import { map, isDragging } from '@/utils/map/index_old';
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import marks from '@/utils/map/marks';
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/**
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* 坐标集合的最西南角和最东北角
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* @param {*} list
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* list 是接口获取的点 的数组
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*/
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const getBound = (list) => {
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const offset = 0.005;
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let south = null;
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let west = null;
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let north = null;
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let east = null;
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for (let item of list) {
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// 排除无效经纬度
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if (item[0] == 0 && item[1] == 0) {
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continue;
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}
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if ((west && item[0] < west) || !west) {
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west = item[0] - offset;
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}
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if ((south && item[1] < south) || !south) {
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south = item[1] - offset;
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}
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if ((east && item[0] > east) || !east) {
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east = item[0] + offset;
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}
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if ((north && item[1] > north) || !north) {
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north = item[1] + offset;
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}
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}
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if (!south || !west || !north || !east) {
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return { sw: null, ne: null };
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} else {
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return { sw: [west, south], ne: [east, north] };
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}
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};
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/**
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* 根据中心点出发的半径，得到合适的地图缩放系数
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* 高德地图缩放系数每减少1，则地图展示的实际距离放大1倍
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* 高德地图缩放系数范围[3, 18]
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* @param {*} d
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*/
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const distanceToZoom = (d) => {
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let baseDis = 250,
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z = 0;
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while (baseDis < d) {
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baseDis *= 2;
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z++;
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}
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// 多余的地图缩放系数
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const x = (baseDis - d) / (baseDis / 2);
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z -= x;
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z = z < 0 ? 0 : z;
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z = 18 - z;
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z = z < 3 ? 3 : z;
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return z;
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};
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export default {
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setCenter(lnglat, ignore = false) {
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if (!ignore && isDragging) {
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return;
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}
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var now = new Date();
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if (
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this.lasttime == undefined ||
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now.getTime() - this.lasttime.getTime() >= 200
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) {
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map.setCenter(lnglat);
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this.lasttime = now;
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}
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},
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addViews(view) {
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map.add(view);
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},
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removeViews(view) {
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map.remove(view);
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},
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clearMap() {
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marks.clearMassMarks();
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map.clearMap();
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},
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setFitView(views) {
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if (views) {
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map.setFitView(views);
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} else {
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map.setFitView();
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}
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},
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setFitSector({ p, r }) {
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this.setCenter(p);
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const z = distanceToZoom(r);
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map.setZoom(z);
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},
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setBound(lnglats_GD) {
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const { sw, ne } = getBound(lnglats_GD);
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if (!sw || !ne) {
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return;
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}
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// eslint-disable-next-line no-undef
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var mybounds = new AMap.Bounds(sw, ne); // sw, ne > [xxx,xxx], [xxx,xxx]
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map.setBounds(mybounds);
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}
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};
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