geoman-io/leaflet-geoman

The snap on edit mode is sometimes not perfect

Open

#715 opened on Dec 3, 2020

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 (7 comments) (0 reactions) (0 assignees)JavaScript (1,933 stars) (404 forks)batch import
good first issuehelp wantedneeds more info

Description

When I edit a polygon with a zoom level low and I snap this polygon to another one, it's very common the created snap point is not exactly on the line / point. For me, it's a problem regarding I control if these polygons are not intersecting.

Contributor guide

Tech stack
javascript
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
Basic knowledge of LeafletUnderstanding of snapping algorithms
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
Investigate the snapping logic in the leaflet geoman source code, likely in files like src/js/Edit/Snapping.js or similar. The issue mentions low zoom levels affecting precision; check coordinate rounding or snapping threshold calculations. Review comments #715 for any hints from maintainers. Look at how snap points are computed and compare them to the geometry coordinates.