webgl_geometry_text

对应 three.js 示例地址 。

仅需关注 init 函数的内容，其他部分都是示例小程序所使用的描述配置。

example.js

import * as THREE from "three";
import { FontLoader } from "three/examples/jsm/loaders/FontLoader.js";
import { TextGeometry } from "three/examples/jsm/geometries/TextGeometry.js";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_geometry_text",
  useLoaders: [FontLoader],
  info: [
    [
      { tag: "a", link: "https://threejs.org", content: "three.js" },
      { tag: "text", content: "- procedural 3D text" }
    ],
    [{ tag: "text", content: "type to enter new text, drag to spin the text" }]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    THREE.Cache.enabled = true;
    needToDispose({
      dispose() {
        THREE.Cache.enabled = false;
      }
    });
    let camera, cameraTarget, scene, renderer;
    let group, textMesh1, textMesh2, textGeo, materials;
    let text = "three.js", bevelEnabled = true, font = void 0, fontName = "optimer", fontWeight = "bold";
    const depth = 20, size = 70, hover = 30, curveSegments = 4, bevelThickness = 2, bevelSize = 1.5;
    const fontMap = {
      helvetiker: 0,
      optimer: 1,
      gentilis: 2,
      "droid/droid_sans": 3,
      "droid/droid_serif": 4
    };
    const reverseFontMap = [];
    for (const i in fontMap) reverseFontMap[fontMap[i]] = i;
    let targetRotation = 0;
    let targetRotationOnPointerDown = 0;
    let pointerX = 0;
    let pointerXOnPointerDown = 0;
    let windowHalfX = window.innerWidth / 2;
    let fontIndex = 1;
    init();
    function init() {
      camera = new THREE.PerspectiveCamera(30, window.innerWidth / window.innerHeight, 1, 1500);
      camera.position.set(0, 400, 700);
      cameraTarget = new THREE.Vector3(0, 150, 0);
      scene = new THREE.Scene();
      scene.background = new THREE.Color(0);
      scene.fog = new THREE.Fog(0, 250, 1400);
      const dirLight = new THREE.DirectionalLight(16777215, 0.4);
      dirLight.position.set(0, 0, 1).normalize();
      scene.add(dirLight);
      const pointLight = new THREE.PointLight(16777215, 4.5, 0, 0);
      pointLight.color.setHSL(Math.random(), 1, 0.5);
      pointLight.position.set(0, 100, 90);
      scene.add(pointLight);
      materials = [
        new THREE.MeshPhongMaterial({ color: 16777215, flatShading: true }),
        // front
        new THREE.MeshPhongMaterial({ color: 16777215 })
        // side
      ];
      group = new THREE.Group();
      group.position.y = 100;
      scene.add(group);
      loadFont();
      const plane = new THREE.Mesh(
        new THREE.PlaneGeometry(1e4, 1e4),
        new THREE.MeshBasicMaterial({ color: 16777215, opacity: 0.5, transparent: true })
      );
      plane.position.y = 100;
      plane.rotation.x = -Math.PI / 2;
      scene.add(plane);
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setAnimationLoop(animate);
      canvas.addEventListener("pointerdown", onPointerDown);
      const params = {
        text,
        changeColor: function() {
          pointLight.color.setHSL(Math.random(), 1, 0.5);
        },
        changeFont: function() {
          fontIndex++;
          fontName = reverseFontMap[fontIndex % reverseFontMap.length];
          loadFont();
        },
        changeWeight: function() {
          if (fontWeight === "bold") {
            fontWeight = "regular";
          } else {
            fontWeight = "bold";
          }
          loadFont();
        },
        changeBevel: function() {
          bevelEnabled = !bevelEnabled;
          refreshText();
        }
      };
      const gui = new GUI();
      gui.add(params, "text").onChange((value) => {
        text = value;
        refreshText();
      });
      gui.add(params, "changeColor").name("change color");
      gui.add(params, "changeFont").name("change font");
      gui.add(params, "changeWeight").name("change weight");
      gui.add(params, "changeBevel").name("change bevel");
      gui.open();
      window.addEventListener("resize", onWindowResize);
      needToDispose(renderer, scene);
    }
    function onWindowResize() {
      windowHalfX = window.innerWidth / 2;
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
    }
    function loadFont() {
      const loader = new FontLoader();
      loader.load("fonts/" + fontName + "_" + fontWeight + ".typeface.json", function(response) {
        font = response;
        refreshText();
      });
    }
    function createText() {
      textGeo = new TextGeometry(text, {
        font,
        size,
        depth,
        curveSegments,
        bevelThickness,
        bevelSize,
        bevelEnabled
      });
      textGeo.computeBoundingBox();
      const centerOffset = -0.5 * (textGeo.boundingBox.max.x - textGeo.boundingBox.min.x);
      textMesh1 = new THREE.Mesh(textGeo, materials);
      textMesh1.position.x = centerOffset;
      textMesh1.position.y = hover;
      textMesh1.position.z = 0;
      textMesh1.rotation.x = 0;
      textMesh1.rotation.y = Math.PI * 2;
      group.add(textMesh1);
      {
        textMesh2 = new THREE.Mesh(textGeo, materials);
        textMesh2.position.x = centerOffset;
        textMesh2.position.y = -30;
        textMesh2.position.z = depth;
        textMesh2.rotation.x = Math.PI;
        textMesh2.rotation.y = Math.PI * 2;
        group.add(textMesh2);
      }
    }
    function refreshText() {
      group.remove(textMesh1);
      group.remove(textMesh2);
      if (!text) return;
      createText();
    }
    function onPointerDown(event) {
      if (event.isPrimary === false) return;
      pointerXOnPointerDown = event.clientX - windowHalfX;
      targetRotationOnPointerDown = targetRotation;
      canvas.addEventListener("pointermove", onPointerMove);
      canvas.addEventListener("pointerup", onPointerUp);
    }
    function onPointerMove(event) {
      if (event.isPrimary === false) return;
      pointerX = event.clientX - windowHalfX;
      targetRotation = targetRotationOnPointerDown + (pointerX - pointerXOnPointerDown) * 0.02;
    }
    function onPointerUp(event) {
      if (event.isPrimary === false) return;
      canvas.removeEventListener("pointermove", onPointerMove);
      canvas.removeEventListener("pointerup", onPointerUp);
    }
    function animate() {
      group.rotation.y += (targetRotation - group.rotation.y) * 0.05;
      camera.lookAt(cameraTarget);
      renderer.clear();
      renderer.render(scene, camera);
    }
  }
};
export {
  exampleInfo as default
};

