Added a working demo example program in Rust.

rust/examples/qrcodegen-demo.rs

@@ -0,0 +1,166 @@
+/* 
+ * QR Code generator demo (Rust)
+ * 
+ * Run this command-line program with no arguments. The program computes a bunch of demonstration
+ * QR Codes and prints them to the console. Also, the SVG code for one QR Code is printed as a sample.
+ * 
+ * Copyright (c) Project Nayuki. (MIT License)
+ * https://www.nayuki.io/page/qr-code-generator-library
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ * - The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ * - The Software is provided "as is", without warranty of any kind, express or
+ *   implied, including but not limited to the warranties of merchantability,
+ *   fitness for a particular purpose and noninfringement. In no event shall the
+ *   authors or copyright holders be liable for any claim, damages or other
+ *   liability, whether in an action of contract, tort or otherwise, arising from,
+ *   out of or in connection with the Software or the use or other dealings in the
+ *   Software.
+ */
+
+extern crate qrcodegen;
+use qrcodegen::QrCode;
+use qrcodegen::QrCodeEcc;
+use qrcodegen::QrCodeEcc_LOW;
+use qrcodegen::QrCodeEcc_MEDIUM;
+use qrcodegen::QrCodeEcc_QUARTILE;
+use qrcodegen::QrCodeEcc_HIGH;
+use qrcodegen::QrSegment;
+
+
+// The main application program.
+fn main() {
+	do_basic_demo();
+	do_variety_demo();
+	do_segment_demo();
+}
+
+
+// Creates a single QR Code, then prints it to the console.
+fn do_basic_demo() {
+	let text: &'static str = "Hello, world!";  // User-supplied Unicode text
+	let errcorlvl: &'static QrCodeEcc = &QrCodeEcc_LOW;  // Error correction level
+	
+	// Make and print the QR Code symbol
+	let qr: QrCode = QrCode::encode_text(text, errcorlvl);
+	print_qr(&qr);
+	println!("{}", qr.to_svg_string(4));
+}
+
+
+// Creates a variety of QR Codes that exercise different features of the library, and prints each one to the console.
+fn do_variety_demo() {
+	// Project Nayuki URL
+	let qr = QrCode::encode_text("https://www.nayuki.io/", &QrCodeEcc_HIGH);
+	let qr = QrCode::remask(&qr, 3);  // Change mask, forcing to mask #3
+	print_qr(&qr);
+	
+	// Numeric mode encoding (3.33 bits per digit)
+	let qr = QrCode::encode_text("314159265358979323846264338327950288419716939937510", &QrCodeEcc_MEDIUM);
+	print_qr(&qr);
+	
+	// Alphanumeric mode encoding (5.5 bits per character)
+	let qr = QrCode::encode_text("DOLLAR-AMOUNT:$39.87 PERCENTAGE:100.00% OPERATIONS:+-*/", &QrCodeEcc_HIGH);
+	print_qr(&qr);
+	
+	// Unicode text as UTF-8, and different masks
+	let qr = QrCode::encode_text("こんにちwa、世界！ αβγδ", &QrCodeEcc_QUARTILE);
+	print_qr(&QrCode::remask(&qr, 0));
+	print_qr(&QrCode::remask(&qr, 1));
+	print_qr(&QrCode::remask(&qr, 5));
+	print_qr(&QrCode::remask(&qr, 7));
+	
+	// Moderately large QR Code using longer text (from Lewis Carroll's Alice in Wonderland)
+	let qr = QrCode::encode_text(concat!(
+		"Alice was beginning to get very tired of sitting by her sister on the bank, ",
+		"and of having nothing to do: once or twice she had peeped into the book her sister was reading, ",
+		"but it had no pictures or conversations in it, 'and what is the use of a book,' thought Alice ",
+		"'without pictures or conversations?' So she was considering in her own mind (as well as she could, ",
+		"for the hot day made her feel very sleepy and stupid), whether the pleasure of making a ",
+		"daisy-chain would be worth the trouble of getting up and picking the daisies, when suddenly ",
+		"a White Rabbit with pink eyes ran close by her."), &QrCodeEcc_HIGH);
+	print_qr(&qr);
+}
+
+
+// Creates QR Codes with manually specified segments for better compactness.
+fn do_segment_demo() {
+	// Illustration "silver"
+	let silver0 = "THE SQUARE ROOT OF 2 IS 1.";
+	let silver1 = "41421356237309504880168872420969807856967187537694807317667973799";
+	let qr = QrCode::encode_text(&[silver0, silver1].concat(), &QrCodeEcc_LOW);
+	print_qr(&qr);
+	
+	let segs = vec![
+		QrSegment::make_alphanumeric(&to_chars(silver0)),
+		QrSegment::make_numeric(&to_chars(silver1)),
+	];
+	let qr = QrCode::encode_segments(&segs, &QrCodeEcc_LOW);
+	print_qr(&qr);
+	
+	// Illustration "golden"
+	let golden0 = "Golden ratio φ = 1.";
+	let golden1 = "6180339887498948482045868343656381177203091798057628621354486227052604628189024497072072041893911374";
+	let golden2 = "......";
+	let qr = QrCode::encode_text(&[golden0, golden1, golden2].concat(), &QrCodeEcc_LOW);
+	print_qr(&qr);
+	
+	let segs = vec![
+		QrSegment::make_bytes(golden0.as_bytes()),
+		QrSegment::make_numeric(&to_chars(golden1)),
+		QrSegment::make_alphanumeric(&to_chars(golden2)),
+	];
+	let qr = QrCode::encode_segments(&segs, &QrCodeEcc_LOW);
+	print_qr(&qr);
+	
+	// Illustration "Madoka": kanji, kana, Greek, Cyrillic, full-width Latin characters
+	let madoka = "「魔法少女まどか☆マギカ」って、　ИАИ　ｄｅｓｕ　κα？";
+	let qr = QrCode::encode_text(madoka, &QrCodeEcc_LOW);
+	print_qr(&qr);
+	
+	let kanjichars: Vec<u32> = vec![  // Kanji mode encoding (13 bits per character)
+		0x0035, 0x1002, 0x0FC0, 0x0AED, 0x0AD7,
+		0x015C, 0x0147, 0x0129, 0x0059, 0x01BD,
+		0x018D, 0x018A, 0x0036, 0x0141, 0x0144,
+		0x0001, 0x0000, 0x0249, 0x0240, 0x0249,
+		0x0000, 0x0104, 0x0105, 0x0113, 0x0115,
+		0x0000, 0x0208, 0x01FF, 0x0008,
+	];
+	let mut bb: Vec<bool> = Vec::new();
+	for c in &kanjichars {
+		qrcodegen::append_bits(&mut bb, *c, 13);
+	}
+	let segs = vec![
+		QrSegment::new(&qrcodegen::QrSegmentMode_KANJI, kanjichars.len(), bb),
+	];
+	let qr = QrCode::encode_segments(&segs, &QrCodeEcc_LOW);
+	print_qr(&qr);
+}
+
+
+/*---- Utilities ----*/
+
+// Prints the given QrCode object to the console.
+fn print_qr(qr: &QrCode) {
+	let border: i32 = 4;
+	for y in -border .. qr.size() + border {
+		for x in -border .. qr.size() + border {
+			let c: char = if qr.get_module(x, y) { '\u{2588}' } else { ' ' };
+			print!("{0}{0}", c);
+		}
+		println!();
+	}
+	println!();
+}
+
+
+// Converts the given borrowed string slice to a new character vector.
+fn to_chars(text: &str) -> Vec<char> {
+	text.chars().collect()
+}