How to use @turf/line-slice-along - 7 common examples

To help you get started, we’ve selected a few @turf/line-slice-along examples, based on popular ways it is used in public projects.

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github ibi-group / datatools-ui / lib / editor / actions / map / stopStrategies.js View on Github external
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    const newLineSegment = lineString(newShape)
    const distanceAdded = lineDistance(newLineSegment, 'meters')
    const newPatternSegments = [...patternSegments]
    if (splitInterval > 0) {
      // If split interval is provided (e.g., to add stops at intervals along
      // new segment), split new line segment and add temp control points (later
      // to be assigned stop IDs).
      const numIntervals = Math.floor(distanceAdded / splitInterval)
      let previousDistance = 0
      // Iterate over intervals and store positions for constructing stops
      for (let i = 1; i <= numIntervals; i++) {
        const splitDistance = (i * splitInterval)
        // Default unit for lineSliceAlong is km (meters not supported).
        // console.log(`slicing line from ${previousDistance} m to ${splitDistance} m.`, newLineSegment)
        const slicedSegment = lineSliceAlong(newLineSegment, previousDistance / 1000, splitDistance / 1000)
        const newCoords = slicedSegment.geometry.coordinates
        // Push new coordinates to updated pattern segments
        newPatternSegments.push(newCoords)
        // Add stops along new line segment at distance (initial dist +
        // stopInterval)
        const endPoint = point(newCoords[newCoords.length - 1])
        const controlPoint = {
          id: generateUID(),
          point: endPoint,
          // If control points are to become stops, point type and stop ID must
          // be added later (e.g., in addStopAtInterval).
          pointType: POINT_TYPE.ANCHOR,
          distance: initialDistance + splitDistance
        }
        // $FlowFixMe
        clonedControlPoints.push(controlPoint)
github ibi-group / datatools-ui / lib / editor / selectors / index.js View on Github external
// FIXME this is breaking stuff when the remaining line has only one coordinate!!!
          // console.log(`remaining line dist = ${remainingLineDistance}`, remainingLine, scaledDistanceInMeters / 1000)
          if (scaledDistanceInMeters === remainingLineDistance) {
            // This should only be the case with the last stop
            // console.log(`pattern stop ${i}/${patternStops.length} distance is equal to remaining lint distance, setting to end of shape`)
            // FIXME: what if this happens not on the last pattern stop
            insertPoint = pointAtLastCoordinate(remainingLine)
            insertIndex = shapePointsCopy.length - 1
            distance = remainingLineDistance
            itemsToDelete = 1
          } else {
            // This should be the case for all but first and last stops
            distance = scaledDistanceInMeters
            // Use the pattern line to find the lat/lng to use for the generated
            // shape point.
            const lineSegment = lineSliceAlong(
              patternLine,
              0,
              scaledDistanceInMeters / 1000
            )
            insertPoint = pointAtLastCoordinate(lineSegment)
            // Insert generated shape point in the correct location according to
            // its distance along the line.
            insertIndex = shapePointsCopy.findIndex(
              sp => sp.shapeDistTraveled > distance
            )
            itemsToDelete = 0
          }
        }
      }
    }
    // Insert projected stop into shape points list
github ibi-group / datatools-ui / lib / editor / selectors / index.js View on Github external
// points
          const sliceDistance = (distance - previousDistance) / 1000
          let lineSegment
          // console.log(remainingLine, sliceDistance, stopControlPoints[i])
          if (sliceDistance <= 0 || isNaN(sliceDistance)) {
            console.warn(`Slice distance for pattern stop index=${i} is ${sliceDistance} (${distance} = ${previousDistance} * scale ${distScaleFactor}). Reverting to straight line.`)
            // If there is no more line segment left, extend line to stop control
            // point and TODO signal warning to user?
            const {coordinates} = remainingLine.geometry
            lineSegment = lineString([
              coordinates[coordinates.length - 1],
              [stopControlPoints[i].shapePtLon, stopControlPoints[i].shapePtLat]
            ])
          } else {
            // Otherwise, slice line at specified distance.
            lineSegment = lineSliceAlong(remainingLine, 0, sliceDistance)
            if (!lineSegment) {
              console.warn(`Could not slice remaining line segment at index=${i}`)
            }
            const endOfLine = lineDistance(remainingLine, 'kilometers')
            if (sliceDistance >= endOfLine) {
              // Do not attempt to slice line if the distance parameters are not
              // correctly aligned. This seems to sometimes happen perhaps due to
              // rounding errors on the final pattern stop.
              console.warn(`Slice begin distance (${sliceDistance} km) is greater than or equal to end distance (${endOfLine} km). Cannot slice.`)
            } else {
              try {
                remainingLine = lineSliceAlong(
                  remainingLine,
                  sliceDistance,
                  endOfLine
                )
github ibi-group / datatools-ui / lib / editor / selectors / index.js View on Github external
if (sliceDistance <= 0 || isNaN(sliceDistance)) {
