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polygon-editing-geojson.html
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<body>
<div id="root">
<label>
Start at:
<gmap-autocomplete @place_changed="updateCenter($event)" />
</label>
<gmap-map :center="center" :zoom="12" style="width: 100%; height: 500px" ref="map">
<gmap-polygon v-if="paths.length > 0" :paths="paths" :editable="true" @paths_changed="updateEdited($event)"
@rightclick="handleClickForDelete"
ref="polygon">
</gmap-polygon>
</gmap-map>
<div>
<button @click="addPath()">Add Path</button>
<button @click="removePath()">Remove Path</button>
</div>
<div>
<textarea :value="polygonGeojson" style="width: 100%; height: 200px"
@input="readGeojson">
</textarea>
<div v-if="errorMessage">{{errorMessage}}</div>
</div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.2.0/vue.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.js"></script>
<script src="vue-google-maps.js"></script>
<script>
Vue.use(VueGoogleMaps, {
load: {
key: 'AIzaSyBzlLYISGjL_ovJwAehh6ydhB56fCCpPQw',
libraries: 'places',
},
});
function closeLoop (path) {
return path.concat(path.slice(0, 1))
}
document.addEventListener('DOMContentLoaded', function() {
window.XXX = new Vue({
el: '#root',
data: {
center: {lat: 1.38, lng: 103.8},
edited: null,
paths: [
],
mvcPaths: null,
errorMessage: null,
},
watch: {
polygonPaths: _.throttle(function (paths) {
if (paths) {
this.paths = paths
this.polygonGeojson = JSON.stringify({
type: 'Polygon',
coordinates: this.paths.map(path => closeLoop(path.map(({lat, lng}) => [lng, lat])))
}, null, 2)
}
}, 1000)
},
computed: {
polygonPaths: function () {
if (!this.mvcPaths) return null
let paths = [];
for (let i=0; i < this.mvcPaths.getLength(); i++) {
let path = [];
for (let j=0; j<this.mvcPaths.getAt(i).getLength(); j++) {
let point = this.mvcPaths.getAt(i).getAt(j);
path.push({lat: point.lat(), lng: point.lng()});
}
paths.push(path);
}
return paths
},
},
methods: {
updateCenter: function (place) {
this.center = {
lat: place.geometry.location.lat(),
lng: place.geometry.location.lng(),
}
},
updateEdited: function (mvcPaths) {
this.mvcPaths = mvcPaths
},
addPath: function () {
// obtain the bounds, so we can guess how big the polygon should be
var bounds = this.$refs.map.$mapObject.getBounds()
var northEast = bounds.getNorthEast()
var southWest = bounds.getSouthWest()
var center = bounds.getCenter()
var degree = this.paths.length + 1;
var f = Math.pow(0.66, degree)
// Draw a triangle. Use f to control the size of the triangle.
// i.e., every time we add a path, we reduce the size of the triangle
var path = [
{ lng: center.lng(), lat: (1-f) * center.lat() + (f) * northEast.lat() },
{ lng: (1-f) * center.lng() + (f) * southWest.lng(), lat: (1-f) * center.lat() + (f) * southWest.lat() },
{ lng: (1-f) * center.lng() + (f) * northEast.lng(), lat: (1-f) * center.lat() + (f) * southWest.lat() },
]
this.paths.push(path)
},
removePath: function () {
this.paths.splice(this.paths.length - 1, 1)
},
handleClickForDelete($event) {
if ($event.vertex) {
this.$refs.polygon.$polygonObject.getPaths()
.getAt($event.path)
.removeAt($event.vertex)
}
},
readGeojson: function ($event) {
try {
this.polygonGeojson = $event.target.value
var v = JSON.parse($event.target.value);
this.paths = v.coordinates.map(linearRing =>
linearRing.slice(0, linearRing.length - 1)
.map(([lng, lat]) => ({lat, lng}))
)
this.errorMessage = null
} catch (err) {
this.errorMessage = err.message
}
}
}
});
});
</script>
</body>