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/* Copyright© 2000 - 2018 SuperMap Software Co.Ltd. All rights reserved.
* This program are made available under the terms of the Apache License, Version 2.0
* which accompanies this distribution and is available at http://www.apache.org/licenses/LICENSE-2.0.html.*/
/**
* reference and modification
* maptalks.three
* (https://github.com/maptalks/maptalks.three)
* Apache Licene 2.0
* thanks maptalks
*/
import * as THREE from "three";
import mapboxgl from "mapbox-gl";
import {Transform, ThreeLayerRenderer} from "./threejs";
const {
Vector3,
Shape,
Mesh,
BufferGeometry,
ExtrudeGeometry
} = THREE;
/**
* @class mapboxgl.supermap.ThreeLayer
* @category Visualization Three
* @classdesc Three 图层。
* @param {string} id - 图层 ID。
* @param {string} [renderer="gl"] - 图层渲染方式( canvas 或 WebGL )。取值："gl","canvas"。
* @param {object} options - 初始化参数。
* @param {object} options.threeOptions - threejs 渲染器初始化参数对象。参数内容详见:
* [WebGLRenderer]{@link https://threejs.org/docs/index.html#api/renderers/WebGLRenderer}
* [CanvasRenderer]{@link https://threejs.org/docs/index.html#examples/renderers/CanvasRenderer}
*
* @extends {mapboxgl.Evented}
* @fires mapboxgl.supermap.ThreeLayer#render
* @fires mapboxgl.supermap.ThreeLayer#renderscene
* @example
* var threeLayer = new mapboxgl.supermap.ThreeLayer('three');
* //模型绘制
* threeLayer.on("initialized", draw);
* threeLayer.addTo(map);
*
* function draw() {
* var scene=threeLayer.getScene();
* camera=threeLayer.getCamera();
* var light = new THREE.PointLight(0xffffff);
* camera.add(light);
* var material = new THREE.MeshPhongMaterial({color: 0xff0000});
* //根据坐标点转换成模型
* var mesh = this.toThreeMesh(feature.geometry.coordinates, 10, material, true);
* //模型添加到3D场景
* scene.add(mesh);
* }
*
* 叠加模型可以通过两种方式：</br>
* 1.调用 threeLayer.toThreeMesh 直接将地理坐标转换成 threejs 3D 模型（适用于挤压模型，如城市建筑），然后添加到 3D 场景
* 2.使用 ThreeJS 的接口创建好 Mesh,然后调用 threeLayer.setPosition 设置地理位置，然后添加到 3D 场景
*
*/
export class ThreeLayer extends mapboxgl.Evented {
//options.threeOptions是初始化threejs renderer的参数对象
constructor(id, renderer, options) {
super();
this._layerId = id;
this.options = options;
let threeOptions = options && options.threeOptions;
this.renderer = new ThreeLayerRenderer(this, renderer, threeOptions);
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.toThreeShape
* @description 创建 threejs shape 对象。
* @param {Array} coordinates - 坐标点数组。
* @returns THREE.Shape{@link https://threejs.org/docs/index.html#api/extras/core/Shape} threejs shape 对象。
*/
toThreeShape(coordinates) {
if (!coordinates) {
return null;
}
let center = this.getCoordinatesCenter(coordinates);
let centerPoint = this.lngLatToPosition(center);
let outer = coordinates.map(coords => this.lngLatToPosition({
lng: coords[0],
lat: coords[1]
}).sub(centerPoint));
return new Shape(outer);
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.toThreeMesh
* @description 创建 threejs Mesh 对象。将地理坐标转换成 threejs 3D 模型（适用于挤压模型，如城市建筑）。
* @param {Array.<Object>} coordinates - 坐标点数组。
* @param {number} amount - 高度。
* @param {THREE.Material} material - Threejs 材质对象。参考：[THREE.Material]{@link https://threejs.org/docs/index.html#api/extras/core/Material}
* @param {boolean} [removeDuplicated] - 是否移除重复的坐标点。
* @returns {THREE.Mesh} threejs Mesh 对象。参考：[THREE.Mesh]{@link https://threejs.org/docs/index.html#api/objects/Mesh}
*/
toThreeMesh(coordinates, amount, material, removeDuplicated) {
if (!coordinates) {
return null;
}
let coords = coordinates;
if (removeDuplicated) {
coords = this.removeDuplicatedCoordinates(coordinates)
}
let targetAmount = this.distanceToThreeVector3(amount, amount).x;
let shape = this.toThreeShape(coords);
let geometry = new ExtrudeGeometry(shape, {
'amount': targetAmount,
'bevelEnabled': true
});
let bufferGeometry = new BufferGeometry().fromGeometry(geometry);
let mesh = new Mesh(bufferGeometry, material);
let center = this.lngLatToPosition(this.getCoordinatesCenter(coords));
mesh.position.set(center.x, center.y, -targetAmount);
return mesh;
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.addObject
