[GRASS-user] Rotate a map display

[Cuinet Jérôme]

Markus,

I have seen the cairo.Matrix.rotate() documentation, and it is juste a
constructor of matrix, not very useful ;)

Also, if I quit the GIS context, I must produce at least a twice larger
image, and cut the border in oder to have a wholly image.

As I wrote in my former mail, I can choose an other software. I have seen
MapServer which is able to rotate my map view. Finally, I think MapServer is
better for my needs.


Jérôme

----- Original Message ----- 
From: "Markus Neteler" <neteler at osgeo.org>
To: "Vincent Bain" <bain at toraval.fr>
Cc: "Jérôme - GeoRezo.net" <jerome at georezo.net>; "GRASS user list"
<grass-user at lists.osgeo.org>
Sent: Wednesday, April 15, 2009 9:09 PM
Subject: Re: [GRASS-user] Rotate a map display


On Wed, Apr 15, 2009 at 7:28 PM, Vincent Bain <bain at toraval.fr> wrote:
> Jérôme,
>
> If you need to warp a map for a strict display purpose, IMHO it's not to
> be performed from within grass given that this operation makes no sense
> "geographically". Don't know what the context is, but if you just have
> to rotate an image output of a map maybe you'd better look towards image
> manipulation tools (e.g. imagemagick and the -rotate option, which can
> easily be integrated in a script process).

Perhaps you can use the CAIRO driver.
In CAIRO, I see cairo.Matrix.rotate()
http://cairographics.org/documentation/cairomm/reference/classCairo_1_1Matrix.html

Just an untested idea, I am not familiar with the CAIRO driver in GRASS.

Markus