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webgl.ts
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webgl.ts
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// =============================================================================
// Fractal Component
// (c) Mathigon
// =============================================================================
/// <reference types="three"/>
import {Obj} from '@mathigon/core';
import {loadScript, $N, CanvasView, ElementView} from '@mathigon/boost';
const url = '/resources/shared/vendor/three-91.min.js';
const renderers: Obj<THREE.WebGLRenderer> = {};
let threePromise: Promise<any>;
function loadTHREE() {
if (!threePromise) threePromise = loadScript(url);
return threePromise;
}
function getRenderer(width: number, height: number) {
const id = [width, height].join(',');
if (renderers[id]) return renderers[id];
const renderer = new THREE.WebGLRenderer({antialias: true});
renderer.localClippingEnabled = true;
renderer.setClearColor(0xffffff, 1);
renderer.setSize(width, height);
return renderers[id] = renderer;
}
export interface Graphics3D {
$canvas: CanvasView;
camera: THREE.PerspectiveCamera;
renderer: THREE.WebGLRenderer;
draw: () => void;
onDraw: (fn: () => void) => void;
add: (obj: THREE.Object3D) => void;
}
export async function create3D($el: ElementView, fov: number, width: number,
height = width): Promise<Graphics3D> {
const $canvas = $N('canvas',
{width, height, style: 'max-width: 100%'}, $el) as CanvasView;
const context = $canvas.ctx;
await loadTHREE();
const scene = new THREE.Scene();
const renderer = getRenderer(width, height);
const camera = new THREE.PerspectiveCamera(fov, width / height, 0.1, 1000);
scene.add(camera);
const callbacks: (() => void)[] = [];
const onDraw = (fn: () => void) => callbacks.push(fn);
const add = (obj: THREE.Object3D) => scene.add(obj);
const draw = () => {
renderer.render(scene, camera);
context.clearRect(0, 0, width, height);
context.drawImage(renderer.domElement, 0, 0);
for (let fn of callbacks) fn();
};
return {$canvas, camera, renderer, draw, onDraw, add};
}