如何添加一个半径的圆Bing地图? [英] How do I add a radius circle to Bing Maps?
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问题描述
我已经看到了在这里做的: http://www.somebody4u.com/Profile/Live
I've seen it done here: http://www.somebody4u.com/Profile/Live
但我不能找到一个方法来与API(AJAX)做到这一点。
but I can't find a way to do it with the api (ajax).
推荐答案
Bing地图V7不包括平局圆法。
Bing Maps V7 does not include a draw circle method.
圆已被aproximated通过绘制几个小部分。
The circle has to be "aproximated" by drawing several small segments.
var key = .....; // API access key
var MM = Microsoft.Maps;
var R = 6371; // earth's mean radius in km
var map = new Microsoft.Maps.Map(this.element[0], {credentials: key, disableKeyboardInput: true});
var radius = ...; //radius of the circle
var latitude = ...; //latitude of the circle center
var longitude = ...; //longitude of the circle center
var backgroundColor = new Microsoft.Maps.Color(10, 100, 0, 0);
var borderColor = new Microsoft.Maps.Color(150, 200, 0, 0);
var lat = (latitude * Math.PI) / 180;
var lon = (longitude * Math.PI) / 180;
var d = parseFloat(radius) / R;
var circlePoints = new Array();
for (x = 0; x <= 360; x += 5) {
var p2 = new MM.Location(0, 0);
brng = x * Math.PI / 180;
p2.latitude = Math.asin(Math.sin(lat) * Math.cos(d) + Math.cos(lat) * Math.sin(d) * Math.cos(brng));
p2.longitude = ((lon + Math.atan2(Math.sin(brng) * Math.sin(d) * Math.cos(lat),
Math.cos(d) - Math.sin(lat) * Math.sin(p2.latitude))) * 180) / Math.PI;
p2.latitude = (p2.latitude * 180) / Math.PI;
circlePoints.push(p2);
}
var polygon = new MM.Polygon(circlePoints, { fillColor: backgroundColor, strokeColor: borderColor, strokeThickness: 1 });
map.entities.push(polygon);
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