[Pkg-javascript-commits] [leaflet-markercluster] 30/479: Add QuickHull and use it for calculating convex hulls. (From http://en.literateprograms.org/Quickhull_(Javascript)?oldid=18434 - Referenced in code) Needs tidying up to use LatLng objects rather than having to change back and forth
Jonas Smedegaard
dr at jones.dk
Thu Oct 16 16:00:05 UTC 2014
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js pushed a commit to branch master
in repository leaflet-markercluster.
commit e32c4de14cd65fab7a385e135da6641498997d6c
Author: danzel <danzel at localhost.geek.nz>
Date: Wed Jul 18 10:52:47 2012 +1200
Add QuickHull and use it for calculating convex hulls. (From http://en.literateprograms.org/Quickhull_(Javascript)?oldid=18434 - Referenced in code) Needs tidying up to use LatLng objects rather than having to change back and forth
---
example/marker-clustering-convexhull.html | 110 +++++++++++++++++++++++++++
src/MarkerCluster.QuickHull.js | 120 ++++++++++++++++++++++++++++++
2 files changed, 230 insertions(+)
diff --git a/example/marker-clustering-convexhull.html b/example/marker-clustering-convexhull.html
new file mode 100644
index 0000000..6e4531b
--- /dev/null
+++ b/example/marker-clustering-convexhull.html
@@ -0,0 +1,110 @@
+<!DOCTYPE html>
+<html>
+<head>
+ <title>Leaflet debug page</title>
+
+ <link rel="stylesheet" href="../lib/leaflet-dist/leaflet.css" />
+ <!--[if lte IE 8]><link rel="stylesheet" href="../lib/leaflet-dist/leaflet.ie.css" /><![endif]-->
+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
+ <link rel="stylesheet" href="screen.css" />
+ <script src="../lib/leaflet-dist/leaflet-src.js"></script>
+
+
+ <link rel="stylesheet" href="../src/MarkerCluster.css" />
+ <link rel="stylesheet" href="../src/MarkerCluster.Default.css" />
+ <script src="../src/MarkerClusterGroup.js"></script>
+ <script src="../src/MarkerCluster.js"></script>
+ <script src="../src/MarkerCluster.QuickHull.js"></script>
+</head>
+<body>
+
+ <div id="map"></div>
+ <button id="populate">Populate 1 marker</button>
+ <button id="remove">Remove 1 marker</button>
+
+ <script type="text/javascript">
+
+ var cloudmadeUrl = 'http://{s}.tile.cloudmade.com/BC9A493B41014CAABB98F0471D759707/997/256/{z}/{x}/{y}.png',
+ cloudmadeAttribution = 'Map data © 2011 OpenStreetMap contributors, Imagery © 2011 CloudMade',
+ cloudmade = new L.TileLayer(cloudmadeUrl, {maxZoom: 18, attribution: cloudmadeAttribution}),
+ latlng = new L.LatLng(50.5, 30.51);
+
+ var map = new L.Map('map', {center: latlng, zoom: 15, layers: [cloudmade]});
+
+ var markers = new L.MarkerClusterGroup();
+ var markersList = [];
+
+ function populate() {
+ for (var i = 0; i < 100; i++) {
+ var m = new L.Marker(getRandomLatLng(map));
+ markersList.push(m);
+ markers.addLayer(m);
+ }
+ return false;
+ }
+ function populateRandomVector() {
+ for (var i = 0, latlngs = [], len = 20; i < len; i++) {
+ latlngs.push(getRandomLatLng(map));
+ }
+ var path = new L.Polyline(latlngs);
+ map.addLayer(path);
+ }
+ function getRandomLatLng(map) {
+ var bounds = map.getBounds(),
+ southWest = bounds.getSouthWest(),
+ northEast = bounds.getNorthEast(),
+ lngSpan = northEast.lng - southWest.lng,
+ latSpan = northEast.lat - southWest.lat;
+
+ return new L.LatLng(
+ southWest.lat + latSpan * Math.random(),
+ southWest.lng + lngSpan * Math.random());
+ }
+
+ markers.on('click', function (a) {
+ if (a.layer instanceof L.MarkerCluster) {
+ console.log('cluster ' + a.layer.getAllChildMarkers().length);
+ //a.layer.zoomToBounds();
+ var ms = a.layer.getAllChildMarkers();
+ var p = [];
+ for (var i = 0; i < ms.length; i++) {
+ var ll = ms[i].getLatLng();
+ p.push([ll.lat, ll.lng]);
+ }
+ var hull = L.QuickHull.getConvexHull(p);
