我想确定是否在Bing地图上的绘制多边形内找到给定点（纬度和经度）。多边形由用户绘制。
这就是我已经拥有的
<script type='text/javascript'>
var map, drawingManager;
function GetMap() {
map = new Microsoft.Maps.Map('#myMap', {});
//Load the DrawingTools module
Microsoft.Maps.loadModule('Microsoft.Maps.DrawingTools', function () {
//Create an instance of the DrawingTools class and bind it to the map.
var tools = new Microsoft.Maps.DrawingTools(map);
//Show the drawing toolbar and enable editing on the map.
tools.showDrawingManager(function (manager) {
//Store a reference to the drawing manager as it will be useful later.
drawingManager = manager;
//Create a shortcut to the DrawingBarAction to minimize code.
var da = Microsoft.Maps.DrawingTools.DrawingBarAction;
//Limit which tools appear in the drawing toolbar.
manager.setOptions({
drawingBarActions: da.polyline | da.polygon | da.erase,
fillColor: 'rgba(255, 0, 0, 0.5)'
});
});
});
}
function IsPointInPolygon() {
var shapes = drawingManager.getPrimitives();
if (shapes && shapes.length > 0) {
for (i = 0; i < shapes.length; i++) {
var points = shapes[i].getLocations();
//Get all locations from DB
$.ajax({
url: 'http://localhost:53851/Locations/ReturnLocationsList',
type: 'POST',
dataType: 'json',
success: function (response) {
//do something with data
//alert(JSON.stringify(response.data));
arrayLocations = response.data;
//alert(arrayLocations.length);
var columns = ['IdLocation', 'Name', 'Latitude', 'Longitude'];
//Convert gotten locations to Maps.Locations in order to ease calculations
var allLocations = [];
alert("are you here ?");
for (i = 0; i < arrayLocations.length; i++) {
var coordinates = new Microsoft.Maps.Location(arrayLocations[i].Latitude, arrayLocations[i].Longitude);
allLocations.push(coordinates);
}
alert(allLocations[0]);
//Add pushpin to each location coming from DB
var pinLocation = new Microsoft.Maps.Pushpin(origin, {
color: 'blue'
});
for (i = 0; i < allLocations.length; i++) {
map.entities.push(pinLocation);
if (pointInPolygon(points, allLocations[i].Latitude, allLocations[i].Longitude)) {
alert("Point is inside polygon");
}
else {
alert("Point is not found in polygon");
}
}
function pointInPolygon(points, lat, lng) {
// ray-casting algorithm based on
// http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
var inside = false;
for (var i = 0, j = points.length - 1; i < points.length; j = i++) {
var intersect =
points[i].latitude > lat != points[j].latitude > lat &&
lng <
((points[j].longitude - points[i].longitude) *
(lat - points[i].latitude)) /
(points[j].latitude - points[i].latitude) +
points[i].longitude;
if (intersect) inside = !inside;
}
return inside;
}
},
error: function (error) {
//log or alert the error
alert("There's an error !");
//alert(error);
}
});
}
//return locations;
} else {
alert("No shapes in the drawing manager.");
}
}
</script>
<script type='text/javascript' src='https://www.bing.com/api/maps/mapcontrol?callback=GetMap&key=[Bing Map key]' async defer></script><div class="row">
<div class="col-lg-12">
<div id="myMap" style="position:relative;width:950px;height:500px;"></div>
<input type="button" class="btn btn-primary" value="Get Shapes" onclick="IsPointInPolygon()" />
</div>
</div>arrayLocations是实际来自数据库的位置，并且在这些位置中至少有一个位于绘制的多边形区域中，但我确实得到了所有位置的“多边形中找不到点”消息。
我甚至尝试将图钉添加到来自数据库的每个位置，但图钉不会显示在地图上。
我完全迷失了。请帮忙！
看来你从官方文档中改编了Polygon Search algorithm，对吗？如果是这样，他们的实施似乎是错误的，并没有按预期工作。
相反，我建议使用以下一个来确定该点是否实际上在多边形内：
function pointInPolygon(points, lat, lng) {
// ray-casting algorithm based on
// http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
var inside = false;
for (var i = 0, j = points.length - 1; i < points.length; j = i++) {
var intersect =
points[i].latitude > lat != points[j].latitude > lat &&
lng <
((points[j].longitude - points[i].longitude) *
(lat - points[i].latitude)) /
(points[j].latitude - points[i].latitude) +
points[i].longitude;
if (intersect) inside = !inside;
}
return inside;
}
演示
var map, drawingManager, point;
function GetMap() {
map = new Microsoft.Maps.Map("#myMap", {});
point = map.getCenter();
var pin = new Microsoft.Maps.Pushpin(point, {
title: "Center point"
});
map.entities.push(pin);
//Load the DrawingTools module
Microsoft.Maps.loadModule("Microsoft.Maps.DrawingTools", function() {
//Create an instance of the DrawingTools class and bind it to the map.
var tools = new Microsoft.Maps.DrawingTools(map);
//Show the drawing toolbar and enable editing on the map.
tools.showDrawingManager(function(manager) {
//Store a reference to the drawing manager as it will be useful later.
drawingManager = manager;
//Create a shortcut to the DrawingBarAction to minimize code.
var da = Microsoft.Maps.DrawingTools.DrawingBarAction;
//Limit which tools appear in the drawing toolbar.
manager.setOptions({
drawingBarActions: da.polyline | da.polygon | da.erase,
fillColor: "rgba(255, 0, 0, 0.5)"
});
});
});
}
function getShapes() {
var shapes = drawingManager.getPrimitives();
if (shapes && shapes.length > 0) {
for (i = 0; i < shapes.length; i++) {
var points = shapes[i].getLocations();
if (pointInPolygon(points, point.latitude, point.longitude)) {
alert("Point is inside polygon");
} else {
alert("Point is not found in polygon");
}
}
//return locations;
} else {
alert("No shapes in the drawing manager.");
}
}
function pointInPolygon(points, lat, lng) {
// ray-casting algorithm based on
// http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
var inside = false;
for (var i = 0, j = points.length - 1; i < points.length; j = i++) {
var intersect =
points[i].latitude > lat != points[j].latitude > lat &&
lng <
((points[j].longitude - points[i].longitude) *
(lat - points[i].latitude)) /
(points[j].latitude - points[i].latitude) +
points[i].longitude;
if (intersect) inside = !inside;
}
return inside;
}<div id="myMap" style="position:relative;width:640px;height:320px;"></div>
<input type="button" class="btn btn-primary" value="Get Shapes" onclick="getShapes()" />
<script
type="text/javascript"
src="https://www.bing.com/api/maps/mapcontrol?key=Ap12Gwv9esg5iXgfAh5Ehlbf36MZ-O8051Sl66Zm6glGwq7PSaaKgGPpcOUEGICy&callback=GetMap"
async
defer
></script>