leaflet_wkt

(function (root, factory) { // Node. if(typeof module === 'object' && typeof module.exports === 'object') { exports = module.exports = factory(); } // Browser Global. if(typeof window === "object") { root.Terraformer = factory(); } }(this, function(){ var exports = {}, EarthRadius = 6378137, DegreesPerRadian = 57.295779513082320, RadiansPerDegree = 0.017453292519943, MercatorCRS = { "type": "link", "properties": { "href": "http://spatialreference.org/ref/sr-org/6928/ogcwkt/", "type": "ogcwkt" } }, GeographicCRS = { "type": "link", "properties": { "href": "http://spatialreference.org/ref/epsg/4326/ogcwkt/", "type": "ogcwkt" } }; /* Internal: isArray function */ function isArray(obj) { return Object.prototype.toString.call(obj) === "[object Array]"; } /* Internal: safe warning */ function warn() { var args = Array.prototype.slice.apply(arguments); if (typeof console !== undefined && console.warn) { console.warn.apply(console, args); } } /* Internal: Extend one object with another. */ function extend(destination, source) { for (var k in source) { if (source.hasOwnProperty(k)) { destination[k] = source[k]; } } return destination; } /* Public: Calculate an bounding box for a geojson object */ function calculateBounds (geojson) { if(geojson.type){ switch (geojson.type) { case 'Point': return [ geojson.coordinates[0], geojson.coordinates[1], geojson.coordinates[0], geojson.coordinates[1]]; case 'MultiPoint': return calculateBoundsFromArray(geojson.coordinates); case 'LineString': return calculateBoundsFromArray(geojson.coordinates); case 'MultiLineString': return calculateBoundsFromNestedArrays(geojson.coordinates); case 'Polygon': return calculateBoundsFromNestedArrays(geojson.coordinates); case 'MultiPolygon': return calculateBoundsFromNestedArrayOfArrays(geojson.coordinates); case 'Feature': return geojson.geometry? calculateBounds(geojson.geometry) : null; case 'FeatureCollection': return calculateBoundsForFeatureCollection(geojson); case 'GeometryCollection': return calculateBoundsForGeometryCollection(geojson); default: throw new Error("Unknown type: " + geojson.type); } } return null; } /* Internal: Calculate an bounding box from an nested array of positions [ [ [ [lng, lat],[lng, lat],[lng, lat] ] ] [ [lng, lat],[lng, lat],[lng, lat] ] [ [lng, lat],[lng, lat],[lng, lat] ] ] */ function calculateBoundsFromNestedArrays (array) { var x1 = null, x2 = null, y1 = null, y2 = null; for (var i = 0; i < array.length; i++) { var inner = array[i]; for (var j = 0; j < inner.length; j++) { var lonlat = inner[j]; var lon = lonlat[0]; var lat = lonlat[1]; if (x1 === null) { x1 = lon; } else if (lon < x1) { x1 = lon; } if (x2 === null) { x2 = lon; } else if (lon > x2) { x2 = lon; } if (y1 === null) { y1 = lat; } else if (lat < y1) { y1 = lat; } if (y2 === null) { y2 = lat; } else if (lat > y2) { y2 = lat; } } } return [x1, y1, x2, y2 ]; } /* Internal: Calculate a bounding box from an array of arrays of arrays [ [ [lng, lat],[lng, lat],[lng, lat] ] [ [lng, lat],[lng, lat],[lng, lat] ] [ [lng, lat],[lng, lat],[lng, lat] ] ] */ function calculateBoundsFromNestedArrayOfArrays (array) { var x1 = null, x2 = null, y1 = null, y2 = null; for (var i = 0; i < array.length; i++) { var inner = array[i]; for (var j = 0; j < inner.length; j++) { var innerinner = inner[j]; for (var k = 0; k < innerinner.length; k++) { var lonlat = innerinner[k]; var lon = lonlat[0]; var lat = lonlat[1]; if (x1 === null) { x1 = lon; } else if (lon < x1) { x1 = lon; } if (x2 === null) { x2 = lon; } else if (lon > x2) { x2 = lon; } if (y1 === null) { y1 = lat; } else if (lat < y1) { y1 = lat; } if (y2 === null) { y2 = lat; } else if (lat > y2) { y2 = lat; } } } } return [x1, y1, x2, y2]; } /* Internal: Calculate a bounding box from an array of positions [ [lng, lat],[lng, lat],[lng, lat] ] */ function calculateBoundsFromArray (array) { var x1 = null, x2 = null, y1 = null, y2 = null; for (var i = 0; i < array.length; i++) { var lonlat = array[i]; var lon = lonlat[0]; var lat = lonlat[1]; if (x1 === null) { x1 = lon; } else if (lon < x1) { x1 = lon; } if (x2 === null) { x2 = lon; } else if (lon > x2) { x2 = lon; } if (y1 === null) { y1 = lat; } else if (lat < y1) { y1 = lat; } if (y2 === null) { y2 = lat; } else if (lat > y2) { y2 = lat; } } return [x1, y1, x2, y2 ]; } /* Internal: Calculate an bounding box for a feature collection */ function calculateBoundsForFeatureCollection(featureCollection){ var extents = [], extent; for (var i = featureCollection.features.length - 1; i >= 0; i--) { extent = calculateBounds(featureCollection.features[i].geometry); extents.push([extent[0],extent[1]]); extents.push([extent[2],extent[3]]); } return calculateBoundsFromArray(extents); } /* Internal: Calculate an bounding box for a geometry collection */ function calculateBoundsForGeometryCollection(geometryCollection){ var extents = [], extent; for (var i = geometryCollection.geometries.length - 1; i >= 0; i--) { extent = calculateBounds(geometryCollection.geometries[i]); extents.push([extent[0],extent[1]]); extents.push([extent[2],extent[3]]); } return calculateBoundsFromArray(extents); } function calculateEnvelope(geojson){ var bounds = calculateBounds(geojson); return { x: bounds[0], y: bounds[1], w: Math.abs(bounds[0] - bounds[2]), h: Math.abs(bounds[1] - bounds[3]) }; } /* Internal: Convert radians to degrees. Used by spatial reference converters. */ function radToDeg(rad) { return rad * DegreesPerRadian; } /* Internal: Convert degrees to radians. Used by spatial reference converters. */ function degToRad(deg) { return deg * RadiansPerDegree; } /* Internal: Loop over each array in a geojson object and apply a function to it. Used by spatial reference converters. */ function eachPosition(coordinates, func) { for (var i = 0; i < coordinates.length; i++) { // we found a number so lets convert this pair if(typeof coordinates[i][0] === "number"){ coordinates[i] = func(coordinates[i]); } // we found an coordinates array it again and run THIS function against it if(typeof coordinates[i] === "object"){ coordinates[i] = eachPosition(coordinates[i], func); } } return coordinates; } /* Public: Convert a GeoJSON Position object to Geographic (4326) */ function positionToGeographic(position) { var x = position[0]; var y = position[1]; return [radToDeg(x / EarthRadius) - (Math.floor((radToDeg(x / EarthRadius) + 180) / 360) * 360), radToDeg((Math.PI / 2) - (2 * Math.atan(Math.exp(-1.0 * y / Earth