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# chartSeries.chob {{{
`chartSeries.chob` <-
function(x)
{
old.par <- par(c('pty','mar','xpd','bg','xaxs','las','col.axis','fg'))
on.exit(par(old.par))
LAYOUT <- ifelse(is.null(x@layout),FALSE,TRUE)
par.list <- list(list(mar=c( 0,3.5,2,3)),
list(mar=c( 0,3.5,0,3)),
list(mar=c(3.5,3.5,0,3)))
# layout page
if(LAYOUT) {
if(!inherits(x@layout,'chart.layout')) {
cl <- chart.layout(x@windows)
} else cl <- x@layout
layout(cl$mat, cl$width, cl$height, respect=FALSE)
}
if(x@windows > 1) {
do.call('par',par.list[[1]])
} else par(mar=c(3.5,3.5,2,3))
x.range <- 1:(x@xrange[2]*x@spacing)
y.range <- seq(x@yrange[1],x@yrange[2],length.out=length(x.range))
log.scale <- ifelse(x@log.scale, 'y', '')
# get current values of series to be charted
xx <- x@xdata
xx <- xx[x@xsubset]
if(is.OHLC(xx)) {
Opens <- as.numeric(Op(xx))
Highs <- as.numeric(Hi(xx))
Lows <- as.numeric(Lo(xx))
Closes <- as.numeric(Cl(xx))
} else {
# if not OHLC, assume univariate series
Lows <- min(xx[,1],na.rm=TRUE)
Highs <- max(xx[,1],na.rm=TRUE)
Closes <- as.numeric(xx[,1])
}
if(x@type=="Heikin-Ashi") {
xCloses <- (Opens+Highs+Lows+Closes)/4
xOpens <- (Opens + lag(Closes)) / 2
xHighs <- max(c(Highs, xOpens, xCloses),na=TRUE)
xLows <- min(c(Lows, xOpens, xCloses),na=TRUE)
Closes <- xCloses
Opens <- xOpens
Highs <- xHighs
Lows <- xLows
x@type <- "candlesticks"
}
par(bg=x@colors$bg.col,col.axis=x@colors$fg.col,
xaxs='r',las=2,fg=x@colors$fg.col)
# create scale of main plot window
plot.new()
plot.window(xlim=c(1,x@xrange[2]*x@spacing),
ylim=c(x@yrange[1],x@yrange[2]),
log=log.scale)
coords <- par('usr')
rect(coords[1],coords[3],coords[2],coords[4],col=x@colors$area)
# check for any underlay TA indicators that need to be drawn here:
main.key <- list() # main.key stores text to be added after all drawing by text()
if (length(x@passed.args$TA) > 0) {
underlay.TA <- which(sapply(x@passed.args$TA,
function(x) {
on <- (-1 %in% x@on)
ifelse(!identical(on, logical(0)), on, F)
}))
for (j in underlay.TA) {
tmp.x <- x@passed.args$TA[[j]]
main.key <- c(main.key,do.call(x@passed.args$TA[[j]]@name, list(tmp.x)))
}
}
# add gridlines _under_ main series
#grid(NA,NULL,col=x@colors$grid.col)
if(x@show.grid) abline(h=axTicks(2), col=x@colors$grid.col)
# a vector of x positions
x.pos <- 1+x@spacing*(1:x@length-1)
if(x@type=='line') {
lines(x.pos,Closes,col=x@colors$up.col,type=x@line.type)
main.key <- c(list(list(legend=
paste('Last',last(Closes)),
text.col=x@colors$up.col)),main.key)
} else {
# create a vector of colors
if(x@multi.col) {
last.Closes <- as.numeric(quantmod::Lag(Closes))
last.Closes[1] <- Closes[1]
# create vector of appropriate bar colors
bar.col <- ifelse(Opens < Closes,
ifelse(Opens < last.Closes,
x@colors$dn.up.col,
x@colors$up.up.col),
ifelse(Opens < last.Closes,
x@colors$dn.dn.col,
x@colors$up.dn.col))
# create vector of appropriate border colors
bar.border <- ifelse(Opens < Closes,
ifelse(Opens < last.Closes,
x@colors$dn.up.border,
x@colors$up.up.border),
ifelse(Opens < last.Closes,
x@colors$dn.dn.border,
x@colors$up.dn.border))
} else {
bar.col <- ifelse(Opens < Closes,x@colors$up.col,x@colors$dn.col)
bar.border <- ifelse(Opens < Closes,x@colors$up.border,x@colors$dn.border)
}
if(x@type %in% c('candlesticks','matchsticks')) {
# draw HL lines
#segments(x.pos,Lows,x.pos,Highs,col=bar.border)
# draw bottom wick
segments(x.pos,Lows,x.pos,apply(cbind(Opens,Closes),1,min),col=bar.border)
# draw top wick
segments(x.pos,Highs,x.pos,apply(cbind(Opens,Closes),1,max),col=bar.border)
# draw OC candles
if(x@type=='candlesticks') {
rect(x.pos-x@spacing/3,Opens,x.pos+x@spacing/3,Closes,
col=bar.col,border=bar.border)
} else segments(x.pos,Opens,x.pos,Closes,col=bar.col)
} else { # draw HLC or OHLC bars
# draw vertical HL
segments(x.pos,Lows,x.pos,Highs,col=bar.col)
# draw CLOSE notch
segments(x.pos,Closes,x.pos+x@spacing/6,Closes,col=bar.col)
# extend CLOSE to left side if HLC, else draw OPEN notch
if(x@bar.type=='hlc') {
