smartarrow: Draws a 'smart' arrow between two points.
In sequence: Analysis of Sequences of Events

Description Usage Arguments Details Value Author(s) See Also Examples

Draws a 'smart' arrow between two points surrounded by a circle of known radius. The arrow is arc shaped and ends with an arrowhead.

smartArrow(A = c(0, 2), B = c(2, 2), Ra = 0.2, Rb = 0.1, ClegA = "A", 
ClegB = "B", width = 0.1, col = "lightgreen", ccol = "yellow", 
density = NULL, angle = 0, marge = 1.3, debord = 1.4, plot = FALSE, 
trace = TRUE)

`A`	numeric vector: coordinates of point A.
`B`	numeric vector: coordinatess of point B.
`Ra`	numeric: Radius of circle A
`Rb`	numeric: Radius of circle B
`ClegA`	character: label of circle A
`ClegB`	character: label of circle B
`width`	numeric: width of the arrow
`col`	color to fill the arrow. See`polygon`
`ccol`	color to fill the circle. See `symbols`
`density`	numeric: density of shading lines per inch (default=NULL). See `polygon`
`angle`	numeric: angle of shading lines in radians (default = 0). See `polygon`
`marge`	numeric: Angular distance between each circle and the corresponding end of the arrow (default = 1.3).
`debord`	numeric: overflow of the arrowhead relatively to its body. (Default = 1.4)
`plot`	logical: to draw a first arrow on a new plot.(Default = FALSE)
`trace`	logical: if TRUE (default) the arrow is drawn, else it is simply calculated.

SmartArrow can work both as a high level and a low level function, depending on the value of the argument plot.
Used in flux. Not supposed to be used directly by the user.

An object of class smartarrow having attributes:

`arrow`	The polygon representing the arrow.
`bg`	Color of background
`A`	Coordinates of point A
`B`	Coordinates of point B
`Ra`	Radius of circle A
`Rb`	Radius of circle B
`left`	The most extreme left point of the set circles-arrows.
`right`	The most extreme right point of this set
`up`	The most extreme high point.
`down`	The most extreme low point
`drawcircles`	boolean : draw the circles or not.

Jean-Sebastien Pierre
Jean-sebastien.pierre@univ-rennes1.fr

flux, polygon,symbols
arrows ~ for simple arrows

# For a quick illustration
   smartArrow(plot=TRUE)
# an arrow from a randomly drawn point on [0,2]x[0,2]
   smartArrow(B=runif(2,0,2),Rb=runif(1,0,0.5),ClegB="C")