logarithmic HScale widget

[Stefan Doehla <stefan power ele utoronto ca>]

Hi all!

I'm stuck in a little problem with my sliders ...
I'm writing a oscilloscope and need a slider with
values on a log-scale (or something similar).

The values are usually:

slider1:
0.00001, 0.00002, 0.00005, ... 50000, 100000

slider2:
1,2,5,10, ...,500

So I thought about 2 different solutions ...

Idea 1:
- use a normal slider with e.g. 36 integer values
  -> lookup in a table the corresponding values
- problem: the value above my slider has the integer values
  and it's not possible to set this value from outside ...

Idea 2:
- use the code of gtkhscale.h/c and modify it as my own widget
  -> #include "gtkloghscale.h", ...
  have a lookup table inside the widget ...
- problem here: compiles fine but I get the following error with 
gtk_log_hscale_new():
==
Gtk-WARNING **: gtk_widget_new(): could not find argument "adjustment" 
in the `GtkLogHScale' class ancestry

Gtk-WARNING **: invalid cast from (NULL) pointer to `GtkObject'

Gtk-CRITICAL **: file gtksignal.c: line 724 (gtk_signal_connect): 
assertion `object != NULL' failed.
==

I replaced nearly every (but static) occurence of hscale with 
log_hscale. I need no more the <gtkhscale.h> ...
What must I change to get rid of the nice message of gtk ...


Thanks for any help,
Stefan