mirror of
https://github.com/jiawanlong/Cesium-Examples.git
synced 2025-07-05 07:37:31 +00:00
137 lines
5.1 KiB
HTML
137 lines
5.1 KiB
HTML
<!--********************************************************************
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* by 优雅永不过时 https://github.com/z2586300277
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*********************************************************************-->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8" />
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<style>
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* {
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margin: 0;
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padding: 0;
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overflow: hidden;
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}
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body,
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#box {
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width: 100%;
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background-color: #1f1f1f;
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height: 100%;
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}
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</style>
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</head>
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<body>
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<div id="box"></div>
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<script type="importmap">
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{
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"imports": {
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"three": "./../../three/build/three.module.js",
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"three/addons/": "./../../three/examples/jsm/",
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"three/example/": "./../../three/examples/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from "three";
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import { OrbitControls } from "three/addons/controls/OrbitControls.js";
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const box = document.getElementById('box')
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const scene = new THREE.Scene()
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const camera = new THREE.PerspectiveCamera(75, box.clientWidth / box.clientHeight, 0.1, 1000)
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camera.position.set(0, 10, 10)
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const renderer = new THREE.WebGLRenderer()
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renderer.setSize(box.clientWidth, box.clientHeight)
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box.appendChild(renderer.domElement)
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new OrbitControls(camera, renderer.domElement)
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scene.add(new THREE.AmbientLight(0xffffff, 3), new THREE.AxesHelper(1000))
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animate()
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function animate() {
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requestAnimationFrame(animate)
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renderer.render(scene, camera)
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}
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window.onresize = () => {
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renderer.setSize(box.clientWidth, box.clientHeight)
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camera.aspect = box.clientWidth / box.clientHeight
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camera.updateProjectionMatrix()
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}
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const citys = await fetch('./city.json').then(res => res.json()) // 获取城市数据
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const updateCanvasText = createCanvasText({ dpr: 1.4 }) // 创建canvas
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const getColor = () => '#' + Math.floor(Math.random() * 0xffffff).toString(16).padStart(6, '0') // 随机颜色
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for (const key in citys) {
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const canvas = updateCanvasText({ text: key, color: getColor() })
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const texture = new THREE.TextureLoader().load(canvas.toDataURL())
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const material = new THREE.SpriteMaterial({ map: texture })
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const sprite = new THREE.Sprite(material)
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sprite.scale.set(canvas.width / canvas.height, 1, 1)
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// 设置随机位置
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sprite.position.set(
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Math.random() * 20 - 10,
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Math.random() * 20 - 10,
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Math.random() * 20 - 10
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)
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scene.add(sprite)
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}
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// 创建canvas文字方法
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function createCanvasText(params) {
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const defaultParams = { dpr: 1, maxWidth: 100, fontSize: 20, color: 'white', fontFamily: 'serif', align: 'center', border: false, ...params } // 默认参数
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const { dpr, border, maxWidth, fontSize, align } = defaultParams
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const devicePixelRatio = window.devicePixelRatio * dpr
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// 准备 cnvas
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const canvas = document.createElement('canvas')
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canvas.width = maxWidth * devicePixelRatio
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canvas.height = fontSize * devicePixelRatio
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// 获取 2d 上下文
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const ctx = canvas.getContext('2d')
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ctx.imageSmoothingQuality = 'high'
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ctx.scale(devicePixelRatio, devicePixelRatio)
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// 创建文字
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const createText = ({ text, color, fontSize, fontFamily }) => {
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// 参数设定
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ctx.fillStyle = color || defaultParams.color
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ctx.font = fontSize || defaultParams.fontSize + 'px ' + fontFamily || defaultParams.fontFamily
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// 文本长度计算
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let textMaxNum = 0
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let totalWidth = 0
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for (let i = 0; i < text.length; i++) {
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const metrics = ctx.measureText(text[i])
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totalWidth += metrics.width;
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if (totalWidth > maxWidth) break
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textMaxNum++
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}
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text = text.slice(0, textMaxNum)
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// 文字 绘制
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const metrics = ctx.measureText(text) // 文本尺寸
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const actualHeight = metrics.actualBoundingBoxAscent + metrics.actualBoundingBoxDescent // 实际文字高度
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const textFillHeight = (canvas.height / devicePixelRatio - actualHeight) / 2 + metrics.actualBoundingBoxAscent
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let textLeftOffset = 0
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if (align === 'center') textLeftOffset = (canvas.width / devicePixelRatio - metrics.width) / 2
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ctx.fillText(text, textLeftOffset, textFillHeight, canvas.width / devicePixelRatio)
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}
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return (parameters) => {
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ctx.clearRect(0, 0, canvas.width, canvas.height) // 清空 canvas 文字
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createText(parameters) // 创建文字
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return canvas
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}
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}
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</script>
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</body>
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</html> |