<template>
<div class="hot_wrapper">
<div class="map">
<div style="height:100%;width:100%;outline: none!important;" id="container" tabindex="0"> </div>
</div>
</div>
</template>
<script>
import AMap from "AMap";
export default {
data() {
return {
adCode: 330600, // Shaoxing
disProvince: null, // Regional layer
depth: 2, // Regional level 0 provincial level 1 municipal level 2 district and county level
colors: {}, // Regional color 330683 Shanchengzhou City
// 330624 Xinchang County
// 330604 Shangyu District
// 330602 Yuecheng District
// 330603 Keqiao District
// 330681 Zhuji City
city: 'Shaoxing City',
mapData:[],// Map latitude and longitude data
mapDataMarker:[],//The number of changes in the graph level changes
pathContentArr:[],//Tips on the number of changes in the map level
unitId:'',//Unit id
iconPath:'',//Icon Path
}
},
methods:{
initMap() {// Create a map
var that = this
this.map = new AMap.Map('container', {
zoom:10,
zooms: [10,14],
center:[120.535719,29.956348],
// center:[120.580444,29.859701],
resizeEnable: true,
showIndoorMap: false,
mapStyle:"amap://styles/0206dfbcbabc11e4971c1a2e6bcdda2e",
// mapStyle:"amap://styles/darkblue",
features:['point','road','bg'],// Map elements
viewMode:"2D",
pitch:45,
zoomEnable:true,
// dragEnable: false,
})
AMap.plugin('', function() {
that.geocoder = new AMap.Geocoder({
})
})
that.drawMarkerByDistance(that.map.getZoom())//Initial call to marker filtering method. Rendering the map
this.map.on("zoomchange",function(){//Change the level. Point re-render
//Clear the point information on the map
for (var i = that.mapDataMarker.length - 1; i >= 0; i--) {
that.mapDataMarker[i].setMap(null);
}
for (var i = that.pathContentArr.length - 1; i >= 0; i--) {
that.pathContentArr[i].setMap(null);
}
that.mapDataMarker=[];
that.pathContentArr=[];
that.drawMarkerByDistance(that.map.getZoom())
})
},
},
Rad(d){//Convert latitude and longitude into a medium-sized table form of trigonometric function.
return d * Math.PI / 180.0;
},
//Calculate the distance, the parameters are the latitude and longitude of the first point; the latitude and longitude of the second point are respectively;
GetDistance(lat1,lng1,lat2,lng2){
var radLat1 = this.Rad(lat1);
var radLat2 = this.Rad(lat2);
var a = radLat1 - radLat2;
var b = this.Rad(lng1) - this.Rad(lng2);
var s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a/2),2) +
Math.cos(radLat1)*Math.cos(radLat2)*Math.pow(Math.sin(b/2),2)));
s = s *6378.137 ;// EARTH_RADIUS;
s = Math.round(s * 10000) / 10000; //The output is kilometers
return s;
},
// Calculate the distance rendering point
drawMarkerByDistance(zoom){
var that=this;
var perDistance=0; //Current cumulative kilometers
var zoom=zoom||10;
switch (zoom){
case 10:
var targetDistance=20 //km
break;
case 11:
var targetDistance=10; //km
break;
case 12:
var targetDistance=5; //km
break;
case 13:
var targetDistance=1; //km
break;
default:
var targetDistance=0.25; //km
}
var prepareToShowMarker=[];//Copy the obtained latitude and longitude data and perform conditional filtering
prepareToShowMarker=JSON.parse(JSON.stringify(that.mapData))
for(var i in prepareToShowMarker){
prepareToShowMarker[i].count=1
}
var select=function(arr){//Filter function
var flag=true;
for(var i=0;i<arr.length;i++){
for(var j=i+1;j<arr.length;j++){
var curdistance= that.GetDistance(arr[i].latitude,arr[i].longitude,arr[j].latitude,arr[j].longitude);
//If there are still close points
if (curdistance<targetDistance) {
flag=false;
//Fixed to delete a point
arr[i].count=arr[i].count+arr[j].count;
arr.splice(j,1)
//Randomly remove a point between i and j
//var randomNum= ();
// if(randomNum>0.5){
// arr[j].count=arr[j].count+arr[i].count;
// }else{
// arr[i].count=arr[i].count+arr[j].count;
// }
// randomNum>0.5?(i,1):(j,1);
break;
}
}
if(flag==false){
break;
}
}
// Exit recursion when the distance between all points in the array is greater than targetDistance
if (flag==false) {
select(arr);
}
}
// Filter points
select(prepareToShowMarker);
// Render loop to the map
prepareToShowMarker.forEach(function(marker){
//Point Rendering
var index=new AMap.Marker({
map: that.map,
icon: new AMap.Icon({
image: that.iconPath,
size: new AMap.Size(70, 70), //Icon size
imageSize: new AMap.Size(70, 70)
}),
position: [marker.longitude, marker.latitude],
offset: new AMap.Pixel(-13, -30),
clickable: true
});
that.mapDataMarker.push(index)
index.on('click', markerUnitClick);
//Quantity prompt
var num = new AMap.Marker({//Create alarm count
content:`<span style="color:#fff;text-align: center;">${marker.count}</span>`,
offset: new AMap.Pixel(10,-22) // Offset position relative to the base point
});
num.setMap(that.map);
num.setPosition([marker.longitude, marker.latitude]);
that.pathContentArr.push(num)
num.on('click', markerUnitClick);
function markerUnitClick(){
that.$emit('markerUnitMap',marker.id);
}
})
}
}
