quickLength Method
Return an approximate (but easy to compute) arc length. The estimate is:
- Form 8 chords on full circle, proportionally fewer for partials. (But 2 extras if less than half circle.)
- sum the chord lengths
- For a circle, we know this crude approximation has to be increased by a factor (theta/(2 sin (theta/2)))
- Apply that factor.
- Experiments confirm that this is within 3 percent for a variety of eccentricities and arc sweeps.
quickLength(): number
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Last Updated: 08 January, 2020