MapWindow 4 - ActiveX Control Programming : MapWindow Discussion Forum
Need help on how to determine if a point is inside/intersects with a polygon. Just determine if it's "true" or "false"...
Determine if a point is inside a polygon...
Posted by:
dominic02 ()
Date: February 22, 2011 01:16AM
Need help on how to determine if a point is inside/intersects with a polygon. Just determine if it's "true" or "false"...
Re: Determine if a point is inside a polygon...
Posted by:
sindizzy ()
Date: February 23, 2011 12:19AM
Have you tried the geoprocessing library?
AGP
AGP
Re: Determine if a point is inside a polygon...
Posted by:
dominic02 ()
Date: February 24, 2011 07:53PM
I haven't checked but I found that comparing extents seems to work fine too. I just compare the extents of the polygon and the point I wanted. I found that with the MapWinGIS Reference Guide
Edited 1 time(s). Last edit at 02/24/2011 07:56PM by dominic02.
Edited 1 time(s). Last edit at 02/24/2011 07:56PM by dominic02.
Re: Determine if a point is inside a polygon...
Posted by:
sindizzy ()
Date: February 26, 2011 08:02AM
That may not always work. imagine a polygon in the shape of a "C" and your point is in the middle. the extents of the "C" are larger than the extents of the point so your algorithm would return true when in reality the point is not inside the polygon.
AGP
AGP
Re: Determine if a point is inside a polygon...
Posted by:
nmb100 ()
Date: March 02, 2011 03:13AM
Hi
Why not use the shape1.intersects(shape2) function, which results in a boolean response? This will allow you to determine if the point is inside or not.
Hope this helps.
Cheers,
Nigel
Why not use the shape1.intersects(shape2) function, which results in a boolean response? This will allow you to determine if the point is inside or not.
Hope this helps.
Cheers,
Nigel
Re: Determine if a point is inside a polygon...
Posted by:
dominic02 ()
Date: March 04, 2011 10:57PM
To sindizzy and Sir Nigel:
Sorry for the late reply. You were right and saved me a ton of trouble: I almost presented my work to the boss and scheduled a demo! Thank You.
It's fun working on this geoprocessing stuff, though I'm still a noob at it, even with two months experience...
Edited 1 time(s). Last edit at 03/04/2011 10:58PM by dominic02.
Sorry for the late reply. You were right and saved me a ton of trouble: I almost presented my work to the boss and scheduled a demo! Thank You.
It's fun working on this geoprocessing stuff, though I'm still a noob at it, even with two months experience...
Edited 1 time(s). Last edit at 03/04/2011 10:58PM by dominic02.
Re: Determine if a point is inside a polygon...
Posted by:
nmb100 ()
Date: March 16, 2011 07:26AM
Hi Dominic
No problem at all. I am often struggling with how to do things and more often than not, someone has had a similar problem. The forums here are great and have knowledgable people assisting. Paul and Sergei are great.
Nigel
No problem at all. I am often struggling with how to do things and more often than not, someone has had a similar problem. The forums here are great and have knowledgable people assisting. Paul and Sergei are great.
Nigel
Re: Determine if a point is inside a polygon...
Posted by:
dominic02 ()
Date: March 30, 2011 01:36AM
To Sir Nigel
Hi, again. I just want to ask if there is any other way to do this?
Hi, again. I just want to ask if there is any other way to do this?
Re: Determine if a point is inside a polygon...
Posted by:
bmarch ()
Date: April 28, 2011 11:03AM
Hi Dominic,
You can also use:
MapWinGeoProc.Utils.PointInPolygon(...)
Brian M.
You can also use:
MapWinGeoProc.Utils.PointInPolygon(...)
Brian M.
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