draw routes
This commit is contained in:
Evan Scamehorn
553
src/main.js
553
src/main.js
@@ -3,302 +3,375 @@ import { MapControls } from 'three/addons/controls/MapControls.js';
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import * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';
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// ==========================================
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// 1. Configuration & Constants
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// 1. Configuration
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// ==========================================
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const SETTINGS = {
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colors: {
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background: 0xe0e0e0, // Lighter fog
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ground: 0xdddddd,
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building: 0xffffff,
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water: 0x4fa4e4,
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park: 0x98d98e,
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background: 0xE6E6E6,
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ground: 0xDDDDDD,
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building: 0xFFFFFF,
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water: 0xAADAFF,
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park: 0xC3E6CB,
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road: 0x999999,
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sun: 0xffffff,
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ambient: 0x777777,
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pathStart: 0x00FF00,
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pathEnd: 0xFF0000,
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route: 0x2563EB,
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},
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camera: {
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fov: 45, // Narrower FOV for better city look
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near: 1,
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far: 20000,
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initialPos: { x: 0, y: 600, z: 800 }
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},
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shadows: {
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enabled: true,
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mapSize: 4096,
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areaSize: 1500,
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bias: -0.0001
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},
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dataUrl: './city_data.json'
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files: {
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visual: './city_data.json',
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routing: './routing_graph.json'
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}
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};
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let scene, camera, renderer, controls, sunLight;
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let scene, camera, renderer, controls, raycaster;
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let mouse = new THREE.Vector2();
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let routingData = null;
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let cityData = null;
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// ==========================================
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// 2. Initialization
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// ==========================================
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// Interaction State
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let startNode = null;
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let endNode = null;
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let markers = { start: null, end: null, pathMesh: null };
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function init() {
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setupScene();
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setupLighting();
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createGround();
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setupControls();
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loadCityData();
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setupInteractions();
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Promise.all([
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fetch(SETTINGS.files.visual).then(r => r.json()),
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fetch(SETTINGS.files.routing).then(r => r.json())
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]).then(([visual, routing]) => {
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cityData = visual;
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routingData = routing;
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renderCity(cityData);
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prepareGraph(routingData); // This now fixes the coordinates!
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});
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window.addEventListener('resize', onWindowResize);
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animate();
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}
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// ==========================================
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// 2. Data Preparation & Coordinate Fix
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// ==========================================
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function prepareGraph(data) {
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// We must FLIP the Y coordinate of the graph data to -Z
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// because our visual map is rotated -90deg on the X axis.
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data.adjacency = {};
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// 1. Fix Nodes
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for (let key in data.nodes) {
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data.nodes[key].y = -data.nodes[key].y; // FLIP Y to Negative
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}
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// 2. Fix Edges
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data.edges.forEach((edge, index) => {
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// Flip geometry points
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if (edge.points) {
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edge.points.forEach(p => { p[1] = -p[1]; });
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}
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// Build Adjacency List
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if (!data.adjacency[edge.u]) data.adjacency[edge.u] = [];
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data.adjacency[edge.u].push({
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to: edge.v,
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cost: edge.length || 1,
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edgeIndex: index
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});
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if (!edge.oneway) {
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if (!data.adjacency[edge.v]) data.adjacency[edge.v] = [];
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data.adjacency[edge.v].push({
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to: edge.u,
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cost: edge.length || 1,
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edgeIndex: index,
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isReverse: true
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});
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}
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});
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}
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// ==========================================
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// 3. Scene Setup
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// ==========================================
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function setupScene() {
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scene = new THREE.Scene();
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scene.background = new THREE.Color(SETTINGS.colors.background);
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scene.fog = new THREE.FogExp2(SETTINGS.colors.background, 0.0001);
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scene.fog = new THREE.FogExp2(SETTINGS.colors.background, 0.0002);
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camera = new THREE.PerspectiveCamera(
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SETTINGS.camera.fov,
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window.innerWidth / window.innerHeight,
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SETTINGS.camera.near,
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SETTINGS.camera.far
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);
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camera.position.set(
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SETTINGS.camera.initialPos.x,
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SETTINGS.camera.initialPos.y,
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SETTINGS.camera.initialPos.z
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);
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camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 20000);
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camera.position.set(0, 800, 800);
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renderer = new THREE.WebGLRenderer({
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antialias: true,
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logarithmicDepthBuffer: true
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});
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renderer = new THREE.WebGLRenderer({ antialias: true, logarithmicDepthBuffer: true });
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renderer.setSize(window.innerWidth, window.innerHeight);
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renderer.shadowMap.enabled = SETTINGS.shadows.enabled;
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renderer.shadowMap.type = THREE.PCFSoftShadowMap;
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renderer.shadowMap.enabled = true;
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document.body.appendChild(renderer.domElement);
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}
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/**
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* Creates ambient and directional lighting.
