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Update to rough.js 4.0.1 (#363)

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* upgrade to latest rough.js

* remove random.ts because roughjs now supports seeding.
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Preet 2020-01-13 11:04:28 -08:00 • committed by Christopher Chedeau
parent bc2bae2a9a
commit 8dbd1b80df
7 changed files with 66 additions and 96 deletions
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18
src/random.ts
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@ -1,18 +0,0 @@
// https://stackoverflow.com/questions/521295/seeding-the-random-number-generator-in-javascript/47593316#47593316
export const LCG = (seed: number) => () =>
((2 ** 31 - 1) & (seed = Math.imul(48271, seed))) / 2 ** 31;
export function randomSeed() {
return Math.floor(Math.random() * 2 ** 31);
}
// Unfortunately, roughjs doesn't support a seed attribute (https://github.com/pshihn/rough/issues/27).
// We can achieve the same result by overriding the Math.random function with a
// pseudo random generator that supports a random seed and swapping it back after.
export function withCustomMathRandom<T>(seed: number, cb: () => T): T {
const random = Math.random;
Math.random = LCG(seed);
const result = cb();
Math.random = random;
return result;
}