Added random color option in blockquote tag

3 files changed, 401 insertions, 1 deletions

diff --git a/public/js/index.js b/public/js/index.js
index 5f7e6992..4d617adb 100644
--- a/public/js/index.js
+++ b/public/js/index.js
@@ -118,11 +118,21 @@ var supportBlockquoteTags = [
         },
     },
     {
-        text: '[color tag]',
+        text: '[my color tag]',
         search: '[]',
         command: function () {
             return '[color=' + personalInfo.color + ']';
         }
+    },
+    {
+        text: '[random color tag]',
+        search: '[]',
+        command: function () {
+            var color = randomColor({
+                luminosity: 'light'
+            });
+            return '[color=' + color + ']';
+        }
     }
 ];
 var modeType = {
diff --git a/public/vendor/randomColor.js b/public/vendor/randomColor.js
new file mode 100644
index 00000000..2dfcfa4a
--- /dev/null
+++ b/public/vendor/randomColor.js
@@ -0,0 +1,389 @@
+;(function(root, factory) {
+
+  // Support AMD
+  if (typeof define === 'function' && define.amd) {
+    define([], factory);
+
+  // Support CommonJS
+  } else if (typeof exports === 'object') {
+    var randomColor = factory();
+    
+    // Support NodeJS & Component, which allow module.exports to be a function
+    if (typeof module === 'object' && module && module.exports) {
+      exports = module.exports = randomColor;
+    }
+    
+    // Support CommonJS 1.1.1 spec
+    exports.randomColor = randomColor;
+  
+  // Support vanilla script loading
+  } else {
+    root.randomColor = factory();
+  };
+
+}(this, function() {
+
+  // Seed to get repeatable colors
+  var seed = null;
+
+  // Shared color dictionary
+  var colorDictionary = {};
+
+  // Populate the color dictionary
+  loadColorBounds();
+
+  var randomColor = function(options) {
+    if (options.seed && !seed) seed = options.seed;
+    options = options || {};
+
+    var H,S,B;
+
+    // Check if we need to generate multiple colors
+    if (options.count != null) {
+
+      var totalColors = options.count,
+          colors = [];
+
+      options.count = null;
+
+      while (totalColors > colors.length) {
+        colors.push(randomColor(options));
+      }
+
+      options.count = totalColors;
+
+      //Keep the seed constant between runs. 
+      if (options.seed) seed = options.seed;
+      
+      return colors;
+    }
+
+    // First we pick a hue (H)
+    H = pickHue(options);
+
+    // Then use H to determine saturation (S)
+    S = pickSaturation(H, options);
+
+    // Then use S and H to determine brightness (B).
+    B = pickBrightness(H, S, options);
+
+    // Then we return the HSB color in the desired format
+    return setFormat([H,S,B], options);
+  };
+
+  function pickHue (options) {
+
+    var hueRange = getHueRange(options.hue),
+        hue = randomWithin(hueRange);
+
+    // Instead of storing red as two seperate ranges,
+    // we group them, using negative numbers
+    if (hue < 0) {hue = 360 + hue}
+
+    return hue;
+
+  }
+
+  function pickSaturation (hue, options) {
+
+    if (options.luminosity === 'random') {
+      return randomWithin([0,100]);
+    }
+
+    if (options.hue === 'monochrome') {
+      return 0;
+    }
+
+    var saturationRange = getSaturationRange(hue);
+
+    var sMin = saturationRange[0],
+        sMax = saturationRange[1];
+
+    switch (options.luminosity) {
+
+      case 'bright':
