I think the intention of Roassal lines is to be connected with elements. If you want only draw lines without any connection to elements, use directly Trachel. I guess

-=-=-=-

| v line |

v := RTView new.

line := TRLineShape new from: 0@0 to: 100@100 color: Color blue.

v canvas addShape: line.

^ v open

-=-=-=-

Cheers,

Juraj

On Sep 12, 2014, at 6:53 PM, kilon alios <kilon.alios@gmail.com> wrote:

well thats not an one liner and you still connect elements with it. I just wanted to pass coordinates to a line and draw it. So I would prefer it if I could pass points instead of elements.��

On Sat, Sep 13, 2014 at 12:38 AM, Juraj Kubelka <juraj.kubelka@gmail.com> wrote:

OK, then you can write:

-=-=-=-

| v elements edge |

v := RTView new.

elements := (RTEllipse new

size: #yourself;

color: Color red) + RTLabel elementsOn: #(10 20).

edge := RTDirectedLine new

color: Color blue;

edgeFrom: elements first to: elements second.

v

addAll: elements;

add: edge.

RTGridLayout on: elements.

elements @ RTDraggable.

^ v open

-=-=-

Cheers,

Juraj

On Sep 12, 2014, at 6:30 PM, kilon alios <kilon.alios@gmail.com> wrote:

yes i know about the example of a line connecting with other shapes. I wanted just a simple line by itself starting from one point and ending to another in a single line of code.

On Sat, Sep 13, 2014 at 12:26 AM, Juraj Kubelka <juraj.kubelka@gmail.com> wrote:

I have checked RTDirectedLine and it is not supposed to use the way you want. Basically RTEdge is the object you want to manipulate with.

I do not know what is the objective of your example. But there is way how you could write it.

-=-=-
| v elements models |
models := (10 to: 60 by: 1).
v := RTView new.
elements := (RTEllipse new size: #yourself; color: Color red) + RTLabel elementsOn: models.
v addAll: elements.
RTEdge buildEdgesFromObjects: models from: #yourself to: [ :i | i // 2 ] inView: v.
RTGridLayout on: elements.
elements @ RTDraggable.
v @ RTDraggableView.
v canvas color: Color black.
v open.
-=-=-

Cheers,
Juraj

On Sep 12, 2014, at 5:03 PM, kilon alios <kilon.alios@gmail.com> wrote:

> Ok here comes the first question
>
> how I change the background color of RTView ?
>
> also
>
> when I do this
>
> v := RTView new.
> shape := RTEllipse new size: 20; color: Color red. shape := shape + RTLabel.
> es := shape elementOn:'hello'. v add: es.
> line := RTDirectedLine new pointsFrom: 20@20 To: 30@30.
> es2 := line element.v add: es2.
> es @ RTDraggable.
> v @ RTDraggableView .
> v open.
>
> I am getting an error
>
> MNU Array >> element
>
> why ?
>