Added lisapresentation

src/module/montage/lisa-presentation.js

@@ -0,0 +1,66 @@
+const { createCanvas, loadImage, registerFont } = require('canvas');
+registerFont(`${__dirname}/../../assets/fonts/Noto-Regular.ttf`, { family: 'Noto' });
+registerFont(`${__dirname}/../../assets/fonts/Noto-Emoji.ttf`, { family: 'Noto' });
+const path = require("path");
+
+function wrapText(ctx, text, maxWidth) {
+	return new Promise(resolve => {
+		if (ctx.measureText(text).width < maxWidth) return resolve([text]);
+		if (ctx.measureText('W').width > maxWidth) return resolve(null);
+		const words = text.split(' ');
+		const lines = [];
+		let line = '';
+		while (words.length > 0) {
+			let split = false;
+			while (ctx.measureText(words[0]).width >= maxWidth) {
+				const temp = words[0];
+				words[0] = temp.slice(0, -1);
+				if (split) {
+					words[1] = `${temp.slice(-1)}${words[1]}`;
+				}
+				else {
+					split = true;
+					words.splice(1, 0, temp.slice(-1));
+				}
+			}
+			if (ctx.measureText(`${line}${words[0]}`).width < maxWidth) {
+				line += `${words.shift()} `;
+			}
+			else {
+				lines.push(line.trim());
+				line = '';
+			}
+			if (words.length === 0) lines.push(line.trim());
+		}
+		return resolve(lines);
+	});
+}
+
+module.exports = class LisaPresentation {
+
+  async getImage(text) {
+          if (!text || text.length > 300) throw new Error(`You must provide a text of 300 characters or less.`)
+
+          const base = await loadImage(path.join(`${__dirname}/../../assets/lisa-presentation.png`));
+          const canvas = createCanvas(base.width, base.height);
+          const ctx = canvas.getContext('2d');
+          ctx.drawImage(base, 0, 0);
+          ctx.textAlign = 'center';
+          ctx.textBaseline = 'top';
+          ctx.font = '40px Noto';
+          let fontSize = 40;
+          while (ctx.measureText(text).width > 1320) {
+            fontSize -= 1;
+            ctx.font = `${fontSize}px Noto`;
+          }
+          const lines = await wrapText(ctx, text, 330);
+          const topMost = 185 - (((fontSize * lines.length) / 2) + ((20 * (lines.length - 1)) / 2));
+          for (let i = 0; i < lines.length; i++) {
+            const height = topMost + ((fontSize + 20) * i);
+            ctx.fillText(lines[i], base.width / 2, height);
+          }
+
+          return canvas.toBuffer();
+      }
+
+}