Added QR Code support

README.md

@@ -59,7 +59,20 @@
      chart.setAutoScaling();
      chart.setTransparentBackground();
 
-     var imageUrl = chart.getUrl(true); // First param controls http vs. https     
+     var imageUrl = chart.getUrl(true); // First param controls http vs. https
+
+## QR Code
+
+  ![QR Code](https://chart.googleapis.com/chart?cht=qr&chs=100x100&chl=https://github.com/ryanrolds/quiche&chld=L|0)
+
+     var quiche = require('quiche');
+
+     var qr = quiche('qr');
+     qr.setLabel('https://github.com/ryanrolds/quiche');
+     qr.setWidth(100);
+     qr.setHeight(100);
+
+     var url = qr.getUrl(true); // First param controls http vs. https
 
 # Documentation
 
@@ -74,6 +87,7 @@
   * line
   * pie
   * bar
+  * qr
 
 ### All charts
 
@@ -118,6 +132,17 @@
   * line.setSparklines();
   * line.setXY();
 
+### QR Code
+
+  * qr.setLabel(data [string]);
+  * qr.setEncoding(encoding [UTF-8 | Shift_JS | ISO-8859-1]);
+  * qr.setErrorCorrectionLevel(level [string]) // http://code.google.com/apis/chart/infographics/docs/qr_codes.html#overview
+  * qr.setMargin(margin [number]); // Margin around graphic
+  * qr.setWidth(width [number]);
+  * qr.setHeight(height [number]);
+  * qr.getUrl(https [boolean]); // true = https, false = http
+
+
 # Features
 
   * Pie charts

lib/qr.js

@@ -0,0 +1,75 @@
+
+// http://code.google.com/apis/chart/infographics/docs/overview.html
+
+var Chart = require('./chart');
+
+module.exports = (function() {
+  var QR = function() {
+    this.initialize();
+  };
+
+  QR.prototype.initialize = function() {
+    Chart.prototype.initialize.call(this);
+
+    this.type = 'qrcode';
+    this.encoding = 'UTF-8';
+    this.errorCorrection = 'L';
+    this.margins = 0;
+    this.width = 200;
+    this.height = 200;
+  };
+
+  QR.prototype.setLabel = function(data) {
+    this.labels = [data];
+  };
+
+  QR.prototype.getLabel = function() {
+    return this.labels;
+  };
+
+  QR.prototype.setEncoding = function(encoding) {
+    if(['UTF-8', 'Shift_JIS', 'ISO-8859-1'].indexOf(encoding) === -1) {
+      throw new Error('Invalid encoding');
+    }
+
+    this.encoding = encoding;
+  };
+
+  QR.prototype.getEncoding = function() {
+    this.encoding;
+  };
+
+  QR.prototype.setErrorCorrectionLevel = function(level) {
+    if([].indexOf(level) === -1) {
+      throw new Error('Invalid error correction level');
+    }
+
+    this.errorCorrection = level;
+  };
+
+  QR.prototype.getErrorCorrectionLevel = function() {
+    return this.errorCorrection;
+  };
+
+  QR.prototype.setMargin = function(rows) {
+    this.margins = rows;
+  };
+
+  QR.prototype.getMargin = function() {
+    return this.margins;
+  };
+
+  QR.prototype.setWidth = Chart.prototype.setWidth;
+  QR.prototype.setHeight = Chart.prototype.setHeight;
+  QR.prototype.getType = Chart.prototype.getType;
+
+  QR.prototype.getData = function() {
+    return [];
+  }
+
+  QR.prototype.getUrl = function() {
+    return Chart.prototype.getUrl.call(this, arguments[0]);
+  };
+
+  return QR;
+}());

lib/url.js

@@ -14,6 +14,9 @@ module.exports = {
     params = _merge(params, processLegend(chart));
     params = _merge(params, processSize(chart));
     params = _merge(params, processBackground(chart));
+    params = _merge(params, processEncoding(chart));
+    params = _merge(params, processLabel(chart));
+    params = _merge(params, processLabelData(chart));
 
     var options = [];
     for(var param in params) {
@@ -58,6 +61,8 @@ function processType(chart) {
     } else {
       cht += 'c';
     }
+  } else if(type === 'qrcode') {
+    cht = 'qr';
   }
 
   return {
@@ -137,11 +142,13 @@ function processData(chart) {
 }
 
 function processBarWidthSpacing(chart) {
-  var params = {};
-
-  params.chbh = ['a', chart.barSpacing, chart.barWidth].join(','); 
+  if(chart.getType() === 'bar') {
+    return {
+      'chbh': ['a', chart.barSpacing, chart.barWidth].join(',')
+    };
+  }
 
