combining identify() and locator()
awesome. Thank you very much for the quick response. I think this is exactly what I was looking for. -Brian
On Feb 27, 2009, at 1:10 AM, Barry Rowlingson wrote:
2009/2/27 Brian Bolt <bbolt at kalypsys.com>:
Hi, I am wondering if there might be a way to combine the two functions identify() and locator() such that if I use identify() and then click on a point outside the set tolerance, the x,y coordinates are returned as in locator(). Does anyone know of a way to do this? Thanks in advance for any help
Since "identify" will only return the indexes of selected points, and it only takes on-screen clicks for coordinates, you'll have to leverage "locator" and duplicate some of the "identify" work. So call locator(1), then compute the distancez to your points, and if any are below your tolerance mark them using text(), otherwise keep the coordinates of the click. You can use dist() to compute a distance matrix, but if you want to totally replicate identify's tolerance behaviour I think you'll have to convert from your data coordinates to device coordinates. The grconvertX and Y functions look like they'll do that for you. Okay, that's the flatpack delivered, I think you've got all the parts, some assembly required! Barry