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MySQL 5.7 Reference Manual
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Excerpts from this Manual Curve Class

A Curve is a one-dimensional geometry, usually represented by a sequence of points. Particular subclasses of Curve define the type of interpolation between points. Curve is a noninstantiable class.

Curve Properties

  • A Curve has the coordinates of its points.

  • A Curve is defined as a one-dimensional geometry.

  • A Curve is simple if it does not pass through the same point twice, with the exception that a curve can still be simple if the start and end points are the same.

  • A Curve is closed if its start point is equal to its endpoint.

  • The boundary of a closed Curve is empty.

  • The boundary of a nonclosed Curve consists of its two endpoints.

  • A Curve that is simple and closed is a LinearRing.

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