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/**
* Main React app logic
*/
import React, { useState, useEffect, useCallback } from "react";
import * as THREE from "three";
import { MTLLoader, OBJLoader } from "@hbis/three-obj-mtl-loader";
import Detail from "./Detail.js";
import Legend from "./Legend.js";
import buildGraph from "../graph.js";
export default function App() {
const [db, setDb] = useState(null);
const [node, setNode] = useState(null);
const [graph, setGraph] = useState(null);
const [selectedCategory, setSelectedCategory] = useState(null);
const [detailVisible, setDetailVisible] = useState(null);
/** Load the database */
useEffect(async () => {
const newDb = await loadDB();
await loadObjects(newDb);
setDb(newDb);
setGraph(
buildGraph({
db: newDb,
handlers: {
click: handleClick,
},
})
);
}, []);
/** Click to open a node */
const handleClick = useCallback((node) => {
setNode(node);
setDetailVisible(true);
});
/** Click to close the media modal */
const handleClose = useCallback((node) => {
setDetailVisible(false);
});
/** Select or clear the category */
const handleSelect = useCallback((category) => {
if (category === selectedCategory) {
setSelectedCategory(null);
graph.onSelect(null);
} else {
setSelectedCategory(category);
graph.onSelect(category);
}
});
return (
<div>
<Detail node={node} visible={detailVisible} onClose={handleClose} />
<Legend
visible={!detailVisible}
selected={selectedCategory}
onSelect={handleSelect}
/>
</div>
);
}
async function loadDB() {
const request = await fetch("/assets/db.json");
return await request.json();
}
async function loadObjects(db) {
await Promise.all(
db.page.reduce((promises, item) => {
if (item.threeObject) {
promises.push(loadObject(item));
}
return promises;
}, [])
);
}
function loadObject(item) {
return new Promise((resolve) => {
let { path, file } = item.threeObject;
path = "assets/" + path;
const manager = new THREE.LoadingManager();
manager.setURLModifier((url) => {
if (!url.match("/")) {
url = path + url;
}
return url;
});
const mtlLoader = new MTLLoader(manager);
const objLoader = new OBJLoader(manager);
mtlLoader.setMaterialOptions({ side: THREE.DoubleSide });
mtlLoader.load(file.replace(".obj", ".mtl"), (materials) => {
materials.preload();
objLoader.setMaterials(materials);
objLoader.load(file, (object) => {
item.object = object;
resolve();
});
});
});
}
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