webgl_sprites
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。
js
import * as THREE from "three";
/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
name: "webgl_sprites",
useLoaders: [],
info: [
[
{
tag: "a",
link: "https://threejs.org",
content: "three.js"
},
{
tag: "text",
content: "- sprites"
}
]
],
init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
let camera, scene, renderer;
let cameraOrtho, sceneOrtho;
let spriteTL, spriteTR, spriteBL, spriteBR, spriteC;
let mapC;
let group;
init();
function init() {
const width = window.innerWidth;
const height = window.innerHeight;
camera = new THREE.PerspectiveCamera(60, width / height, 1, 2100);
camera.position.z = 1500;
cameraOrtho = new THREE.OrthographicCamera(
-width / 2,
width / 2,
height / 2,
-height / 2,
1,
10
);
cameraOrtho.position.z = 10;
scene = new THREE.Scene();
scene.fog = new THREE.Fog(0, 1500, 2100);
sceneOrtho = new THREE.Scene();
const amount = 200;
const radius = 500;
const textureLoader = new THREE.TextureLoader();
textureLoader.load("textures/sprite0.png", createHUDSprites);
const mapB = textureLoader.load("textures/sprite1.png");
mapC = textureLoader.load("textures/sprite2.png");
mapB.colorSpace = THREE.SRGBColorSpace;
mapC.colorSpace = THREE.SRGBColorSpace;
group = new THREE.Group();
const materialC = new THREE.SpriteMaterial({ map: mapC, color: 16777215, fog: true });
const materialB = new THREE.SpriteMaterial({ map: mapB, color: 16777215, fog: true });
for (let a = 0; a < amount; a++) {
const x = Math.random() - 0.5;
const y = Math.random() - 0.5;
const z = Math.random() - 0.5;
let material;
if (z < 0) {
material = materialB.clone();
} else {
material = materialC.clone();
material.color.setHSL(0.5 * Math.random(), 0.75, 0.5);
material.map.offset.set(-0.5, -0.5);
material.map.repeat.set(2, 2);
}
const sprite = new THREE.Sprite(material);
sprite.position.set(x, y, z);
sprite.position.normalize();
sprite.position.multiplyScalar(radius);
group.add(sprite);
}
scene.add(group);
renderer = new THREE.WebGLRenderer({ canvas });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setAnimationLoop(animate);
renderer.autoClear = false;
window.addEventListener("resize", onWindowResize);
needToDispose(renderer, scene);
}
function createHUDSprites(texture) {
texture.colorSpace = THREE.SRGBColorSpace;
const material = new THREE.SpriteMaterial({ map: texture });
const width = material.map.image.width;
const height = material.map.image.height;
spriteTL = new THREE.Sprite(material);
spriteTL.center.set(0, 1);
spriteTL.scale.set(width, height, 1);
sceneOrtho.add(spriteTL);
spriteTR = new THREE.Sprite(material);
spriteTR.center.set(1, 1);
spriteTR.scale.set(width, height, 1);
sceneOrtho.add(spriteTR);
spriteBL = new THREE.Sprite(material);
spriteBL.center.set(0, 0);
spriteBL.scale.set(width, height, 1);
sceneOrtho.add(spriteBL);
spriteBR = new THREE.Sprite(material);
spriteBR.center.set(1, 0);
spriteBR.scale.set(width, height, 1);
sceneOrtho.add(spriteBR);
spriteC = new THREE.Sprite(material);
spriteC.center.set(0.5, 0.5);
spriteC.scale.set(width, height, 1);
sceneOrtho.add(spriteC);
updateHUDSprites();
}
function updateHUDSprites() {
const width = window.innerWidth / 2;
const height = window.innerHeight / 2;
spriteTL.position.set(-width, height, 1);
spriteTR.position.set(width, height, 1);
spriteBL.position.set(-width, -height, 1);
spriteBR.position.set(width, -height, 1);
spriteC.position.set(0, 0, 1);
}
function onWindowResize() {
const width = window.innerWidth;
const height = window.innerHeight;
camera.aspect = width / height;
camera.updateProjectionMatrix();
cameraOrtho.left = -width / 2;
cameraOrtho.right = width / 2;
cameraOrtho.top = height / 2;
cameraOrtho.bottom = -height / 2;
cameraOrtho.updateProjectionMatrix();
updateHUDSprites();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function animate() {
const time = Date.now() / 1e3;
for (let i = 0, l = group.children.length; i < l; i++) {
const sprite = group.children[i];
const material = sprite.material;
const scale = Math.sin(time + sprite.position.x * 0.01) * 0.3 + 1;
let imageWidth = 1;
let imageHeight = 1;
if (material.map && material.map.image && material.map.image.width) {
imageWidth = material.map.image.width;
imageHeight = material.map.image.height;
}
sprite.material.rotation += 0.1 * (i / l);
sprite.scale.set(scale * imageWidth, scale * imageHeight, 1);
if (material.map !== mapC) {
material.opacity = Math.sin(time + sprite.position.x * 0.01) * 0.4 + 0.6;
}
}
group.rotation.x = time * 0.5;
group.rotation.y = time * 0.75;
group.rotation.z = time * 1;
renderer.clear();
renderer.render(scene, camera);
renderer.clearDepth();
renderer.render(sceneOrtho, cameraOrtho);
}
}
};
export {
exampleInfo as default
};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;