Re: How to calculate X when dealing with truncate-lines non-nil.

[Eli Zaretskii]

> Date: Wed, 27 Sep 2017 20:16:11 -0700
> From: Keith David Bershatsky <address@hidden>
> 
> In developing my own feature requests to draw crosshairs (#17684) using 
> multiple fake cursors (#22873), I have reached a roadblock in understanding 
> why
> 
> move_it_to (&it, PT, it.last_visible_x, it.last_visible_y - 1, -1, 
> MOVE_TO_POS | MOVE_TO_X | MOVE_TO_Y);
> 
> is giving me an it.current_x of non-existent coordinates to the imaginary 
> right of the visible window when truncate-lines is non-nil.
> 
> For example, my screen is 1920 x 1080.  When PT is somewhere to the right of 
> the initial visible window, I'm getting X coordinates to a tune of 8,000 and 
> so forth.
> 
> How can I obtain the correct X, Y, HPOS, VPOS when dealing with a non-nil 
> truncate-lines situation?

You didn't show enough of your code to answer the question.  Please
show everything from the call to init_iterator or start_display to the
above call to move_it_to.