Re: [R] clicking on plot and recording XY coords

From: milton ruser <milton.ruser_at_gmail.com>
Date: Sat, 21 Jun 2008 01:17:32 -0300

Jim,

In fact, if I click "stop" the for() looping and stop, and I need to continue on the for().
By other side, is there a way of I ask for the user "acquire point" (with a dialog box with Yes or No options), and if the user anwer Yes I collect the points, otherwise I go for the next step of for() looping?

sorry for do it so trouble.
Kind regards

miltinho

On 6/21/08, jim holtman <jholtman_at_gmail.com> wrote:
>
> I am not sure how you would record a NULL. I assume that if you click
> 'stop', then the result returned is a NULL and you can test for that.
> Once you start collecting points, you should not have a NULL in the
> series.
>
> On Fri, Jun 20, 2008 at 11:56 PM, milton ruser <milton.ruser_at_gmail.com>
> wrote:
> > Thanks Jim.
> >
> > I included your suggestion on the script and run fine.
> > But how can I skip (record X and Y as NULL) on some steps?
> > On this example it donīt occour, but when working with real data I will
> need
> > bypass some acquisitions. Is there a way of do it on a for() looping? I
> > noticed that if I click on right button of mouse the locator() ask for
> > continue or stop. But some times I just want to record NULL for the
> > position.
> >
> > Thanks a lot,
> >
> > Miltinho
> > ============
> >
> > number.clicks<-4
> > my.coords<-NULL
> >
> > for (i in 1:number.clicks)
> > {
> > plot(0,0, type="n")
> > seg1<-arrows(-0.5,-1,0.5,0, col=1)
> > seg2<-arrows(0,-1,-0.3,0.3, col=2)
> > seg3<-arrows(0.2,-0.7,-0.5,0, col=4)
> >
> > coord<-locator(1, type="p")
> > my.coords<-rbind(my.coords, cbind(x=coord$x, y=coord$y))
> > }
> >
> > my.coords
> >
> >
>
>
>
> --
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
>
> What is the problem you are trying to solve?
>

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