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Javascript svg circular gradiant

I have a problem to solve. I want to draw a circle svg with gradient fonts based on a score. The score varies from 0 to 100. If the score is 60% for example, I have to draw 60% of the circle knowing that the gradient changes every 20%. I would like to do something like the following image but with gradients:

enter image description here

I saw the example below which could be useful to me, but I don't understand how the coordinates of the M in path are calculated:

<svg width="300" height="300">
    <linearGradient id="linearColors1" x1="0" y1="0" x2="1" y2="1">
       <stop offset="0%" stop-color="#01E400"></stop>
       <stop offset="100%" stop-color="#FEFF01"></stop>
    </linearGradient>
    <linearGradient id="linearColors2" x1="0.5" y1="0" x2="0.5" y2="1">
       <stop offset="0%" stop-color="#FEFF01"></stop>
       <stop offset="100%" stop-color="#FF7E00"></stop>
    </linearGradient>
    <linearGradient id="linearColors3" x1="1" y1="0" x2="0" y2="1">
       <stop offset="0%" stop-color="#FF7E00"></stop>
       <stop offset="100%" stop-color="#FB0300"></stop>
    </linearGradient>
    <linearGradient id="linearColors4" x1="1" y1="1" x2="0" y2="0">
       <stop offset="0%" stop-color="#FB0300"></stop>
       <stop offset="100%" stop-color="#9B004A"></stop>
    </linearGradient>
    <linearGradient id="linearColors5" x1="0.5" y1="1" x2="0.5" y2="0">
       <stop offset="0%" stop-color="#9B004A"></stop>
       <stop offset="100%" stop-color="#7D0022"></stop>
    </linearGradient>
    <linearGradient id="linearColors6" x1="0" y1="1" x2="1" y2="0">
       <stop offset="0%" stop-color="#7D0022"></stop>
       <stop offset="100%" stop-color="#01E400"></stop>
    </linearGradient>
    <path d="M150 10 a120 120 0 0 1 103.9230 60"
        fill="none" stroke="url(#linearColors1)" stroke-width="5" />
  <path d="M253.9230 70 a120 120 0 0 1 0 120"
        fill="none" stroke="url(#linearColors2)" stroke-width="5" />
  <path d="M253.9230 190 a120 120 0 0 1 -103.9230 60"
        fill="none" stroke="url(#linearColors3)" stroke-width="5" />
  <path d="M150 250 a120 120 0 0 1 -103.9230 -60"
        fill="none" stroke="url(#linearColors4)" stroke-width="5" />
  <path d="M46.077 190 a120 120 0 0 1 0 -120"
        fill="none" stroke="url(#linearColors5)" stroke-width="5" />
  <path d="M46.077 70 a120 120 0 0 1 103.9230 -60"
        fill="none" stroke="url(#linearColors6)" stroke-width="5" />
</svg>

Can you help me solve this problem or explain to me the calculation logic of the M in the example above?

Thanks very much !

Via Active questions tagged javascript - Stack Overflow https://ift.tt/hUu0LYs
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