Add horizontal line to the mask of an x3p object

Add horizontal lines to overlay the surface of an x3p object. Lines are added to a mask. In case no mask exists, one is created.

Usage

x3p_add_hline(x3p, yintercept, size = 5, color = "#e6bf98")

Arguments

x3p: x3p object
yintercept: (vector of) numerical values for the position of the lines.
size: width (in pixels) of the line
color: (vector of) character values to describe color of lines

Value

x3p object with added vertical lines in the mask

Examples

if (FALSE) { # \dontrun{
logo <- x3p_read(system.file("csafe-logo.x3p", package = "x3ptools"))
color_logo <- magick::image_read(system.file("csafe-color.png", package = "x3ptools"))
logoplus <- x3p_add_mask(logo, as.raster(color_logo))
# five horizontal lines at equal intervals:
logoplus <- x3p_add_hline(logo, seq(0, 418 * 6.4500e-7, length = 5), size = 3)
x3p_image(logoplus, size = c(741, 419), zoom = 0.5)
} # }