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// from https://codepen.io/tculda/pen/pogwpOw

/**
 * Given some points with color attached, calculate the color for a new point
 * @param  p The new point position {x: number, y: number}
 * @param  points The array of given colored points [{x: nember, y: number, c: hexColor}]
 * @return hex color string -- The weighted color mix
 */
static Color multiPointGradientPixel(DoublePt p, LPair<DoublePt, Color> gradientPoints) {
  double[] colorRatios = new [l(gradientPoints)];
  fillArray(colorRatios, 1);
  
  for i over gradientPoints:
    for j over gradientPoints:
      if (i != j) {
        double[] d = getProjectionDistance(
          gradientPoints.get(i).a,
          gradientPoints.get(j).a, p);
        colorRatios[i] *= clampZeroToOne(d[1]);
      }
    
  ret blendMultipleColors(countIteratorAsList(l(gradientPoints),
    i -> pair(gradientPoints.get(i).b, colorRatios[i])));
}