1. 这个不觉明历。在我看来，这和 boxs 那个例子差不多。
2. 只不过扩展类 TestBoxs 继承了 maptalks.MergedMixin ，这个估计要看源码才能明白是啥了。
1 class TestBoxs extends maptalks.MergedMixin(maptalks.BaseObject) {
2 constructor(points, options, material, layer) {
3 if (!Array.isArray(points)) {
4 points = [points];
5 }
6 const len = points.length;
7 const center = getCenterOfPoints(points);
8 const centerPt = layer.coordinateToVector3(center);
9 const geometries = [], bars = [], geometriesAttributes = [], faceMap = [];
10 let faceIndex = 0, psIndex = 0, normalIndex = 0, uvIndex = 0;
11 for (let i = 0; i < len; i++) {
12 const opts = maptalks.Util.extend({ index: i }, OPTIONS1, points[i]);
13 const { radius, altitude, topColor, bottomColor, height, coordinate } = opts;
14 const r = layer.distanceToVector3(radius, radius).x;
15 const h = layer.distanceToVector3(height, height).x;
16 const alt = layer.distanceToVector3(altitude, altitude).x;
17 const buffGeom = defaultGeometry.clone();
18 buffGeom.scale(r * 2, r * 2, h);
19 const v = layer.coordinateToVector3(coordinate).sub(centerPt);
20 const parray = buffGeom.attributes.position.array;
21 for (let j = 0, len1 = parray.length; j < len1; j += 3) {
22 parray[j + 2] += alt;
23 parray[j] += v.x;
24 parray[j + 1] += v.y;
25 parray[j + 2] += v.z;
26 }
27 const position = buffGeom.attributes.position;
28 const normal = buffGeom.attributes.normal;
29 const uv = buffGeom.attributes.uv;
30 const index = buffGeom.index;
31 geometries.push({
32 position: position.array,
33 normal: normal.array,
34 uv: uv.array,
35 indices: index.array
36 });
37 const bar = new TestBox(coordinate, opts, material, layer);
38 bars.push(bar);
39
40 const faceLen = buffGeom.index.count / 3;
41 faceMap[i] = [faceIndex + 1, faceIndex + faceLen];
42 faceIndex += faceLen;
43
44 const psCount = buffGeom.attributes.position.count,
45 // colorCount = buffGeom.attributes.color.count,
46 normalCount = buffGeom.attributes.normal.count, uvCount = buffGeom.attributes.uv.count;
47 geometriesAttributes[i] = {
48 position: {
49 count: psCount,
50 start: psIndex,
51 end: psIndex + psCount * 3,
52 },
53 normal: {
54 count: normalCount,
55 start: normalIndex,
56 end: normalIndex + normalCount * 3,
57 },
58 // color: {
59 // count: colorCount,
60 // start: colorIndex,
61 // end: colorIndex + colorCount * 3,
62 // },
63 uv: {
64 count: uvCount,
65 start: uvIndex,
66 end: uvIndex + uvCount * 2,
67 },
68 hide: false
69 };
70 psIndex += psCount * 3;
71 normalIndex += normalCount * 3;
72 // colorIndex += colorCount * 3;
73 uvIndex += uvCount * 2;
74 }
75 super();
76 options = maptalks.Util.extend({}, { altitude: 0, layer, points }, options);
77 this._initOptions(options);
78 const geometry = maptalks.MergeGeometryUtil.mergeBufferGeometries(geometries);
79 this._createMesh(geometry, material);
80 const altitude = options.altitude;
81 const z = layer.distanceToVector3(altitude, altitude).x;
82 const v = centerPt.clone();
83 v.z = z;
84 this.getObject3d().position.copy(v);
85
86 this._faceMap = faceMap;
87 this._baseObjects = bars;
88 this._datas = points;
89 this._geometriesAttributes = geometriesAttributes;
90 this.faceIndex = null;
91 this._geometryCache = geometry.clone();
92 this.isHide = false;
93 this._colorMap = {};
94 this._initBaseObjectsEvent(bars);
95 this._setPickObject3d();
96 this._init();
97 }
98
99 // eslint-disable-next-line no-unused-vars
100 identify(coordinate) {
101 return this.picked;
102 }
103 }
3. 页面显示
4. 源码地址
https://github.com/WhatGIS/maptalkMap/tree/main/threelayer/demo
发表评论