mgsc

index.js

const request = require('request-promise-native');
const {createCanvas, loadImage} = require('canvas');
const fs = require('fs');
const path = require('path');

const wr_id = process.argv[2];

if( !wr_id ) {
	console.error('USAGE : node index [wr_id]');
	process.exit(1);
}

request('https://mangashow2.me/bbs/board.php?bo_table=msm_manga&wr_id=' + wr_id).then( (html)=>{
	let vcnt, images, chapter, seed, title;
	const CX = 5, CY = 5;
	function __v(){
		if(chapter < 554714){
			const e = 1e4 * Math.sin(seed++);
			return Math.floor(1e5 * (e - Math.floor(e)));
		}
		seed++;
		let t = 100 * Math.sin(10 * seed), n = 1e3 * Math.cos(13 * seed), a = 1e4 * Math.tan(14 * seed);
		return t = Math.floor(100 * (t - Math.floor(t))), n = Math.floor(1e3 * (n - Math.floor(n))), a = Math.floor(1e4 * (a - Math.floor(a))), t + n + a;
	}
	const viewcntPat = /var view_cnt = ([0-9]+);/g;
	const chapterPat = /var chapter = ([0-9]+);/g;
	const imgListPat = /var img_list = (\[[^\]]+\]);/g;
	const titlePat = /<title>(.+)<\/title>/g;
	let tmp = viewcntPat.exec(html);
	if(tmp){
		vcnt = tmp[1];
		console.log(`view_cnt : ${vcnt}`);
	}
	tmp = chapterPat.exec(html);
	if(tmp){
		chapter = tmp[1];
		console.log(`chapter : ${chapter}`);
	}
	tmp = titlePat.exec(html);
	if(tmp){
		title = tmp[1];
		console.log(`title : ${title}`);
	}
	tmp = imgListPat.exec(html);
	if(tmp){
		images = JSON.parse(tmp[1]);
		console.log('images');
		console.dir(images);
	}
	
	seed = vcnt / 10;

	for(d = [], m = 0; m < 25; m++){
		d.push([m, __v()]);
	}
	d = d.sort( (e,t)=>{
		return (e[1] - t[1]) || (e[0] - t[0]);
	});

	const outdir = path.resolve(__dirname, 'images', title);
	if( !fs.existsSync( outdir ) ){
		fs.mkdirSync(outdir);
	}

	images.forEach( (url,i)=>{
		loadImage(url).then( img => {
			const iw = img.width, ih = img.height;
			const dw = Math.floor(iw / CX), dh = Math.floor(ih / CY);
			const canv = createCanvas(iw, ih);
			const ctx = canv.getContext('2d');

			const u = dw, g = dh, a=0;
				for (let p in d) {
					var h = p % CX, _ = Math.floor(p / CX), f = d[p][0] % CX, v = Math.floor(d[p][0] / CX), s = 1 == a ? -r / 2 : 0;
					ctx.drawImage(img, h * u, _ * g, u, g, f * u + s, v * g, u, g);
				}
			const out = fs.createWriteStream(path.resolve(outdir, `${('0000'+i).substr(-4)}.png`));
			canv.createPNGStream().pipe(out);
		});
	});
});

package.json

{
  "name": "mangashowmecroller",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "canvas": "^2.3.1",
    "request": "^2.88.0",
    "request-promise-native": "^1.0.7"
  }
}