Finite State Stream

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Finite State Stream

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Last edited Dec 19, 2012

Created on Dec 19, 2012

This visualization demonstrates how GeoJSON path rendering can be optimized by maintaining a finite state machine that tracks whether the path context is currently inside a line, polygon, or at its first point. Using the `d3.geoPath` context API, the code selectively issues `moveTo`, `lineTo`, `arc`, and `closePath` calls based on the state bits, avoiding redundant drawing operations. The `pointRadius` parameter controls the size of point markers, while `polygonStart` and `polygonEnd` toggle polygon state to manage closed shapes efficiently. This stateful approach minimizes the number of context switches and drawing commands issued to the underlying rendering engine.

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