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Can anyone think of a better way of doing this?
This is a discussion on Can anyone think of a better way of doing this? within the MapPoint 2006/2009 Discussion forums, part of the Map Forums category; Hi All, I have a map with shed-loads of shapes (polygons) - could be up to 1000. I have one ...
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11-10-2007
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| Can anyone think of a better way of doing this? I have a map with shed-loads of shapes (polygons) - could be up to 1000. I have one location. I need to find which of the shapes (if any) my location is 'in'. Currently, what I do is to add a pushpin (at my location) to the ActiveMap, then, using the DataSet, iterate through the shapes and see if the location is in each shape - using DataSet.QueryShape(Shape). This can be quite time-consuming so can anyone think of a quicker way? Many thanks...
__________________ John Lewis         |
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11-12-2007
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| Re: Can anyone think of a better way of doing this?
As you're loading the shapes, keep track of the bounding-rectangle corners (ULC,LRC) for each shape. Then you can easily determine if a location falls within the bounding rectangle and limit your results to test for point-in-polygon only on those shapes. Of note - If your shapes are coming from an ESRI .SHP file, the bounding corners are already computed for you. -Paul |
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