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node_modules/leaflet/src/layer/vector/Polygon.js

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+import {Polyline} from './Polyline';
+import {LatLng} from '../../geo/LatLng';
+import * as LineUtil from '../../geometry/LineUtil';
+import {Point} from '../../geometry/Point';
+import {Bounds} from '../../geometry/Bounds';
+import * as PolyUtil from '../../geometry/PolyUtil';
+
+/*
+ * @class Polygon
+ * @aka L.Polygon
+ * @inherits Polyline
+ *
+ * A class for drawing polygon overlays on a map. Extends `Polyline`.
+ *
+ * Note that points you pass when creating a polygon shouldn't have an additional last point equal to the first one — it's better to filter out such points.
+ *
+ *
+ * @example
+ *
+ * ```js
+ * // create a red polygon from an array of LatLng points
+ * var latlngs = [[37, -109.05],[41, -109.03],[41, -102.05],[37, -102.04]];
+ *
+ * var polygon = L.polygon(latlngs, {color: 'red'}).addTo(map);
+ *
+ * // zoom the map to the polygon
+ * map.fitBounds(polygon.getBounds());
+ * ```
+ *
+ * You can also pass an array of arrays of latlngs, with the first array representing the outer shape and the other arrays representing holes in the outer shape:
+ *
+ * ```js
+ * var latlngs = [
+ *   [[37, -109.05],[41, -109.03],[41, -102.05],[37, -102.04]], // outer ring
+ *   [[37.29, -108.58],[40.71, -108.58],[40.71, -102.50],[37.29, -102.50]] // hole
+ * ];
+ * ```
+ *
+ * Additionally, you can pass a multi-dimensional array to represent a MultiPolygon shape.
+ *
+ * ```js
+ * var latlngs = [
+ *   [ // first polygon
+ *     [[37, -109.05],[41, -109.03],[41, -102.05],[37, -102.04]], // outer ring
+ *     [[37.29, -108.58],[40.71, -108.58],[40.71, -102.50],[37.29, -102.50]] // hole
+ *   ],
+ *   [ // second polygon
+ *     [[41, -111.03],[45, -111.04],[45, -104.05],[41, -104.05]]
+ *   ]
+ * ];
+ * ```
+ */
+
+export var Polygon = Polyline.extend({
+
+	options: {
+		fill: true
+	},
+
+	isEmpty: function () {
+		return !this._latlngs.length || !this._latlngs[0].length;
+	},
+
+	// @method getCenter(): LatLng
+	// Returns the center ([centroid](http://en.wikipedia.org/wiki/Centroid)) of the Polygon.
+	getCenter: function () {
+		// throws error when not yet added to map as this center calculation requires projected coordinates
+		if (!this._map) {
+			throw new Error('Must add layer to map before using getCenter()');
+		}
+		return PolyUtil.polygonCenter(this._defaultShape(), this._map.options.crs);
+	},
+
+	_convertLatLngs: function (latlngs) {
+		var result = Polyline.prototype._convertLatLngs.call(this, latlngs),
+		    len = result.length;
+
+		// remove last point if it equals first one
+		if (len >= 2 && result[0] instanceof LatLng && result[0].equals(result[len - 1])) {
+			result.pop();
+		}
+		return result;
+	},
+
+	_setLatLngs: function (latlngs) {
+		Polyline.prototype._setLatLngs.call(this, latlngs);
+		if (LineUtil.isFlat(this._latlngs)) {
+			this._latlngs = [this._latlngs];
+		}
+	},
+
+	_defaultShape: function () {
+		return LineUtil.isFlat(this._latlngs[0]) ? this._latlngs[0] : this._latlngs[0][0];
+	},
+
+	_clipPoints: function () {
+		// polygons need a different clipping algorithm so we redefine that
+
+		var bounds = this._renderer._bounds,
+		    w = this.options.weight,
+		    p = new Point(w, w);
+
+		// increase clip padding by stroke width to avoid stroke on clip edges
+		bounds = new Bounds(bounds.min.subtract(p), bounds.max.add(p));
+
+		this._parts = [];
+		if (!this._pxBounds || !this._pxBounds.intersects(bounds)) {
+			return;
+		}
+
+		if (this.options.noClip) {
+			this._parts = this._rings;
+			return;
+		}
+
+		for (var i = 0, len = this._rings.length, clipped; i < len; i++) {
+			clipped = PolyUtil.clipPolygon(this._rings[i], bounds, true);
+			if (clipped.length) {
+				this._parts.push(clipped);
+			}
+		}
+	},
+
+	_updatePath: function () {
+		this._renderer._updatePoly(this, true);
+	},
+
+	// Needed by the `Canvas` renderer for interactivity
+	_containsPoint: function (p) {
+		var inside = false,
+		    part, p1, p2, i, j, k, len, len2;
+
+		if (!this._pxBounds || !this._pxBounds.contains(p)) { return false; }
+
+		// ray casting algorithm for detecting if point is in polygon
+		for (i = 0, len = this._parts.length; i < len; i++) {
+			part = this._parts[i];
+
+			for (j = 0, len2 = part.length, k = len2 - 1; j < len2; k = j++) {
+				p1 = part[j];
+				p2 = part[k];
+
+				if (((p1.y > p.y) !== (p2.y > p.y)) && (p.x < (p2.x - p1.x) * (p.y - p1.y) / (p2.y - p1.y) + p1.x)) {
+					inside = !inside;
+				}
+			}
+		}
+
+		// also check if it's on polygon stroke
+		return inside || Polyline.prototype._containsPoint.call(this, p, true);
+	}
+
+});
+
+
+// @factory L.polygon(latlngs: LatLng[], options?: Polyline options)
+export function polygon(latlngs, options) {
+	return new Polygon(latlngs, options);
+}