typings.d.ts

import { Loader, TypedArray } from 'three';
/**
 * 官网示例的多端使用封装把版本
 * */
export interface OfficialExampleInfo extends MiniProgramMeta {
  /*** 示例名称（保持和官网一致）*/
  name: string;
  /** main */
  init: (context: LoadContext) => void;
}

export interface LoadContext {
  //为了减少官方代码的改动，实际上等同于 canvas
  window: EventTarget & { innerWidth: number; innerHeight: number; devicePixelRatio: number };
  /** HTMLCanvasElement */
  canvas: any;
  /** https://www.npmjs.com/package/lil-gui */
  GUI: any;
  /**
   * https://www.npmjs.com/package/stats.js
   * 也可以使用其他受支持的版本
   * */
  Stats: any;
  /** 收集需要 dispose 的对象（官方示例没有处理这部分）*/
  needToDispose: (...objs: any[]) => void | ((fromFn: () => any[]) => void);

  /**基于 raq 的通用封装 */
  useFrame(animateFunc: (/** ms */ delta: number) => void): { cancel: () => void };

  /** 显示加载模态框 */
  requestLoading(text?: string): Promise<void>;

  /** 隐藏加载模态框*/
  cancelLoading(): void;

  /** 保存文件的通用封装*/
  saveFile(
    fileName: string,
    data: ArrayBuffer | TypedArray | DataView | string
  ): Promise<string | null>;

  /** 示例使用 DracoDecoder 时的资源路径 */
  DecoderPath: {
    GLTF: string;
    STANDARD: string;
  };

  /** 为资源路径拼上 CDN 前缀 */
  withCDNPrefix(path: string): string;

  /**
   * 在小程序中应使用 import { VideoTexture } from '@minisheep/three-platform-adapter/override/jsm/textures/VideoTexture.js';
   * 正常情况（web） 可直接使用 THREE.VideoTexture
   * */
  getVideoTexture(videoOptions: VideoOptions): Promise<[{ isVideoTexture: true }, video: any]>;

  /**
   * 在小程序中应使用 import { CameraTexture } from '@minisheep/three-platform-adapter/override/jsm/textures/CameraTexture.js';
   * 正常情况（web） 可参考示例 webgl_materials_video_webcam
   * */
  getCameraTexture(): { isVideoTexture: true };

  /** 用于动态修改 info 中的占位符*/
  bindInfoText(template: `$${string}$`, initValue?: string): { value: string };

  /** 分屏控件对应的事件回调 */
  onSlideStart(handle: () => void): void;
  /** 分屏控件对应的事件回调 */
  onSlideEnd(handle: () => void): void;
  /** 分屏控件对应的事件回调 */
  onSlideChange(handle: (offset: number, boxSize: number) => void): void;
}

export type VideoOptions = {
  src: string;
  /** 相当于 HTMLVideoElement 的 naturalWidth (小程序中获取不到)*/
  width: number;
  /** 相当于 HTMLVideoElement 的 naturalHeight (小程序中获取不到)*/
  height: number;
  loop?: boolean;
  autoplay?: boolean;
  muted?: boolean;
};

/** 示例小程序中使用的一些配置 */
export interface MiniProgramMeta {
  /** 用于统计加载相关信息 */
  useLoaders: Loader[];
  /** 通用 info */
  info: TagItem[][];
  /** 特殊 info */
  infoPanel?: {
    left?: [string, string][];
    right?: [string, string][];
  };
  /** 分屏控件配置 */
  needSlider?: {
    /** 方向 */
    direction?: 'horizontal' | 'vertical';
    /** 初始偏移 0-100 */
    initPosition?: number;
  };
  /** 操作摇杆控件 */
  needArrowControls?: boolean;
  /** 默认需要的画布类型 */
  canvasType?: '2d' | 'webgl' | 'webgl2';
  /** 为保持效果一致所需要的画布样式 */
  canvasStyle?: {
    bgColor?: string;
    width?: number | string;
    height?: number | string;
  };
  /** 部分示例需要在加载前进行一些提示 */
  initAfterConfirm?: {
    /**
     * 提示类型
     * @default 'default'
     * */
    type?: 'warning' | 'default';
    text: string[];
  };
}

export interface BaseTag<T extends string> {
  tag: T;
  content: string;
}

export interface ATag extends BaseTag<'a'> {
  link: string;
}

export type TextTag = BaseTag<'text'>;

export type TagItem = TextTag | ATag;