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#############################################################
# #
# axis.circular function #
# Author: Claudio Agostinelli #
# E-mail: claudio@unive.it #
# Date: October, 04, 2012 #
# Version: 0.7 #
# #
# Copyright (C) 2012 Claudio Agostinelli #
# and Alessandro Gagliardi #
# #
#############################################################
axis.circular <- function(at=NULL, labels=NULL, units = NULL, template=NULL, modulo=NULL, zero=NULL, rotation=NULL, tick=TRUE, lty, lwd, cex, col, font, tcl=0.025, tcl.text=0.125, digits=2) {
if (missing(cex)) cex <- par("cex.axis")
if (missing(col)) col <- par("col.axis")
if (missing(font)) font <- par("font.axis")
if (missing(lty)) lty <- par("lty")
if (missing(lwd)) lwd <- par("lwd")
if (is.null(at)) {
if (is.null(template) | template=="none" | template=="geographics") {
at <- circular(c(0, pi/2, pi, 3/2*pi),rotation=rotation,zero=zero)
} else if (template=="clock24") {
at <- circular(seq(0, 23), units="hours",rotation=rotation,zero=zero)
units <- "hours"
} else if (template=="clock12") {
at <- circular(seq(0, 11), units="hours",rotation=rotation,zero=zero)
units <- "hours"
}
}
at <- na.omit(at)
atcircularp <- attr(as.circular(at), "circularp")
type <- atcircularp$type
if (is.null(modulo))
modulo <- atcircularp$modulo
if (is.null(units))
units <- atcircularp$units
if (is.null(template))
template <- atcircularp$template
if (template=="geographics" | template=="clock24") {
zero <- pi/2
rotation <- "clock"
} else if (template=="clock12") {
zero <- pi/2
rotation <- "clock"
} else {
if (is.null(zero))
zero <- atcircularp$zero
if (is.null(rotation))
rotation <- atcircularp$rotation
}
atasis <- at
attr(atasis, "circularp") <- attr(atasis, "class") <- NULL
attext <- atasis/pi
if (modulo=="2pi") {
if (units=="radians") {
atasis <- atasis%%(2*pi)
} else if (units=="degrees") {
atasis <- atasis%%(360)
} else if (units=="hours") {
atasis <- atasis%%(24)
}
attext <- attext%%2
} else if (modulo=="pi") {
if (units=="radians") {
atasis <- atasis%%pi
} else if (units=="degrees") {
atasis <- atasis%%180
} else if (units=="hours") {
atasis <- atasis%%12
}
attext <- attext%%1
}
attext <- round(attext, digits=digits)
if (template=="clock12")
at <- 2*at
at <- conversion.circular(at, units="radians", modulo="2pi", zero=0, rotation="counter")
attr(at, "circularp") <- attr(at, "class") <- NULL
## if (rotation=="clock")
## at <- -at
## at <- at+zero
if (is.null(labels)) {
if (length(atasis)==4 && all(atasis==c(0, pi/2, pi, 3/2*pi))) {
if (template=="geographics") {
labels <- c("N", "E", "S", "W")
} else {
if (units=="radians") {
labels <- c("0", expression(frac(pi,2)), expression(pi), expression(frac(3*pi,2)))
} else if (units=="degrees") {
labels <- c("0", "90", "180", "270")
}
}
} else if (length(atasis)==12 && all(atasis==0:11) && template=="clock12") {
labels <- c("0/12", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11")
} else if (length(atasis)==24 && all(atasis==0:23) && template=="clock24") {
labels <- c("0/24", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23")
} else if (units=="radians") {
labels <- as.character(round(atasis, digits=digits))
} else if (units=="degrees") {
labels <- as.character(round(atasis, digits=digits))
} else if (units=="hours") {
labels <- as.character(round(atasis, digits=digits))
}
}
if (!is.null(labels) && length(at)!=length(labels))
stop("'at' and 'labels' must have the same length")
AxisCircularRad(at, units, labels, attext, tick, tcl, tcl.text, cex, col, lty, lwd)
}
AxisCircularRad <- function(at, units, labels, attext, tick, tcl, tcl.text, cex, col, lty, lwd) {
#### at must be in radians, counter, zero=0
r <- 1+tcl*c(-1/2,1/2)
r.l <- 1-tcl.text
z <- cos(at)
y <- sin(at)
for (i in 1:length(at)) {
if (tick) {
lines.default(z[i]*r, y[i]*r, col=col, lty=lty, lwd=lwd)
}
if (is.null(labels)) {
labeltext <- substitute(at*pi, list(at=attext[i]))
} else {
labeltext <- labels[i]
}
text.default(z[i]*r.l, y[i]*r.l, labeltext, cex=cex, col=col)
}
text(0, 0, "+", cex=1)
}
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