Re: [Texmacs-dev] Drawing mode notes, vector diagrams, geometric construction

[Henri Lesourd]

1) Rotations

a) not any way to construct the vectors at specific angles
b) and drawn with their tail anchored to a specific point

>used the ``rotate'' mode to turn it to about the right angle.
>
We could add a manual input for typing the angle one wants.

>other problem was then getting the ends of the vectors aligned
>the way they should be.
>
Yes, it's because we use the barycenter as the axis of the
rotation. So once the object has been rotated, it is not very
convenient to connect the 2nd point of the 1st vector and the
1st point of the 2nd one (or you move one point, but then you
change the angle :-( ...).

==>

  To solve this problem, we need :

  (i) to be able to input a precise value for the angle ;

  (ii) to be able to choose the center of the rotation. It
       will be something like one clicks first, then the center
       is marked, and then one clicks a second time, and then
       the rotation proceeds as it is currently (if we are in
       manual mode), or the object is immediatly rotated (if
       we are using a precise value of the angle that has been
       inputted previously by the user).


OK, I put that feature on my list, so if no other change is
suggested before I start to implement it, it will be as it
is described above.


2) Keyboard (arrow keys) inside a text box in graphics mode

>There was also some trouble with editing the labels [...] Normally,
>in running text math mode, I type a C-f or right-arrow to move out
>of the blue box and back to the rest of the expression. In drawing
>mode, however, when I type one of those keys, the picture slides
>over.
>
This is clearly a bug that is to be corrected soon (thank
you for noticing it, because with simpler markup, it seems
that it is not occurring, so I didn't saw it yet).

>Normally, in running text math mode, I type a C-f or right-arrow to 
move out
>of the blue box and back to the rest of the expression. In drawing mode,
>however, when I type one of those keys, the picture slides over.
>
That is the way it should be, editing inside a text box should be
exactly the same as when you are outside of a graphics.


3) Scrolling

>Positioning the diagram with arrow keys is great, though I would like 
to have
>finer-grained movements, perhaps by holding Shift or Ctrl while 
pushing the
>arrow key.
>
I had the same idea, but I don't know exactly the length of this 
finer-grained
movements (or perhaps should be proportional to the length of the 
wide-grained
movements, let's say 10x finer than the usual movements ?).


Best, Henri