strange error message for [X|Y|Z]TICK_GET when using Coyote library

[brandy125]

Can anybody check if this is a GDL problem or a Coyote library problem?

GDL> x=findgen(100) & y=x^2
GDL> cgzplot,x,y

gives the following error message:

CGPLOT--> PLOT: Internal GDL error for [X|Y|Z]TICK_GET, please report

[alaingdl]

I got exactly the same problem :(

[alaingdl]

plotting.cpp:2999: if (val == NULL) e->Throw("Internal GDL error for [X|Y|Z]TICK_GET, please report");

[alaingdl]

in fact this code code was working fine till circa 2023-11-02 and is not OK since 2023-11-14

unfortunately no tests related to that in the testsuite :(

[GillesDuvert]

@alaingdl you know it's difficult to test graphic functions, if somebody has an idea...

[alaingdl]

I have idea, I am finishing now a code to add some related tests in the testsuite (and is working fine)

But sorry @GillesDuvert , the changes are too large in Nov 2023 than I can track the bug in short time :(

[GillesDuvert]

Well, this is enough a test, and yes, TICK_GET got forgotten in the last changes I made to AXIS, PLOT etc.
Probably will be a one-liner, to be followed...

[GillesDuvert]

Absolutely NOT a one-liner, this thing!
Rather, yes, getting tick values (historically defined by plplot) back is/was just a matter of a few lines of code.
But, I realized that these values and the number of ticks was not at all correct.
In fact, there is an historical "AutoTick" function that gives a far approximation of the IDL "algorithm" to fix the number and values of tick intervals. I've found the correct algorithm, which is, once again, very clever and aesthetically pleasing, as IDL always did.
Implementation will follow.