"use strict";Object.defineProperty(exports, "__esModule", {value: true});// index.js var _meta = require('@turf/meta'); var _invariant = require('@turf/invariant'); var _helpers = require('@turf/helpers'); // lib/intersection.js function ab(segment) { var start = segment[0]; var end = segment[1]; return [end[0] - start[0], end[1] - start[1]]; } function crossProduct(v1, v2) { return v1[0] * v2[1] - v2[0] * v1[1]; } function add(v1, v2) { return [v1[0] + v2[0], v1[1] + v2[1]]; } function sub(v1, v2) { return [v1[0] - v2[0], v1[1] - v2[1]]; } function scalarMult(s, v) { return [s * v[0], s * v[1]]; } function intersectSegments(a, b) { var p = a[0]; var r = ab(a); var q = b[0]; var s = ab(b); var cross = crossProduct(r, s); var qmp = sub(q, p); var numerator = crossProduct(qmp, s); var t = numerator / cross; var intersection2 = add(p, scalarMult(t, r)); return intersection2; } function isParallel(a, b) { var r = ab(a); var s = ab(b); return crossProduct(r, s) === 0; } function intersection(a, b) { if (isParallel(a, b)) return false; return intersectSegments(a, b); } // index.js function lineOffset(geojson, distance, options) { options = options || {}; if (!_helpers.isObject.call(void 0, options)) throw new Error("options is invalid"); var units = options.units; if (!geojson) throw new Error("geojson is required"); if (distance === void 0 || distance === null || isNaN(distance)) throw new Error("distance is required"); var type = _invariant.getType.call(void 0, geojson); var properties = geojson.properties; switch (type) { case "LineString": return lineOffsetFeature(geojson, distance, units); case "MultiLineString": var coords = []; _meta.flattenEach.call(void 0, geojson, function(feature) { coords.push( lineOffsetFeature(feature, distance, units).geometry.coordinates ); }); return _helpers.multiLineString.call(void 0, coords, properties); default: throw new Error("geometry " + type + " is not supported"); } } function lineOffsetFeature(line, distance, units) { var segments = []; var offsetDegrees = _helpers.lengthToDegrees.call(void 0, distance, units); var coords = _invariant.getCoords.call(void 0, line); var finalCoords = []; coords.forEach(function(currentCoords, index) { if (index !== coords.length - 1) { var segment = processSegment( currentCoords, coords[index + 1], offsetDegrees ); segments.push(segment); if (index > 0) { var seg2Coords = segments[index - 1]; var intersects = intersection(segment, seg2Coords); if (intersects !== false) { seg2Coords[1] = intersects; segment[0] = intersects; } finalCoords.push(seg2Coords[0]); if (index === coords.length - 2) { finalCoords.push(segment[0]); finalCoords.push(segment[1]); } } if (coords.length === 2) { finalCoords.push(segment[0]); finalCoords.push(segment[1]); } } }); return _helpers.lineString.call(void 0, finalCoords, line.properties); } function processSegment(point1, point2, offset) { var L = Math.sqrt( (point1[0] - point2[0]) * (point1[0] - point2[0]) + (point1[1] - point2[1]) * (point1[1] - point2[1]) ); var out1x = point1[0] + offset * (point2[1] - point1[1]) / L; var out2x = point2[0] + offset * (point2[1] - point1[1]) / L; var out1y = point1[1] + offset * (point1[0] - point2[0]) / L; var out2y = point2[1] + offset * (point1[0] - point2[0]) / L; return [ [out1x, out1y], [out2x, out2y] ]; } var turf_line_offset_default = lineOffset; exports.default = turf_line_offset_default; exports.lineOffset = lineOffset; //# sourceMappingURL=index.cjs.map