Thanks for that link. That's the direction I'm headed.
I posted here to find out if this is an error in the python
implementation or documentation and see if I should submit an issue.
*Worth Lutz*
On 5/6/2016 8:15 AM, Caio Hamamura wrote:
I've already used this function and it returned exactly the same you
claim to receive. But you can calculate the position yourself, it is
actually simple. Check it out:
http://stackoverflow.com/a/1560510/2548351
2016-05-05 13:25 GMT-03:00 Worth Lutz <[email protected]
<mailto:[email protected]>>:
I'm trying to use "closestSegmentWithContext" method of
QgsGeometry in a plugin. I don't seem to be getting what I'm
expecting.
Comparing
http://qgis.org/api/classQgsGeometry.html#ac09505a6a8a29f244a37c6f336cd98e7
with the following from:
https://github.com/qgis/QGIS/blob/master/python/core/geometry/qgsgeometry.sip
/**
* Searches for the closest segment of geometry to the given point
* @param point Specifies the point for search
* @param minDistPoint Receives the nearest point on the segment
* @param afterVertex Receives index of the vertex after the
closest segment. The vertex
* before the closest segment is always afterVertex - 1
* @param leftOf Out: Returns if the point lies on the left of
right side of the segment ( < 0 means left, > 0 means right )
* @param epsilon epsilon for segment snapping (added in 1.8)
* @return The squared cartesian distance is also returned in
sqrDist, negative number on error
*/
double closestSegmentWithContext( const QgsPoint& point,
QgsPoint& minDistPoint /Out/, int& afterVertex /Out/ ) const;
When I try:
results =
self.selectedStreetSegment.geometry().closestSegmentWithContext(point)
I get a results as:
(2560.365846544, (2106395, 746610), 1)
I take this to be (sqrDist, minDistPoint, afterVertex ). It does
not seem to be returning "leftOf" which is the value I'm looking for.
Is something missing in that "sip" definition? I do not know what
I'm looking at so I may be looking at the wrong thing. In any
case, I cannot seem to find the results I need.
Thanks,
--
*Worth Lutz*
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