Updated and synchronized QrCode class's top-level documentation comment, in all languages.

c/qrcodegen.h

@@ -33,6 +33,22 @@ extern "C" {
 #endif
 
 
+/* 
+ * This library creates QR Code symbols, which is a type of two-dimension barcode.
+ * Invented by Denso Wave and described in the ISO/IEC 18004 standard.
+ * A QR Code structure is an immutable square grid of black and white cells.
+ * The library provides functions to create a QR Code from text or binary data.
+ * The library covers the QR Code Model 2 specification, supporting all versions (sizes)
+ * from 1 to 40, all 4 error correction levels, and 4 character encoding modes.
+ * 
+ * Ways to create a QR Code object:
+ * - High level: Take the payload data and call qrcodegen_encodeText() or qrcodegen_encodeBinary().
+ * - Low level: Custom-make the list of segments and call
+ *   qrcodegen_encodeSegments() or qrcodegen_encodeSegmentsAdvanced().
+ * (Note that all ways require supplying the desired error correction level and various byte buffers.)
+ */
+
+
 /*---- Enum and struct types----*/
 
 /* 

cpp/QrCode.hpp

@@ -32,10 +32,20 @@
 namespace qrcodegen {
 
 /* 
- * Represents an immutable square grid of black and white cells for a QR Code symbol, and
- * provides static functions to create a QR Code from user-supplied textual or binary data.
- * This class covers the QR Code Model 2 specification, supporting all versions (sizes)
+ * A QR Code symbol, which is a type of two-dimension barcode.
+ * Invented by Denso Wave and described in the ISO/IEC 18004 standard.
+ * Instances of this class represent an immutable square grid of black and white cells.
+ * The class provides static factory functions to create a QR Code from text or binary data.
+ * The class covers the QR Code Model 2 specification, supporting all versions (sizes)
  * from 1 to 40, all 4 error correction levels, and 4 character encoding modes.
+ * 
+ * Ways to create a QR Code object:
+ * - High level: Take the payload data and call QrCode::encodeText() or QrCode::encodeBinary().
+ * - Mid level: Custom-make the list of segments and call QrCode::encodeSegments().
+ * - Low level: Custom-make the array of data codeword bytes (including
+ *   segment headers and final padding, excluding error correction codewords),
+ *   supply the appropriate version number, and call the QrCode() constructor.
+ * (Note that all ways require supplying the desired error correction level.)
  */
 class QrCode final {
 	

java/io/nayuki/qrcodegen/QrCode.java

@@ -30,10 +30,24 @@ import java.util.Objects;
 
 
 /**
- * Represents an immutable square grid of black and white cells for a QR Code symbol, and
- * provides static functions to create a QR Code from user-supplied textual or binary data.
- * <p>This class covers the QR Code Model 2 specification, supporting all versions (sizes)
+ * A QR Code symbol, which is a type of two-dimension barcode.
+ * Invented by Denso Wave and described in the ISO/IEC 18004 standard.
+ * <p>Instances of this class represent an immutable square grid of black and white cells.
+ * The class provides static factory functions to create a QR Code from text or binary data.
+ * The class covers the QR Code Model 2 specification, supporting all versions (sizes)
  * from 1 to 40, all 4 error correction levels, and 4 character encoding modes.</p>
+ * <p>Ways to create a QR Code object:</p>
+ * <ul>
+ *   <li><p>High level: Take the payload data and call {@link QrCode#encodeText(String,Ecc)}
+ *     or {@link QrCode#encodeBinary(byte[],Ecc)}.</p></li>
+ *   <li><p>Mid level: Custom-make the list of {@link QrSegment segments}
+ *     and call {@link QrCode#encodeSegments(List,Ecc)} or
+ *     {@link QrCode#encodeSegments(List,Ecc,int,int,int,boolean)}</p></li>
+ *   <li><p>Low level: Custom-make the array of data codeword bytes (including segment headers and
+ *     final padding, excluding error correction codewords), supply the appropriate version number,
+ *     and call the {@link QrCode#QrCode(int,Ecc,byte[],int) constructor}.</p></li>
+ * </ul>
+ * <p>(Note that all ways require supplying the desired error correction level.)</p>
  */
 public final class QrCode {
 	

javascript/qrcodegen.js

@@ -60,10 +60,21 @@ var qrcodegen = new function() {
 	/*---- QR Code symbol class ----*/
 	
 	/* 
-	 * A class that represents an immutable square grid of black and white cells for a QR Code symbol,
-	 * and provides static functions to create a QR Code from user-supplied textual or binary data.
-	 * This class covers the QR Code Model 2 specification, supporting all versions (sizes)
+	 * A class that represents a QR Code symbol, which is a type of two-dimension barcode.
+	 * Invented by Denso Wave and described in the ISO/IEC 18004 standard.
+	 * Instances of this class represent an immutable square grid of black and white cells.
+	 * The class provides static factory functions to create a QR Code from text or binary data.
+	 * The class covers the QR Code Model 2 specification, supporting all versions (sizes)
 	 * from 1 to 40, all 4 error correction levels, and 4 character encoding modes.
+	 * 
+	 * Ways to create a QR Code object:
+	 * - High level: Take the payload data and call QrCode.encodeText() or QrCode.encodeBinary().
+	 * - Mid level: Custom-make the list of segments and call QrCode.encodeSegments().
+	 * - Low level: Custom-make the array of data codeword bytes (including
+	 *   segment headers and final padding, excluding error correction codewords),
+	 *   supply the appropriate version number, and call the QrCode() constructor.
+	 * (Note that all ways require supplying the desired error correction level.)
+	 * 
 	 * This constructor creates a new QR Code with the given version number, error correction level, binary data array,
 	 * and mask number. mask = -1 is for automatic choice, or 0 to 7 for fixed choice. This is a cumbersome low-level constructor
 	 * that should not be invoked directly by the user. To go one level up, see the QrCode.encodeSegments() function.

