ML-slice/slice.html at master · retwere/ML-slice · GitHub

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<!DOCTYPE html>
<!--
Copyright 2016 MarkLogic Corporation

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<html>


<head>
    <title>GeoHash Slice</title>
    <style type="text/css">
      html, body, div { margin: 0; padding: 0; }
      html, body { height: 100%; }
    </style>
    <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBWj1dLecWvRSiLz99rdI_P7AaDxoz0odw&libraries=drawing,visualization&v=3"></script>
    <script type="text/javascript" src="maplabel.js"></script>
    <script type="text/javascript" src="//code.jquery.com/jquery-1.11.1.min.js"></script>
    <script type="text/javascript" src="http://geographiclib.sourceforge.net/scripts/geographiclib.min.js"></script>
    <script type="text/javascript">
var theMap;
var geodesics = [];
var labels = [];
var showGeodesics = false;
var showLabels = true;
var geod = GeographicLib.Geodesic.WGS84;

function drawSlices(slices) {
  theMap.data.setStyle({
    fillColor: 'green',
    fillOpacity: 0.2,
    strokeColor: 'black',
    strokeWeight: 2
  });
  for (var i=0; i<slices.length; ++i) {
    var features = theMap.data.addGeoJson(slices[i]);
  }
}

function drawHashes(hashes) {
  document.getElementById('wkt_textbox').value = hashes.polygonWkt;
  if (hashes.slices) {
    drawSlices(hashes.slices);
  }
}

function drawHashesWkt(hashes) {
  if (hashes.feature) {
    //var features = theMap.data.addGeoJson(hashes.feature);
    var latlngs = [];
    if (hashes.feature.geometry.type == "LineString") {
      features[0].getGeometry().getArray().forEach(function(a) {
        latlngs.push({ lat: a.lat(), lng: a.lng() });
      });
      drawGeodesicsLS(latlngs);
    } else if (hashes.feature.geometry.type != "Point") {
      var geom = features[0].getGeometry();
      for (var i = 0; i < geom.getLength(); ++i) {
        features[0].getGeometry().getAt(i).getArray().forEach(function(a) {
          latlngs.push({ lat: a.lat(), lng: a.lng() });
        });
        drawGeodesics(latlngs);
        latlngs = [];
      }
    }
  } else if (hashes.polygonWkt.charAt(0) == '@') {
    //draw the circle
    var circleStr = hashes.polygonWkt.substring(1);
    var circleData = circleStr.split(/[ |,]/);
    var radius = Number(circleData[0]) / 0.000621371;
    var center = {
      lat: Number(circleData[1]),
      lng: Number(circleData[2])
    };
    var circle = new google.maps.Circle({
      map: theMap,
      center: center,
      radius: radius
    });
  } else if (hashes.polygonWkt.charAt(0) == '[') {
    //draw the box
    var rectStr = hashes.polygonWkt.replace(/[\[|\]]/g,"");
    var rectData = rectStr.split(",").map(Number);
    var rectangle = new google.maps.Rectangle({
      map: theMap,
      bounds: {
        south: rectData[0],
        west: rectData[1],
        north: rectData[2],
        east: rectData[3]
      }
    });
  }
  if (hashes.slices) {
    drawSlices(hashes.slices);
  }
  theMap.panTo(new google.maps.LatLng(hashes.center.lat, hashes.center.lng));
}

function fetchHashesPoly(poly) {
  var latlngs = [];
  var str = "";
  poly.getPath().forEach(function(xy, i) {
    latlngs[i] = {"lat": xy.lat(), "lng": xy.lng() };
    str = str + xy.lat() + "," + xy.lng() + " ";
  });
  drawGeodesics(latlngs);
  fetchHashes(str);
}

function fetchHashesLine(line) {
  var latlngs = [];
  var str = "LINESTRING(";
  line.getPath().forEach(function(xy, i) {
    latlngs[i] = {"lat": xy.lat(), "lng": xy.lng() };
    str = str + xy.lng() + " " + xy.lat() + ",";
  });
  str.replace(/,$/, "") + ")";
  drawGeodesicsLS(latlngs);
  fetchHashes(str);
}

function fetchHashesCirc(circ) {
  var radius = circ.getRadius()*0.000621371;
  var center = circ.getCenter();
  var lat = center.lat();
  var lng = center.lng();
  var str = "@" + radius + " " + lat + "," + lng;
  fetchHashes(str);
}

function fetchHashesRect(rect) {
  var bounds = rect.getBounds();
  var sw = bounds.getSouthWest();
  var s = sw.lat();
  var w = sw.lng();
  var ne = bounds.getNorthEast();
  var n = ne.lat();
  var e = ne.lng();
  var str = "[" + s + "," + w + "," + n + "," + e + "]";
  fetchHashes(str);
}

function fetchHashesMark(mark) {
  var pt = mark.getPosition();
  var str = pt.lat() + "," + pt.lng();
  fetchHashes(str);
}

function fetchHashes(str) {
  var precision = $("#precision").val();
  var payload = { precision: precision, region: str };
  $.ajax({
    type: "POST",
    url: "slice.xqy",
    data: JSON.stringify(payload),
    contentType: "application/json",
    dataType: "json",
    success: drawHashes
  });
}

function hashWKT(wkt) {
  var precision = $("#precision").val();
  var payload = { precision: precision, region: wkt }
  $.ajax({
    type: "POST",
    url: "slice.xqy",
    data: JSON.stringify(payload),
    contentType: "application/json",
    dataType: "json",
    success: drawHashesWkt
  });
}

