[Moose-dev] Re: Rotating labels around a circular shape

Thanks Milton!

It works like a charm :-)

Cheers,

Offray

On 24/12/15 10:01, milton mamani wrote:

Hi Offray

Can you try the next piece of code.

.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.= | view center data diameter angle gap | diameter := 100. gap := 5. view := RTView new. data := #('lion-o' 'tigro' 'chitara' 'munra' 'ozimandias' 'Dr Manhatan').

center := RTEllipse new size: diameter; color: Color white; borderColor: Color veryLightGray. view add: center element. 1 to: data size do: [ :index | | label | angle := (index * 360/ data size) degreesToRadians. label := (RTRotatedLabel new text: (data at: index); height: 5) element. label translateBy: (Point r: label trachelShape notRotatedWidth/2+(diameter/2)+gap theta: angle). view add: label. angle := angle radiansToDegrees. angle := angle + ((angle between: 90 and: 270) ifTrue: [ 180 ] ifFalse: [ 0 ]). label trachelShape angleInDegree: angle. ]. view

.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=.=

Cheers, Milton

2015-12-23 20:36 GMT-04:00 Offray Vladimir Luna Cárdenas <offray.luna@mutabit.com mailto:offray.luna@mutabit.com>:

Hi,

I'm trying to understand the code behind the figure here to rotate
labels:



So, I made a minimal example to start with, here (code is at
http://ws.stfx.eu/N6ZG4BAIBO00 )



Now I would like to rotate the text to made it look like the first
image. I presume that the code that made this possible for the
first case is this one:


====================
RTBundleBuilder>>createLabelFor: e view: aView
    | lbl |
    lbl := label elementOn: e model.
    self interaction setUpElement: lbl.
    aView add: lbl.
    e addCallback: (TRTranslationCallback new block: [
        | angle |
        angle := (e position - center ) theta.
        lbl translateTo: e position+((lbl trachelShape
notRotatedWidth/2) * (angle cos @ angle sin)).
        angle := angle radiansToDegrees.
        angle := angle + ((angle between: 90 and: 270) ifTrue: [
180 ] ifFalse: [ 0 ]).
        lbl trachelShape angleInDegree: angle ] ).
    e translateTo: e position.
====================

but I can not quite understand the lines

lbl translateTo: e position+((lbl trachelShape notRotatedWidth/2)
* (angle cos @ angle sin)).

and

angle := angle + ((angle between: 90 and: 270)  ifTrue: [ 180 ]
ifFalse: [ 0 ]).

Could some body explain me how to incorporate rotation to the
first basic example at http://ws.stfx.eu/N6ZG4BAIBO00 (second
image of this mail).

Thanks,

Offray

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