Hi!

Thanks Peter for having spotted the problem. I have fixed it somehow (“somehow” because this is not an ideal solution, but good enough for now). 
Try this after having updated Roassal:
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
| v lbls es e1 e2 a1 a2 layout stepping|
v := RTView new.
lbls := RTLabel new elementsOn: #(#First #Second).
es := RTEllipse new
size: 30;
borderColor: Color black;
elementsOn: #(#source #dest).
v
addAll: lbls;
addAll: es.
es @ RTDraggable.
es @ RTLabeled.
e1 := RTArrowedLine new
withContinuousCircleAttachPoint;
color: Color black;
edgeFrom: es first to: es second.
v add: e1.
e2 := RTArrowedLine new
withContinuousCircleAttachPoint;
color: Color black;
edgeFrom: es second to: es first.
v add: e2.
a1 := RTAnchorConstraint new.
a1 anchorShape size: 10.
a1 guideLine color: Color red.
a1
element: lbls first;
edge: e1;
balance: 0.2;
minDistance: 10;
build.
(a2 := RTAnchorConstraint new)
element: lbls second;
edge: e2;
balance: 0.2;
minDistance: 10;
build.
layout := RTForceBasedLayout new
charge: -450; length: 100; 
doNotUseProgressBar; applyOn: es; yourself.
layout initialLayout: RTSugiyamaLayout new.
layout nodes: es.
layout start: es.
layout edges: { e1 . e2 }.
stepping := RTSpringLayoutStepping new 
view: v; layoutWithoutPreparing: layout;
afterBlock: [ v canvas camera focusOnCenter].
v addAnimation: stepping.
^ v
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Here is a screenshot:

And this is all animated. Cool stuff!

Alexandre
-- 
_,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
Alexandre Bergel  http://www.bergel.eu
^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

On Mar 10, 2016, at 12:42 PM, Peter Uhnák <i.uhnak@gmail.com> wrote:

> To which problem?

The problem is that RTSpringLayoutStepping always uses all the elements in the view and ignores what you set to the layout.

This is a problem, because it will try to also layout the anchor, but that will trigger the anchor to fix itself… and we get endless spinning.

On Thu, Mar 10, 2016 at 4:21 PM, Johan Fabry <jfabry@dcc.uchile.cl> wrote:

On Mar 10, 2016, at 12:08, Alexandre Bergel <alexandre.bergel@me.com> wrote:


There is no other solution? Alex, do you have any idea?

To which problem?

Copy-paste from original mail:

anchor constraints: they do not play well with layouts and animations. Try the code below (adapted from the example to use the layout and animation of LRP ) and you will see that the circles keep spinning around, they never stop. I think it would be better for them to stop ;-)

| v lbls es e1 e2 a1 a2 layout stepping|
v := RTView new.
lbls := RTLabel new elementsOn: #(#First #Second).
es := RTEllipse new
size: 30;
borderColor: Color black;
elementsOn: #(#source #dest).
v
addAll: lbls;
addAll: es.
es @ RTDraggable.
es @ RTLabeled.
e1 := RTArrowedLine new
withContinuousCircleAttachPoint;
color: Color black;
edgeFrom: es first to: es second.
v add: e1.
e2 := RTArrowedLine new
withContinuousCircleAttachPoint;
color: Color black;
edgeFrom: es second to: es first.
v add: e2.
a1 := RTAnchorConstraint new.
a1 anchorShape size: 10.
a1 guideLine color: Color red.
a1
element: lbls first;
edge: e1;
balance: 0.2;
minDistance: 10;
build.
(a2 := RTAnchorConstraint new)
element: lbls second;
edge: e2;
balance: 0.2;
minDistance: 10;
build.
layout := RTForceBasedLayout new
charge: -450; length: 100; 
doNotUseProgressBar; applyOn: es; yourself.
layout initialLayout: RTSugiyamaLayout new.
stepping := RTSpringLayoutStepping new 
view: v; layout: layout;
afterBlock: [ v canvas camera focusOnCenter].
v addAnimation: stepping.
^ v


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Johan Fabry   -   http://pleiad.cl/~jfabry
PLEIAD and RyCh labs  -  Computer Science Department (DCC)  -  University of Chile


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