bugGNU Octave - Bugs: bug #43585, rectangle wrong axis calculation


bug #43585: rectangle wrong axis calculation

Submitter:  Andreas Weber <andy1978>
Submitted:  Wed 12 Nov 2014 10:38:07 AM UTC
Category:  Octave Function Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Regression
Status:  Confirmed Assigned to:  None
Originator Name:  Open/Closed:  * Open
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Fri 16 Dec 2016 10:59:27 PM UTC, comment #2: 

This issue is (slightly changed) still present in Octave 4.2.0.

When I run the code from comment #0, then afterwards axis() gives me

ans =
   0.00000   6.00000   0.13387   4.86613

So the calculation of the x-limits has improved, but the y-limits are still off. Accordingly, the top (and bottom) line of this square are still not displayed in the figure.

Hartmut <hardy>
Tue 03 Feb 2015 05:50:55 AM UTC, comment #1: 

The problem seems to be that the C++ xlim and ylim updaters are called when the following code is executed in patch.m

  ## FIXME: This is a hack to get 'layer' command to work for 2D patches
  ##        Alternative is much more complicated surgery in graphics.cc.
  ##        of get_children_limits() for 'z' axis and 'patch' object type.
  if (! ishold ())
    if (isempty (get (htmp, "zdata")))
      set (hax, "zlim", [-1 1]);

Rik <rik5>
Group administrator
Wed 12 Nov 2014 10:38:07 AM UTC, original submission:  

Since cset 75f8926deef1 the following code only shows the axes because axis limits are calculated wrong.

scatter ([3 5 6], [4 2 1])
axis equal
rectangle ('Position', [0, 0, 5, 5]);

axis () returns

ans =
   1.7500   4.2500   1.5000   3.5000

so no scatter point or rectangle is visible. Octave 3.8.2 and default cset 10082673a8f0 (parent of 75f8926deef1) returns for axis:

ans =
  -0.12500   6.12500   0.00000   5.00000

which is okay. Btw, the "error: set: "zlim" is read-only" for rectangle, introduced from cset 75f8926deef1, was fixed with cset 87c3848cf3c0.

Andreas Weber <andy1978>
Group Member


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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2015-02-22 mtmiller CategoryNone Octave Function
    2015-02-03 rik5 StatusNone Confirmed

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