bugGNU Octave - Bugs: bug #48142, the disappearance of the plotted...

 
 

bug #48142: the disappearance of the plotted lines after "axis equal"

Submitted by:  None
Submitted on:  Mon 06 Jun 2016 01:29:13 PM UTC  
 
Category: PlottingSeverity: 3 - Normal
Priority: 5 - NormalItem Group: None
Status: ConfirmedAssigned to: None
Originator Name: A JapaneseOriginator Email: -unavailable-
Open/Closed: OpenRelease: 4.0.2
Operating System: Microsoft Windows

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Mon 06 Jun 2016 04:35:22 PM UTC, comment #1:

There are two different problems here. This bug report is about issues with "axis equal". If you are having a "freeze" with the version of Octave made by Tatsuro you should report that in a different bug report.

Steps to reproduce axis bug:

The problem is most likely in gl-render.cc where Octave tries to avoid drawing lines which are outside of the current axis limits. This speeds things up because there may be significant portions of the plot which are outside the current viewing limits. However, there definitely seems to be something wrong here. My last command resets the axis to encompass a very wide area around the existing triangle and cause the triangle to re-appear.

As a workaround, you can also use the gnuplot toolkit instead of qt or fltk.

Rik <rik5>
Project Administrator
Mon 06 Jun 2016 01:29:13 PM UTC, original submission:

Hello!

Octave 4.0 looks good. However, I am experiencing a strange thing in plotting.
The following example is the simplest case I have figured out. When I try to plot
a equlilateral triangle, a triangle appears in the figure window. Then, to get
the right shape, I set "axis equal". After that, the triangle disappears although
the metrics of the x-axis and y-axis are set to equal.

>> x=[0 1 1/2 0]

x =

0.00000 1.00000 0.50000 0.00000

>> y=[0 0 sqrt(3)/2 0]

y =

0.00000 0.00000 0.86603 0.00000

>> plot(x,y)

I use the Japanese version of Windows 7. This also occurs on Octave 3.8.2.

Although I wrote the above report some months ago, I did not send it to you.
As I have updated my PC7s OS to Windows 10, I execute these commands and
have the same result as that on Windows 7.

Octave 4.0.2 on the Japanese version of Windows 10 freezes when the commnads
are executed, and the figure window is in no response.

Anonymous

 

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    Follow 3 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Wed 06 Jul 2016 07:17:52 PM UTCrik5Dependencies-=>bugs #46911 is dependent
    Mon 06 Jun 2016 04:35:22 PM UTCrik5StatusNone=>Confirmed
      Summarythe disappearnce of the plotted lines after "axis equal"=>the disappearance of the plotted lines after "axis equal"

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