Geometric model in Pharo

> Hi!
>
> I'm actually doing my final-year internship in Thalès and I'm porting
> an application, for creating UI, from VisualWorks to Pharo (Using
> Athens :). The problem is they use a geometric model already
> implemented in VisualWorks (Graphics-Geometry package).
> The features which are very important to have is the possibility to
> convert a figure (like a Circle) to a Polyline representation. (They
> use it, for example, to know if the mouse are on a shape)
>
> That there is something in Pharo that I could use?
>

>
> On Mar 11, 2013, at 4:30 PM, Tristan Bourgois <[hidden email]> wrote:
>
>> Hi!
>>
>> I'm actually doing my final-year internship in Thalès and I'm porting
>> an application, for creating UI, from VisualWorks to Pharo (Using
>> Athens :). The problem is they use a geometric model already
>> implemented in VisualWorks (Graphics-Geometry package).
>> The features which are very important to have is the possibility to
>> convert a figure (like a Circle) to a Polyline representation. (They
>> use it, for example, to know if the mouse are on a shape)
>>
>> That there is something in Pharo that I could use?
>>
>
> look at the PolygonMorph and subclasses.
>
>
>
>
>
> This class implements a morph which can behave as four different objects depending on the the following two facts:
> - is it OPEN or CLOSED?
> - is it SEGMENTED or SMOOTHED.
>
> 1. The OPEN and SEGMENTED variant looks like polyline.
>
> 2. The OPEN and SMOOTHED variant looks like spline (kind of curve)
>
> 3. The CLOSED and SEGMENTED variant looks like polygon. This is actually what you get when you do
>         PolygonMorph new openInWorld
> You get a triangle. See below how to manipulate these objects...
>
> 4. The CLOSED and SMOOTHED variant looks like blob (???)
>
> Prototypes of this morph can also be found in "Object Catalog". Several (different variants) of this object are among "Basic" morphs.
>
> Explore the assiciated morph-menu. It enables you
> - to toggle showing of "handles". They make it possible to
>         - reposition already existing vertices (by moving yellow handles)
>         - create new vertices (by moving green handles)
>         - delete already existing vertices (by dragging and dropping one yellow handle closely
>           nearby the adjacent yellow handle
>   Handles can be made visible/hidden by shift+leftclicking the morph. This way it is possible
>   to quickly show handles, adjust vertices and then again hide handles.
> - making closed polygon open, i.e. converting it to a curve (and vice versa)
> - toggle smoothed/segmented line/outline
> - set up custom dashing (for line, curves or borders of closed polygons
> - set up custom arrow-heads (for lines resp. curves)
>
> ------------------------------------------------------------------------------------------
> Implementation notes:
>
> This class combines the old Polygon and Curve classes.
>
> The 1-bit fillForm to make display and containment tests reasonably fast.  However, this functionality is in the process of being supplanted by balloon capabilities, which should eventually provide anti-aliasing as well.
>
> wiz 7/18/2004 21:26
> s have made some changes to this class to
>
> 1) correct some bugs associated with one vertex polygons.
>
> 2) prepare for some enhancements with new curves.
>
>

>
> On Mar 12, 2013, at 10:14 AM, Tristan Bourgois wrote:
>
>> That's totally what I need! Thanks!
>>
>> But that's not strange to use Morph objects like geometric object?
>>
>> Tristan.
>
> Well, the whole point of Morphs was to be "graphical objects" (in other words, objects that also knew how to draw themselves/ be graphically manipulated).
> Having geometric objects as Morphs is merely a consequence of that philosophy.
>
> Whether you  prefer a more distinct separation between a model and view of that model than what Morphs were built for, is another matter :)
>
> Cheers,
> Henry