RiverDirection: River Direction Arrow
In rivervis: River Visualisation Tool

Description Usage Arguments Author(s) See Also Examples

This plots river flow direction arrow on river charts.

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RiverDirection(riverlayout, loc = NA, arw.length = 0.05, arw.lty = 1,
  arw.lwd = 1, arw.angle = 30, arw.col = "black",
  label = "Flow direction", lbl.cex = 0.5, lbl.pos = 4, lbl.ofs = 0.5)

`riverlayout`	the output list of `RiverLayout` or `RiverMap`.
`loc`	location of arrow. One or two values in the range [0, 1] for left and bottom margin sizes. If `loc = NA`, use mouse to locate the arrow. ESC to confirm.
`arw.length`	arrow length.
`arw.lty`	arrow line style.
`arw.lwd`	arrow line width.
`arw.angle`	arrow head angle.
`arw.col`	arrow colour.
`label`	label of the arrow.
`lbl.cex`	label size.
`lbl.pos`	label position.
`lbl.ofs`	label position offset.

Feng Mao

RiverLayout, RiverDraw, RiverMap, par, locator, arrows.

data(Ballinderry)

riverlayout <- RiverLayout(B.river$River,B.river$Length,
                           B.river$Parent,B.river$Position,
                           B.river$Distance, direction = -1)
RiverDraw(riverlayout)

RiverDirection(riverlayout, arw.length = 0.03,
               loc = c(0.8, 0.05), lbl.cex = 0.8)

# Use mouse to allocate the flow direction sign
## RiverDirection(riverlayout, arw.length = 0.03, lbl.cex = 0.8)