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226 lines
9.2 KiB
226 lines
9.2 KiB
/*
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* QR Code generator input demo (TypeScript)
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*
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* Copyright (c) Project Nayuki. (MIT License)
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* https://www.nayuki.io/page/qr-code-generator-library
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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* - The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* - The Software is provided "as is", without warranty of any kind, express or
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* implied, including but not limited to the warranties of merchantability,
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* fitness for a particular purpose and noninfringement. In no event shall the
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* authors or copyright holders be liable for any claim, damages or other
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* liability, whether in an action of contract, tort or otherwise, arising from,
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* out of or in connection with the Software or the use or other dealings in the
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* Software.
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*/
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"use strict";
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namespace app {
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function initialize(): void {
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getElem("loading").style.display = "none";
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getElem("loaded").style.removeProperty("display");
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let elems = document.querySelectorAll("input[type=number], input[type=text], textarea");
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for (let el of elems) {
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if (el.id.indexOf("version-") != 0)
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(el as any).oninput = redrawQrCode;
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}
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elems = document.querySelectorAll("input[type=radio], input[type=checkbox]");
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for (let el of elems)
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(el as HTMLInputElement).onchange = redrawQrCode;
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redrawQrCode();
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}
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function redrawQrCode(): void {
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// Show/hide rows based on bitmap/vector image output
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const bitmapOutput: boolean = getInput("output-format-bitmap").checked;
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const scaleRow : HTMLElement = getElem("scale-row");
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let download = getElem("download") as HTMLAnchorElement;
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if (bitmapOutput) {
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scaleRow.style.removeProperty("display");
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download.download = "qr-code.png";
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} else {
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scaleRow.style.display = "none";
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download.download = "qr-code.svg";
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}
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download.removeAttribute("href");
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// Reset output images in case of early termination
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const canvas = getElem("qrcode-canvas") as HTMLCanvasElement;
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const svg = (document.getElementById("qrcode-svg") as Element) as SVGElement;
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canvas.style.display = "none";
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svg.style.display = "none";
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// Returns a QrCode.Ecc object based on the radio buttons in the HTML form.
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function getInputErrorCorrectionLevel(): qrcodegen.QrCode.Ecc {
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if (getInput("errcorlvl-medium").checked)
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return qrcodegen.QrCode.Ecc.MEDIUM;
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else if (getInput("errcorlvl-quartile").checked)
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return qrcodegen.QrCode.Ecc.QUARTILE;
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else if (getInput("errcorlvl-high").checked)
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return qrcodegen.QrCode.Ecc.HIGH;
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else // In case no radio button is depressed
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return qrcodegen.QrCode.Ecc.LOW;
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}
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// Get form inputs and compute QR Code
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const ecl: qrcodegen.QrCode.Ecc = getInputErrorCorrectionLevel();
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const text: string = (getElem("text-input") as HTMLTextAreaElement).value;
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const segs: Array<qrcodegen.QrSegment> = qrcodegen.QrSegment.makeSegments(text);
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const minVer: number = parseInt(getInput("version-min-input").value, 10);
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const maxVer: number = parseInt(getInput("version-max-input").value, 10);
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const mask: number = parseInt(getInput("mask-input").value, 10);
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const boostEcc: boolean = getInput("boost-ecc-input").checked;
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const qr: qrcodegen.QrCode = qrcodegen.QrCode.encodeSegments(segs, ecl, minVer, maxVer, mask, boostEcc);
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// Draw image output
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const border: number = parseInt(getInput("border-input").value, 10);
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const lightColor: string = getInput("light-color-input").value;
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const darkColor : string = getInput("dark-color-input" ).value;
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if (border < 0 || border > 100)
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return;
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if (bitmapOutput) {
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const scale: number = parseInt(getInput("scale-input").value, 10);
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if (scale <= 0 || scale > 30)
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return;
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drawCanvas(qr, scale, border, lightColor, darkColor, canvas);
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canvas.style.removeProperty("display");
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download.href = canvas.toDataURL("image/png");
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} else {
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const code: string = toSvgString(qr, border, lightColor, darkColor);
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const viewBox: string = (/ viewBox="([^"]*)"/.exec(code) as RegExpExecArray)[1];
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const pathD: string = (/ d="([^"]*)"/.exec(code) as RegExpExecArray)[1];
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svg.setAttribute("viewBox", viewBox);
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(svg.querySelector("path") as Element).setAttribute("d", pathD);
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(svg.querySelector("rect") as Element).setAttribute("fill", lightColor);
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(svg.querySelector("path") as Element).setAttribute("fill", darkColor);
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svg.style.removeProperty("display");
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download.href = "data:application/svg+xml," + encodeURIComponent(code);
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}
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// Returns a string to describe the given list of segments.
