plotrix (version 1.2-2)

gradient.rect: gradient.rect

Description

gradient.rect draws a rectangle consisting of nslices subrectangles, each of the color specified by the respective triplet in reds, greens and blues. The rectangle is 'sliced' in the direction specified by gradient.

Usage

gradient.rect(xleft,ybottom,xright,ytop,reds,greens,blues,nslices=50,
  gradient="x")

Arguments

xleft,xright,ybottom,ytop

Positions of the relevant corners of the desired rectangle, as in rect.

reds,greens,blues

vectors of the values of the color components either as 0 to 1 or ,if any value is greater than 1, 0 to 255.

nslices

The number of sub-rectangles that will be drawn.

gradient

whether the gradient should be horizontal (x) or vertical.

Value

• the vector of hexadecimal color values

authors

Jim Lemon

See Also

rgb.to.hex

Examples

# get an empty box
 plot(0:10,type="n",axes=FALSE)
 # first try a "rainbow"
 gradient.rect(1,0,3,6,reds=c(1,0),
  greens=c(seq(0,1,length=10),seq(1,0,length=10)),
  blues=c(0,1),gradient="y")
 # now a "danger gradient"
 gradient.rect(4,0,6,6,c(seq(0,1,length=10),rep(1,10)),
  c(rep(1,10),seq(1,0,length=10)),c(0,0),gradient="y")
 # finally a real mess
 gradient.rect(7,0,9,6,reds=c(1,0),
  greens=rescale(rnorm(20),c(0,1)),blues=c(1,0),
  gradient="y")