* @description 设置threejs 3D 对象的坐标（经纬度）。
* @param {THREE.Object3D} object3D - threejs 3D 对象。参考：[THREE.Object3D]{@link https://threejs.org/docs/index.html#api/core/Object3D}及子类对象。
* @param {(Array.<number>|Object)} coordinate - 添加的 three 对象坐标（经纬度）。
* @returns {this} this
*/
addObject(object3D, coordinate) {
if (coordinate && object3D) {
this.setPosition(object3D, coordinate);
}
this.renderer && this.renderer.scene.add(object3D);
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.getScene
* @description 获取threejs 场景对象
* @returns {THREE.Scene} threejs 场景对象,参考：[THREE.Scene]{@link https://threejs.org/docs/index.html#api/scenes/Scene}
*/
getScene() {
return this.renderer.scene;
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.getCamera
* @description 获取threejs 相机。
* @returns {THREE.Camera} threejs 相机。参考：[THREE.Camera]{@link https://threejs.org/docs/index.html#api/cameras/Camera}
*/
getCamera() {
return this.renderer.camera;
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.getThreeRenderer
* @description 获取 threejs renderer。
* @returns {THREE.WebGLRenderer|THREE.CanvasRenderer} threejs renderer。参考：
* [THREE.WebGLRenderer]{@link https://threejs.org/docs/index.html#api/renderers/WebGLRenderer}/
* [THREE.CanvasRenderer]{@link https://threejs.org/docs/index.html#examples/renderers/CanvasRenderer}
*/
getThreeRenderer() {
return this.renderer.context;
}
// /**
// * @function mapboxgl.supermap.ThreeLayer.prototype.getObject
// * @description 根据条件获取添加到场景中的对象
// * @return {THREE.Object3D} threejs 3D对象。参考：[THREE.Object3D]{@link https://threejs.org/docs/index.html#api/core/Object3D}及子类对象
// */
// getObject(conditions) {
// if(!conditions){
// return;
// }
// var scene = this.getScene();
// var objects = scene.children;
// for(let obj of objects ){
// for(let condition of conditions ){
// obj[condition]
// }
// }
// }
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.clearMesh
* @description 清除所有 threejs mesh 对象。
* @returns {this} this 对象。
*/
clearMesh() {
let scene = this.renderer.scene;
if (!scene) {
return this;
}
for (let i = scene.children.length - 1; i >= 0; i--) {
if (scene.children[i] instanceof THREE.Mesh) {
scene.remove(scene.children[i]);
}
}
return this;
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.clearAll
* @description 清除所有 threejs 对象。
* @param {boolean} clearCamera - 是否同时清除相机。
* @returns {this} this 对象。
*/
clearAll(clearCamera) {
let scene = this.renderer.scene;
if (!scene) {
return this;
}
for (let i = scene.children.length - 1; i >= 0; i--) {
if (!clearCamera && scene.children[i] instanceof THREE.Camera) {
continue;
}
scene.remove(scene.children[i]);
}
return this;
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.setPosition
* @description 设置 threejs 3D 对象的坐标（经纬度）。
* @param {THREE.Object3D} object3D - threejs 3D 对象，参考：[THREE.Object3D]{@link https://threejs.org/docs/index.html#api/core/Object3D}及子类对象。
* @param {(Array.<number>|Object)} coordinate - 添加的 three 对象坐标（经纬度）。
* @returns {this} this 对象。
*/
setPosition(object3D, coordinate) {
if (!object3D || !coordinate) {
return this;
}
var pos = this.lngLatToPosition(coordinate);
object3D.position.set(pos.x, pos.y, pos.z);
return this;
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.lngLatToPosition
* @description 经纬度转threejs 3D 失量对象。
* @param {(Array.<number>|Object)} lngLat - 经纬度坐标。
* @returns {THREE.Vector3} threejs 3D 失量对象。参考：[THREE.Vector3]{@link https://threejs.org/docs/index.html#api/math/Vector3}
*/
lngLatToPosition(lngLat) {
let zoom = Transform.projection.nativeMaxZoom;
let point = Transform.lngLatToPoint(lngLat, zoom);
return new Vector3(point.x, point.y, -0);
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.distanceToThreeVector3
* @description 计算距离指定坐标给定距离的新坐标的 threejs 3D 失量对象。
* @param {number} x - x 轴距离,单位米。
* @param {number} y - y 轴距离,单位米。
* @param {(Array.<number>|Object)} lngLat - 源坐标。
* @returns {THREE.Vector3} 目标点的 threejs 3D 失量对象。参考：[THREE.Vector3]{@link https://threejs.org/docs/index.html#api/math/Vector3}
*/
distanceToThreeVector3(x, y, lngLat) {
let map = this._map;
let center = lngLat || map.getCenter(),
