[英]Draw triangle based on latitude and longitude in google map
我需要在谷歌地图中创建一条三角形折线。 但我确实只有一个纬度和经度。 因此我只是创建了随机值来在谷歌地图中创建一个形状。 但有时形状差异太大。 如何绘制一个经纬度的三角形。 我只是参考了这个链接
这是我用来在谷歌地图中绘制三角形的代码。
var geocoder = new google.maps.Geocoder();
var address = document.getElementById('valtxtaddres').value;
console.log("Address is:"+address);
if(address!=''){
geocoder.geocode( { 'address': address}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
var latitude = results[0].geometry.location.lat().toString();
var longitude = results[0].geometry.location.lng().toString();
// alert(latitude);
console.log("Lng is:"+longitude);
console.log("Math value:"+(Math.floor(Math.random()*90000) + 10000));
var triangle2Lat = latitude.slice(0, latitude.length-5)+(Math.floor(Math.random()*90000) + 10000);
var triangle2Lng = longitude.slice(0, longitude.length-11)+(Math.floor(Math.random()*90000) + 10000);
var triangle3Lat = latitude.slice(0, latitude.length-5)+(Math.floor(Math.random()*90000) + 10000);
var triangle3Lng = longitude.slice(0, longitude.length-11)+(Math.floor(Math.random()*90000) + 10000);
console.log("triangle2Lat is:"+triangle2Lat);
console.log("triangle2Lng is:"+triangle2Lng);
console.log("triangle3Lat is:"+triangle3Lat);
console.log("triangle3Lng is:"+triangle3Lng);
var triangleCoords = [
new google.maps.LatLng(latitude, longitude),
new google.maps.LatLng(triangle2Lat, triangle2Lng),
new google.maps.LatLng(triangle3Lat, triangle3Lng)
];
myPolygon = new google.maps.Polygon({
paths: triangleCoords,
draggable: true, // turn off if it gets annoying
editable: true,
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35
});
myPolygon.setMap(gmap);
}
});
}
您可以使用球面几何库绘制一个三角形,其顶点距地理编码点 250 米,朝向 0 度(北)、120 度(东南)和 -120 度(西南)。
var geocoder = new google.maps.Geocoder();
var address = document.getElementById('valtxtaddres').value;
console.log("Address is:" + address);
if (address != '') {
geocoder.geocode({
'address': address
}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
var triangle1 = google.maps.geometry.spherical.computeOffset(results[0].geometry.location, 250, 0);
var triangle2 = google.maps.geometry.spherical.computeOffset(results[0].geometry.location, 250, 120);
var triangle3 = google.maps.geometry.spherical.computeOffset(results[0].geometry.location, 250, -120);
var triangleCoords = [triangle1, triangle2, triangle3];
myPolygon = new google.maps.Polygon({
path: triangleCoords,
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35
});
myPolygon.setMap(gmap);
}
});
}
代码片段:
function initialize() { var gmap = new google.maps.Map( document.getElementById("map_canvas"), { center: new google.maps.LatLng(37.4419, -122.1419), zoom: 16, mapTypeId: google.maps.MapTypeId.ROADMAP }); var geocoder = new google.maps.Geocoder(); var address = document.getElementById('valtxtaddres').value; console.log("Address is:" + address); if (address != '') { geocoder.geocode({ 'address': address }, function(results, status) { if (status == google.maps.GeocoderStatus.OK) { var mark = new google.maps.Marker({ position: results[0].geometry.location, map: gmap, title: "C", icon: { url: "https://maps.gstatic.com/intl/en_us/mapfiles/markers2/measle.png", size: new google.maps.Size(7, 7), anchor: new google.maps.Point(3.5, 3.5) } }); var triangle1 = google.maps.geometry.spherical.computeOffset(results[0].geometry.location, 250, 0); var triangle2 = google.maps.geometry.spherical.computeOffset(results[0].geometry.location, 250, 120); var triangle3 = google.maps.geometry.spherical.computeOffset(results[0].geometry.location, 250, -120); console.log("triangle1 is:" + triangle1.toUrlValue(6)); console.log("triangle2 is:" + triangle2.toUrlValue(6)); console.log("triangle3 is:" + triangle3.toUrlValue(6)); var triangleCoords = [triangle1, triangle2, triangle3]; myPolygon = new google.maps.Polygon({ path: triangleCoords, // draggable: true, // turn off if it gets annoying // editable: true, strokeColor: '#FF0000', strokeOpacity: 0.8, strokeWeight: 2, fillColor: '#FF0000', fillOpacity: 0.35 }); myPolygon.setMap(gmap); } }); } } google.maps.event.addDomListener(window, "load", initialize);
html, body { height: 100%; width: 100%; margin: 0px; padding: 0px } #map_canvas { height: 90%; width: 100%; }
<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry&key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script> <input id="valtxtaddres" value="Palo Alto, CA" /> <div id="map_canvas"></div>
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