CCcheck function

Counter Clockwise check

Counter Clockwise check

Check for counter-clockwise orientation for polygons. Positive is counterclockwise.

CCcheck(Z)

Arguments

  • Z: list(x,y)

Details

Uses sign of the area of the polygon to determine polarity.

Returns

  • j: sign of area

Author(s)

Jonathan M. Leesjonathan.lees@unc.edu

Note

Based on the idea calculated area of a polygon.

Examples

Y=list() Y$x=c(170,175,184,191,194,190,177,166,162,164) Y$y=c(-54,-60,-60,-50,-26,8,34,37,10,-15) plot(c(160, 200),c(-85, 85), type='n') points(Y) lines(Y) CCcheck(Y) Z = list(x=rev(Y$x), y=rev(Y$y)) CCcheck(Z)
  • Maintainer: Jonathan M. Lees
  • License: GPL (>= 2)
  • Last published: 2024-07-09

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