function initialize() {
  var mapOptions = {
    center: { lat: 37.507377, lng: -122.247081 },
    zoom: 13
  };
  theMap = new google.maps.Map(document.getElementById('map-canvas'),mapOptions);

  var drawingManager = new google.maps.drawing.DrawingManager();
  drawingManager.setMap(theMap);

  google.maps.event.addListener(drawingManager, 'polygoncomplete', fetchHashesPoly);
  google.maps.event.addListener(drawingManager, 'circlecomplete', fetchHashesCirc);
  google.maps.event.addListener(drawingManager, 'polylinecomplete', fetchHashesLine);
  google.maps.event.addListener(drawingManager, 'rectanglecomplete', fetchHashesRect);
  google.maps.event.addListener(drawingManager, 'markercomplete', fetchHashesMark);
}

google.maps.event.addDomListener(window, 'load', initialize);

function doResize() {
  $("#map-canvas").css("height", $(window).height() - $("#text").height());
}
$(doResize);
$(window).resize(doResize);

function drawGeodesics(g) {
  for (var i = 0; i < g.length-1; ++i) {
    drawGeodesic(g[i].lat,g[i].lng,g[i+1].lat,g[i+1].lng);
  }
  drawGeodesic(g[g.length-1].lat,g[g.length-1].lng,g[0].lat,g[0].lng);
}

function drawGeodesicsLS(g) {
  for (var i = 0; i < g.length-1; ++i) {
    drawGeodesic(g[i].lat,g[i].lng,g[i+1].lat,g[i+1].lng);
  }
}

function drawGeodesic(lat1, lon1, lat2, lon2) {
  var v = geod.Inverse(lat1, lon1, lat2, lon2);
  var points = geod.DirectPath(v.lat1, v.lon1, v.azi1, v.s12,
                               100000, 100);
  var geodesicOptions = {
    strokeColor: '#0000FF',
    strokeOpacity: 1,
    strokeWeight: 3,
    geodesic: true
  }
  var geodesic = new google.maps.Polyline(geodesicOptions);
  geodesics.push(geodesic);
  if (showGeodesics) {
    geodesic.setMap(theMap);
  } else {
    geodesic.setMap(null);
  }
  var path = geodesic.getPath();
  for (var k = 0; k < points.length; ++k) {
    path.push(new google.maps.LatLng(points[k].lat, points[k].lon));
  }
};

function toggleGeodesics() {
  if (showGeodesics) {
    showGeodesics = false;
    document.getElementById('geod_button').firstChild.data = "Show Geodesic Arcs";
    for (var i = 0; i < geodesics.length; ++i) {
      geodesics[i].setMap(null);
    }
  } else {
    showGeodesics = true;
    document.getElementById('geod_button').firstChild.data = "Hide Geodesic Arcs";
    for (var i = 0; i < geodesics.length; ++i) {
      geodesics[i].setMap(theMap);
    }
  }
};

function toggleLabels() {
  if (showLabels) {
    showLabels = false;
    document.getElementById('label_button').firstChild.data = "Show Labels";
    for (var i = 0; i < labels.length; ++i) {
      labels[i].setMap(null);
    }
  } else {
    showLabels = true;
    document.getElementById('label_button').firstChild.data = "Hide Labels";
    for (var i = 0; i < labels.length; ++i) {
      labels[i].setMap(theMap);
    }
  }
}

(function(g) {
  "use strict";

  /*
   * split a geodesic line into k equal pieces which are no longer than about
   * ds12 (but k cannot exceed maxk, default 20), and returns an array of
   * length k + 1 of objects with fields lat, lon, azi.
   */
  g.Geodesic.prototype.DirectPath =
    function(lat1, lon1, azi1, s12, ds12, maxk) {
      var t = this.Direct(lat1, lon1, azi1, s12),
          k, points, line, da12, vals, i;
      if (!maxk) maxk = 20;
      if (!(ds12 > 0))
        throw new Error("ds12 must be a positive number");
      k = Math.max(1, Math.min(maxk, Math.ceil(Math.abs(t.s12)/ds12)));
      points = new Array(k + 1);
      points[0] = {lat: t.lat1, lon: t.lon1, azi: t.azi1};
      points[k] = {lat: t.lat2, lon: t.lon2, azi: t.azi2};
      if (k > 1) {
        line = this.Line(t.lat1, t.lon1, t.azi1, g.STANDARD);
        da12 = t.a12/k;
        for (i = 1; i < k; ++i) {
          vals = line.ArcPosition(i * da12);
          points[i] = {lat: vals.lat2, lon: vals.lon2, azi: vals.azi2};
        }
      }
      return points;
    };
})(GeographicLib.Geodesic);

    </script>
</head>


<body>
  <div id="text">
    <textarea rows="4" cols="80" id="wkt_textbox" placeholder="Input WKT or string serialized cts:region..."></textarea>

    <button type="button" onclick="hashWKT(document.getElementById('wkt_textbox').value);">GeoHash</button>
    <button type="button" id="label_button"  onclick="toggleLabels();">Hide Labels</button>
    <button type="button" id="geod_button" onclick="toggleGeodesics();">Show Geodesic Arcs</button>
    Precision:
    <select id="precision">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
      <option value="4">4</option>
      <option value="5">5</option>
      <option value="6" selected>6</option>
      <option value="7">7</option>
      <option value="8">8</option>
      <option value="9">9</option>
      <option value="10">10</option>
      <option value="11">11</option>
      <option value="12">12</option>
    </select>
  </div>
  <div id="map-canvas"></div>
</body>


</html>