[Octave-bug-tracker] [bug #54640] maketform of transforming triangles is wrong

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?54640>

                 Summary: maketform of transforming triangles is wrong
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Mon 10 Sep 2018 10:34:06 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Tis Veugen
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.1
        Operating System: Microsoft Windows

    _______________________________________________________

Details:

I use function:
trafo = maketform ("affine", triangle_corners, corners);

for transforming triangles. Applying the transform shows wrong result.

In the attached example script I move the top corner slightly to the right.
The result is that the right bottom corner is moved slightly upwards.
Again I move the top corner more to the right. The result is that the right
bottom corner is moved more upwards.

Please, take a look at the transform construction.



    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Mon 10 Sep 2018 10:34:06 AM UTC  Name: nose.png  Size: 85KiB   By: None

<http://savannah.gnu.org/bugs/download.php?file_id=44962>
-------------------------------------------------------
Date: Mon 10 Sep 2018 10:34:06 AM UTC  Name: btf.m  Size: 611B   By: None

<http://savannah.gnu.org/bugs/download.php?file_id=44963>

    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?54640>

_______________________________________________
  Message sent via Savannah
  https://savannah.gnu.org/