feat:绘制地图

ZhangXianQiang

2024-04-01 bd9cb65c8ee634f1f7bad5a69e891e3a4f46b768

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import * as THREE from 'three';
import * as d3 from 'd3';
import mapData from '@/assets/map/zigong.json';
 
 
const projection = d3.geoMercator().center([104.779307, 29.33924]).translate([0, 0, 0]);
export default class Map {
    constructor(experience) {
        this.experience = experience;
        this.scene = this.experience.scene;
        this.operationData(mapData);
    }
    operationData(jsondata) {
        this.map = new THREE.Object3D();
        // geo信息
        const features = jsondata.features;
        features.forEach((feature) => {
            // 单个省份 对象
            const province = new THREE.Object3D();
            // 地址
            province.properties = feature.properties.name;
            const coordinates = feature.geometry.coordinates;
 
            // 多个情况
            if (feature.geometry.type === "MultiPolygon") {
                coordinates.forEach((coordinate) => {
                    coordinate.forEach((rows) => {
                        const line = this.drawBoundary(rows);
                        const mesh = this.drawExtrudeMesh(rows);
                        province.add(line);
                        province.add(mesh);
                    });
                });
            }
 
            // 单个情况
            if (feature.geometry.type === "Polygon") {
                coordinates.forEach((coordinate) => {
                    const line = this.drawBoundary(coordinate);
                    const mesh = this.drawExtrudeMesh(coordinate);
                    province.add(line);
                    province.add(mesh);
                });
            }
            this.map.add(province);
            this.map.position.set(0, 0, 0);
        });
        this.scene.add(this.map);
    }
    drawBoundary(polygon) {
        const points = [];
        for (let i = 0; i < polygon.length; i++) {
            const [x, y] = projection(polygon[i]);
            points.push(new THREE.Vector3(x, -y, 0));
        }
        const lineGeometry = new THREE.BufferGeometry().setFromPoints(points);
        const lineMaterial = new THREE.LineBasicMaterial({
            color: 'yellow'
        });
 
        return new THREE.Line(lineGeometry, lineMaterial);
    }
 
    drawExtrudeMesh(polygon) {
        const shape = new THREE.Shape();
 
        for (let i = 0; i < polygon.length; i++) {
            const [x, y] = projection(polygon[i]);
 
            if (i === 0) {
                shape.moveTo(x, -y);
            }
 
            shape.lineTo(x, -y);
        }
 
        const geometry = new THREE.ExtrudeGeometry(shape, {
            depth: 0,
            bevelEnabled: false
        });
 
        const material = new THREE.MeshBasicMaterial({
            color: '#fff',
            transparent: true,
            opacity: 0.2,
        })
 
        return new THREE.Mesh(geometry, material);
    }
}