Re: Rotating pixmap

[Marco Quezada <mquezada nlxcorp com>]

Thanks all for your input.

Well, unfortunately I can't animate it before hand because the arrow's heading
must be updated in realtime as the user flies a simulated aircraft.

I was thinking about drawing it as just a couple of lines. I figured the
easiest way to do this was to define a set of points and use gdk_draw_polygon
but I have been unsuccesful with it. Does anyone have or know of an example on
using this function? How must the *points argument be declared? is it an array?

Thanks.

Mihai BAZON wrote:

> You can use ImageMagick (www.imagemagick.org) -- highly portable, can do
> many transformations on a bitmap, knows many file formats, etc.
>
> However, I think it's too much to require users of your program to have
> imagemagick installed, only for this problem.  If your animation does
> not depend on user (i.e. you already know that it will spin like a
> compass) -- why not render it before, and when the program runs only
> draw it (avoid useless computations)?
>
> Cheers,
>
> /*   -*- Mishoo -*-         In the beginning there was nothing,
>  *  mishoo websci ro      which exploded.   (The Big Bang Theory)  */
>
> On 10 May 2001, Havoc Pennington wrote:
>
> > Marco Quezada <mquezada nlxcorp com> writes:
> > > I have a defined a draing area inside which I display a small icon (an
> > > arrow). The icon is a pixmap which gets loaded with
> > > gdk_pixmap_create_from_xpm_d and such. The XPM of the arrow shows the
> > > arrow pointing to the right. I would like to show the arrow rotating
> > > like a compass. Is it possible to rotate the pixmap when drawing it onto
> > > the drawing area?
> >
> > No. (That is, GTK provides no way. You can write your own code, but
> > it's not trivial.)
> >
> > Havoc
> >
> > _______________________________________________
> > gtk-app-devel-list mailing list
> > gtk-app-devel-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list

--
Marco Quezada
Aerospaceo Engineero
NLX Corporation
22626 Sally Ride Dr.
Sterling, VA, 20164
mquezada nlxcorp com
703-234-2100 x1028
http://www.nlxcorp.com