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]>: > 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* > > > > _______________________________________________ > Qgis-developer mailing list > [email protected] > List info: http://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-developer >
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