webgl_lines_colors

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 * as GeometryUtils from "three/examples/jsm/utils/GeometryUtils.js";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_lines_colors",
  useLoaders: [],
  info: [
    [
      { tag: "a", link: "https://threejs.org", content: "three.js" },
      { tag: "text", content: "- color lines" }
    ],
    [
      { tag: "a", link: "http://en.wikipedia.org/wiki/Hilbert_curve", content: "Hilbert curve" },
      { tag: "text", content: "thanks to" },
      { tag: "a", link: "https://openprocessing.org/user/5654", content: "Thomas Diewald" }
    ]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    let mouseX = 0, mouseY = 0;
    let windowHalfX = window.innerWidth / 2;
    let windowHalfY = window.innerHeight / 2;
    let camera, scene, renderer;
    init();
    function init() {
      camera = new THREE.PerspectiveCamera(33, window.innerWidth / window.innerHeight, 1, 1e4);
      camera.position.z = 1e3;
      scene = new THREE.Scene();
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setAnimationLoop(animate);
      const hilbertPoints = GeometryUtils.hilbert3D(
        new THREE.Vector3(0, 0, 0),
        200,
        1,
        0,
        1,
        2,
        3,
        4,
        5,
        6,
        7
      );
      const geometry1 = new THREE.BufferGeometry();
      const geometry2 = new THREE.BufferGeometry();
      const geometry3 = new THREE.BufferGeometry();
      const subdivisions = 6;
      let vertices = [];
      let colors1 = [];
      let colors2 = [];
      let colors3 = [];
      const point = new THREE.Vector3();
      const color = new THREE.Color();
      const spline = new THREE.CatmullRomCurve3(hilbertPoints);
      for (let i = 0; i < hilbertPoints.length * subdivisions; i++) {
        const t = i / (hilbertPoints.length * subdivisions);
        spline.getPoint(t, point);
        vertices.push(point.x, point.y, point.z);
        color.setHSL(0.6, 1, Math.max(0, -point.x / 200) + 0.5, THREE.SRGBColorSpace);
        colors1.push(color.r, color.g, color.b);
        color.setHSL(0.9, 1, Math.max(0, -point.y / 200) + 0.5, THREE.SRGBColorSpace);
        colors2.push(color.r, color.g, color.b);
        color.setHSL(i / (hilbertPoints.length * subdivisions), 1, 0.5, THREE.SRGBColorSpace);
        colors3.push(color.r, color.g, color.b);
      }
      geometry1.setAttribute("position", new THREE.Float32BufferAttribute(vertices, 3));
      geometry2.setAttribute("position", new THREE.Float32BufferAttribute(vertices, 3));
      geometry3.setAttribute("position", new THREE.Float32BufferAttribute(vertices, 3));
      geometry1.setAttribute("color", new THREE.Float32BufferAttribute(colors1, 3));
      geometry2.setAttribute("color", new THREE.Float32BufferAttribute(colors2, 3));
      geometry3.setAttribute("color", new THREE.Float32BufferAttribute(colors3, 3));
      const geometry4 = new THREE.BufferGeometry();
      const geometry5 = new THREE.BufferGeometry();
      const geometry6 = new THREE.BufferGeometry();
      vertices = [];
      colors1 = [];
      colors2 = [];
      colors3 = [];
      for (let i = 0; i < hilbertPoints.length; i++) {
        const point2 = hilbertPoints[i];
        vertices.push(point2.x, point2.y, point2.z);
        color.setHSL(
          0.6,
          1,
          Math.max(0, (200 - hilbertPoints[i].x) / 400) * 0.5 + 0.5,
          THREE.SRGBColorSpace
        );
        colors1.push(color.r, color.g, color.b);
        color.setHSL(
          0.3,
          1,
          Math.max(0, (200 + hilbertPoints[i].x) / 400) * 0.5,
          THREE.SRGBColorSpace
        );
        colors2.push(color.r, color.g, color.b);
        color.setHSL(i / hilbertPoints.length, 1, 0.5, THREE.SRGBColorSpace);
        colors3.push(color.r, color.g, color.b);
      }
      geometry4.setAttribute("position", new THREE.Float32BufferAttribute(vertices, 3));
      geometry5.setAttribute("position", new THREE.Float32BufferAttribute(vertices, 3));
      geometry6.setAttribute("position", new THREE.Float32BufferAttribute(vertices, 3));
      geometry4.setAttribute("color", new THREE.Float32BufferAttribute(colors1, 3));
      geometry5.setAttribute("color", new THREE.Float32BufferAttribute(colors2, 3));
      geometry6.setAttribute("color", new THREE.Float32BufferAttribute(colors3, 3));
      const material = new THREE.LineBasicMaterial({ color: 16777215, vertexColors: true });
      let line, p;
      const scale = 0.3, d = 225;
      const parameters = [
        [material, scale * 1.5, [-225, -225 / 2, 0], geometry1],
        [material, scale * 1.5, [0, -225 / 2, 0], geometry2],
        [material, scale * 1.5, [d, -225 / 2, 0], geometry3],
        [material, scale * 1.5, [-225, d / 2, 0], geometry4],
        [material, scale * 1.5, [0, d / 2, 0], geometry5],
        [material, scale * 1.5, [d, d / 2, 0], geometry6]
      ];
      for (let i = 0; i < parameters.length; i++) {
        p = parameters[i];
        line = new THREE.Line(p[3], p[0]);
        line.scale.x = line.scale.y = line.scale.z = p[1];
        line.position.x = p[2][0];
        line.position.y = p[2][1];
        line.position.z = p[2][2];
        scene.add(line);
      }
      canvas.addEventListener("pointermove", onPointerMove);
      window.addEventListener("resize", onWindowResize);
      needToDispose(renderer, scene);
    }
    function onWindowResize() {
      windowHalfX = window.innerWidth / 2;
      windowHalfY = window.innerHeight / 2;
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
    }
    function onPointerMove(event) {
      if (event.isPrimary === false) return;
      mouseX = event.clientX - windowHalfX;
      mouseY = event.clientY - windowHalfY;
    }
    function animate() {
      camera.position.x += (mouseX - camera.position.x) * 0.05;
      camera.position.y += (-mouseY + 200 - camera.position.y) * 0.05;
      camera.lookAt(scene.position);
      const time = Date.now() * 5e-4;
      for (let i = 0; i < scene.children.length; i++) {
        const object = scene.children[i];
        if (object.isLine) {
          object.rotation.y = time * (i % 2 ? 1 : -1);
        }
      }
      renderer.render(scene, camera);
    }
  }
};
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_lines_colors ​

webgl_lines_colors