maptalks 开发GIS地图（6）maptalks 介绍

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51.  geoJson to geometry

 1   var json = {
 2     'type': 'Feature',
 3     'geometry': {
 4       'type': 'Point',
 5       'coordinates': [-0.113049,51.498568]
 6     },
 7     'properties': {
 8       'name': 'point marker'
 9     }
10   };
11   var marker = maptalks.GeoJSON.toGeometry(json).addTo(map.getLayer('v'));

52. marker to geojson

1  var marker = new maptalks.Marker([-0.113049,51.498568], {
2     'properties': {
3       'name': 'point marker'
4     }
5   }).addTo(map.getLayer('v'));
6 
7   document.getElementById('info').innerHTML = JSON.stringify(marker.toGeoJSON());

53. map to json

1   var mapJSON = map.toJSON();
2 
3   document.getElementById('json').innerHTML = JSON.stringify(mapJSON);

54. map from json

 1 var mapJSON = {
 2     "version":"1.0",
 3     "options":{
 4       "center":{ "x":-0.113049,"y":51.49856800000001 },
 5       "zoom":13
 6     },
 7     "baseLayer":{
 8       "type":"TileLayer",
 9       "id":"base",
10       "options":{
11         "urlTemplate":"http://{s}.tile.osm.org/{z}/{x}/{y}.png",
12         "subdomains":["a","b","c"]
13       }
14     },
15     "layers":[
16       {
17         "type":"VectorLayer",
18         "id":"v",
19         "geometries":[
20           {
21             "feature":{
22               "type":"Feature",
23               "geometry":{
24                 "type":"Point",
25                 "coordinates":[-0.113049,51.498568]
26               }
27             }
28           }
29         ]
30       }
31     ]
32   };
33 
34   maptalks.Map.fromJSON('map', mapJSON);

55. echart3-bus

 1   var ecOption = {
 2                 'series': [ {
 3                     'type': 'lines',
 4                     'polyline': true,
 5                     'data': busLines,
 6                     'lineStyle': {
 7                         'normal': {
 8                             'width': 0
 9                         }
10                     },
11                     'effect': {
12                         'constantSpeed': 20,
13                         'show': true,
14                         'trailLength': 0.5,
15                         'symbolSize': 1.5
16                     },
17                     'zlevel': 1
18                 }]
19             };
20             var e3Layer = new maptalks.E3Layer('e3', ecOption, { hideOnZooming : true, hideOnRotating : true, hideOnMoving : true })
21             .addTo(map);

56.point-cluster

 1 var clusterLayer = new maptalks.ClusterLayer('cluster', markers, {
 2         'noClusterWithOneMarker' : false,
 3         'maxClusterZoom' : 18,
 4         //"count" is an internal variable: marker count in the cluster.
 5         'symbol': {
 6             'markerType' : 'ellipse',
 7             'markerFill' : { property:'count', type:'interval', stops: [[0, 'rgb(135, 196, 240)'], [9, '#1bbc9b'], [99, 'rgb(216, 115, 149)']] },
 8             'markerFillOpacity' : 0.7,
 9             'markerLineOpacity' : 1,
10             'markerLineWidth' : 3,
11             'markerLineColor' : '#fff',
12             'markerWidth' : { property:'count', type:'interval', stops: [[0, 40], [9, 60], [99, 80]] },
13             'markerHeight' : { property:'count', type:'interval', stops: [[0, 40], [9, 60], [99, 80]] }
14         },
15         'drawClusterText': true,
16         'geometryEvents' : true,
17         'single': true
18     });
19 
20     map.addLayer(clusterLayer);

57. fly-echart3

1 var e3Layer = new maptalks.E3Layer('e3', getECOption())
2     .addTo(map);

58.heatmap

1   var data = addressPoints.map(function (p) { return [p[1], p[0]]; });
2   var heatlayer = new maptalks.HeatLayer('heat', data, {
3     'heatValueScale': 0.7,
4     'forceRenderOnRotating' : true,
5     'forceRenderOnMoving' : true
6   }).addTo(map);

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