initial commit

common/utils.js

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+function map(value, sourceBottom, sourceTop, targetBottom, targetTop) {
+  let valueRatio = (value-sourceBottom)/(sourceTop-sourceBottom);
+  return ((targetTop-targetBottom)*valueRatio)+targetBottom;
+}
+
+export function interpolateColors(value, sourceBottom, sourceTop, color1, color2) {
+  let newColor = [
+    map(value, sourceBottom, sourceTop, color1[0], color2[0]),
+    map(value, sourceBottom, sourceTop, color1[1], color2[1]),
+    map(value, sourceBottom, sourceTop, color1[2], color2[2])
+  ];
+  return newColor;
+}
+
+export function addCommas(nStr) {
+    if (nStr < 1000) { return nStr; }
+    nStr += '';
+    let x = nStr.split('.');
+    let x1 = x[0];
+    let x2 = x.length > 1 ? '.' + x[1] : '';
+    let rgx = /(\d+)(\d{3})/;
+    while (rgx.test(x1)) {
+            x1 = x1.replace(rgx, '$1' + ',' + '$2');
+    }
+    return x1 + x2;
+}
+
+// Add zero in front of numbers < 10
+export function zeroPad(i) {
+  if (i < 10) {
+    i = "0" + i;
+  }
+  return i;
+}
+
+/**
+ * Converts an HSL color value to RGB. Conversion formula
+ * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
+ * Assumes h, s, and l are contained in the set [0, 1] and
+ * returns r, g, and b in the set [0, 255].
+ *
+ * @param   {number}  h       The hue
+ * @param   {number}  s       The saturation
+ * @param   {number}  l       The lightness
+ * @return  {Array}           The RGB representation
+ */
+function hslToRgb(h, s, l) {
+  var r, g, b;
+
+  if (s == 0) {
+    r = g = b = l; // achromatic
+  } else {
+    var hue2rgb = function hue2rgb (p, q, t) {
+      if(t < 0) t += 1;
+      if(t > 1) t -= 1;
+      if(t < 1/6) return p + (q - p) * 6 * t;
+      if(t < 1/2) return q;
+      if(t < 2/3) return p + (q - p) * (2/3 - t) * 6;
+      return p;
+    }
+
+    var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
+    var p = 2 * l - q;
+    r = hue2rgb(p, q, h + 1/3);
+    g = hue2rgb(p, q, h);
+    b = hue2rgb(p, q, h - 1/3);
+  }
+
+  return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
+}
+
+function rgbToHex(r, g, b) {
+  return "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);
+}
+
+export function hslToHex(h, s, l) {
+  let rgb = hslToRgb(h, s, l);
+  return rgbToHex(rgb[0],rgb[1],rgb[2]);
+}