riverplot: curveseg – R documentation

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curveseg

Draw a curved segment

Description

Draws a curved segment from point (x0,y0) to (x1,y1). The segment is a framgent of a sinusoid, has a defined width and can either have a single color or a color gradient.

Usage

curveseg(
  x0,
  x1,
  y0,
  y1,
  width = 1,
  nsteps = 50,
  col = "#ffcc0066",
  grad = NULL,
  lty = 1,
  form = c("sin", "line"),
  fix.pdf = 0
)

Arguments

`x0`	X coordinate of the starting point
`x1`	X coordinate of the end point
`y0`	X coordinate of the starting point
`y1`	X coordinate of the end point
`width`	Width of the segment to plot
`nsteps`	Number of polygons to use for the segments. The more, the smoother the picture, but at the same time, the more time-consuming to display.
`col`	Color to use. Ignored if grad is not `NULL`.
`grad`	Gradient to use. Can be anything that `colorRampPalette` can understand.
`lty`	Line type for drawing of the segment. Use `lty=0` for no line.
`form`	"sin" for a sinusoidal segment. "line" for a straight segment.
`fix.pdf`	Draw a border around segments with line type lty in a desperate attempt to fix the PDF output.

Value

no value is returned

Examples

# a DNA strand
plot.new()
par( usr= c( 0, 4, -2.5, 2.5 ) )

w    <- 0.4
cols <- c( "blue", "green" )
init <- c( -0.8, -0.5 )
pos  <- c( 1, -1 )
step <- 0.5

for( i in rep( rep( c( 1, 2 ), each= 2 ), 5 ) ) {
  curveseg( init[i], init[i] + step, pos[1], pos[2], width= w, col= cols[i] )
  init[i] <- init[i] + step
  pos <- pos * -1
}

riverplot

Sankey or Ribbon Plots

v0.10

GPL (>= 2.0)

Authors

January Weiner <january.weiner@gmail.com>

Initial release

2021-01-22