improvement(markerlayer): 支持根据缩放范围动态获取聚合数据

package.json

@@ -143,7 +143,7 @@
     "release-cdn": "antv-bin upload -n @antv/l7",
     "storybook": "start-storybook -p 6006",
     "test": "cross-env BABEL_ENV=test jest",
-    "test-live": "cross-env BABEL_ENV=test DEBUG_MODE=1 jest --watch  packages/scene/__tests__/index.spec.ts ",
+    "test-live": "cross-env BABEL_ENV=test DEBUG_MODE=1 jest --watch",
     "coveralls": "jest --coverage && cat ./tests/coverage/lcov.info | coveralls",
     "tsc": "tsc",
     "watch": "yarn clean && lerna exec --parallel -- cross-env BABEL_ENV=cjs babel --watch src --root-mode upward --out-dir lib --source-maps --extensions .ts,.tsx --delete-dir-on-start --no-comments",

packages/component/src/markerlayer.ts

@@ -1,5 +1,12 @@
 import { IMapService, IMarker, TYPES } from '@antv/l7-core';
-import { bindAll, DOM, Satistics } from '@antv/l7-utils';
+import {
+  bindAll,
+  boundsContains,
+  DOM,
+  IBounds,
+  padBounds,
+  Satistics,
+} from '@antv/l7-utils';
 import { EventEmitter } from 'eventemitter3';
 import { Container } from 'inversify';
 import { merge } from 'lodash';
@@ -39,6 +46,7 @@ export default class MarkerLayer extends EventEmitter {
   private mapsService: IMapService<unknown>;
   private scene: Container;
   private zoom: number;
+  private bbox: IBounds;
 
   constructor(option?: Partial<IMarkerLayerOption>) {
     super();
@@ -141,11 +149,7 @@ export default class MarkerLayer extends EventEmitter {
     this.clusterIndex.load(this.points);
   }
 
-  private getClusterMarker(zoom: number) {
-    // 之前的参数为  [-180, -85, 180, 85]，基本等于全地图的范围
-    // 优化后的逻辑为：
-    // 取当前视野范围 * 2，只渲染视野内 * 2 范围的点
-    const viewBounds = this.mapsService.getBounds();
+  private getClusterMarker(viewBounds: IBounds, zoom: number) {
     const viewBBox = viewBounds[0].concat(viewBounds[1]) as GeoJSON.BBox;
     const clusterPoint = this.clusterIndex.getClusters(viewBBox, zoom);
     this.clusterMarkers.forEach((marker: IMarker) => {
@@ -168,14 +172,10 @@ export default class MarkerLayer extends EventEmitter {
           const column = Satistics.getColumn(columnData as any, field);
           const stat = Satistics.getSatByColumn(method, column);
           const fieldName = 'point_' + method;
-          feature.properties[fieldName] = stat;
+          feature.properties[fieldName] = stat.toFixed(2);
         }
       }
       const marker = this.clusterMarker(feature);
-      // feature.properties && feature.properties.hasOwnProperty('point_count')
-      //   ? this.clusterMarker(feature)
-      //   : this.normalMarker(feature);
-
       this.clusterMarkers.push(marker);
       marker.addTo(this.scene);
     });
@@ -211,14 +211,15 @@ export default class MarkerLayer extends EventEmitter {
 
   private update() {
     const zoom = this.mapsService.getZoom();
-    // 在 zoom 变化的时候，通过控制触发的阈值 (0.4)，减少小层级的 zoom 变化引起的频繁重绘
-    if (zoom !== this.zoom && Math.abs(zoom - this.zoom) > 0.4) {
-      // 按照当前地图的放大层级向下取整，进行聚合点的绘制
+    const bbox = this.mapsService.getBounds();
+    if (
+      !this.bbox ||
+      Math.abs(zoom - this.zoom) >= 1 ||
+      !boundsContains(this.bbox, bbox)
+    ) {
+      this.bbox = padBounds(bbox, 0.5);
       this.zoom = Math.floor(zoom);
-      this.getClusterMarker(Math.floor(zoom));
-    } else if (zoom === this.zoom) {
-      // 如果 zoom 没有变化，只是平移，进行重新计算渲染加载s
-      this.getClusterMarker(Math.floor(zoom));
+      this.getClusterMarker(this.bbox, this.zoom);
     }
   }
 
@@ -234,14 +235,6 @@ export default class MarkerLayer extends EventEmitter {
         ? feature.properties['point_' + method] || feature.properties[field]
         : feature.properties.point_count;
     span.textContent = text;
-    // const elStyle = isFunction(style)
-    //   ? style(feature.properties.point_count)
-    //   : style;
-
-    // Object.keys(elStyle).forEach((key: string) => {
-    //   // @ts-ignore
-    //   el.style[key] = elStyle[key];
-    // });
     return el;
   }
 }

packages/utils/__tests__/geo.spec.ts

@@ -1,8 +1,39 @@
-import { aProjectFlat, lngLatToMeters, project } from '../src/geo';
-describe('aProjectFlat', () => {
-  it('aProjectFlat', () => {
-    // console.log(aProjectFlat([112, 32]));
-    // console.log(lngLatToMeters([112, 32]));
-    // console.log(project([112, 32]));
+import {
+  aProjectFlat,
+  boundsContains,
+  IBounds,
+  lngLatToMeters,
+  padBounds,
+  project,
+} from '../src/geo';
+
+describe('geo', () => {
+  it('padBounds', () => {
+    const bounds: IBounds = [
+      [112, 30],
+      [116, 34],
+    ];
+    const bounds2 = padBounds(bounds, 0.5);
+    expect(bounds2).toEqual([
+      [110, 28],
+      [118, 36],
+    ]);
+  });
+
+  it('boundContain', () => {
+    const bounds: IBounds = [
+      [112, 30],
+      [116, 34],
+    ];
+    const b2: IBounds = [
+      [113, 30],
+      [115, 33],
+    ];
+    const b3: IBounds = [
+      [110, 30],
+      [115, 33],
+    ];
+    expect(boundsContains(bounds, b2)).toEqual(true);
+    expect(boundsContains(bounds, b3)).toEqual(false);
   });
 });

packages/utils/src/geo.ts

@@ -7,6 +7,15 @@ import {
   Units,
 } from '@turf/helpers';
 
+export type IBounds = [[number, number], [number, number]];
+export interface ILngLat {
+  lng: number;
+  lat: number;
+}
+export interface IPoint {
+  x: number;
+  y: number;
+}
 const originShift = (2 * Math.PI * 6378137) / 2.0;
 export type Point = number[];
 /**
@@ -207,3 +216,26 @@ export function project(lnglat: [number, number]) {
 
   return [x, y];
 }
+
+export function padBounds(b: IBounds, bufferRatio: number): IBounds {
+  const heightBuffer = Math.abs(b[1][1] - b[0][1]) * bufferRatio;
+  const widthBuffer = Math.abs(b[1][0] - b[0][0]) * bufferRatio;
+
+  return [
+    [b[0][0] - widthBuffer, b[0][1] - heightBuffer],
+    [b[1][0] + widthBuffer, b[1][1] + heightBuffer],
+  ];
+}
+/**
+ * b1 包含 b2 返回 true 否则false
+ * @param b1 bounds1
+ * @param b2 bounds2
+ */
+export function boundsContains(b1: IBounds, b2: IBounds): boolean {
+  return (
+    b1[0][0] <= b2[0][0] &&
+    b1[0][1] <= b2[0][1] &&
+    b1[1][0] >= b2[1][0] &&
+    b1[1][1] >= b2[1][1]
+  );
+}