as_colorraster: Map numeric values to a color raster

In RGraphSpace: A Lightweight Interface Between 'igraph' and 'ggplot2' Graphics

Map numeric values to a color raster

Description

Helper function that converts numeric values to colors and returns a raster image. Useful for visualizing numeric matrices as color backgrounds.

Usage

as_colorraster(x, palette = hcl.colors(30), na.color = "white")

Arguments

x	A numeric vector or matrix containing values to be mapped to colors.
palette	A vector of colors used as the palette. By default, hcl.colors(30) is used.
na.color	Color used for NA values. Defaults to NA.

Details

Values in x are rescaled to the range of the palette using scales::rescale(), and each value is mapped to a corresponding color. If x is a matrix, the resulting raster preserves the same dimensions.

Value

A raster object as produced by as.raster().

Examples

library(RGraphSpace)

# Convert the volcano matrix to a color raster
img <- as_colorraster(volcano)
plot(img)

RGraphSpace documentation built on June 13, 2026, 9:06 a.m.