Re: Placing grid

["Dr. Roland Bock" <box2OO6 eudoxos de>]

Abdoulaye Walsimou Gaye wrote:
> Hello list,
> I want to place a grid line on every number in rulers created by
> gtk_databox_create_box_with_scrollbars_and_rulers().
> I know that I get those rulers by using gtk_databox_get_ruler_{x,y}()
> and then get lower, upper, position propeties by using
> gtk_databox_ruler_get_range(). But I think I don't have enough data to
> place my grid lines!
> How to know the space between each number in a ruler?
> In the current gtk-tutorial about rulers, they talk about 100 pixels
> between numbers (?), does this
> applies in case of GtkDataboxRuler? And if so, how to convert those
> value in pixels to a real double number in order
> to use gtk_databox_grid_array_new() to place my grid lines?

This 100 pixels between numbers rule given in the gtk-tutorial is not 
valid for GtkDataboxRuler (and I doubt that it is more than a rule of 
thumb for the gtk ruler).

I am afraid that basically you have to copy the algorithm of 
GtkDataboxRuler to your application in order to figure out how to place 
your grid lines.

An alternative might be to create your own ruler class: It inherits from 
GtkDataboxRuler but exports the positions/values of the ticks with numbers.


Hope that helps.


Regards,

Roland