smoothColors {plotrix}

Build a vector of color values

Description

‘⁠smoothColors⁠’ calculates a sequence of colors. If two color names in the arguments are separated by a number, that number of interpolated colors will be inserted between the two color endpoints. Any number of color names and integers may be passed, but the last argument must be a color name. If more than one integer appears between two color names, only the first will be used in the interpolation and the others will be ignored.

Usage

 smoothColors(...,alpha=NA)

Arguments

...

an arbitrary sequence of color names and integers beginning and ending with a color name.

alpha

optional ‘⁠alpha⁠’ (transparency) value.

Value

A vector of hexadecimal color values as used by ‘⁠col⁠’.

Note

For more R functions that transform numeric values into colors or produce colors that can be used to represent values, see the colourschemes package.

Author(s)

Barry Rowlingson

See Also

color.gradient,rgb

Examples

 plot(1:10,main="Test opaque colors",type="n",axes=FALSE)
 box()
 rect(1:7,1:7,3:9,3:9,col=smoothColors("red",2,"green",2,"blue"))