Re: [Gnuplot-info] rotation center

[Hans-Bernhard B. <HBB...@t-...>]

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"?

> 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