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* Configures shadow properties for the directional light.
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*/
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function setupLighting() {
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const ambient = new THREE.HemisphereLight(SETTINGS.colors.sun, SETTINGS.colors.ground, 0.6);
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const ambient = new THREE.HemisphereLight(0xffffff, 0x555555, 0.7);
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scene.add(ambient);
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sunLight = new THREE.DirectionalLight(SETTINGS.colors.sun, 2.0);
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sunLight.position.set(100, 500, 200);
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sunLight.castShadow = true;
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const dirLight = new THREE.DirectionalLight(0xffffff, 1.5);
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dirLight.position.set(500, 1000, 500);
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dirLight.castShadow = true;
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dirLight.shadow.mapSize.set(2048, 2048);
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dirLight.shadow.camera.left = -1500;
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dirLight.shadow.camera.right = 1500;
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dirLight.shadow.camera.top = 1500;
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dirLight.shadow.camera.bottom = -1500;
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scene.add(dirLight);
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sunLight.shadow.mapSize.set(SETTINGS.shadows.mapSize, SETTINGS.shadows.mapSize);
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const d = SETTINGS.shadows.areaSize;
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sunLight.shadow.camera.left = -d;
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sunLight.shadow.camera.right = d;
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sunLight.shadow.camera.top = d;
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sunLight.shadow.camera.bottom = -d;
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const plane = new THREE.Mesh(
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new THREE.PlaneGeometry(10000, 10000),
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new THREE.MeshLambertMaterial({ color: SETTINGS.colors.ground })
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);
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plane.rotation.x = -Math.PI / 2;
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plane.position.y = -0.5;
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plane.name = "GROUND";
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plane.receiveShadow = true;
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scene.add(plane);
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sunLight.shadow.camera.near = 0.5;
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sunLight.shadow.camera.far = 4500;
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sunLight.shadow.bias = SETTINGS.shadows.bias;
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scene.add(sunLight);
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}
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function setupControls() {
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controls = new MapControls(camera, renderer.domElement);
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controls.enableDamping = true;
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controls.dampingFactor = 0.05;
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controls.minDistance = 50;
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controls.maxDistance = 3000;
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controls.maxPolarAngle = Math.PI / 2 - 0.1; // Don't go below ground
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controls.enableDamping = true;
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controls.maxPolarAngle = Math.PI / 2 - 0.1;
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raycaster = new THREE.Raycaster();
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}
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function createGround() {
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const geom = new THREE.PlaneGeometry(10000, 10000);
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const mat = new THREE.MeshLambertMaterial({ color: SETTINGS.colors.ground });
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const mesh = new THREE.Mesh(geom, mat);
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mesh.rotation.x = -Math.PI / 2;
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mesh.position.y = -0.5; // Slightly below features
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mesh.receiveShadow = true;
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scene.add(mesh);
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}
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// ==========================================
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// 3. Data Processing & Mesh Generation
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// ==========================================
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function loadCityData() {
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fetch(SETTINGS.dataUrl)
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.then(res => res.json())
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.then(data => {
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console.log("City data loaded. Generating geometry...");
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generateCity(data);
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})
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.catch(err => console.error("Error loading city data:", err));
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}
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function generateCity(data) {
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// 1. Water (Flat Polygons)
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if (data.water && data.water.length) {
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createPolygonLayer(data.water, SETTINGS.colors.water, 0, 0.1);
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}
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// 2. Parks (Flat Polygons)
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if (data.parks && data.parks.length) {
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createPolygonLayer(data.parks, SETTINGS.colors.park, 0, 0.2);
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}
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// 3. Roads (Lines)
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if (data.roads && data.roads.length) {
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createRoadLayer(data.roads, SETTINGS.colors.road, 0.3);
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}
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// 4. Buildings (Extruded Polygons)
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if (data.buildings && data.buildings.length) {
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createBuildingLayer(data.buildings, SETTINGS.colors.building);
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}
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}
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/**
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* Creates flat meshes for things like water or parks.
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* Uses BufferGeometryUtils to merge them into one draw call.
