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##
## R source file
## This file is part of rgl
##
##
##
## ===[ SECTION: internal ]===================================================
##
#
# rgl.clamp
#
# clamp value if lower than low or higher than high
#
rgl.clamp <- function(value, low, high) {
if (value < low) {
warning( gettextf("Value clamped to %s",low), domain = NA )
result <- low
}
else if (value > high) {
warning( gettextf("Value clamped to %s",high), domain = NA )
result <- high
}
else {
result <- value
}
return(result)
}
##
## types verification
##
#
# single field bool
#
rgl.bool <- function( x ) {
if (length(x) > 1)
stop( gettextf("'%s' must be a single boolean value", deparse(substitute(x))),
domain = NA)
}
#
# single field numeric
#
rgl.numeric <- function( x ) {
if (length(x) > 1)
stop( gettextf("'%s' must be a single numeric value", deparse(substitute(x))),
domain = NA)
}
#
# single string
#
rgl.string <- function( x ) {
if (length(x) != 1)
stop( gettextf("'%s' must be a single character value",
deparse(substitute(x))), domain = NA)
}
#
# vertex data object
#
rgl.vertex <- function(x, y = NULL, z = NULL) {
xyz <- xyz.coords(x, y, z, recycle=TRUE)
# This is not the same as just rbind(xyz$x,xyz$y,xyz$z)!
# xyz.coords puts all of named vector x into xyz$x
return( matrix( rbind(xyz$x,xyz$y,xyz$z), nrow=3, dimnames=list( c("x","y","z"), NULL ) ) )
}
#
# texture coordinate data object
#
rgl.texcoords <- function(s,t=NULL) {
xy <- xy.coords(s, t, recycle=TRUE)
return( matrix( rbind(xy$x, xy$y), nrow=2, dimnames=list( c("s", "t"), NULL ) ) )
}
#
# obtain number of vertices
#
rgl.nvertex <- function(vertex) {
return( ncol(vertex) )
}
#
# rgl.color - single field color
#
rgl.color <- function( color ) {
if (length(color) > 1)
stop( gettextf("'%s' must be a single color character string", deparse(substitute(color))),
domain = NA)
else
return(col2rgb(color))
}
#
# rgl.mcolor - multiple field colors
#
rgl.mcolor <- function( colors ) {
return( col2rgb(colors) )
}
#
# if vattr > 1, recycle data
#
rgl.attr <- function(vattr, nvertex) {
nvattr <- length(vattr)
if ((nvattr > 1) && (nvattr != nvertex))
vattr <- rep(vattr,length.out=nvertex)
return(vattr)
}
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