Re: mouse pan and zoom

[Ethan M. <merritt@u.washington.edu>]

On Thursday 23 July 2009 19:12:56 James R. Van Zandt wrote:
> 

> I revised plot3d.c to fix the X and Y limits before checking for valid
> Z values:
> 
>     axis_checked_extend_empty_range(FIRST_X_AXIS, "All points x value undefined");
>     axis_revert_and_unlog_range(FIRST_X_AXIS);
>     axis_checked_extend_empty_range(FIRST_Y_AXIS, "All points y value undefined");
>     axis_revert_and_unlog_range(FIRST_Y_AXIS);
>     if (splot_map)
> 	axis_checked_extend_empty_range(FIRST_Z_AXIS, NULL); /* Suppress warning message */
>     else
> 	axis_checked_extend_empty_range(FIRST_Z_AXIS, "All points z value undefined");
> 
>     axis_revert_and_unlog_range(FIRST_Z_AXIS);
> 
> It works here.  However, I'd appreciate someone with a better
> understanding of the code checking for side effects.
> 
> 	   - Jim Van Zandt

I don't know if it counts as a side-effect, but after setting

   set view equal xyz

the 3D zoom behavior (control + mouse wheel) is unexpected.
I would have expected the whole plot to get bigger or smaller;
instead the x/y area remains fixed, the x and y scales change,
and the z axis grows correspondingly longer or shorter.

Note:  since 'set view equal xyz' doesn't work in the x11 terminal anyhow,
you would need to use the wxt or maybe qt terminal to see what I'm describing. 

	Ethan Merritt