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Re: Cursor position on images

  • To: mathgroup at smc.vnet.net
  • Subject: [mg129303] Re: Cursor position on images
  • From: spamslayer19 at gmail.com
  • Date: Sun, 30 Dec 2012 20:49:49 -0500 (EST)
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And of course define ptsList = {}; before anything else. I left out the most important part!

On Saturday, December 29, 2012 9:24:56 PM UTC-6, spamsl... at gmail.com wrote:
> On Saturday, December 29, 2012 2:08:29 PM UTC-6, King, Peter R wrote:
>
> > I am sure this is straightforward but I cannot quite see how to do this
>
> I have an image (jpg file, but could be any format if that matters). I want
>
>  to be able to left click on the image and mark the point with a dot of some sort and collect the coordinates of the point (the coordinate system is
 fairly arbitrary). I then want to be able to repeat this as many times as required and end up with a list of the coordinates of the points clicked on for further manipulation. Clickpane should do the trick but I can't work out how.
>
> >
>
> >
>
> >
>
> > Any suggestions, thanks.
>
> >
>
> >
>
> >
>
> > Peter
>
>
>
> Try this:
>
>
>
> image = ExampleData[{"TestImage", "Girl3"}];
>
> ptColor = Yellow;
>
> ptSize = Large;
>
> Panel@Grid[
>
>   {
>
>    {
>
>     Dynamic@ClickPane[
>
>       Show[
>
>        {
>
>         image, Graphics[{PointSize[ptSize], ptColor, Point[ptsList]}]
>
>         }
>
>        ],
>
>       AppendTo[ptsList, #] &], SpanFromLeft
>
>     },
>
>    {
>
>     PopupWindow[Button["View Points", ImageSize -> 100],
>
>      Dynamic@ptsList], SpanFromLeft
>
>     },
>
>    {
>
>     Button["Reset", ptsList = {}, ImageSize -> 100], SpanFromLeft
>
>     }
>
>    },
>
>   Alignment -> {Right, Baseline}
>
>   ]
>
>
>
> If you don't like the popup window, you can just evaluate Dynamic@ptsList in a separate cell. I'm sure someone has a more elegant solution, but this works. :)



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