效果展示
原始数据
const routeFeature = { type: "Feature", geometry: { type: "LineString", coordinates: [ [105.9420397836494, 27.911864399055588, 0.0], [105.94204506457491, 27.911868653873896, 0.0], [105.94203985374624, 27.911863549317346, 0.0], [105.9894250218576, 28.057236450358882, 0.0], [106.10215274353018, 28.284607012841803, 0.0], [106.07371540920602, 28.280436458801173, 0.0], [106.07873615012684, 28.28931130115016, 0.0], [106.05978977915458, 28.29067898838156, 0.0], [106.01532125560543, 28.29250735826644, 0.0], [106.11251696408775, 28.335110012326794, 0.0], [106.07311049420407, 28.334906534881487, 0.0], [106.02507910445651, 28.336362174118438, 0.0], [106.02489694766722, 28.359663055160034, 0.0], [106.01964893419249, 28.36218521264283, 0.0], [106.02051116393352, 28.363011171722473, 0.0], [106.02205644084118, 28.363104546940434, 0.0], [106.02162537170554, 28.362978005991447, 0.0], [106.06032150948916, 28.372102355412082, 0.0], [106.04706634723237, 28.410958515915414, 0.0], [106.16865262249493, 28.364800431812483, 0.0], [106.15259292905644, 28.30510828317908, 0.0], ], }, }; export{ routeFeature }
起点/终点寻找
const coordinates = routeFeature.geometry.coordinates; let start = coordinates[0].slice(0, 2), end = coordinates[coordinates.length - 1].slice(0, 2);
起点和终点样式函数
function styleFn(text) { return new Style({ image: new Icon({ src: mark, scale: 1, }), text: new Text({ textAlign: "center", textBaseline: "middle", font: "normal 14px 微软雅黑", text, fill: new Fill({ color: "#aa3300" }), stroke: new Stroke({ color: "#ffcc33", width: 2 }), offsetX: 0, scale: 1, offsetY: 0, }), }); }
起点和终点layer创建函数
const Mark = (point, name) => { return new VectorLayer({ style: styleFn(name), source: new VectorSource({ features: [ new Feature({ geometryName: "centerMark", geometry: new Point(point), }), ], }), }); };
路线feature创建
var lineFeature = new GeoJSON({ geometryName: "line", }).readFeature(routeFeature.geometry); const polyLineLayer = new VectorLayer({ source: new VectorSource({ features: [lineFeature], }), style: styleFunction, });
路线样式函数
function styleFunction(featrue, resolution) { var geometry = featrue.getGeometry(); var length = geometry.getLength(); //获取线段长度 var radio = (100 * resolution) / length; var dradio = 10000; //投影坐标系,如EPSG3857设置dradio=1,在EPSG:4326下可以设置dradio=10000,其他坐标系可以调整 var styles = [ new Style({ stroke: new Stroke({ color: "green", width: 10, }), }), ]; for (var i = 0; i <= 1; i += radio) { var arrowLocation = geometry.getCoordinateAt(i); geometry.forEachSegment(function (start, end) { if (start[0] == end[0] || start[1] == end[1]) return; var dx1 = end[0] - arrowLocation[0]; var dy1 = end[1] - arrowLocation[1]; var dx2 = arrowLocation[0] - start[0]; var dy2 = arrowLocation[1] - start[1]; if (dx1 != dx2 && dy1 != dy2) { if (Math.abs(dradio * dx1 * dy2 - dradio * dx2 * dy1) < 0.001) { var dx = end[0] - start[0]; var dy = end[1] - start[1]; var rotation = Math.atan2(dy, dx); styles.push( new Style({ geometry: new Point(arrowLocation), image: new Icon({ size: toSize([13, 7]), src: arrow, anchor: [0.5, 0.5], rotateWithView: false, rotation: -rotation + (Math.PI * 3) / 2, //旋转角度可能跟图标角度有关,自行调整 }), }) ); } } }); } return styles; }
初始化地图生成线路图
export default { name: "arrowMap", data() { return { map: null, }; }, mounted() { let map = new Map({ // 设置地图图层 layers: [ gaodeMapLayer, polyLineLayer, Mark(start, "起点"), Mark(end, "终点"), ], // 设置显示地图的视图 view: new View({ center: start, zoom: 10, minZoom: 2, maxZoom: 18, projection: "EPSG:4326", rotation: 0, }), // 让id为map的div作为地图的容器 target: "arrowMap", }); }, };
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