[GRASS5] [bug #1895] (grass) d.pan: sets new region by raster grid resolution

[Radim Blazek]

d.zoom -f can also pan.

Radim

On Friday 23 May 2003 14:23, Request Tracker wrote:
> this bug's URL: http://intevation.de/rt/webrt?serial_num=1895
> -------------------------------------------------------------------------
>
> Subject: d.pan: sets new region by raster grid resolution
>
> Platform: GNU/Linux/i386
> grass obtained from: Trento Italy site
> grass binary for platform: Compiled from Sources
> GRASS Version: 5.0.2
>
> I don't know if this is an intended feature or a bug, but:
>
> While working with a mapset that consists of fine scale vectors and points
> only, with the (unused) region resolution set to fairly coarse...
>
> Next, zoom in on a feature.
>
> d.pan will only reposition along the raster grid, not on the mouse click.
> (in my case this was a clicking around and nothing happens, until you get
> to the edge of the screen, when it would jump a lot)
>
> clicking the middle mouse button for position shows this behaviour as well.
>
>
> maybe the module shouldn't be so raster-centric? especially for 5.1 ..
> If the resolution was greater than the region, d.pan might appear to 'fail'
> for no reason.
>
> I was working in Lat/Lon, fwtw
>
>
> e.g.
> src/display/d.pan/center.c:
>
> 	screen_y = (int) D_u_to_d_row (north);
> 	screen_x = (int) D_u_to_d_col (east);
>
> 	t = (window->north - north) / window->ns_res;
> 	north = window->north - (t+.5) * window->ns_res;
>
> 	t = (window->east - east) / window->ew_res;
> 	east = window->east - (t+.5) * window->ew_res;
>
>
>
> comments?
>
>
> Hamish