how to submit a ROI defined by dBox?

[Eduardo Patto Kanegae]

Kudos!

Thanks a lot, Steve.

It´s working:

http://www.webmapit.com.br/downloads/area_drawing.png - during drawing
http://www.webmapit.com.br/downloads/area_submited.png - after
submiting and as feature objects.

Eduardo

On 3/16/07, Steve Lime <Steve.Lime at dnr.state.mn.us> wrote:
> Hi Eduardo: This is possible once you know how. The coordinates from drawing are held in two
> arrays in the dBox object, called x and y. They are held in screen coordinates and need to be
> converted to image and then map coordinates before being used. I'll make this more transparent
> in the future. Anyhow, you'd do this with code like this:
>
>   for (var i=0; i<myDbox.x; i++) {
>     img_x[i] = myDbox.x[i] - myDbox.offsetx; // convert from screen to image coordinates
>     img_y[i] = myDbox.y[i] - myDbox.offsety;
>     map_x[i] = myDbox.extent[0] + img_x[i]* myDbox.cellsize; // convert from image to map coordinates
>     map_y[i] = myDbox.extent[3] - img_y[i]* myDbox.cellsize;
>   }
>
> Dbox's polygon drawing does not make the first coordinate the same as the last so you'll have to
> do that yourself. Hope this helps.
>
> Steve
>
> >>> On 3/14/2007 at 9:38 AM, in message
> <2d1782780703140738m3ca79487y3ce9436665cf4d5e at mail.gmail.com>, Eduardo Patto
> Kanegae <epk.lists at GMAIL.COM> wrote:
> > Hi folks,
> >
> > I'm using dBox as my MapServer CGI front end and have enabled draw area
> > tool.
> >
> > Now I'd like to submit the points defined by area tool and then save
> > the area as a polygon inside a PostGIS database.
> >
> > Have someone done something similar? How does dBox handle this area?
> > As image coordinates? Or as UTM coordinates?
> >
> > best
>
>


-- 
Eduardo Patto Kanegae