100 lines
2.5 KiB
TypeScript
100 lines
2.5 KiB
TypeScript
import fs from "fs";
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import path from "path";
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import { execFileSync } from "child_process";
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import { createCanvas } from "canvas";
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import { Grid, copyGrid, Color } from "@snk/types/grid";
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import { Snake } from "@snk/types/snake";
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import {
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Options as DrawOptions,
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drawLerpWorld,
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getCanvasWorldSize,
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} from "@snk/draw/drawWorld";
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import type { Point } from "@snk/types/point";
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import { step } from "@snk/solver/step";
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import tmp from "tmp";
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import gifsicle from "gifsicle";
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// @ts-ignore
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import GIFEncoder from "gif-encoder-2";
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const withTmpDir = async <T>(
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handler: (dir: string) => Promise<T>
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): Promise<T> => {
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const { name: dir, removeCallback: cleanUp } = tmp.dirSync({
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unsafeCleanup: true,
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});
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try {
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return await handler(dir);
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} finally {
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cleanUp();
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}
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};
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export type AnimationOptions = { frameDuration: number; step: number };
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export const createGif = async (
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grid0: Grid,
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cells: Point[] | null,
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chain: Snake[],
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drawOptions: DrawOptions,
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animationOptions: AnimationOptions
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) =>
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withTmpDir(async (dir) => {
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const { width, height } = getCanvasWorldSize(grid0, drawOptions);
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const canvas = createCanvas(width, height);
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const ctx = canvas.getContext("2d") as any as CanvasRenderingContext2D;
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const grid = copyGrid(grid0);
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const stack: Color[] = [];
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const encoder = new GIFEncoder(width, height, "neuquant", true);
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encoder.setRepeat(0);
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encoder.setDelay(animationOptions.frameDuration);
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encoder.start();
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for (let i = 0; i < chain.length; i += 1) {
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const snake0 = chain[i];
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const snake1 = chain[Math.min(chain.length - 1, i + 1)];
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step(grid, stack, snake0);
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for (let k = 0; k < animationOptions.step; k++) {
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ctx.clearRect(0, 0, width, height);
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ctx.fillStyle = "#fff";
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ctx.fillRect(0, 0, width, height);
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drawLerpWorld(
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ctx,
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grid,
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cells,
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snake0,
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snake1,
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stack,
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k / animationOptions.step,
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drawOptions
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);
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encoder.addFrame(ctx);
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}
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}
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const outFileName = path.join(dir, "out.gif");
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const optimizedFileName = path.join(dir, "out.optimized.gif");
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encoder.finish();
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fs.writeFileSync(outFileName, encoder.out.getData());
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execFileSync(
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gifsicle,
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[
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//
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"--optimize=3",
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"--color-method=diversity",
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"--colors=18",
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outFileName,
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["--output", optimizedFileName],
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].flat()
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);
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return fs.readFileSync(optimizedFileName);
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});
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