+        sMin = 55;
+        break;
+
+      case 'dark':
+        sMin = sMax - 10;
+        break;
+
+      case 'light':
+        sMax = 55;
+        break;
+   }
+
+    return randomWithin([sMin, sMax]);
+
+  }
+
+  function pickBrightness (H, S, options) {
+
+    var brightness,
+        bMin = getMinimumBrightness(H, S),
+        bMax = 100;
+
+    switch (options.luminosity) {
+
+      case 'dark':
+        bMax = bMin + 20;
+        break;
+
+      case 'light':
+        bMin = (bMax + bMin)/2;
+        break;
+
+      case 'random':
+        bMin = 0;
+        bMax = 100;
+        break;
+    }
+
+    return randomWithin([bMin, bMax]);
+
+  }
+
+  function setFormat (hsv, options) {
+
+    switch (options.format) {
+
+      case 'hsvArray':
+        return hsv;
+
+      case 'hslArray':
+        return HSVtoHSL(hsv);
+
+      case 'hsl':
+        var hsl = HSVtoHSL(hsv);
+        return 'hsl('+hsl[0]+', '+hsl[1]+'%, '+hsl[2]+'%)';
+
+      case 'rgbArray':
+        return HSVtoRGB(hsv);
+
+      case 'rgb':
+        var rgb = HSVtoRGB(hsv);
+        return 'rgb(' + rgb.join(', ') + ')';
+
+      default:
+        return HSVtoHex(hsv);
+    }
+
+  }
+
+  function getMinimumBrightness(H, S) {
+
+    var lowerBounds = getColorInfo(H).lowerBounds;
+
+    for (var i = 0; i < lowerBounds.length - 1; i++) {
+
+      var s1 = lowerBounds[i][0],
+          v1 = lowerBounds[i][1];
+
+      var s2 = lowerBounds[i+1][0],
+          v2 = lowerBounds[i+1][1];
+
+      if (S >= s1 && S <= s2) {
+
+         var m = (v2 - v1)/(s2 - s1),
+             b = v1 - m*s1;
+
+         return m*S + b;
+      }
+
+    }
+
+    return 0;
+  }
+
+  function getHueRange (colorInput) {
+
+    if (typeof parseInt(colorInput) === 'number') {
+
+      var number = parseInt(colorInput);
+
+      if (number < 360 && number > 0) {
+        return [number, number];
+      }
+
+    }
+
+    if (typeof colorInput === 'string') {
+
+      if (colorDictionary[colorInput]) {
+        var color = colorDictionary[colorInput];
+        if (color.hueRange) {return color.hueRange}
+      }
+    }
+
+    return [0,360];
+
+  }
+
+  function getSaturationRange (hue) {
+    return getColorInfo(hue).saturationRange;
+  }
+
+  function getColorInfo (hue) {
+
+    // Maps red colors to make picking hue easier
+    if (hue >= 334 && hue <= 360) {
+      hue-= 360;
+    }
+
+    for (var colorName in colorDictionary) {
+       var color = colorDictionary[colorName];
+       if (color.hueRange &&
+           hue >= color.hueRange[0] &&
+           hue <= color.hueRange[1]) {
+          return colorDictionary[colorName];
+       }
+    } return 'Color not found';
+  }
+
+  function randomWithin (range) {
+    if (seed == null) {
+      return Math.floor(range[0] + Math.random()*(range[1] + 1 - range[0]));
+    } else {
+      //Seeded random algorithm from http://indiegamr.com/generate-repeatable-random-numbers-in-js/
+      var max = range[1] || 1;
+      var min = range[0] || 0;
+      seed = (seed * 9301 + 49297) % 233280;
+      var rnd = seed / 233280.0;
+      return Math.floor(min + rnd * (max - min));
+    }
+  }
+
+  function HSVtoHex (hsv){
+
+    var rgb = HSVtoRGB(hsv);
+
+    function componentToHex(c) {
+        var hex = c.toString(16);
+        return hex.length == 1 ? "0" + hex : hex;
+    }
+
+    var hex = "#" + componentToHex(rgb[0]) + componentToHex(rgb[1]) + componentToHex(rgb[2]);