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*/
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function createPolygonLayer(items, color, height, yOffset) {
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const geometries = [];
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items.forEach(item => {
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const shape = createShapeFromPoints(item.shape);
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const geometry = new THREE.ShapeGeometry(shape);
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// Rotate to lie flat on XZ plane
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geometry.rotateX(-Math.PI / 2);
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geometry.translate(0, yOffset, 0); // Lift slightly to avoid z-fighting
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geometries.push(geometry);
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function setupInteractions() {
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window.addEventListener('resize', () => {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize(window.innerWidth, window.innerHeight);
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});
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if (geometries.length === 0) return;
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window.addEventListener('pointerdown', (event) => {
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if (event.button !== 0) return;
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const mergedGeometry = BufferGeometryUtils.mergeGeometries(geometries);
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const material = new THREE.MeshLambertMaterial({ color: color, side: THREE.DoubleSide });
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const mesh = new THREE.Mesh(mergedGeometry, material);
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mesh.receiveShadow = true;
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scene.add(mesh);
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}
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mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
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mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
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/**
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* Creates extruded meshes for buildings.
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*/
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function createBuildingLayer(buildings, color) {
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const geometries = [];
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raycaster.setFromCamera(mouse, camera);
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const intersects = raycaster.intersectObjects(scene.children);
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const hit = intersects.find(obj => obj.object.name === "GROUND");
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buildings.forEach(b => {
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const shape = createShapeFromPoints(b.shape);
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// Extrude Settings
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const extrudeSettings = {
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depth: b.height,
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bevelEnabled: false,
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};
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const geometry = new THREE.ExtrudeGeometry(shape, extrudeSettings);
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geometry.rotateX(-Math.PI / 2);
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geometries.push(geometry);
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});
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if (geometries.length === 0) return;
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const mergedGeometry = BufferGeometryUtils.mergeGeometries(geometries);
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// Center the geometry to optimize bounding sphere calculations
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mergedGeometry.computeBoundingSphere();
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const material = new THREE.MeshStandardMaterial({
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color: color,
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roughness: 0.6,
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metalness: 0.1
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});
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const mesh = new THREE.Mesh(mergedGeometry, material);
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mesh.castShadow = true;
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mesh.receiveShadow = true;
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scene.add(mesh);
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}
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/**
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* Creates simple lines for roads.
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* Note: THREE.Line doesn't cast shadows easily, but it's performant.
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*/
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function createRoadLayer(roads, color, yOffset) {
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const positions = [];
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roads.forEach(road => {
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const path = road.path;
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for (let i = 0; i < path.length - 1; i++) {
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positions.push(path[i][0], path[i][1], 0);
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positions.push(path[i + 1][0], path[i + 1][1], 0);
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if (hit && routingData) {
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// Pass the Hit Point (X, Z) directly.
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// Z corresponds to our flipped Y in the graph.
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handleMapClick(hit.point.x, hit.point.z);
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}
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});
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}
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const geometry = new THREE.BufferGeometry();
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geometry.setAttribute('position', new THREE.Float32BufferAttribute(positions, 3));
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geometry.rotateX(-Math.PI / 2);
