5 Oct
2014
5 Oct
'14
6:52 p.m.
Hi Peter,
I would say, stay at the RTShape level. Trachel objects are for the low
level stuff. For example a
TRArcShape defines an arc based on the geometric property and with RTShapes
you visualize a model
by mapping its attributes to geometric values for the visible (trachel )
shapes.
An UML class diagram is a rectangle with three segments (or three boxes).
The mapping from class attributes
to the class diagram would happen on with RTShape/element/builder...., so
you would need something on that level anyway.
Sure you can define a UML-Trachel shape as one geometric object. But I
would only choose this
way if the object is somehow "static" and "closed".If you want to
change
the object(model) through the
visible representation or connect parts of it with other elements, then
every single element of the
UML-diagram (class label, class vars, class methods) should be accessible
on the RT-Level.
I wouldn't subclass RTShape neither. The whole framework looks like it is
based on builders and
building complex shapes as groups of simpler (RT)shapes.
Maybe something like a group of three RTBoxes. The first box only has a
label, the second
and third box has a list of other elements (vars/methods).
In addition the two other boxes may have different states.
Collapsed (only shows the attribute (var or methods) and the number of
elements
Expanded (show a full list, this may be difficult for classes with many
methods roassal shapes do
not provide something like a scrollable list)
Expanded overview (somethink like the "blueprint" diagram, wiith small
single boxes for every item)
I would start by looking at the "Pharo Smart Browser" (In the Roassal2
image)
It defines boxes for classes and within this (expanded) boxes is a list of
trees for the methods, for an UML - Diagramm you'll use a list of labels
for the methods).
Nicolai
2014-10-03 22:03 GMT+02:00 Peter Uhnák <i.uhnak(a)gmail.com>om>:
Hi,
I am wondering what is the proper level at which should be addressed
composition of elements.
Imagine I want to create a diagram of UML class but I want to be able to
dynamically add and remove new lines and sections, including various
formatting (underline, italics, bold, ...) of each line separately. The
RTUMLClassBuilder (or any other builder for that matter) is not an option
since it's a one time build.
The option I see is to subclass RTShape (let's name it MyRTUmlClass) and
implement method trachelShapeFor: .
Now the issue is, that I cannot use other RTShape (Roassal) elements,
because they would have to be inserted into RTView which may not be
available at the time - is there a way around it?
So the other option is to use TRShape (Trachel) elements instead which
would be fine except I feel like I am duplicating code of roassal elements
(so for TRLabelShape I would copy RTLabel trachelShapeFor: and bend it for
my needs), and the second issue is that in updateFor:trachelShape: I would
need to access internal structure of the element and change it (because for
example a new method was added) - does that break encapsulation?
And finally, from conceptual standpoint what should be the content of
RTView elements? Because if I have diagram full of UML classes I probably
don't care about the content of them when doing layouting - so I would
prefer to have only MyRTUmlClass elements there and not every single label
inside it (as is the case of RTUmlClassBuilder), because otherwise having
access to RTView elements is useless and I must keep reference to correct
objects myself.
Thanks!
Peter
p.s.: Is it currently possible to format text? I saw only color, font and
size... what about underline/italics/bold?
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