[GRASS5] embedding GRASS display into my app

[David Piasecki]

Do you know of a way to convert the pixel coordinates of the PNG image 
into geo coordinates? I imagine d.where won't work since it's only 
interactive within the grass program itself.

David



On Apr 7, 2004, at 10:47 PM, Glynn Clements wrote:
>
> Yes; since adding that option to the PNG driver, I've found that for
> typical image sizes (e.g. 800x600x24bpp), the compression time isn't
> really significant (on a P3/800).
>
> For large vector files, I suspect that the biggest gains would come
> from:
>
> 1. Calling the system's drawing functions (XDrawLine, gdk_draw_line
> etc) directly from your application.
>
> 2. Only drawing the sections of the map which need to be redrawn, i.e.
> the bounding rectangle of anything which may have changed.
>
> OTOH, if using e.g. d.vect plus XDRIVER/PNGdriver is adequate, writing
> system("d.vect ...") is a lot less code than re-implementing it.
>
> -- 
> Glynn Clements <glynn.clements at virgin.net>