webgl_modifier_curve

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.jstypings.d.ts

import * as THREE from "three";
import { TransformControls } from "three/examples/jsm/controls/TransformControls.js";
import { Flow } from "three/examples/jsm/modifiers/CurveModifier.js";
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_modifier_curve",
  useLoaders: [FontLoader],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "webgl - curve modifier"
      }
    ]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    const ACTION_SELECT = 1, ACTION_NONE = 0;
    const curveHandles = [];
    const mouse = new THREE.Vector2();
    let stats;
    let scene, camera, renderer, rayCaster, control, flow, action = ACTION_NONE;
    init();
    function init() {
      scene = new THREE.Scene();
      camera = new THREE.PerspectiveCamera(40, window.innerWidth / window.innerHeight, 1, 1e3);
      camera.position.set(2, 2, 4);
      camera.lookAt(scene.position);
      const initialPoints = [
        { x: 1, y: 0, z: -1 },
        { x: 1, y: 0, z: 1 },
        { x: -1, y: 0, z: 1 },
        { x: -1, y: 0, z: -1 }
      ];
      const boxGeometry = new THREE.BoxGeometry(0.1, 0.1, 0.1);
      const boxMaterial = new THREE.MeshBasicMaterial();
      for (const handlePos of initialPoints) {
        const handle = new THREE.Mesh(boxGeometry, boxMaterial);
        handle.position.copy(handlePos);
        curveHandles.push(handle);
        scene.add(handle);
      }
      const curve = new THREE.CatmullRomCurve3(curveHandles.map((handle) => handle.position));
      curve.curveType = "centripetal";
      curve.closed = true;
      const points = curve.getPoints(50);
      const line = new THREE.LineLoop(
        new THREE.BufferGeometry().setFromPoints(points),
        new THREE.LineBasicMaterial({ color: 65280 })
      );
      scene.add(line);
      const light = new THREE.DirectionalLight(16755251, 3);
      light.position.set(-10, 10, 10);
      scene.add(light);
      const light2 = new THREE.AmbientLight(14707, 3);
      scene.add(light2);
      const loader = new FontLoader();
      loader.load("fonts/helvetiker_regular.typeface.json", function(font) {
        const geometry = new TextGeometry("Hello three.js!", {
          font,
          size: 0.2,
          depth: 0.05,
          curveSegments: 12,
          bevelEnabled: true,
          bevelThickness: 0.02,
          bevelSize: 0.01,
          bevelOffset: 0,
          bevelSegments: 5
        });
        geometry.rotateX(Math.PI);
        const material = new THREE.MeshStandardMaterial({
          color: 10092543
        });
        const objectToCurve = new THREE.Mesh(geometry, material);
        flow = new Flow(objectToCurve);
        flow.updateCurve(0, curve);
        scene.add(flow.object3D);
      });
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setAnimationLoop(animate);
      renderer.domElement.addEventListener("pointerdown", onPointerDown);
      rayCaster = new THREE.Raycaster();
      control = new TransformControls(camera, renderer.domElement);
      control.addEventListener("dragging-changed", function(event) {
        if (!event.value) {
          const points2 = curve.getPoints(50);
          line.geometry.setFromPoints(points2);
          flow.updateCurve(0, curve);
        }
      });
      stats = new Stats(renderer);
      window.addEventListener("resize", onWindowResize);
      needToDispose(renderer, scene, control);
    }
    function onWindowResize() {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
    }
    function onPointerDown(event) {
      action = ACTION_SELECT;
      mouse.x = event.clientX / window.innerWidth * 2 - 1;
      mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
    }
    function animate() {
      if (action === ACTION_SELECT) {
        rayCaster.setFromCamera(mouse, camera);
        action = ACTION_NONE;
        const intersects = rayCaster.intersectObjects(curveHandles, false);
        if (intersects.length) {
          const target = intersects[0].object;
          control.attach(target);
          if (control.isObject3D) {
            scene.add(control);
          } else {
            const gizmo = control.getHelper();
            scene.add(gizmo);
          }
        }
      }
      if (flow) {
        flow.moveAlongCurve(1e-3);
      }
      render();
    }
    function render() {
      renderer.render(scene, camera);
      stats.update();
    }
  }
};
export {
  exampleInfo as default
};

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;

webgl_modifier_curve ​

webgl_modifier_curve