Gauge

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Last edited Nov 5, 2016

Created on Nov 3, 2016

A click of the button triggers an animated update to a semicircular gauge. The gauge displays four colored arc segments, each representing a random value generated by `d3.randomUniform`, with a black needle pointing to a separate random value. The arcs are rendered using `d3.arc` and `d3.pie` with a start and end angle of -π/2 and π/2. Clicking the button transitions the arcs with a default easing and animates the needle using `transition.attrTween` and `d3.easeElasticOut`, giving it a bouncy motion.

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