[Cuis-dev] Morphic3 at work

[Hernán Wilkinson]

I’m not sure, but some of the things sketchpad did may be useful …


*Hernán WilkinsonAgile Software Development, Teaching & Coaching*
*Phone: +54-011*-4893-2057
*Twitter: @HernanWilkinson*
*site: http://www.10Pines.com <http://www.10pines.com/>*
Address: Alem 896, Floor 6, Buenos Aires, Argentina


On Sun, 14 Sep 2025 at 05:58 Hilaire Fernandes via Cuis-dev <
cuis-dev at lists.cuis.st> wrote:

> On the paper, there are no notion of line nor intersection as in DrGeo.
>
> The straight lines the user draws with the tools are just plain writing in
> the paper constrained by the tool (line6):
>
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> GeometryTool>>mouseButton1Down: event localPosition: localPosition
> 	(self paper writingTool notNil and: [self inStrokeZone: localPosition])
> 		ifTrue: [" initiate stroke along the tool "
> 			lastHandPosition := nil.
> 			" Let the paper to handle the hand stroke, constraint the hand position to be aligned with a tool border ! "
> 			self paper mouseButton1Down: event localPosition: (self externalize: (self constrainToDirection: localPosition))]
> 		ifFalse: ["Initate a drag of the tool "
> 			lastHandPosition := self externalize: localPosition ]
>
>
>
> There are notion of stroke zone (line 1 above), specific to each tool
> (SetSquare below):
>
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> SetSquare>>inStrokeZone: localPosition
> 	(self strokeZoneX containsPoint: localPosition) ifTrue: [
> 		strokeSide := #ox.
> 		^ true].
> 	(self strokeZoneY containsPoint: localPosition) ifTrue: [
> 		strokeSide := #oy.
> 		^ true].
> 	strokeSide := nil.
> 	^ false
>
>
> Then, the specific constraint for a given tool as the SetSquare:
>
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> SetSquare>>constrainToDirection: localHandPosition
> 	^ strokeSide == #ox
> 		ifTrue: [localHandPosition x @ 0]
> 		ifFalse: [ 0 @ localHandPosition y]
>
>
> Again, the Morphic3 framework proved to be of an invaluable assistance in
> such design. Even Juan did not realize its usefulness until recently, so
> far for him the Morphic protocol to navigate from one reference frame to
> another one was only useful for internal usage, not particularly intended
> to the GUI designer. It proved the opposite and it reminds me this Alan Kay
> quote: *Simple things should be simple and complex things should be
> possible.* This is exactly where we are with Morphic3.
>
> Regarding snapping with line shapes, it should be doable. Indeed the
> handwritings in a paper are grouped in StrokeGroupMorph (it manages the
> writing occurring between a pen down and pen up gesture). Such groups could
> self analyze themselves to recognize usual shapes as straight line, circle.
> Then, you could have a cross analysis between such groups to identify the
> intersections between them. Perfectly doable. When you have these
> information available, snapping to a given tool is easy. The evil is in the
> details of course.
>
> There are snapping between the ruler and the set square. In the demo, you
> can observe the set square aligns itself with he ruler when it is moved
> toward it and the two are more or less parallel.
>
> Dybo targets all kind of teaching in school. In math, the geometry tools
> are the minimum to have, I will implement the compass tool next. Snapping
> is kind of very cool to have to attract the attention of math teachers, but
> I need first to develop other tooling for other taught subject. The
> geometry tools are special because they are used to sketch on the paper,
> the other tool to develop would be different, easier to implement. These
> are dynamic knowledge models represented by a box morph and scripted with
> smalltalk code edited by the user (teacher or student). The aim is high
> indeed.
>
> Hilaire
>
>
> Le 14/09/2025 à 09:06, Luciano Notarfrancesco a écrit :
>
> Very cool! Do the tools snap to lines, intersections, etc?
>
> -- http://mamot.fr/@drgeo
>
> --
> Cuis-dev mailing list
> Cuis-dev at lists.cuis.st
> https://lists.cuis.st/mailman/listinfo/cuis-dev
>
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