-  return params;
+  return {};
 }
 
 function processAxisLabels(chart) {
@@ -170,13 +177,38 @@ function processAxisLabels(chart) {
 
 function processLegend(chart) {
   var params = {};
-
-  params.chdlp = [chart.legend.position, chart.legend.order].join('|');
-  params.chdls = [chart.legend.color, chart.legend.size].join(',');
+  var legend = chart.legend;
+  if(legend.position || legend.order) {
+
+    params.chdlp = [legend.position || 's', legend.order || 's'].join('|');
+  }
+
+  if(legend.color || legend.size) {
+    if(legend.size && !legend.color) {
+      throw new Error('Legend color must also be set');
+    }
+
+    params.chdls = [legend.color, legend.size].join(',');
+  }
 
   return params;
 }
 
+function processLabelData(chart) {
+  if(chart.getType() === 'qrcode') {
+    var ecl = chart.getErrorCorrectionLevel();
+    var margin = chart.getMargin();
+    if(ecl !== 'L' || margin !== 4) {
+      console.log(ecl, margin, [ecl, margin].join('|'));
+      return {
+        'chld': [ecl, margin].join('|')
+      };
+    }
+  }
+
+  return {};
+}
+
 function processLineStyle(chart) {
   if(['line', 'radar'].indexOf(chart.getType()) === -1) {
     return {};
@@ -217,6 +249,30 @@ function processLineStyle(chart) {
   };
 }
 
+function processLabel(chart) {
+  var type = chart.getType();
+  if(type === 'qrcode') {
+    return {
+      'chl': chart.getLabel()
+    };
+  }
+
+  return {};
+}
+
+function processEncoding(chart) {
+  if(chart.getType() === 'qrcode') {
+    var encoding  = chart.getEncoding();
+    if(encoding && encoding !== 'L') {
+      return {
+        'choe': encoding
+      };
+    }
+  }
+
+  return {};
+}
+
 function processBackground(chart) {
   if(!chart.background) {
     return {};

package.json

@@ -1,11 +1,12 @@
 {
   "name": "quiche",
-  "version": "0.0.5",
+  "version": "0.0.6",
   "author": "Ryan Olds <ryanrolds@gmail.com>",
-  "description": "Google Chart Tools: Image Chart wrapper for Node.js",
+  "description": "Google Chart Tools: Image Chart & Infographics wrapper for Node.js",
   "keywords": [
     "google image charts",
     "charts",
+    "infographics",
     "charting",
     "google charts",
     "url"

quiche.js

@@ -1,6 +1,6 @@
 
 var lookup = {};
-var charts = ['bar', 'pie', 'line'];
+var charts = ['bar', 'pie', 'line', 'qr'];
 charts.forEach(function(item) {
   lookup[item.toLowerCase()] = require('./lib/' + item);
 });

test/pie.test.js

@@ -19,7 +19,4 @@ describe('Pie Chart', function() {
   it('should be a pie chart', function() {
     assert.ok(url.indexOf('cht=p') > 0);
   });
-});
-
-
-
+});

test/qr.test.js

@@ -0,0 +1,22 @@
+var assert = require('assert');
+
+var quiche = require('../quiche');
+
+describe('QR Infograph', function() {
+  var qr = quiche('qr');
+  qr.setLabel('https://github.com/ryanrolds/quiche');
+  qr.setWidth(100);
+  qr.setHeight(100);
+
+  var url = qr.getUrl();
+
+  console.log(url);
+
+  it('should return a url', function() {
+    assert.equal(typeof url, 'string');
+  });
+
+  it('should be a qr', function() {
+    assert.ok(url.indexOf('cht=qr') > 0);
+  });
+});