Kemas M. Aryadary Rasyad
99 lines
3.5 KiB
TypeScript
99 lines
3.5 KiB
TypeScript
import { resolveFileUrl } from "./resolveFileFromUrl";
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import QRCode from "qrcode";
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//LOAD IMAGE TEMPLATE
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function loadImage(src: string): Promise<HTMLImageElement> {
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return new Promise((resolve, reject) => {
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const img = new Image();
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if (!src.startsWith("data:")) img.crossOrigin = "anonymous";
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img.onload = () => resolve(img);
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img.onerror = () => reject(new Error(`Gagal load gambar: ${src}`));
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img.src = resolveFileUrl(src);
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});
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}
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//LOAD FONT UNTUK MENCEGAH FONT TERGANTI
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async function ensureFontsLoaded(): Promise<void> {
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await Promise.all([
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document.fonts.load('105px "Great Vibes"'),
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document.fonts.load('54px "Grenze"'),
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]);
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await document.fonts.ready;
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}
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// LAYOUT DEFAULT SERTIFIKAT YANG AKAN DIGENERATE
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const LAYOUT = {
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internName: { x: 0.54, y: 0.47, size: 130, font: "Great Vibes", color: "#800000" },
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internNameSmall: { x: 0.82, y: 0.889, size: 47, font: "Great Vibes", color: "#090909" },
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userposition: { x: 0.855, y: 0.557, size: 46, font: "Grenze", color: "#800000" },
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duration: { x: 0.7, y: 0.615, size: 48, font: "Grenze", color: "#090909" },
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certNo: { x: 0.56, y: 0.305, size: 50, font: "Grenze", color: "#090909" },
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certNoSmall: { x: 0.827, y: 0.92, size: 32, font: "Grenze", color: "#090909"},
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qr: { x: 0.772, y: 0.715, size: 0.103 },
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};
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// HELPER: kurangi ukuran font 25% jika nama melebihi 22 karakter (termasuk spasi)
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function fitNameText(name: string, baseSize: number): number {
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const SAFE_LENGTH = 24;
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const REDUCTION_PER_CHAR = 0.032;
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const MIN_SCALE = 0.75;
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const length = name.length;
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if (length <= SAFE_LENGTH) return baseSize;
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const scale = Math.max(1 - (length - SAFE_LENGTH) * REDUCTION_PER_CHAR, MIN_SCALE);
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return baseSize * scale;
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}
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//MAIN FUNCTION: generasi sertifikat intern formatted
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export async function generateCertificate(
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templateUrl: string,
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internName: string,
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userposition: string,
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certificateNo: string,
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ProjectDuration: string,
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verifyUrl: string,
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): Promise<Blob> {
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await ensureFontsLoaded();
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const img = await loadImage(templateUrl);
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const canvas = document.createElement("canvas");
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canvas.width = img.naturalWidth;
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canvas.height = img.naturalHeight;
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const ctx = canvas.getContext("2d")!;
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ctx.drawImage(img, 0, 0);
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ctx.textAlign = "center";
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ctx.textBaseline = "middle";
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const text = (
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cfg: { x: number; y: number; size: number; font: string; color: string },
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value: string,
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) => {
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const size = cfg === LAYOUT.internName ? fitNameText(value, cfg.size) : cfg.size;
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ctx.font = `400 ${size}px "${cfg.font}", serif`;
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ctx.fillStyle = cfg.color;
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ctx.fillText(value, canvas.width * cfg.x, canvas.height * cfg.y);
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};
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text(LAYOUT.internName, internName);
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text(LAYOUT.internNameSmall, internName);
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text(LAYOUT.userposition, userposition);
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text(LAYOUT.duration, ProjectDuration);
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text(LAYOUT.certNo, certificateNo);
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text(LAYOUT.certNoSmall, certificateNo);
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const qrSize = Math.round(canvas.width * LAYOUT.qr.size);
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const qrDataUrl = await QRCode.toDataURL(
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`${window.location.origin}/verify-certificate/${verifyUrl}`,
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{ width: qrSize, margin: 1 },
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);
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const qrImg = await loadImage(qrDataUrl);
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ctx.drawImage(qrImg, canvas.width * LAYOUT.qr.x, canvas.height * LAYOUT.qr.y, qrSize, qrSize);
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return new Promise((resolve, reject) => {
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canvas.toBlob(
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(blob) => (blob ? resolve(blob) : reject(new Error("toBlob gagal"))),
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"image/png",
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);
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});
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}
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