lineOverlap does not recognize partially overlaps

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#2,580 opened on Feb 24, 2024 1 comment 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 45/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: typescript
Domain: api

Research direction

Start by reproducing the supplied GeoJSON example through the lineOverlap and booleanOverlap entry points, then inspect how they determine whether one segment is completely covered. Done means partial overlaps such as the shared green section are recognized by both functions, with the existing example still behaving correctly.

Written by the indexing model from the issue text.

Description

@turf/line-overlap

The lineOverlap function currently does not recognize when two lines partially overlap. This also affects booleanOverlap.

You can see it in this example:
The blue and red lines clearly overlap in the green area. However, this is not recognized because the implementation can currently only recognize an overlap if a segment is completely overlapping.

Example on geojson.io
Playground on jsfiddle
GeoJson:

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "stroke": "#0F0",
        "fill": "#0F0",
        "stroke-width": 25
      },
      "geometry": {
        "type": "LineString",
        "coordinates": [
          [120, -25],
          [150, -25]
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "stroke": "#F00",
        "fill": "#F00",
        "stroke-width": 10,
        "stroke-opacity": 1,
        "fill-opacity": 0.1
      },
      "geometry": {
        "type": "LineString",
        "coordinates": [
          [120, -25],
          [160, -25]
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "stroke": "#00F",
        "fill": "#00F",
        "stroke-width": 3,
        "stroke-opacity": 1,
        "fill-opacity": 0.1
      },
      "geometry": {
        "type": "LineString",
        "coordinates": [
          [110, -25],
          [150, -25]
        ]
      }
    }
  ]
}

Dominant language: TypeScript
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Forks: 1k
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Merged PRs (30d): 4

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