The opacityscale, 'extremes', has constant opacity equal to 1

The function createWave()

Line 19 in d37895b

function createWave(n, minOpacity) {

generates an opacityscale with all opacities equal to 1, because:

 Math.max(1, Math.min(0, v)) // line 27

is 1 for any v.

Replacing it by:

 Math.min(1, Math.max(0, v))

removes the actual drawback, and leads to a non-constant opacityscale.

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