Hi Alex,

Thanks for the work on improving the layouts.

I'm confronted with a problem with RTClusterLayout. 

|elements view interval centerElement|

view := RTView new.

interval := (2 to: 4).

elements := ((RTEllipse new color: Color red; size: [:each | each + 30]) + (RTLabel new text: 'very very very long names')) elementsOn: interval asOrderedCollection.

centerElement := ((RTEllipse new color: Color green; size: [:each | each + 30]) + (RTLabel new text: 'Center Node')) elementOn: 1.

elements add: centerElement.

elements @ RTDraggable.

view addAll: elements.

interval do: [:each | view add: (RTEdge from: (view elementFromModel: 1) to: (view elementFromModel: each)) + (RTLine new color: Color purple) ].

view edges do: [ :each | each trachelShape pushBack ].

(RTClusterLayout new horizontalGap: 200) on: view elements.

view open

With fewer nodes, I get the problem where nodes overlap the center node:

<Screen Shot 2014-07-07 at 10.41.59 AM.png>

It works well when I have much more nodes:

<Screen Shot 2014-07-07 at 10.43.16 AM.png>

Any idea how can i fix this problem?

thanx.

usman

On Thu, Jul 3, 2014 at 8:27 PM, Alexandre Bergel <alexandre.bergel@me.com> wrote:

Hi!

Daniel has worked on additional circle layouts, which are now included in Roassal.

We now have RTEquidistantCircleLayout and RTWeightedCircleLayout in addition to RTCircleLayout and RTCenteredCircleLayout

Consider this small script:

=-=-==-=-==-=-==-=-=

| view aux |

view := RTView new.

aux := RTEllipse new.

aux color: Color red.

1 to: 20 do: [ :i |

aux sizeElement: i*4+5.

view add: (aux elementOn: i) ].

RTCircleLayout 

new 

initialRadius: 150;

on: view elements.

view open

=-=-==-=-==-=-==-=-=

It produces the output:

<Screen Shot 2014-07-03 at 2.14.59 PM.png>

There are two recurrent problems with this rendering:

- circles are not centered

- circles overlaps and this overlap can be avoided since there is spaces between the small circles. The layout does not consider the size of the elements

RTEquidistantCircleLayout and RTWeightedCircleLayout  address these problems.

In the script above, replacing RTCircleLayout by RTWeightedCircleLayout produces the following:

<Screen Shot 2014-07-03 at 2.17.20 PM.png>

The space is allocated to each element according to its size.

A variation of this situation may be seen with the following:

=-=-==-=-==-=-==-=-=

| view aux |

view := RTView new.

aux := RTEllipse new.

aux color: Color red.

1 to: 10 do: [ :i |

aux sizeElement: i*10+5.

view add: (aux elementOn: i) ].

RTWeightedCircleLayout 

new 

initialRadius: 150;

on: view elements.

view open

=-=-==-=-==-=-==-=-=

The script produces 

<Screen Shot 2014-07-03 at 2.20.07 PM.png>

It may happens however that you want always the same space between the elements. You should therefore use RTEquidistantCircleLayout as in:

=-=-==-=-==-=-==-=-=

| view aux |

view := RTView new.

aux := RTEllipse new.

aux color: Color red.

1 to: 10 do: [ :i |

aux sizeElement: i*10+5.

view add: (aux elementOn: i) ].

RTEquidistantCircleLayout 

new 

initialRadius: 150;

on: view elements.

view open

=-=-==-=-==-=-==-=-=

It produces the following:

<Screen Shot 2014-07-03 at 2.20.18 PM.png>

The work of Daniel may be found in Roassal2.

Thanks Daniel!

Cheers,

Alexandre

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

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