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  These functions create and draw line segments.
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  These functions create and draw line segments.
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}
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}
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\usage{
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\usage{
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grid.segments(x0 = unit(0, "npc"), y0 = unit(0, "npc"),
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grid.segments(x0 = unit(0, "npc"), y0 = unit(0, "npc"),
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              x1 = unit(1, "npc"), y1 = unit(1, "npc"),
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              x1 = unit(1, "npc"), y1 = unit(1, "npc"),
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              default.units = "npc",
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              default.units = "npc",
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              arrow = NULL,
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              arrow = NULL,
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              name = NULL, gp = gpar(), draw = TRUE, vp = NULL)
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              name = NULL, gp = gpar(), draw = TRUE, vp = NULL)
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segmentsGrob(x0 = unit(0, "npc"), y0 = unit(0, "npc"),
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segmentsGrob(x0 = unit(0, "npc"), y0 = unit(0, "npc"),
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              x1 = unit(1, "npc"), y1 = unit(1, "npc"),
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              x1 = unit(1, "npc"), y1 = unit(1, "npc"),
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              default.units = "npc",
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              default.units = "npc",
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              arrow = NULL, name = NULL, gp = gpar(), vp = NULL)
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              arrow = NULL, name = NULL, gp = gpar(), vp = NULL)
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}
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}
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\arguments{
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\arguments{
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  \item{x0}{ Numeric indicating the starting x-values of the line segments. }
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  \item{x0}{ Numeric indicating the starting x-values of the line segments. }
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  \item{y0}{ Numeric indicating the starting y-values of the line
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  \item{y0}{ Numeric indicating the starting y-values of the line
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}
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}
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\details{
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\details{
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  Both functions create a segments grob (a graphical object describing
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  Both functions create a segments grob (a graphical object describing
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  segments), but only \code{grid.segments}
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  segments), but only \code{grid.segments}
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  draws the segments (and then only if \code{draw} is \code{TRUE}).
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  draws the segments (and then only if \code{draw} is \code{TRUE}).
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}
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}
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\value{
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\value{
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  A segments grob.  \code{grid.segments} returns the value invisibly.
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  A segments grob.  \code{grid.segments} returns the value invisibly.
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}
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}
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\author{Paul Murrell}
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\author{Paul Murrell}