Bug report #14531

QgsGeometry::touches returning false on touching lines

Added by Maximilian Krambach about 8 years ago. Updated about 5 years ago.

Status:Closed
Priority:Normal
Assignee:-
Category:Python plugins
Affected QGIS version:2.14.0 Regression?:No
Operating System: Easy fix?:No
Pull Request or Patch supplied:No Resolution:end of life
Crashes QGIS or corrupts data:No Copied to github as #:22504

Description

When I have an intersection, I can test for intersect and then get the intersection. It would be nice to have a similar function for touch (one geometry's vertex is on other's geometry's line), which returns a point if the two lines do touch.
The function QgsGeometry::touches seems to have the issue that it only returns True if the touching point is on a vertex of both lines.

Here python code for what I'm thinking of:

def touchesWhere(self, lineA, lineB):
    if lineA[0].onSegment(lineB[0],lineB[1]) == 2:
        return lineA[0]
    elif lineA[1].onSegment(lineB[0],lineB[1]) == 2:
        return lineA[1]
    return False

History

#1 Updated by Giovanni Manghi almost 7 years ago

  • Easy fix? set to No
  • Regression? set to No

#2 Updated by Giovanni Manghi about 5 years ago

  • Resolution set to end of life
  • Status changed from Open to Closed

End of life notice: QGIS 2.18 LTR

Source:
http://blog.qgis.org/2019/03/09/end-of-life-notice-qgis-2-18-ltr/

QGIS 3.4 has recently become our new Long Term Release (LTR) version. This is a major step in our history – a long term release version based on the massive updates, library upgrades and improvements that we carried out in the course of the 2.x to 3x upgrade cycle.

We strongly encourage all users who are currently using QGIS 2.18 LTR as their preferred QGIS release to migrate to QGIS 3.4. This new LTR version will receive regular bugfixes for at least one year. It also includes hundreds of new functions, usability improvements, bugfixes, and other goodies. See the relevant changelogs for a good sampling of all the new features that have gone into version 3.4

Most plugins have been either migrated or incorporated into the core QGIS code base.

We strongly discourage the continued use of QGIS 2.18 LTR as it is now officially unsupported, which means we’ll not provide any bug fix releases for it.

You should also note that we intend to close all bug tickets referring to the now obsolete LTR version. Original reporters will receive a notification of the ticket closure and are encouraged to check whether the issue persists in the new LTR, in which case they should reopen the ticket.

If you would like to better understand the QGIS release roadmap, check out our roadmap page! It outlines the schedule for upcoming releases and will help you plan your deployment of QGIS into an operational environment.

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