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Added support for multi polyline and polygon #40

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Added support for multi polyline and polygon #40

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97 changes: 60 additions & 37 deletions leaflet-measure-path.js
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Original file line number Diff line number Diff line change
Expand Up @@ -272,10 +272,13 @@
updateMeasurements: function() {
if (!this._measurementLayer) return this;

this._totalArea = 0;

var latLngs = this.getLatLngs(),
isPolygon = this instanceof L.Polygon,
options = this._measurementOptions,
totalDist = 0,
multi = false,
formatter,
ll1,
ll2,
Expand All @@ -284,49 +287,69 @@
pixelDist,
dist;

if (latLngs && latLngs.length && L.Util.isArray(latLngs[0])) {
// Outer ring is stored as an array in the first element,
// use that instead.
latLngs = latLngs[0];
}

this._measurementLayer.clearLayers();

if (this._measurementOptions.showDistances && latLngs.length > 1) {
formatter = this._measurementOptions.formatDistance || L.bind(this.formatDistance, this);

for (var i = 1, len = latLngs.length; (isPolygon && i <= len) || i < len; i++) {
ll1 = latLngs[i - 1];
ll2 = latLngs[i % len];
dist = ll1.distanceTo(ll2);
totalDist += dist;

p1 = this._map.latLngToLayerPoint(ll1);
p2 = this._map.latLngToLayerPoint(ll2);

pixelDist = p1.distanceTo(p2);

if (pixelDist >= options.minPixelDistance) {
L.marker.measurement(
this._map.layerPointToLatLng([(p1.x + p2.x) / 2, (p1.y + p2.y) / 2]),
formatter(dist), options.lang.segmentLength, this._getRotation(ll1, ll2), options)
.addTo(this._measurementLayer);
let _this = this;

let proccess = function(theLatLngs){
if (theLatLngs && theLatLngs.length && L.Util.isArray(theLatLngs[0])) {
// Outer ring is stored as an array in the first element,
// use that instead.
multi = true;
theLatLngs.forEach(function(ll){
proccess(ll);
});
} else {
totalDist = 0;
if (_this._measurementOptions.showDistances && theLatLngs.length > 1) {
formatter = _this._measurementOptions.formatDistance || L.bind(_this.formatDistance, _this);

for (var i = 1, len = theLatLngs.length; (isPolygon && i <= len) || i < len; i++) {
ll1 = theLatLngs[i - 1];
ll2 = theLatLngs[i % len];
dist = ll1.distanceTo(ll2);
totalDist += dist;

p1 = _this._map.latLngToLayerPoint(ll1);
p2 = _this._map.latLngToLayerPoint(ll2);

pixelDist = p1.distanceTo(p2);

if (pixelDist >= options.minPixelDistance) {
L.marker.measurement(
_this._map.layerPointToLatLng([(p1.x + p2.x) / 2, (p1.y + p2.y) / 2]),
formatter(dist), options.lang.segmentLength, _this._getRotation(ll1, ll2), options)
.addTo(_this._measurementLayer);
}
}

// Show total length for polylines
if (!multi && !isPolygon && _this._measurementOptions.showTotalDistance) {
L.marker.measurement(ll2, formatter(totalDist), options.lang.totalLength, 0, options)
.addTo(_this._measurementLayer);
}
}
}

// Show total length for polylines
if (!isPolygon && this._measurementOptions.showTotalDistance) {
L.marker.measurement(ll2, formatter(totalDist), options.lang.totalLength, 0, options)
.addTo(this._measurementLayer);
}
}

if (isPolygon && options.showArea && latLngs.length > 2) {
formatter = options.formatArea || L.bind(this.formatArea, this);
var area = ringArea(latLngs);
L.marker.measurement(this.getBounds().getCenter(),
formatter(area), options.lang.totalArea, 0, options)
.addTo(this._measurementLayer);
proccess(latLngs);

latLngs = _this.getLatLngs();

// Show total area for polygons, use turf if available, if not, multi-polygons are not supported
if(isPolygon && options.showArea && (latLngs.length > 2 || multi)) {
if(typeof turf === "object" && typeof turf.area === "function"){
formatter = options.formatArea || L.bind(_this.formatArea, _this);
L.marker.measurement(_this.getBounds().getCenter(),
formatter(turf.area(_this.toGeoJSON())), options.lang.totalArea, 0, options)
.addTo(_this._measurementLayer);
} else if(!multi){
formatter = options.formatArea || L.bind(_this.formatArea, _this);
var area = ringArea(latLngs);
L.marker.measurement(_this.getBounds().getCenter(),
formatter(area), options.lang.totalArea, 0, options)
.addTo(_this._measurementLayer);
}
}

return this;
Expand Down