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geometry.translate(0, yOffset, 0);
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// ==========================================
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// 4. Visual Rendering
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// ==========================================
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function renderCity(data) {
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const createLayer = (items, color, height, lift, isExtruded) => {
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if (!items || !items.length) return;
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const geometries = [];
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items.forEach(item => {
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const polyData = item.shape;
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if (!polyData || !polyData.outer || polyData.outer.length < 3) return;
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const material = new THREE.LineBasicMaterial({
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color: color,
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opacity: 0.8,
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transparent: true
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const shape = new THREE.Shape();
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shape.moveTo(polyData.outer[0][0], polyData.outer[0][1]);
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for (let i = 1; i < polyData.outer.length; i++) shape.lineTo(polyData.outer[i][0], polyData.outer[i][1]);
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if (polyData.holes) {
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polyData.holes.forEach(holePts => {
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if (holePts.length < 3) return;
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const holePath = new THREE.Path();
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holePath.moveTo(holePts[0][0], holePts[0][1]);
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for (let j = 1; j < holePts.length; j++) holePath.lineTo(holePts[j][0], holePts[j][1]);
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shape.holes.push(holePath);
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});
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}
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if (isExtruded) {
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const geom = new THREE.ExtrudeGeometry(shape, { depth: item.height || height, bevelEnabled: false });
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geom.rotateX(-Math.PI / 2);
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geometries.push(geom);
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} else {
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const geom = new THREE.ShapeGeometry(shape);
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geom.rotateX(-Math.PI / 2);
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geom.translate(0, lift, 0);
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geometries.push(geom);
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}
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});
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if (!geometries.length) return;
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const merged = BufferGeometryUtils.mergeGeometries(geometries);
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const mat = new THREE.MeshStandardMaterial({ color: color, roughness: 0.8, side: THREE.DoubleSide });
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const mesh = new THREE.Mesh(merged, mat);
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mesh.receiveShadow = true;
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if (isExtruded) mesh.castShadow = true;
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scene.add(mesh);
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};
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createLayer(data.water, SETTINGS.colors.water, 0, 0.1, false);
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createLayer(data.parks, SETTINGS.colors.park, 0, 0.2, false);
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createLayer(data.roads, SETTINGS.colors.road, 0, 0.3, false);
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createLayer(data.buildings, SETTINGS.colors.building, 10, 0, true);
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}
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// ==========================================
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// 5. Routing Logic (A*)
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// ==========================================
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function handleMapClick(x, z) {
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const nearestId = findNearestNode(x, z);
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if (!startNode) {
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startNode = nearestId;
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placeMarker('start', routingData.nodes[nearestId], SETTINGS.colors.pathStart);
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if (markers.end) { scene.remove(markers.end); markers.end = null; }
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if (markers.pathMesh) { scene.remove(markers.pathMesh); markers.pathMesh = null; }
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endNode = null;
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} else {
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endNode = nearestId;
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placeMarker('end', routingData.nodes[nearestId], SETTINGS.colors.pathEnd);
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const path = computePathAStar(startNode, endNode);
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if (path) drawPath(path);
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startNode = null;
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}
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}
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function findNearestNode(x, z) {
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let closestId = null;
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let minDist = Infinity;
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for (const [id, node] of Object.entries(routingData.nodes)) {
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// node.y is already flipped to match Z
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const dx = node.x - x;
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const dz = node.y - z;
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const d2 = dx * dx + dz * dz;
