knotR (version 1.0-4)

knotplot: Plotting of knots

Description

Routines to plot projections of knots with a wide range of user-settable options

Usage

knotplot(x, ou, gapwidth=1, n=100, lwd=8, add=FALSE, ...)
knotplot_old(x, ou, gap=20, n=100, lwd=8, add=FALSE, ...)
knotplot2(x, rainbow=FALSE, seg=FALSE, text=FALSE, cross=FALSE, ink=FALSE,
                node=FALSE, width=TRUE, all=FALSE, n=100, circ=1000,
                lwd=8, add=FALSE, ...)

Arguments

x

Description of a knot, coerced to a controlpoints object and a minobj object

rainbow,seg,text,cross,ink,node,all,width,circ

Variables controlling sundry knotplot2() features; see details

ou

An overunder object, useful if overunder information not included in argument x

gap,gapwidth

Variables controlling visual representation of strand crossings; see details

n

Number of points on each Bezier curve

lwd

Width of line to use

add

Boolean, with default FALSE meaning to set up a new plot, and TRUE meaning to just add points and lines to an existing plot

...

Further arguments, passed to plot() and points()

Author

Robin K. S. Hankin

Details

Function knotplot() is useful for production-quality plotting of knots with crossings indicated by the understrand having a gap; function knotplot2() is more useful for development. Function knotplot_old() is included for backward compatibility and is possibly more robust than knotplot().

Function knotplot() works by setting a suitable length of the understrand to NA which results in it not being plotted.

For knotplot():

• overunderobj; A two-column matrix indicating the sense of the crossing. Each row corresponds to a crossing; the first entry is the segment number of the overstrand, and the second is the understrand

• gapwidth; the width of the gap, measured in units of width of the string

For knotplot2():

• rainbow; use rainbow colouring for the segments

• seg; plot the Bezier nodes and handles. The positions of the nodes and handles are obtained from an object of class controlpoints.

• text; include the segment number on the segment

• cross; label the crossings

• ink; label the nodes with their inkscape numbering

• width; show the bending strain energy

The gap argument of knotplot_old() is a the same as the gapwidth argument of knotplot() but gap is measured in the same units as the plot().

Examples

knotplot(k5_1)

knotplot2(k6_1,text=TRUE,seg=TRUE,lwd=1)