carDiv.id = "car";
var html="";
html+='
';
carDiv.innerHTML = html;
document.body.appendChild(carDiv);
carOverLay = new ol.Overlay({
position: point,
positioning: 'bottom-center',
offset:[6,-1],
element:document.getElementById('car')
mapServer.addOverlay(carOverLay);
* 根据坐标获取角度数，以正上方为0度作为参照
function getAngle(lng_a,lat_a, lng_b, lat_b){
var a = (90 - lat_b) * Math.PI / 180;
var b = (90 - lat_a) * Math.PI / 180;
var AOC_BOC = (lng_b - lng_a) * Math.PI / 180;
var cosc = Math.cos(a) * Math.cos(b) + Math.sin(a) * Math.sin(b) * Math.cos(AOC_BOC);
var sinc = Math.sqrt(1 - cosc * cosc);
var sinA = Math.sin(a) * Math.sin(AOC_BOC) / sinc;
var A = Math.asin(sinA) * 180 / Math.PI;
var res = 0;
if (lng_b > lng_a && lat_b > lat_a) res = A;
else if (lng_b > lng_a && lat_b < lat_a) res = 180 - A;
else if (lng_b < lng_a && lat_b < lat_a) res = 180 - A;
else if (lng_b < lng_a && lat_b > lat_a) res = 360 + A;
else if (lng_b > lng_a && lat_b == lat_a) res = 90;
else if (lng_b < lng_a && lat_b == lat_a) res = 270;
else if (lng_b == lng_a && lat_b > lat_a) res = 0;
else if (lng_b == lng_a && lat_b < lat_a) res = 180;
console.log(res);
res = res - 88;//减去图片默认角度
return res;
4.3 根据坐标点位获取中间距离
* 计算坐标2点之间的距离
* @param {Array} coordinates 传入坐标坐标系必须和地图坐标系一致 {[144,33],[144,37]}
* @return length
function formatLength(pointArray){
var length = 0;
if(mapServer.getView().getProjection().code_ == "EPSG:4326"){
for (var i = 0, ii = pointArray.length - 1; i < ii; ++i) {
var c1 = pointArray[i];
var c2 =pointArray[i+1];
length += ol.sphere.getDistance(c1, c2);
}else if(mapServer.getView().getProjection().code_ == "EPSG:3857"){
for (var i = 0, ii = pointArray.length - 1; i < ii; ++i) {
var c1 = pointArray[i];
var c2 =pointArray[i+1];
c1 = ol.proj.transform(c1, 'EPSG:3857', 'EPSG:4326');
c2 = ol.proj.transform(c2, 'EPSG:3857', 'EPSG:4326');
length += ol.sphere.getDistance(c1, c2);
return length;
4.4 根据距离，间距计算中间所有点位坐标
* 计算两点之间的中间点
* @param {Array} pointDoubleArray 二维数组坐标
* @param {num} cell 每个点之间的距离
function getCenterPoint(pointDoubleArray,cell){
cell = cell == undefined ? 5 : cell;
var twolength = formatLength(pointDoubleArray);
var rate = twolength/cell; //比例 默认5m/点
var step = Math.ceil(rate); //步数（向上取整）
var arr = new Array(); //定义存储中间点数组
var c1 = pointDoubleArray[0];//头部点
var c2 = pointDoubleArray[1];//尾部点
var x1 = c1.x,y1 = c1.y;
var x2 = c2.x,y2 = c2.y;
for (var i = 1;i
