chore: split public and src

public/utils/colorUtils.js

@@ -0,0 +1,49 @@
+"use strict";
+// FMG utils related to colors
+
+// convert RGB color string to HEX without #
+function toHEX(rgb) {
+  if (rgb.charAt(0) === "#") return rgb;
+
+  rgb = rgb.match(/^rgba?[\s+]?\([\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?/i);
+  return rgb && rgb.length === 4
+    ? "#" +
+        ("0" + parseInt(rgb[1], 10).toString(16)).slice(-2) +
+        ("0" + parseInt(rgb[2], 10).toString(16)).slice(-2) +
+        ("0" + parseInt(rgb[3], 10).toString(16)).slice(-2)
+    : "";
+}
+
+const C_12 = [
+  "#dababf",
+  "#fb8072",
+  "#80b1d3",
+  "#fdb462",
+  "#b3de69",
+  "#fccde5",
+  "#c6b9c1",
+  "#bc80bd",
+  "#ccebc5",
+  "#ffed6f",
+  "#8dd3c7",
+  "#eb8de7"
+];
+const scaleRainbow = d3.scaleSequential(d3.interpolateRainbow);
+
+// return array of standard shuffled colors
+function getColors(number) {
+  const colors = d3.shuffle(
+    d3.range(number).map(i => (i < 12 ? C_12[i] : d3.color(scaleRainbow((i - 12) / (number - 12))).hex()))
+  );
+  return colors;
+}
+
+function getRandomColor() {
+  return d3.color(d3.scaleSequential(d3.interpolateRainbow)(Math.random())).hex();
+}
+
+// mix a color with a random color
+function getMixedColor(color, mix = 0.2, bright = 0.3) {
+  const c = color && color[0] === "#" ? color : getRandomColor(); // if provided color is not hex (e.g. harching), generate random one
+  return d3.color(d3.interpolate(c, getRandomColor())(mix)).brighter(bright).hex();
+}