maxZoom = Transform.projection.nativeMaxZoom,
targetLngLat = Transform.locate(center, x, y);
let point1 = Transform.lngLatToPoint(center, maxZoom),
point2 = Transform.lngLatToPoint(targetLngLat, maxZoom);
let targetX = Math.abs(point2.x - point1.x) * Math.sign(x);
let targetY = Math.abs(point2.y - point1.y) * Math.sign(y);
return new Vector3(targetX, targetY, 0);
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.removeDuplicatedCoordinates
* @description 移除数组中的重复坐标。
* @param {(Array.<Array.<number>>)} coordinates - 坐标数组。
* @returns {(Array.<Array.<number>>)} 新的坐标数组。
*/
removeDuplicatedCoordinates(coordinates) {
function equals(point1, point2) {
return point1[0] === point2[0] && point1[1] === point2[1]
}
let coords = [].concat(coordinates);
let length = coords.length;
for (let i = length - 1; i >= 1; i--) {
if (equals(coords[i], coords[i - 1])) {
coords.splice(i, 1);
}
}
let isClose = equals(coords[0], coords[coords.length - 1]);
isClose && coords.splice(coords.length - 1, 1);
return coords;
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.getCoordinatesCenter
* @description 获取给定坐标数组的中心坐标。
* @param {(Array.<Array.<number>>)} coordinates - 坐标数组。
* @returns {Object} 包含经纬度的坐标对象。
*/
getCoordinatesCenter(coordinates) {
let sumX = 0, sumY = 0, count = 0;
let i = 0, len = coordinates.length;
for (; i < len; i++) {
if (coordinates[i]) {
sumX += coordinates[i][0];
sumY += coordinates[i][1];
count++;
}
}
return {
lng: sumX / count,
lat: sumY / count
};
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.addTo
* @description 添加图层到地图。
* @param {Object} map - 地图对象。
* @returns {this} this 对象。
*/
addTo(map) {
var me = this;
me._map = map;
me.renderer.setMap(map);
me.renderer.render();
//three mbgl 联动(仅联动相机,不执行重绘操作)
me._map.on('render', this._update.bind(me));
me._map.on('resize', this._resize.bind(me));
me.on('render', (function () {
this.context && this.context.render(this.scene, this.camera);
}).bind(me.renderer));
return this;
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.getCanvasContainer
* @description 获取 three 图层容器。
* @returns {HTMLElement} three 图层的容器。
*/
getCanvasContainer() {
return this.renderer.getCanvasContainer();
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.getCanvas
* @description 获取 three 图层画布。
* @returns {HTMLCanvasElement} three 图层画布。
*/
getCanvas() {
return this.renderer.getCanvas();
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.remove
* @description 移除图层。
*/
remove() {
let map = this._map, me = this;
map.off('render', me._update.bind(me));
map.off('resize', me._resize.bind(me));
me.renderer.remove();
me._map = null;
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.draw
* @description 提供给外部的 threejs 模型绘制接口。
* @param {THREE.WebGLRenderer|THREE.CanvasRenderer} gl - threejs 渲染器上下文 。详情请参考：</br>
* [WebGLRenderer]{@link https://threejs.org/docs/index.html#api/renderers/WebGLRenderer}/
* [CanvasRenderer]{@link https://threejs.org/docs/index.html#examples/renderers/CanvasRenderer}
* @param {THREE.Scene} scene - threejs 场景对象。详情请参考：[THREE.Scene]{@link https://threejs.org/docs/index.html#api/scenes/Scene}
* @param {THREE.Camera} camera - threejs 相机对象。详情请参考：[THREE.Camera]{@link https://threejs.org/docs/index.html#api/cameras/Camera}
* @returns {this} this对象。
* @example
* var threeLayer = new mapboxgl.supermap.ThreeLayer('three');
* //可以通过重写 draw 实现模型绘制
* threeLayer.draw = function (gl, scene, camera) {
* //TODO 绘制操作
* }
* threeLayer.addTo(map);
*/
draw(gl, scene, camera) {// eslint-disable-line no-unused-vars
return this;
}
/**
* @function mapboxgl.supermap.ThreeLayer.prototype.renderScene
* @description 渲染场景。
* @returns {this} this
*/
renderScene() {
this.renderer.renderScene();
/**
* @event mapboxgl.supermap.ThreeLayer#renderscene
* @description renderScene 事件，场景渲染后触发。
*/
this.fire("renderscene");
return this;
}
_resize() {
this.renderer.resize();
}
_update() {
/**
* @event mapboxgl.supermap.ThreeLayer#render
* @description render 事件，地图渲染时(地图状态改变时)触发。
*/
this.renderScene();
this.fire('render');
return this;
}
}
mapboxgl.supermap.ThreeLayer = ThreeLayer;