Orientation Angles of Line Segments
Computes the orientation angle of each line segment in a line segment pattern.
angles.psp(x, directed=FALSE)
x |
A line segment pattern (object of class |
directed |
Logical flag. See details. |
For each line segment, the angle of inclination to the x-axis (in radians) is computed, and the angles are returned as a numeric vector.
If directed=TRUE, the directed angle of orientation
is computed. The angle respects the
sense of direction from (x0,y0) to (x1,y1).
The values returned are angles in the full range from -π
to π. The angle is computed as
atan2(y1-y0,x1-x0). See atan2.
If directed=FALSE, the undirected angle of orientation
is computed. Angles differing by π are
regarded as equivalent. The values returned are angles
in the range from 0 to π. These angles are
computed by first computing the directed angle,
then adding π to any negative angles.
Numeric vector.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
and Rolf Turner r.turner@auckland.ac.nz
a <- psp(runif(10), runif(10), runif(10), runif(10), window=owin()) b <- angles.psp(a)
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