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function describeSegments(segs: Array<qrcodegen.QrSegment>): string {
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if (segs.length == 0)
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return "none";
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else if (segs.length == 1) {
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const mode: qrcodegen.QrSegment.Mode = segs[0].mode;
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const Mode = qrcodegen.QrSegment.Mode;
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if (mode == Mode.NUMERIC ) return "numeric";
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if (mode == Mode.ALPHANUMERIC) return "alphanumeric";
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if (mode == Mode.BYTE ) return "byte";
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if (mode == Mode.KANJI ) return "kanji";
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return "unknown";
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} else
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return "multiple";
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}
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// Returns the number of Unicode code points in the given UTF-16 string.
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function countUnicodeChars(str: string): number {
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let result: number = 0;
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for (const ch of str) {
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const cc = ch.codePointAt(0) as number;
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if (0xD800 <= cc && cc < 0xE000)
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throw new RangeError("Invalid UTF-16 string");
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result++;
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}
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return result;
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}
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// Show the QR Code symbol's statistics as a string
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getElem("statistics-output").textContent = `QR Code version = ${qr.version}, ` +
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`mask pattern = ${qr.mask}, ` +
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`character count = ${countUnicodeChars(text)},\n` +
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`encoding mode = ${describeSegments(segs)}, ` +
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`error correction = level ${"LMQH".charAt(qr.errorCorrectionLevel.ordinal)}, ` +
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`data bits = ${qrcodegen.QrSegment.getTotalBits(segs, qr.version) as number}.`;
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}
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// Draws the given QR Code, with the given module scale and border modules, onto the given HTML
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// canvas element. The canvas's width and height is resized to (qr.size + border * 2) * scale.
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// The drawn image is purely dark and light, and fully opaque.
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// The scale must be a positive integer and the border must be a non-negative integer.
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function drawCanvas(qr: qrcodegen.QrCode, scale: number, border: number, lightColor: string, darkColor: string, canvas: HTMLCanvasElement): void {
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if (scale <= 0 || border < 0)
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throw new RangeError("Value out of range");
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const width: number = (qr.size + border * 2) * scale;
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canvas.width = width;
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canvas.height = width;
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let ctx = canvas.getContext("2d") as CanvasRenderingContext2D;
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for (let y = -border; y < qr.size + border; y++) {
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for (let x = -border; x < qr.size + border; x++) {
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ctx.fillStyle = qr.getModule(x, y) ? darkColor : lightColor;
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ctx.fillRect((x + border) * scale, (y + border) * scale, scale, scale);
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}
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}
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}
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// Returns a string of SVG code for an image depicting the given QR Code, with the given number
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// of border modules. The string always uses Unix newlines (\n), regardless of the platform.
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function toSvgString(qr: qrcodegen.QrCode, border: number, lightColor: string, darkColor: string): string {
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if (border < 0)
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throw new RangeError("Border must be non-negative");
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let parts: Array<string> = [];
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for (let y = 0; y < qr.size; y++) {
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for (let x = 0; x < qr.size; x++) {
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if (qr.getModule(x, y))
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parts.push(`M${x + border},${y + border}h1v1h-1z`);
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}
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}
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return `<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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<svg xmlns="http://www.w3.org/2000/svg" version="1.1" viewBox="0 0 ${qr.size + border * 2} ${qr.size + border * 2}" stroke="none">
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<rect width="100%" height="100%" fill="${lightColor}"/>
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<path d="${parts.join(" ")}" fill="${darkColor}"/>
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</svg>
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`;
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}
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export function handleVersionMinMax(which: "min"|"max"): void {
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const minElem: HTMLInputElement = getInput("version-min-input");
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const maxElem: HTMLInputElement = getInput("version-max-input");
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let minVal: number = parseInt(minElem.value, 10);
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let maxVal: number = parseInt(maxElem.value, 10);
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minVal = Math.max(Math.min(minVal, qrcodegen.QrCode.MAX_VERSION), qrcodegen.QrCode.MIN_VERSION);
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maxVal = Math.max(Math.min(maxVal, qrcodegen.QrCode.MAX_VERSION), qrcodegen.QrCode.MIN_VERSION);
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if (which == "min" && minVal > maxVal)
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maxVal = minVal;
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else if (which == "max" && maxVal < minVal)
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minVal = maxVal;
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minElem.value = minVal.toString();
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maxElem.value = maxVal.toString();
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redrawQrCode();
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}
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function getElem(id: string): HTMLElement {
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const result: HTMLElement|null = document.getElementById(id);
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if (result instanceof HTMLElement)
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return result;
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throw new Error("Assertion error");
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}
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function getInput(id: string): HTMLInputElement {
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const result: HTMLElement = getElem(id);
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if (result instanceof HTMLInputElement)
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return result;
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throw new Error("Assertion error");
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}
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initialize();
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}
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