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10-svg.js
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10-svg.js
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// whenever you are ready, build the SVGs using the list of
// indices contained in "output/valid.txt"
const fs = require("fs");
const SVG = require("rabbit-ear-svg");
const timestamp = require("./timestamp")();
timestamp.begin();
const outputDir = "./output";
fs.existsSync(outputDir) || fs.mkdirSync(outputDir);
const SIZE = 20;
const creaseCoords = [
[0, 0, SIZE, 0],
[0, 0, SIZE, SIZE],
[0, 0, 0, SIZE],
[0, 0, -SIZE, SIZE],
[0, 0, -SIZE, 0],
[0, 0, -SIZE, -SIZE],
[0, 0, 0, -SIZE],
[0, 0, SIZE, -SIZE],
];
const foldAngleStrokes = {
a: "#00f", // "#00ff",
b: "#00f", // "#00f8",
c: "#fff", // "#fff0",
d: "#f00", // "#f008",
e: "#f00", // "#f00f",
};
const foldAngleOpacities = {
a: "1.0",
b: "0.5",
c: "1.0",
d: "0.5",
e: "1.0",
};
const drawPermutation = (perm) => {
const svg = SVG(-SIZE, -SIZE, SIZE * 2, SIZE * 2);
Array.from(perm).map((letter, i) => {
if (letter !== "c") {
svg.line(...creaseCoords[i])
.stroke(foldAngleStrokes[letter])
.opacity(foldAngleOpacities[letter]);
}
});
svg.rect(-SIZE, -SIZE, SIZE*2, SIZE*2)
.fill("none")
.stroke("#000");
return svg.save();
}
const svgDir = outputDir + "/svgs";
fs.existsSync(svgDir) || fs.mkdirSync(svgDir);
fs.existsSync(svgDir + "/3D") || fs.mkdirSync(svgDir + "/3D");
fs.existsSync(svgDir + "/flat") || fs.mkdirSync(svgDir + "/flat");
const valid = fs
.readFileSync("output/valid.txt", "utf-8")
.split("\n");
const validMap = {};
valid.forEach(i => { validMap[i] = true; });
const flat = fs
.readFileSync("output/flat-foldable.txt", "utf-8")
.split("\n");
const flatMap = {};
flat.forEach(i => { flatMap[i] = true; });
const validPermutations = fs
.readFileSync("output/permutations.txt", "utf-8")
.split("\n")
.filter((_, i) => validMap[i]);
validPermutations.forEach((perm, i) => {
const svg = drawPermutation(perm);
const dir = flatMap[valid[i]] === true
? `${svgDir}/flat`
: `${svgDir}/3D`;
fs.writeFileSync(`${dir}/${valid[i]}.svg`, svg);
});
const endTime = timestamp.end(`wrote ${validPermutations.length} svgs`);
console.log(`finished in ${endTime[0]}.${endTime[1]} seconds`);