzel via Cuis-dev wrote:
>
> Hi Juan
>
> the solution you provide is good as it is a good workaround. Looks a 
> bit clumsy however constructing two ImageMorph objects as you start 
> with a jpg form. And Mark wants to include this example in a booklet 
> about Morphic.
>

No, #defaultForm doesn't create an ImageMorph. It just answers a sample 
Form.

> Reading a JPG picture into an instance of Form, scaling it and 
> constructing an ImageMorph object works fine as example [1b] in this
>
> https://lists.cuis.st/mailman/archives/cuis-dev/2025-March/010742.html
>
> thread shows.
>
> So I'd like to draw your attention that on the fact that shrinking an 
> ImageMorph object does not work as example 2 in the same thread shows.
>
> The solution to  make ImageMorph>>shrinkBy:  work provided by 
> Weslleymberg Lisboa is shown in this mail
>
> https://lists.cuis.st/mailman/archives/cuis-dev/2025-March/010745.html
>
>
> Current ImageMorph>>minimumExtent implementation
>
> ````
> minimumExtent
>
>       ^ image extent + (2 * self interiorOrigin)
> ````
>
> -------------------------------------------------------------------------------------------
>
>
> Weslleymberg proposal for ImageMorph>>minimumExtent
>
> ````
> minimumExtent
>
>       ^ image extent + (2 * self interiorOrigin) * self scale
>
> -------------------------------------------------------------------------------------------
>
>
> Seems to be pretty straightforward though it took him a considerable 
> time to come up this it. What do you think about this solution? Are 
> there side-effects about this fix? If not I suggest that it should be 
> included.
>
> Kind regards
>
> Hannes
>

The problem was not in ImageMorph. There was a bug in Layout. Aux method 
#minimumLayoutExtent: should work in owner's coordinates, just like 
#fitInto: . I just pushed a fix that does that.

You can try this, and resize the Layout.:
A bettern implementation of ImageMorph could behave more like the Star 
and the Smiley, where the Layout resize can rescale them.

Cheers,

   labelMorph := LabelMorph new
     contents: 'coffee';
     color: Color red;
     padding: 0.

   aForm := ImageMorph defaultForm.

   imageMorph := ImageMorph newWith: aForm.
   imageMorph
      borderWidth: 20;
      borderColor: Color black;
      scaleBy: 0.2;
      padding: 0.

   layoutMorph := LayoutMorph newColumn
       borderWidth: 2;
       borderColor: Color yellow;
       padding: 0;
       separation: 0;
       addMorph: labelMorph;
       addMorph: imageMorph;
       addMorph: Sample01Star new;
       addMorph: Sample03Smiley new;
       "morphExtent: 300 at 300;"
       openInWorld

> On 30/03/2025 8:29 pm, Juan Vuletich via Cuis-dev wrote:
>> On 3/19/2025 6:11 PM, Mark Volkmann via Cuis-dev wrote:
>>> What is the proper way (minimum code) to scale an ImageMorph?
>>> Do I have to scale both the form into which the image file is loaded 
>>> AND the ImageMorph like this?
>>>
>>> filePath := '/Users/volkmannm/Pictures/images/altitude1600.jpg'.
>>> percent := 0.75.
>>> form := Form fromFileNamed: filePath :: magnifyBy: percent.
>>> morph := ImageMorph newWith: form :: scaleBy: percent.
>>>
>>> When I add this morph to a SystemWindow, the image is scaled, but 
>>> there is an orange rectangle of the original size behind the image. 
>>> See the attached screenshot.
>>>
>>> -- 
>>> R. Mark Volkmann
>>> Object Computing, Inc.
>>
>> Just scale the form prior to using it: `(ImageMorph newWith: 
>> (ImageMorph defaultForm magnifyBy: 0.5)) openInWorld.`
>>
>> A new kind of morph that is not part of the BoxMorph hierarchy would 
>> give better flexibility, by not using an `extent` instance variable. 
>> But may be the simplest solution works for you.
>>
>> Cheers,
>> -- 
>> Juan Vuletich
>> cuis.st
>> github.com/jvuletich
>> researchgate.net/profile/Juan-Vuletich
>> independent.academia.edu/JuanVuletich
>> patents.justia.com/inventor/juan-manuel-vuletich
>> linkedin.com/in/juan-vuletich-75611b3
>> twitter.com/JuanVuletich
>>


-- 
Juan Vuletich
cuis.st
github.com/jvuletich
researchgate.net/profile/Juan-Vuletich
independent.academia.edu/JuanVuletich
patents.justia.com/inventor/juan-manuel-vuletich
linkedin.com/in/juan-vuletich-75611b3
twitter.com/JuanVuletich

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