webgl_lines_fat

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 { OrbitControls } from "three/examples/jsm/controls/OrbitControls.js";
import { Line2 } from "three/examples/jsm/lines/Line2.js";
import { LineMaterial } from "three/examples/jsm/lines/LineMaterial.js";
import { LineGeometry } from "three/examples/jsm/lines/LineGeometry.js";
import * as GeometryUtils from "three/examples/jsm/utils/GeometryUtils.js";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_lines_fat",
  useLoaders: [],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "- fat lines"
      }
    ]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    let line, renderer, scene, camera, camera2, controls;
    let line1;
    let matLine, matLineBasic, matLineDashed;
    let stats;
    let gui;
    let insetWidth;
    let insetHeight;
    init();
    function init() {
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setClearColor(0, 0);
      renderer.setAnimationLoop(animate);
      scene = new THREE.Scene();
      camera = new THREE.PerspectiveCamera(40, window.innerWidth / window.innerHeight, 1, 1e3);
      camera.position.set(-40, 0, 60);
      camera2 = new THREE.PerspectiveCamera(40, 1, 1, 1e3);
      camera2.position.copy(camera.position);
      controls = new OrbitControls(camera, renderer.domElement);
      controls.enableDamping = true;
      controls.minDistance = 10;
      controls.maxDistance = 500;
      const positions = [];
      const colors = [];
      const points = GeometryUtils.hilbert3D(
        new THREE.Vector3(0, 0, 0),
        20,
        1,
        0,
        1,
        2,
        3,
        4,
        5,
        6,
        7
      );
      const spline = new THREE.CatmullRomCurve3(points);
      const divisions = Math.round(12 * points.length);
      const point = new THREE.Vector3();
      const color = new THREE.Color();
      for (let i = 0, l = divisions; i < l; i++) {
        const t = i / l;
        spline.getPoint(t, point);
        positions.push(point.x, point.y, point.z);
        color.setHSL(t, 1, 0.5, THREE.SRGBColorSpace);
        colors.push(color.r, color.g, color.b);
      }
      const geometry = new LineGeometry();
      geometry.setPositions(positions);
      geometry.setColors(colors);
      matLine = new LineMaterial({
        color: 16777215,
        linewidth: 5,
        // in world units with size attenuation, pixels otherwise
        vertexColors: true,
        dashed: false,
        alphaToCoverage: true
      });
      line = new Line2(geometry, matLine);
      line.computeLineDistances();
      line.scale.set(1, 1, 1);
      scene.add(line);
      const geo = new THREE.BufferGeometry();
      geo.setAttribute("position", new THREE.Float32BufferAttribute(positions, 3));
      geo.setAttribute("color", new THREE.Float32BufferAttribute(colors, 3));
      matLineBasic = new THREE.LineBasicMaterial({ vertexColors: true });
      matLineDashed = new THREE.LineDashedMaterial({
        vertexColors: true,
        scale: 2,
        dashSize: 1,
        gapSize: 1
      });
      line1 = new THREE.Line(geo, matLineBasic);
      line1.computeLineDistances();
      line1.visible = false;
      scene.add(line1);
      window.addEventListener("resize", onWindowResize);
      onWindowResize();
      stats = new Stats(renderer);
      initGui();
      needToDispose(renderer, scene, controls);
    }
    function onWindowResize() {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
      insetWidth = window.innerHeight / 4;
      insetHeight = window.innerHeight / 4;
      camera2.aspect = insetWidth / insetHeight;
      camera2.updateProjectionMatrix();
    }
    function animate() {
      renderer.setClearColor(0, 0);
      renderer.setViewport(0, 0, window.innerWidth, window.innerHeight);
      controls.update();
      renderer.render(scene, camera);
      renderer.setClearColor(2236962, 1);
      renderer.clearDepth();
      renderer.setScissorTest(true);
      renderer.setScissor(20, 20, insetWidth, insetHeight);
      renderer.setViewport(20, 20, insetWidth, insetHeight);
      camera2.position.copy(camera.position);
      camera2.quaternion.copy(camera.quaternion);
      renderer.render(scene, camera2);
      renderer.setScissorTest(false);
      stats.update();
    }
    function initGui() {
      gui = new GUI();
      const param = {
        "line type": 0,
        "world units": false,
        width: 5,
        alphaToCoverage: true,
        dashed: false,
        "dash scale": 1,
        "dash / gap": 1
      };
      gui.add(param, "line type", { LineGeometry: 0, "gl.LINE": 1 }).onChange(function(val) {
        switch (val) {
          case 0:
            line.visible = true;
            line1.visible = false;
            break;
          case 1:
            line.visible = false;
            line1.visible = true;
            break;
        }
      });
      gui.add(param, "world units").onChange(function(val) {
        matLine.worldUnits = val;
        matLine.needsUpdate = true;
      });
      gui.add(param, "width", 1, 10).onChange(function(val) {
        matLine.linewidth = val;
      });
      gui.add(param, "alphaToCoverage").onChange(function(val) {
        matLine.alphaToCoverage = val;
      });
      gui.add(param, "dashed").onChange(function(val) {
        matLine.dashed = val;
        line1.material = val ? matLineDashed : matLineBasic;
      });
      gui.add(param, "dash scale", 0.5, 2, 0.1).onChange(function(val) {
        matLine.dashScale = val;
        matLineDashed.scale = val;
      });
      gui.add(param, "dash / gap", { "2 : 1": 0, "1 : 1": 1, "1 : 2": 2 }).onChange(function(val) {
        switch (val) {
          case 0:
            matLine.dashSize = 2;
            matLine.gapSize = 1;
            matLineDashed.dashSize = 2;
            matLineDashed.gapSize = 1;
            break;
          case 1:
            matLine.dashSize = 1;
            matLine.gapSize = 1;
            matLineDashed.dashSize = 1;
            matLineDashed.gapSize = 1;
            break;
          case 2:
            matLine.dashSize = 1;
            matLine.gapSize = 2;
            matLineDashed.dashSize = 1;
            matLineDashed.gapSize = 2;
            break;
        }
      });
    }
  }
};
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;