        // If slice distance is zero or negative, coerce to one meter.
        // Prepare geometries for debugging.
        // patternLine.properties.stroke = randomColor()
        const features = featurecollection([
          patternLine,
          remainingLine,
          insertPoint,
          point([stop.stop_lon, stop.stop_lat])
        ])
        console.warn(`Slice distance for pattern stop index=${i} is ${sliceDistance} (${distance} - ${previousDistance}), setting to 1 meter
        http://geojson.io/#data=data:application/json,${encodeURIComponent(JSON.stringify(features))}`, patternStop)
        sliceDistance = 1 / 1000 // set slice distance to 1 meter if negative or zero
      }
      // console.log(`slicing line at ${sliceDistance} km`, remainingLine)
      const lineSegment = lineSliceAlong(remainingLine, 0, sliceDistance)
      const totalLength = lineDistance(remainingLine)
      // console.log(`slice #${i}/${patternStops.length - 1}`, lineSegment)
      if (i < patternStops.length - 1) {
        // Compute remaining line segment (only if not working on the final stop)
        try {
          remainingLine = lineSliceAlong(
            remainingLine,
            sliceDistance,
            totalLength
          )
        } catch (err) {
          console.warn(`Could not slice line for stop index=${i} (at ${sliceDistance} km / ${totalLength} km)`, remainingLine, err)
        }
        // console.log('remainingLine', remainingLine)
        if (remainingLine.geometry.coordinates.length < 2) {
          throw new Error(
github ibi-group / datatools-ui / lib / editor / selectors / index.js View on Github external
])
          } else {
            // Otherwise, slice line at specified distance.
            lineSegment = lineSliceAlong(remainingLine, 0, sliceDistance)
            if (!lineSegment) {
              console.warn(`Could not slice remaining line segment at index=${i}`)
            }
            const endOfLine = lineDistance(remainingLine, 'kilometers')
            if (sliceDistance >= endOfLine) {
              // Do not attempt to slice line if the distance parameters are not
              // correctly aligned. This seems to sometimes happen perhaps due to
              // rounding errors on the final pattern stop.
              console.warn(`Slice begin distance (${sliceDistance} km) is greater than or equal to end distance (${endOfLine} km). Cannot slice.`)
            } else {
              try {
                remainingLine = lineSliceAlong(
                  remainingLine,
                  sliceDistance,
                  endOfLine
                )
              } catch (err) {
                console.warn(`Could not slice remaining line segment at stop index=${i}`, remainingLine, `${sliceDistance} km to ${endOfLine} km`, err)
              }
            }
          }
          patternSegments.push(lineSegment.geometry.coordinates)
          previousDistance = distance
        }
        continue
      }
      // console.log(`generating shape point for stop #${i} at distance: ${scaledDistanceInMeters}`, patternStop, remainingLine)
      if (i === 0 && scaledDistanceInMeters !== 0) {
github ibi-group / datatools-ui / lib / editor / selectors / index.js View on Github external
remainingLine,
          insertPoint,
          point([stop.stop_lon, stop.stop_lat])
        ])
        console.warn(`Slice distance for pattern stop index=${i} is ${sliceDistance} (${distance} - ${previousDistance}), setting to 1 meter
        http://geojson.io/#data=data:application/json,${encodeURIComponent(JSON.stringify(features))}`, patternStop)
        sliceDistance = 1 / 1000 // set slice distance to 1 meter if negative or zero
      }
      // console.log(`slicing line at ${sliceDistance} km`, remainingLine)
      const lineSegment = lineSliceAlong(remainingLine, 0, sliceDistance)
      const totalLength = lineDistance(remainingLine)
      // console.log(`slice #${i}/${patternStops.length - 1}`, lineSegment)
      if (i < patternStops.length - 1) {
        // Compute remaining line segment (only if not working on the final stop)
        try {
          remainingLine = lineSliceAlong(
            remainingLine,
            sliceDistance,
            totalLength
          )
        } catch (err) {
          console.warn(`Could not slice line for stop index=${i} (at ${sliceDistance} km / ${totalLength} km)`, remainingLine, err)
        }
        // console.log('remainingLine', remainingLine)
        if (remainingLine.geometry.coordinates.length < 2) {
          throw new Error(
            `Remaining line after pattern stop #${i}/${patternStops.length -
              1} has fewer than two coordinates`
          )
        }
      }
      patternSegments.push(lineSegment.geometry.coordinates)
github Turfjs / turf / packages / turf-line-chunk / index.js View on Github external
function sliceLineSegments(line, segmentLength, units, callback) {
    var lineLength = lineDistance(line, {units: units});

    // If the line is shorter than the segment length then the orginal line is returned.
    if (lineLength <= segmentLength) return callback(line);

    var numberOfSegments = lineLength / segmentLength;

    // If numberOfSegments is integer, no need to plus 1
    if (!Number.isInteger(numberOfSegments)) {
        numberOfSegments = Math.floor(numberOfSegments) + 1;
    }

    for (var i = 0; i < numberOfSegments; i++) {
        var outline = lineSliceAlong(line, segmentLength * i, segmentLength * (i + 1), {units: units});
        callback(outline, i);
    }
}

@turf/line-slice-along

turf line-slice-along module

MIT
Latest version published 3 years ago

Package Health Score

78 / 100
Full package analysis

Popular @turf/line-slice-along functions