[Octave-bug-tracker] [bug #31305] slow contour plot

[Ben Abbott]

Follow-up Comment #29, bug #31305 (project octave):

Forgot to follow up on the printing. With the tip at 11168 and David's
patch.contour4 patch applied, I'm able to print the contours as well.

Also, while "axis tight" results in a blank window with axis limits [1 20 1
20], using "xlim([1 20]); ylim([1 20])" gives the proper result.

I experimented with how axis() sets the limits for the "tight" option. If I
modify axis:__do_tight_option__ as ...

function __do_tight_option__ (ca)
set (ca,
     "xlim", __get_tight_lims__ (ca, "x"),
     "ylim", __get_tight_lims__ (ca, "y"))
# set (ca,
#      "xlim", __get_tight_lims__ (ca, "x"),
#      "ylim", __get_tight_lims__ (ca, "y"),
#      "zlim", __get_tight_lims__ (ca, "z"));
endfunction

Then "contour(peaks(20))" gives the correct result.

Changing to ...

function __do_tight_option__ (ca)
zlim_orig = get (ca, "zlim")
zlim_tight = __get_tight_lims__ (ca, "z")
set (ca,
     "xlim", __get_tight_lims__ (ca, "x"),
     "ylim", __get_tight_lims__ (ca, "y"),
     "zlim", __get_tight_lims__ (ca, "z"))
endfunction

Then when I call "contour(rand(20))", I see a blank axis box and the debug
lines give ...

    zlim_orig =   0   1
    zlim_tight =   0.0047762   0.9994125

If I follow up with "zlim([0 1])", then I see the correct result.


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