// 用于设置线串所在的矢量图层样式的函数
var styleFunction = function(feature,res){
//轨迹线图形
var trackLine= feature.getGeometry();
var styles = [
new ol.style.Style({
stroke: new ol.style.Stroke({
color: '#2E8B57',
10
})
})
];
//对segments建立btree索引
let tree= Mapbox.rbush();//路段数
trackLine.forEachSegment(function(start, end) {
var dx = end[0] - start[0];
var dy = end[1] - start[1];
//计算每个segment的方向，即箭头旋转方向
let rotation = Math.atan2(dy, dx);
let geom=new ol.geom.LineString([start,end]);
let extent=geom.getExtent();
var item = {
minX: extent[0],
minY: extent[1],
maxX: extent[2],
maxY: extent[3],
geom: geom,
rotation:rotation
};
tree.insert(item);
});
//轨迹地理长度
let length=trackLine.getLength();
//像素间隔步长
let stpes=40;//像素步长间隔
//将像素步长转实际地理距离步长
let geo_steps=stpes*res;
//箭头总数
let arrowsNum=parseInt(length/geo_steps);
for(let i=1;i<arrowsNum;i++){
let arraw_coor=trackLine.getCoordinateAt(i*1.0/arrowsNum);
let tol=0.0001;//查询设置的点的容差，测试地图单位是米。如果是4326坐标系单位为度的话，改成0.0001.
let arraw_coor_buffer=[arraw_coor[0]-tol,arraw_coor[1]-tol,arraw_coor[0]+tol,arraw_coor[1]+tol];
//进行btree查询
var treeSearch = tree.search({
minX: arraw_coor_buffer[0],
minY: arraw_coor_buffer[1],
maxX: arraw_coor_buffer[2],
maxY: arraw_coor_buffer[3]
});
let arrow_rotation;
//只查询一个，那么肯定是它了，直接返回
if(treeSearch.length==1)
arrow_rotation=treeSearch[0].rotation;
else if(treeSearch.length>1){
let results=treeSearch.filter(function(item){
//箭头点与segment相交，返回结果。该方法实测不是很准，可能是计算中间结果
//保存到小数精度导致查询有点问题
// if(item.geom.intersectsCoordinate(arraw_coor))
// return true;
//换一种方案，设置一个稍小的容差，消除精度问题
let _tol=1;//消除精度误差的容差
if(item.geom.intersectsExtent([arraw_coor[0]-_tol,arraw_coor[1]-_tol,arraw_coor[0]+_tol,arraw_coor[1]+_tol]))
return true;
})
if(results.length>0)
arrow_rotation=results[0].rotation;
}
styles.push(new ol.style.Style({
geometry: new ol.geom.Point(arraw_coor),
image: new ol.style.Icon({
src: 'img/jiantou2.png',
anchor: [0.75, 0.5],
rotateWithView: true,
rotation: -arrow_rotation
})
}));
}
return styles;
}
引入算法库插件代码为：
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