Thanks for working on this very important problem. Legend are indeed important.

I would recommend, however, to have a builder for this. 

I started to work on a legend builder.  Here is an example:

-=—=-=-=—=-=-=—=-=-=—=-=-=—=-=-=—=-=

| v shape legendBuilder elements |
v := RTView new.

"We add some elements"
shape := RTShapeBuilder new circle
size: [ :c | 10 max: (c numberOfMethods) / 7 ];
fillColor: Color gray;
if: [ :cls | '*Array*' match: cls name ] fillColor: Color blue;
if: [ :cls | '*Dictionary*' match: cls name ] fillColor: Color green;
if: [ :cls | '*Set*' match: cls name ] fillColor: Color red;
current.
elements := shape elementsOn: (Collection withAllSubclasses).
elements @ RTPopup.
v addAll: elements.
RTGridLayout on: v elements.

"We add the legend"
legendBuilder := RTLegendBuilder new view: v.
legendBuilder name: 'array' color: Color blue.
legendBuilder name: 'dictionary' color: Color green.
legendBuilder name: 'set' color: Color red.
legendBuilder render.

"Open the view"
v open
-=—=-=-=—=-=-=—=-=-=—=-=-=—=-=-=—=-=

Result is the following:

Feel free to complete the builder. There is a lot to add more (e.g., spacing between the each item of the legend).

Does this make sense?

Cheers,

Alexandre

On Apr 2, 2014, at 9:14 AM, Usman Bhatti <usman.bhatti@gmail.com> wrote:

Hello,

I started to see how an implementation of a legend can be provided in Roassal 2.

I added this methods in TRCanvas>>addLegend:.. 


addLegend: aDictionary
| startPos interNodeWidth|
interNodeWidth := 30.
fixedShapes isEmpty ifTrue: [ startPos := self topLeft + (10@20) ] ifFalse: [startPos := self topLeft + (10@40)].
aDictionary associationsDo: 
[ :association |
|shape|
self
addFixedShape:
(TRBoxShape new
size: 10;
translateTo: startPos;
color: association value).
shape := (TRLabelShape new
text: association key;
fontSize: 10).
shape translateTo: (shape width /2) + startPos x + 10 @ startPos y.
self
addFixedShape: shape.
startPos := startPos x + shape width + interNodeWidth @ startPos y ].


Usage example:
============================================
| v e1 e2 l |
v := RTView new.
e1 := (RTEllipse new size: 30; color: (Color blue alpha: 0.3)) element.

e2 := (RTEllipse new size: 30; color: (Color yellow alpha: 0.3)) element.

l := (RTLine new attachPoint: RTShorterDistanceAttachPoint new) edgeFrom: e1 to: e2.
 
e1 @ RTDraggable.
e2 @ RTDraggable.

v canvas addLegend: ({ 'Red' -> Color red. 'very very green' -> Color green.'blue' -> Color blue. 'Cyan' -> Color cyan. 'Cyan2' -> Color cyan}) asDictionary.
v addAll: (Array with: l with: e2 with: e1).


v open

=========================================
Questions for Roassal guys:

- Is TRCanvas the right place to add a legend? I started from here because it allows adding fixed shapes to the view. 
- how do I tell the canvas not to draw where meta-items are drawn such as legend(s), menus, etc.

If this is correct, Leo might continue from here on and put this code in a class to add more customizations.

tx,
Usman
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