+
+    return hex;
+
+  }
+
+  function defineColor (name, hueRange, lowerBounds) {
+
+    var sMin = lowerBounds[0][0],
+        sMax = lowerBounds[lowerBounds.length - 1][0],
+
+        bMin = lowerBounds[lowerBounds.length - 1][1],
+        bMax = lowerBounds[0][1];
+
+    colorDictionary[name] = {
+      hueRange: hueRange,
+      lowerBounds: lowerBounds,
+      saturationRange: [sMin, sMax],
+      brightnessRange: [bMin, bMax]
+    };
+
+  }
+
+  function loadColorBounds () {
+
+    defineColor(
+      'monochrome',
+      null,
+      [[0,0],[100,0]]
+    );
+
+    defineColor(
+      'red',
+      [-26,18],
+      [[20,100],[30,92],[40,89],[50,85],[60,78],[70,70],[80,60],[90,55],[100,50]]
+    );
+
+    defineColor(
+      'orange',
+      [19,46],
+      [[20,100],[30,93],[40,88],[50,86],[60,85],[70,70],[100,70]]
+    );
+
+    defineColor(
+      'yellow',
+      [47,62],
+      [[25,100],[40,94],[50,89],[60,86],[70,84],[80,82],[90,80],[100,75]]
+    );
+
+    defineColor(
+      'green',
+      [63,178],
+      [[30,100],[40,90],[50,85],[60,81],[70,74],[80,64],[90,50],[100,40]]
+    );
+
+    defineColor(
+      'blue',
+      [179, 257],
+      [[20,100],[30,86],[40,80],[50,74],[60,60],[70,52],[80,44],[90,39],[100,35]]
+    );
+
+    defineColor(
+      'purple',
+      [258, 282],
+      [[20,100],[30,87],[40,79],[50,70],[60,65],[70,59],[80,52],[90,45],[100,42]]
+    );
+
+    defineColor(
+      'pink',
+      [283, 334],
+      [[20,100],[30,90],[40,86],[60,84],[80,80],[90,75],[100,73]]
+    );
+
+  }
+
+  function HSVtoRGB (hsv) {
+
+    // this doesn't work for the values of 0 and 360
+    // here's the hacky fix
+    var h = hsv[0];
+    if (h === 0) {h = 1}
+    if (h === 360) {h = 359}
+
+    // Rebase the h,s,v values
+    h = h/360;
+    var s = hsv[1]/100,
+        v = hsv[2]/100;
+
+    var h_i = Math.floor(h*6),
+      f = h * 6 - h_i,
+      p = v * (1 - s),
+      q = v * (1 - f*s),
+      t = v * (1 - (1 - f)*s),
+      r = 256,
+      g = 256,
+      b = 256;
+
+    switch(h_i) {
+      case 0: r = v, g = t, b = p;  break;
+      case 1: r = q, g = v, b = p;  break;
+      case 2: r = p, g = v, b = t;  break;
+      case 3: r = p, g = q, b = v;  break;
+      case 4: r = t, g = p, b = v;  break;
+      case 5: r = v, g = p, b = q;  break;
+    }
+    var result = [Math.floor(r*255), Math.floor(g*255), Math.floor(b*255)];
+    return result;
+  }
+
+  function HSVtoHSL (hsv) {
+    var h = hsv[0],
+      s = hsv[1]/100,
+      v = hsv[2]/100,
+      k = (2-s)*v;
+
+    return [
+      h,
+      Math.round(s*v / (k<1 ? k : 2-k) * 10000) / 100,
+      k/2 * 100
+    ];
+  }
+
+  return randomColor;
+}));
diff --git a/public/views/foot.ejs b/public/views/foot.ejs
index 0e808e6a..e950cf51 100644
--- a/public/views/foot.ejs
+++ b/public/views/foot.ejs
@@ -34,6 +34,7 @@
 <script src="/vendor/md5.min.js" defer></script>
 <script src="/vendor/md-toc.js" defer></script>
 <script src="/vendor/showup/showup.js" defer></script>
+<script src="/vendor/randomColor.js" defer></script>
 <script type="text/javascript" src="https://www.dropbox.com/static/api/2/dropins.js" id="dropboxjs" data-app-key="rdoizrlnkuha23r" async defer></script>
 <script type="text/x-mathjax-config">
     MathJax.Hub.Config({ messageStyle: "none", skipStartupTypeset: true ,tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']], processEscapes: true }});