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if (d2 < minDist) {
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minDist = d2;
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closestId = parseInt(id);
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}
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}
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return closestId;
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}
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function computePathAStar(start, end) {
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const openSet = new Set([start]);
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const cameFrom = {};
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const gScore = {};
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const fScore = {};
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gScore[start] = 0;
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fScore[start] = heuristic(start, end);
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while (openSet.size > 0) {
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let current = null;
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let minF = Infinity;
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for (const node of openSet) {
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const score = fScore[node] !== undefined ? fScore[node] : Infinity;
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if (score < minF) { minF = score; current = node; }
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}
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if (current === end) return reconstructPath(cameFrom, current);
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openSet.delete(current);
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const neighbors = routingData.adjacency[current] || [];
|
||||
for (const neighbor of neighbors) {
|
||||
const tentativeG = gScore[current] + neighbor.cost;
|
||||
if (tentativeG < (gScore[neighbor.to] !== undefined ? gScore[neighbor.to] : Infinity)) {
|
||||
cameFrom[neighbor.to] = { prev: current, edgeIdx: neighbor.edgeIndex, isReverse: neighbor.isReverse };
|
||||
gScore[neighbor.to] = tentativeG;
|
||||
fScore[neighbor.to] = tentativeG + heuristic(neighbor.to, end);
|
||||
openSet.add(neighbor.to);
|
||||
}
|
||||
}
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
function heuristic(a, b) {
|
||||
const nA = routingData.nodes[a];
|
||||
const nB = routingData.nodes[b];
|
||||
return Math.sqrt((nA.x - nB.x) ** 2 + (nA.y - nB.y) ** 2);
|
||||
}
|
||||
|
||||
function reconstructPath(cameFrom, current) {
|
||||
const edges = [];
|
||||
while (current in cameFrom) {
|
||||
const data = cameFrom[current];
|
||||
edges.push({ edgeData: routingData.edges[data.edgeIdx], isReverse: data.isReverse });
|
||||
current = data.prev;
|
||||
}
|
||||
return edges.reverse();
|
||||
}
|
||||
|
||||
// ==========================================
|
||||
// 6. Path Drawing
|
||||
// ==========================================
|
||||
function drawPath(pathEdges) {
|
||||
if (markers.pathMesh) scene.remove(markers.pathMesh);
|
||||
|
||||
const points = [];
|
||||
const ROAD_OFFSET = 3.0;
|
||||
|
||||
pathEdges.forEach(step => {
|
||||
const rawPoints = step.edgeData.points;
|
||||
// Map raw array to Vectors. Note: p[1] is already flipped to Z space
|
||||
let segmentPoints = rawPoints.map(p => new THREE.Vector2(p[0], p[1]));
|
||||
|
||||
if (step.isReverse) segmentPoints.reverse();
|
||||
|
||||
// Calculate offset for "Right Hand Drive"
|
||||
const offsetSegment = getOffsetPath(segmentPoints, ROAD_OFFSET);
|
||||
|
||||
offsetSegment.forEach(p => {
|
||||
// p.x is X, p.y is Z (since we flipped it)
|
||||
points.push(new THREE.Vector3(p.x, 0.5, p.y));
|
||||
});
|
||||
});
|
||||
|
||||
const lineSegments = new THREE.LineSegments(geometry, material);
|
||||
scene.add(lineSegments);
|
||||
const curve = new THREE.CatmullRomCurve3(points);
|
||||
const tubeGeom = new THREE.TubeGeometry(curve, points.length, 1.5, 6, false);
|
||||
const tubeMat = new THREE.MeshBasicMaterial({ color: SETTINGS.colors.route });
|
||||
markers.pathMesh = new THREE.Mesh(tubeGeom, tubeMat);
|
||||
scene.add(markers.pathMesh);
|
||||
}
|
||||
|
||||
/**
|
||||
* Helper to convert array of [x,z] points into a THREE.Shape
|
||||
*/
|
||||
function createShapeFromPoints(points) {
|
||||
const shape = new THREE.Shape();
|
||||
if (!points || points.length === 0) return shape;
|
||||
function getOffsetPath(points, offset) {
|
||||
if (points.length < 2) return points;
|
||||
const newPath = [];
|
||||
|
||||
// First point
|
||||
shape.moveTo(points[0][0], points[0][1]);
|
||||
for (let i = 0; i < points.length - 1; i++) {
|
||||
const p1 = points[i];
|
||||
const p2 = points[i + 1];
|
||||
|
||||
// Subsequent points
|
||||
for (let i = 1; i < points.length; i++) {
|
||||
shape.lineTo(points[i][0], points[i][1]);
|
||||
const dir = new THREE.Vector2().subVectors(p2, p1).normalize();
|
||||
// Normal for Right side: (-y, x)
|
||||
// Since our Coordinate system is flipped (Z is inverted), (-y, x) works as "Right"
|
||||
const normal = new THREE.Vector2(-dir.y, dir.x);
|
||||
|
||||
const off = normal.multiplyScalar(offset);
|
||||
newPath.push(new THREE.Vector2().addVectors(p1, off));
|
||||
if (i === points.length - 2) newPath.push(new THREE.Vector2().addVectors(p2, off));
|
||||
}
|
||||
|
||||
return shape;
|
||||
return newPath;
|
||||
}
|
||||
|
||||
// ==========================================
|
||||
// 4. Animation Loop
|
||||
// ==========================================
|
||||
|
||||
function onWindowResize() {
|
||||
camera.aspect = window.innerWidth / window.innerHeight;
|
||||
camera.updateProjectionMatrix();
|
||||
renderer.setSize(window.innerWidth, window.innerHeight);
|
||||
}
|
||||
|
||||
function updateSunPosition() {
|
||||
if (sunLight && camera) {
|
||||
// Keep shadow map centered around camera
|
||||
sunLight.position.x = camera.position.x + 100;
|
||||
sunLight.position.z = camera.position.z + 200;
|
||||
sunLight.target.position.set(camera.position.x, 0, camera.position.z);
|
||||
sunLight.target.updateMatrixWorld();
|
||||
}
|
||||
function placeMarker(type, node, color) {
|
||||
if (markers[type]) scene.remove(markers[type]);
|
||||
const geom = new THREE.SphereGeometry(4);
|
||||
const mat = new THREE.MeshBasicMaterial({ color: color });
|
||||
const mesh = new THREE.Mesh(geom, mat);
|
||||
// node.y is now Z
|
||||
mesh.position.set(node.x, 2, node.y);
|
||||
markers[type] = mesh;
|
||||
scene.add(mesh);
|
||||
}
|
||||
|
||||
function animate() {
|
||||
requestAnimationFrame(animate);
|
||||
controls.update();
|
||||
updateSunPosition();
|
||||
renderer.render(scene, camera);
|
||||
}
|
||||
|
||||
// Start
|
||||
init();
|
||||
|
||||
Reference in New Issue
Block a user