Re: [Gnuplot-info] rotation center

[Thomas S. <t.s...@fz...>]

seems that you are using gnuplot version 4.2.5
in versions >= 4.2.6 this bug has been corrected.


renzresearch wrote:
> 
> 
> 
> ---- Original message ----
>>Date: Sun, 13 Dec 2009 11:51:41 +0100
>>From: Hans-Bernhard Bröker <HBB...@t-...>  
>>Subject: Re: [Gnuplot-info] rotation center  
>>To: re...@uc...
>>Cc: gnu...@li...
>>
>>Zhong Ren wrote:
>>> Please consider the following script that draws a sphere.  Why
>>> the rotation center is not at the center of the sphere, when
>>> the graphics is spun by the mouse?
>>
>>Why should it be?  Did you really expect gnuplot to have a
> special rule 
>>like "whenever there is exactly one spherical surface among
> the plotted 
>>things, rotation will magically center around that"?
> 
> No, you didn't get my question.  Please consider my original
> case again:
> 
> Please consider the following script that draws a sphere.  Why
> the rotation center is not at the center of the sphere, when
> the graphics is spun by the mouse?  If I change to "set xrange
> [ 6 :  44]", the rotation center becomes the center of the
> sphere.  This makes the behavior of one of my large
> applications unpredictable.  Is there a way to specify the
> rotation center?  If not, how is the center selected by Gnuplot?
> 
> set terminal x11 0 size 1024,1024
> set parametric
> set view equal xyz
> set xlabel "x"
> set ylabel "y"
> set zlabel "z"
> set xrange [ 6 :  43]
> set yrange [80 : 118]
> set zrange [13 :  51]
> set pm3d implicit at s
> splot 10*cos(u)*cos(v)+25,10*cos(u)*sin(v)+99,10*sin(u)+33
> 
> The rotation center is indeed at the spherical center when
> xrange is [ 6 :  44], because (6+44)/2 = 25, which is exactly
> the spherical center.  When xrange is [ 6 :  43], the rotation
> center should be (6+43)/2 = 24.5, but it is not.  It is near
> x=33.  What makes Gnuplot to select the rotation center?
> 
>>
>>> If not, how is the center selected by Gnuplot?
>>
>>Mouse rotates the entire graph box, so, kind-of obviously, it is 
>>centered around the center of the graph box.  So if you want
> rotation to 
>>be around a particular point, make all three axis ranges
> symmetric 
>>around it:
>>
>>	set xrange [mid_x - size_x : mid_x + size_x]
>>	# likewise for y and z
>>
> 
> This is what I thought, but it is not working for me as the
> example I gave above.  Gnuplot seems to have a complex rule to
> select the rotation center.  I really prefer a user selected
> rotation center.
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