RE: Fun with arrows

["Young, Robert" <Robert Young dsto defence gov au>]

Lars,

Are you able to integrate this with the code that Richard Rowell proposed
(see 1 Feb 2002, subject: Dynamic Arrows)?? Or, Richard, if you are out
there, can you integrate with Lars' code??

All looks very nice from where I sit.

Regards,
Rob.

> -----Original Message-----
> From: Lars Clausen [mailto:lrclause@cs.uiuc.edu]
> Sent: Friday, 5 April 2002 9:34 AM
> To: dia-list@gnome.org
> Subject: Fun with arrows
> 
> 
> 
> Following Cyrille's suggestion, I tried making a better arrow 
> selection
> menu.  What I came up with can be seen at
> <URL:http://shasta.cs.uiuc.edu/~lrclause/Dia/newarrows.png>.  
> The reason
> I'm using 1-pixel lines is that with 2-pixel lines, the stem 
> is off-center,
> and with 3-pixel lines, you can't tell the three 
> circle-with-slash arrows
> from each other.  You'll notice that any defects in the arrow 
> drawing is
> highly visible here (for instance the integral line obviously has a
> blanked-out area).  Hopefully that will force us to improve 
> the arrows:)
> 
> Details: I made this by adding a new renderer, RenderPixmap.  
> It allows
> rendering directly onto a pixmap, with a 1-1 translation of 
> sizes.  Thus I
> can use the arrow drawing code directly to draw these.  This 
> shrinks the
> dia_arrow_preview_expose function from 404 lines to about 30. 
>  I should be
> able to do the same for the arrowhead property widget, though 
> that won't
> save code.  I shall also be adding tooltips, I think.
> 
> Any objections to this?
> 
> And finally, a debugging hint:  I got in the situation where I need to
> debug the drawing of a menu.  Now X (or Gtk or someone) 
> doesn't allow you
> to change window while a menu window is open, so when gdb 
> stopped while the
> arrow menu was up, I couldn't do anything... except change to 
> the console.
> So, I run gdb in 'screen' instead, when I am stuck in a menu, 
> I change to
> the console and go 'screen -d -r'.  Voila, gdb session in console.
> 
> -Lars
> 
> -- 
> Lars Clausen (http://shasta.cs.uiuc.edu/~lrclause)| Hårdgrim 
> of Numenor
> "I do not agree with a word that you say, but I   
> |----------------------------
> will defend to the death your right to say it."   | Where are 
> we going, and
>     --Evelyn Beatrice Hall paraphrasing Voltaire  | what's 
> with the handbasket?
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