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[Octave-bug-tracker] [bug #55574] axis equal truncates upper and lower p
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From: |
Rik |
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Subject: |
[Octave-bug-tracker] [bug #55574] axis equal truncates upper and lower parts of picture |
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Date: |
Fri, 25 Jan 2019 13:35:37 -0500 (EST) |
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User-agent: |
Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko |
Follow-up Comment #1, bug #55574 (project octave):
This issue keeps coming up in many different disguises. The fundamental issue
is that Octave clips (does not display) pixels in image objects which are
outside the axes. When 'axis equal' is issued it makes the linear distances
of the X and Y axes equal, but it has to do this by shortening one of the axes
because the original immage is 10x11.
Here is sample Octave session showing that.
octave:22> clf
octave:23> img = uint8 ([10: -1: 0] * 25)';
octave:24> size (img)
ans =
11 1
octave:25> imshow (pic)
octave:26> axis
ans =
0.50000 10.50000 0.50000 11.50000
octave:27> axis equal
octave:28> axis
ans =
0.50000 10.50000 2.05645 9.94355
octave:29> axis image
octave:30> axis
ans =
0.50000 10.50000 0.50000 11.50000
octave:31> diary off
octave:22> clf
octave:23> img = uint8 ([10: -1: 0] * 25)';
octave:24> size (img)
ans =
11 1
octave:25> imshow (pic)
octave:26> axis
ans =
0.50000 10.50000 0.50000 11.50000
octave:27> axis equal
octave:28> axis
ans =
0.50000 10.50000 2.05645 9.94355
octave:29> axis image
octave:30> axis
ans =
0.50000 10.50000 0.50000 11.50000
octave:31> diary off
octave:22> clf
octave:23> img = uint8 ([10: -1: 0] * 25)';
octave:24> size (img)
ans =
11 1
octave:25> imshow (pic)
octave:26> axis
ans =
0.50000 10.50000 0.50000 11.50000
octave:27> axis equal
octave:28> axis
ans =
0.50000 10.50000 2.05645 9.94355
octave:29> axis image
octave:30> axis
ans =
0.50000 10.50000 0.50000 11.50000
octave:31> diary off
octave:22> clf
octave:23> img = uint8 ([10: -1: 0] * 25)';
octave:24> size (img)
ans =
11 1
octave:25> imshow (pic)
octave:26> axis
ans =
0.50000 10.50000 0.50000 11.50000
octave:27> axis equal
octave:28> axis
ans =
0.50000 10.50000 2.05645 9.94355
octave:29> axis image
octave:30> axis
ans =
0.50000 10.50000 0.50000 11.50000
octave:31> diary off
octave:22> clf
octave:23> img = uint8 ([10: -1: 0] * 25)';
octave:24> size (img)
ans =
11 1
octave:25> imshow (pic)
octave:26> axis
ans =
0.50000 10.50000 0.50000 11.50000
octave:27> axis equal
octave:28> axis
ans =
0.50000 10.50000 2.05645 9.94355
octave:29> axis image
octave:30> axis
ans =
0.50000 10.50000 0.50000 11.50000
octave:31> diary off
The quick solution is that you want 'axis image', i.e., "tight" + "equal" to
properly display an image object.
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