+ var hullll = [];
+ for (var i = 0; i < hull.length; i++) {
+ var p = hull[i];
+ var ll = new L.LatLng(p[0][0], p[0][1]);
+ hullll.push(ll);
+ }
+
+ var path = new L.Polygon(hullll);
+ map.addLayer(path);
+ } else {
+ console.log('marker ' + a.layer);
+ }
+ });
+
+ populate();
+ //populateRandomVector();
+ map.addLayer(markers);
+
+ L.DomUtil.get('populate').onclick = function () {
+ var bounds = map.getBounds(),
+ southWest = bounds.getSouthWest(),
+ northEast = bounds.getNorthEast(),
+ lngSpan = northEast.lng - southWest.lng,
+ latSpan = northEast.lat - southWest.lat;
+ var m = new L.Marker(new L.LatLng(
+ southWest.lat + latSpan * 0.5,
+ southWest.lng + lngSpan * 0.5));
+ markersList.push(m);
+ markers.addLayer(m);
+ };
+ L.DomUtil.get('remove').onclick = function () {
+ markers.removeLayer(markersList.pop());
+ };
+ </script>
+</body>
+</html>
diff --git a/src/MarkerCluster.QuickHull.js b/src/MarkerCluster.QuickHull.js
new file mode 100644
index 0000000..b2afe46
--- /dev/null
+++ b/src/MarkerCluster.QuickHull.js
@@ -0,0 +1,120 @@
+/* Copyright (c) 2012 the authors listed at the following URL, and/or
+the authors of referenced articles or incorporated external code:
+http://en.literateprograms.org/Quickhull_(Javascript)?action=history&offset=20120410175256
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Retrieved from: http://en.literateprograms.org/Quickhull_(Javascript)?oldid=18434
+*/
+
+(function () {
+ L.QuickHull = {
+ getDistant: function (cpt, bl) {
+ var Vy = bl[1][0] - bl[0][0];
+ var Vx = bl[0][1] - bl[1][1];
+ return (Vx * (cpt[0] - bl[0][0]) + Vy * (cpt[1] - bl[0][1]))
+ },
+
+
+ findMostDistantPointFromBaseLine: function (baseLine, points) {
+ var maxD = 0;
+ var maxPt = new Array();
+ var newPoints = new Array();
+ for (var idx in points) {
+ var pt = points[idx];
+ var d = this.getDistant(pt, baseLine);
+
+ if (d > 0) {
+ newPoints.push(pt);
+ } else {
+ continue;
+ }
+
+ if (d > maxD) {
+ maxD = d;
+ maxPt = pt;
+ }
+
+ }
+ return { 'maxPoint': maxPt, 'newPoints': newPoints }
+ },
+
+ buildConvexHull: function (baseLine, points) {
+ var convexHullBaseLines = new Array();
+ var t = this.findMostDistantPointFromBaseLine(baseLine, points);
+ if (t.maxPoint.length) { // if there is still a point "outside" the base line
+ convexHullBaseLines =
+ convexHullBaseLines.concat(
+ this.buildConvexHull([baseLine[0], t.maxPoint], t.newPoints)
+ );
+ convexHullBaseLines =
+ convexHullBaseLines.concat(
+ this.buildConvexHull([t.maxPoint, baseLine[1]], t.newPoints)
+ );
+ return convexHullBaseLines;
+ } else { // if there is no more point "outside" the base line, the current base line is part of the convex hull
+ return [baseLine];
+ }
+ },
+
+ getConvexHull: function (points) {
+ //find first baseline
+ var maxX, minX;
+ var maxPt, minPt;
+ for (var idx in points) {
+ var pt = points[idx];
+ if (pt[0] > maxX || !maxX) {
+ maxPt = pt;
+ maxX = pt[0];
+ }
+ if (pt[0] < minX || !minX) {
+ minPt = pt;
+ minX = pt[0];
+ }
+ }
+ var ch = [].concat(this.buildConvexHull([minPt, maxPt], points),
+ this.buildConvexHull([maxPt, minPt], points))
+ return ch;
+ }
+ }
+}());
+
+L.MarkerCluster.include({
+ getConvexHull: function () {
+ var childMarkers = this.getAllChildMarkers(),
+ points = [],
+ hullLatLng = [],
+ hull, p, i;
+
+ for (var i = ms.lenght; i >= 0; i--) {
+ ll = ms[i].getLatLng();
+ points.push([ll.lat, ll.lng]);
+ }
+
+ hull = L.QuickHull.getConvexHull(points);
+
+ for (var i = 0; i < hull.length; i++) {
+ p = hull[i];
+ hullLatLng.push(new L.LatLng(p[0][0], p[0][1]));
+ }
+
+ return hullLatLng;
+ }
+});
\ No newline at end of file
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