python/qrcodegen.py

@@ -61,10 +61,20 @@ This module "qrcodegen", public members:
 # ---- QR Code symbol class ----
 
 class QrCode(object):
-	"""Represents an immutable square grid of black and white cells for a QR Code symbol, and
-	provides static functions to create a QR Code from user-supplied textual or binary data.
-	This class covers the QR Code Model 2 specification, supporting all versions (sizes)
-	from 1 to 40, all 4 error correction levels, and 4 character encoding modes."""
+	"""A QR Code symbol, which is a type of two-dimension barcode.
+	Invented by Denso Wave and described in the ISO/IEC 18004 standard.
+	Instances of this class represent an immutable square grid of black and white cells.
+	The class provides static factory functions to create a QR Code from text or binary data.
+	The class covers the QR Code Model 2 specification, supporting all versions (sizes)
+	from 1 to 40, all 4 error correction levels, and 4 character encoding modes.
+	
+	Ways to create a QR Code object:
+	- High level: Take the payload data and call QrCode.encode_text() or QrCode.encode_binary().
+	- Mid level: Custom-make the list of segments and call QrCode.encode_segments().
+	- Low level: Custom-make the array of data codeword bytes (including
+	  segment headers and final padding, excluding error correction codewords),
+	  supply the appropriate version number, and call the QrCode() constructor.
+	(Note that all ways require supplying the desired error correction level.)"""
 	
 	# ---- Static factory functions (high level) ----
 	

rust/src/lib.rs

@@ -24,10 +24,23 @@
 
 /*---- QrCode functionality ----*/
 
-// Represents an immutable square grid of black and white cells for a QR Code symbol, and
-// provides static functions to create a QR Code from user-supplied textual or binary data.
-// This struct and impl cover the QR Code Model 2 specification, supporting all versions
-// (sizes) from 1 to 40, all 4 error correction levels, and 4 character encoding modes.
+/* 
+ * A QR Code symbol, which is a type of two-dimension barcode.
+ * Invented by Denso Wave and described in the ISO/IEC 18004 standard.
+ * Instances of this struct represent an immutable square grid of black and white cells.
+ * The impl provides static factory functions to create a QR Code from text or binary data.
+ * The struct and impl cover the QR Code Model 2 specification, supporting all versions
+ * (sizes) from 1 to 40, all 4 error correction levels, and 4 character encoding modes.
+ * 
+ * Ways to create a QR Code object:
+ * - High level: Take the payload data and call QrCode::encode_text() or QrCode::encode_binary().
+ * - Mid level: Custom-make the list of segments and call
+ *   QrCode.encode_segments() or QrCode.encode_segments_advanced().
+ * - Low level: Custom-make the array of data codeword bytes (including segment
+ *   headers and final padding, excluding error correction codewords), supply the
+ *   appropriate version number, and call the QrCode::encode_codewords() constructor.
+ * (Note that all ways require supplying the desired error correction level.)
+ */
 #[derive(Clone)]
 pub struct QrCode {
 	

typescript/qrcodegen.ts

@@ -34,10 +34,21 @@ namespace qrcodegen {
 	/*---- QR Code symbol class ----*/
 	
 	/* 
-	 * Represents an immutable square grid of black and white cells for a QR Code symbol, and
-	 * provides static functions to create a QR Code from user-supplied textual or binary data.
-	 * This class covers the QR Code Model 2 specification, supporting all versions (sizes)
+	 * A QR Code symbol, which is a type of two-dimension barcode.
+	 * Invented by Denso Wave and described in the ISO/IEC 18004 standard.
+	 * Instances of this class represent an immutable square grid of black and white cells.
+	 * The class provides static factory functions to create a QR Code from text or binary data.
+	 * The class covers the QR Code Model 2 specification, supporting all versions (sizes)
 	 * from 1 to 40, all 4 error correction levels, and 4 character encoding modes.
+	 * 
+	 * Ways to create a QR Code object:
+	 * - High level: Take the payload data and call QrCode.encodeText() or QrCode.encodeBinary().
+	 * - Mid level: Custom-make the list of segments and call QrCode.encodeSegments().
+	 * - Low level: Custom-make the array of data codeword bytes (including
+	 *   segment headers and final padding, excluding error correction codewords),
+	 *   supply the appropriate version number, and call the QrCode() constructor.
+	 * (Note that all ways require supplying the desired error correction level.)
+	 * 
 	 * This constructor creates a new QR Code with the given version number, error correction level, binary data array,
 	 * and mask number. mask = -1 is for automatic choice, or 0 to 7 for fixed choice. This is a cumbersome low-level constructor
 	 * that should not be invoked directly by the user. To go one level up, see the QrCode.encodeSegments() function.