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[Octave-bug-tracker] [bug #37933] quiver3 arrow heads disappear as dx an
From: |
anonymous |
Subject: |
[Octave-bug-tracker] [bug #37933] quiver3 arrow heads disappear as dx and dy go to zero |
Date: |
Sun, 16 Dec 2012 02:54:11 +0000 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.57.2 (KHTML, like Gecko) Version/5.1.7 Safari/534.57.2 |
URL:
<http://savannah.gnu.org/bugs/?37933>
Summary: quiver3 arrow heads disappear as dx and dy go to
zero
Project: GNU Octave
Submitted by: None
Submitted on: Sun 16 Dec 2012 02:54:09 AM UTC
Category: Plotting
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Incorrect Result
Status: None
Assigned to: None
Originator Name: Ted Rippert
Originator Email: address@hidden
Open/Closed: Open
Discussion Lock: Any
Release: 3.6.3
Operating System: Mac OS
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Details:
To see the issue, use this command:
octave:42> quiver3(0,0,0,0,0,1)
octave:43> hold on
octave:44> quiver3(0,0,0,0,1,0)
octave:45> quiver3(0,0,0,1,0,0)
The horizontal arrows have arrow heads, but not the vertical arrow. Actually
the head is there, but the two lines that make it up are parallel to the body
line. It turns out that the angle between the arrow head lines is proportional
to the length of the arrow in the x-y plane, so an arrow with length only
along the z-axis appears to have no head.
I have a fix. Replace line 219 in __quiver__.m:
zarrw1 = zarrw2 = zend - ww(:) * arrowsize;
with
xarrw1 = xtmp + sqrt((y - yend).^2 + (z - zend).^2) * arrowsize / 3;
xarrw2 = xtmp - sqrt((y - yend).^2 + (z - zend).^2) * arrowsize / 3;
yarrw1 = ytmp - sqrt((x - xend).^2 + (z - zend).^2) * arrowsize / 3;
yarrw2 = ytmp + sqrt((x - xend).^2 + (z - zend).^2) * arrowsize / 3;
zarrw1 = zarrw2 = zend - ww(:) * arrowsize;
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?37933>
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- [Octave-bug-tracker] [bug #37933] quiver3 arrow heads disappear as dx and dy go to zero,
anonymous <=