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// svg image server
const express = require("express");
const cors = require("cors");
const DOMParser = require("xmldom").DOMParser;
const XMLSerializer = require("xmldom").XMLSerializer;
const fs = require("fs");
const app = express();
app.use(cors());
app.use(express.static("public"));
app.listen(2707, () => {
console.log("Server listening on port 2707 👂");
});
const sidePiecesCount = 20; // size has to odd to make the puzzle solvable
app.get("/mapWidth", (req, res) => {
res.json(sidePiecesCount);
});
const parser = new DOMParser();
const svgText = fs.readFileSync(__dirname + "/resources/logo.svg", "utf8");
const svg = parser.parseFromString(svgText, "image/svg+xml");
const width = svg.documentElement.getAttribute("width");
const height = svg.documentElement.getAttribute("height");
const gridSideSize = Math.max(width, height);
const pieceSize = gridSideSize / sidePiecesCount;
const piecesMap = new Array(sidePiecesCount * sidePiecesCount);
for (let x = 0; x < sidePiecesCount; x++) {
for (let y = 0; y < sidePiecesCount; y++) {
const piece = svg.cloneNode(true);
piece.documentElement.setAttribute(
"viewBox",
`${x * pieceSize} ${y * pieceSize} ${pieceSize} ${pieceSize}`,
); // ATTENTION : this method is really slow, in real life cases you should really cut the image and not send it with information on where to crop it
piece.documentElement.setAttribute("width", `${pieceSize}`);
piece.documentElement.setAttribute("height", `${pieceSize}`);
const svgString = new XMLSerializer().serializeToString(piece);
piecesMap[x + y * sidePiecesCount] = {
svg: svgString,
x: x,
y: y,
};
}
}
const shuffledCoordinates = Array.from(
Array(sidePiecesCount * sidePiecesCount).keys(),
);
const swap = (a, i, j) => {
const tmp = a[i];
a[i] = a[j];
a[j] = tmp;
};
const shuffle = (a) => {
let i = a.length - 1;
while (i > 0) {
const j = Math.floor(Math.random() * i);
swap(a, i, j);
i--;
}
};
shuffle(shuffledCoordinates);
console.log("Coordinates shuffled ! 🥳");
console.log("now serving on port 2707. 🫡");
for (let x = 0; x < shuffledCoordinates.length; x++) {
app.get(`/piece/${x}`, (req, res) => {
console.log(`piece ${x} requested 🤖`);
res.send(piecesMap[shuffledCoordinates[x]]);
});
}
exports.app = app;
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