[GRASS-dev] [bug #2793] (grass) v.segment: side offset is ignored
neteler at itc.it
Thu May 3 08:06:31 EDT 2007
On Thu, May 03, 2007 at 10:18:24PM +1200, Hamish wrote:
> > Markus Neteler via RT wrote:
> > > https://intevation.de/rt/webrt?serial_num=2793
> > >
> > > Apparently Vect_point_on_line() lacks support for side offset.
> > > Indeed, it doesn't even have such a parameter.
> > if we know the slope of the line at the point (angle*), it is easy
> > enough to calculate a point perpendicular to it (in the x,y plane)
> > offset by a certain distance with a little trig.
> > with luck the line direction is ok- shift off to the left or right?
> see attached patch. raw & completely untested. All I know is that it
Will do, thanks.
> > can anyone compose a nicer example for the v.segment help page?
> > (v.to.points -n or -v to get points?)
BTW: v.lrs.segment suffers from the same problem:
P <pid> <lid> <milepost>+<offset> [<side offset>]
L <sid> <lid> <milepost>+<offset> <milepost>+<offset> [<side offset>]
:) (hint hint)
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