[Cuis-dev] Clipping operation

[Hilaire Fernandes]

The more I look the more it looks odd and I may have to handle it 
differently.

The DrGeo canvas has both drawing operations and submorphs:

  * operations to draw the axes, graduations and grid, I can get those
    drawings clipped by adding the canvas to a morph responding true to
    clipsLastSubmorph message
  * submorphs added to the canvas, those are lines, circles, polyline,
    locus to represent the geometric items. I like to use morph for
    this, it is a good level of abstraction, easier to interact with for
    debugging and optimizing, particularly for the locus. They all
    require to be clipped too, to the canvas bounds. From my
    understanding, I think I have a problem here with the
    clipsLastSubmorphh pardigm and I may need a dedicated MorphicCanvas.

Hilaire

Le 30/04/2020 à 10:28, Thierry Goubier via Cuis-dev a écrit :
> in Cuis, Submorph clipping only happens for one submorph, and only if 
> aMorph>>#clippedSubmorph is true (and that clips to the parent morph, 
> so, if your wheel morphs are submorphs of your overall frame, then 
> incorrect clipping for the clipped submorph).
>
> In a case like yours, you will probably need to add a morph that do 
> nothing but clipping, to ensure that the morph you are drawing in has 
> the exact same bounds as its parents.

-- 
GNU Dr. Geo
http://drgeo.eu

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