Adding Code39VINReader

src/barcode_decoder.js

@@ -7,6 +7,7 @@ define([
     'code_128_reader',
     'ean_reader',
     'code_39_reader',
+    'code_39_vin_reader',
     'codabar_reader',
     'upc_reader',
     'ean_8_reader',
@@ -17,17 +18,19 @@ define([
     Code128Reader,
     EANReader,
     Code39Reader,
+    Code39VINReader,
     CodabarReader,
     UPCReader,
     EAN8Reader,
     UPCEReader) {
     "use strict";
-    
+
     var readers = {
         code_128_reader: Code128Reader,
         ean_reader: EANReader,
         ean_8_reader: EAN8Reader,
         code_39_reader: Code39Reader,
+        code_39_vin_reader: Code39VINReader,
         codabar_reader: CodabarReader,
         upc_reader: UPCReader,
         upc_e_reader: UPCEReader
@@ -48,7 +51,7 @@ define([
                 },
                 _barcodeReaders = [],
                 _barcodeReader = null;
-            
+
             initCanvas();
             initReaders();
             initConfig();
@@ -113,9 +116,9 @@ define([
             }
 
             /**
-             * extend the line on both ends 
+             * extend the line on both ends
              * @param {Array} line
-             * @param {Number} angle 
+             * @param {Number} angle
              */
             function getExtendedLine(line, angle, ext) {
                 function extendLine(amount) {
@@ -141,7 +144,7 @@ define([
                 }
                 return line;
             }
-            
+
             function getLine(box) {
                 return [{
                     x : (box[1][0] - box[0][0]) / 2 + box[0][0],
@@ -151,12 +154,12 @@ define([
                     y : (box[3][1] - box[2][1]) / 2 + box[2][1]
                 }];
             }
-            
+
             function tryDecode(line) {
                 var result = null,
                     i,
                     barcodeLine = Bresenham.getBarcodeLine(inputImageWrapper, line[0], line[1]);
-                    
+
                 if (config.showFrequency) {
                     ImageDebug.drawPath(line, {x: 'x', y: 'y'}, _canvas.ctx.overlay, {color: 'red', lineWidth: 3});
                     Bresenham.debug.printFrequency(barcodeLine.line, _canvas.dom.frequency);
@@ -165,7 +168,7 @@ define([
                 if (config.showPattern) {
                     Bresenham.debug.printPattern(barcodeLine.line, _canvas.dom.pattern);
                 }
-                
+
                 for ( i = 0; i < _barcodeReaders.length && result === null; i++) {
                     result = _barcodeReaders[i].decodePattern(barcodeLine.line);
                     if (result !== null) {
@@ -179,15 +182,15 @@ define([
                     codeResult: result,
                     barcodeLine: barcodeLine
                 };
-                
+
             }
-            
+
             /**
              * This method slices the given area apart and tries to detect a barcode-pattern
              * for each slice. It returns the decoded barcode, or null if nothing was found
              * @param {Array} box
              * @param {Array} line
-             * @param {Number} lineAngle 
+             * @param {Number} lineAngle
              */
             function tryDecodeBruteForce(box, line, lineAngle) {
                 var sideLength = Math.sqrt(Math.pow(box[1][0] - box[0][0], 2) + Math.pow((box[1][1] - box[0][1]), 2)),
@@ -198,7 +201,7 @@ define([
                     extension,
                     xdir = Math.sin(lineAngle),
                     ydir = Math.cos(lineAngle);
-                    
+
                 for ( i = 1; i < slices && result === null; i++) {
                     // move line perpendicular to angle
                     dir = sideLength / slices * i * (i % 2 === 0 ? -1 : 1);
@@ -223,7 +226,7 @@ define([
             }
 
             /**
-             * With the help of the configured readers (Code128 or EAN) this function tries to detect a 
+             * With the help of the configured readers (Code128 or EAN) this function tries to detect a
              * valid barcode pattern within the given area.
              * @param {Object} box The area to search in
              * @returns {Object} the result {codeResult, line, angle, pattern, threshold}
@@ -251,7 +254,7 @@ define([
                 if(result === null) {
                     result = tryDecodeBruteForce(box, line, lineAngle);
                 }
-                
+
                 if(result === null) {
                     return null;
                 }
@@ -293,4 +296,4 @@ define([
     };
 
     return (BarcodeDecoder);
-}); 
+});

src/camera_access.js

@@ -5,7 +5,7 @@ define(["html_utils"], function(HtmlUtils) {
     "use strict";
     var streamRef,
         loadedDataHandler;
-    
+
     /**
      * Wraps browser-specific getUserMedia
      * @param {Object} constraints
@@ -74,6 +74,8 @@ define(["html_utils"], function(HtmlUtils) {
             videoConstraints = HtmlUtils.mergeObjects({
                 width: 640,
                 height: 480,
+                minAspectRatio: 1,
+                maxAspectRatio: 1,
                 facing: "environment"
             }, config);
 
@@ -89,7 +91,9 @@ define(["html_utils"], function(HtmlUtils) {
                 constraints.video = {
                     mandatory: {
                         minWidth: videoConstraints.width,
-                        minHeight: videoConstraints.height
+                        minHeight: videoConstraints.height,
+                        minAspectRatio: videoConstraints.minAspectRatio,
+                        maxAspectRatio: videoConstraints.maxAspectRatio
                     },
                     optional: [{
                         sourceId: videoSourceId
@@ -132,4 +136,4 @@ define(["html_utils"], function(HtmlUtils) {
             streamRef = null;
         }
     };
-}); 
+});

src/code_39_vin_reader.js

@@ -0,0 +1,59 @@
+/* jshint undef: true, unused: true, browser:true, devel: true */
+/* global define */
+
+define(
+    [
+        "./code_39_reader"
+    ],
+    function(Code39Reader) {
+        "use strict";
+
+        function Code39VINReader() {
+            Code39Reader.call(this);
+        }
+
+        var patterns = {
+            IOQ: /[IOQ]/g,
+            AZ09: /[A-Z0-9]{17}/
+        };
+
+        Code39VINReader.prototype = Object.create(Code39Reader.prototype);
+        Code39VINReader.prototype.constructor = Code39VINReader;
+
+        // Cribbed from:
+        // https://github.com/zxing/zxing/blob/master/core/src/main/java/com/google/zxing/client/result/VINResultParser.java
+        Code39VINReader.prototype._decode = function() {
+            var result = Code39Reader.prototype._decode.apply(this);
+            if (!result) {
+                return null;
+            }
+
+            var code = result.code;
+
+            if (!code) {
+                return;
+            }
+
+            code = code.replace(patterns.IOQ, '');
+
+            if (!code.match(patterns.AZ09)) {
+                console.log('Failed AZ09 pattern code:', code);
+                return null;
+            }
+
+            if (!this._checkChecksum(code)) {
+                return null;
+            }
+
+            result.code = code;
+            return result;
+        };
+
+        Code39VINReader.prototype._checkChecksum = function(code) {
+            // TODO
+            return !!code;
+        };
+
+        return (Code39VINReader);
+    }
+);

src/config.js

@@ -1,5 +1,5 @@
 /**
- * The basic configuration 
+ * The basic configuration
  */
 
 define(function(){
@@ -9,6 +9,8 @@ define(function(){
           constraints: {
               width: 640,
               height: 480,
+              minAspectRatio: 1,
+              maxAspectRatio: 1,
               facing: "environment" // or user
           }
       },
@@ -46,6 +48,6 @@ define(function(){
         }
       }
    };
-   
+
    return config;
-});
+});