segments(x.pos-x@spacing/6,Closes,x.pos,Closes,col=bar.col)
} else segments(x.pos-x@spacing/6,Opens,x.pos,Opens,col=bar.col)
}
main.key <- c(list(list(legend=
paste('Last',last(Closes)),
text.col=last(bar.col))),main.key)
}
axis(4)
box(col=x@colors$fg.col)
old.adj <- par('adj')
par('adj'=0)
do.call('title',list(x@name, col.main=x@colors$fg.col))
par('adj'=1)
do.call('title',list(paste('[',start(xx),'/',end(xx),']', sep='')
,col.main=x@colors$main.col))
par('adj'=old.adj)
# TA calculation and drawing loops
if(x@windows > 1 || length(x@passed.args$TA) > 0) {
for(i in 1:x@windows) {
# draw all overlays needed for figure 'i' on plot
overlay.TA <- which(sapply(x@passed.args$TA,
function(x) {
on <- i %in% x@on
ifelse(!identical(on,logical(0)),on,FALSE)
}))
for(j in overlay.TA) {
# call draws TA and returns the text to add to the chart
overlay.text <- do.call(x@passed.args$TA[[j]]@name,list(x@passed.args$TA[[j]]))
main.key <- c(main.key,overlay.text)
}
if(1) { #i == 1) {
# add indicator key to main chart
if(length(main.key) > 0) {
for(indicator in 1:length(main.key)) {
legend("topleft",
legend=c(rep('',indicator-1), paste(main.key[[indicator]][["legend"]],collapse="")),
text.col=rev(main.key[[indicator]][["text.col"]])[1], bty='n', y.intersp=0.95)
}
}
main.key <- list()
}
if(x@windows >= i+1) {
# if there are more windows to draw...draw the next one
next.new.TA <- which(sapply(x@passed.args$TA,function(x) x@new))[i]
do.call('par',par.list[[2]]) #par(mar=c(0,4,0,3))
if(x@windows == i+1) do.call('par',par.list[[3]]) #par(mar=c(4,4,0,3))
# draw all underlays needed for next figure 'i' on plot
underlay.TA <- which(sapply(x@passed.args$TA,
function(x) {
on <- (-(i+1) %in% x@on)
ifelse(!identical(on,logical(0)),on,FALSE)
}))
if(length(underlay.TA) > 0) {
# if underlays are to be drawn, first set up plot window
#main.key <- list(list("")) # need to position underlay text _under_ original text
do.call("chartSetUp",list(x@passed.args$TA[[next.new.TA]]))
for (j in underlay.TA) {
tmp.x <- x@passed.args$TA[[j]]
underlay.text <- c(main.key,do.call(x@passed.args$TA[[j]]@name, list(tmp.x)))
#main.key <- c(main.key,do.call(x@passed.args$TA[[j]]@name, list(tmp.x)))
}
x@passed.args$TA[[next.new.TA]]@new <- FALSE # make sure plot is not redrawn
main.key <- c(do.call(x@passed.args$TA[[next.new.TA]]@name,list(x@passed.args$TA[[next.new.TA]])),underlay.text)
x@passed.args$TA[[next.new.TA]]@new <- TRUE # make sure plot is redrawn
if(length(main.key) > 0) {
for(indicator in (length(main.key)-length(underlay.text)):length(main.key)) {
legend("topleft",
legend=c(rep('',indicator-1), paste(main.key[[indicator]][["legend"]],collapse="")),
text.col=rev(main.key[[indicator]][["text.col"]])[1], bty='n', y.intersp=0.95)
}
}
} else
main.key <- do.call(x@passed.args$TA[[next.new.TA]]@name,list(x@passed.args$TA[[next.new.TA]]))
}
}
}
# draw the final x labels
if(x@minor.ticks)
axis(1,at=x.pos,labels=FALSE,col=x@colors$minor.tick)
axis(1,at=1+x@bp*x@spacing-x@spacing,labels=x@x.labels,las=1,lwd=1,mgp=c(3,2,0),
col=x@colors$major.tick)
# resave new chob object - just in case of any changes
write.chob(x,dev.cur())
# reset layout of page
if(LAYOUT) layout(matrix(1))
}#}}}
# chart.layout {{{
`chart.layout` <-
function(x) {
if(x==1) {
lyt <- 'layout(matrix(1))'
mat <- matrix(1)
wd <- 1
ht <- 1
} else {
lyt <- paste('layout(matrix(c(1,1:',x,'),',x+1,',1,byrow=TRUE),',
'1,1,respect=FALSE)',sep='')
mat <- matrix(1:x,x,1,byrow=TRUE)
wd <- 1
ht <- c(3,rep(1,x-2),1.60)
}
par.list <- list(list(mar=c( 0,3.5,2,3)),
list(mar=c( 0,3.5,0,3)),
list(mar=c(3.5,3.5,0,3)))
structure(list(text=lyt,mat=mat,width=wd,height=ht,par.list=par.list), class='chart.layout')
}
#}}}
# experimental {{{
#`doCharts` <- function(W, TA, nc) {
# chartLayout(W,TA,nc)
# for(i in 1:x) barChart(GS, subset='2008', layout=NULL)
#}
#
#`chartLayout` <- function(W=1, TA=1, nc=1) {
# x <- matrix(rep(c(1,1,seq(2,length.out=TA)),W) +
# rep(seq(0,by=TA+1, length.out=W), each=TA+2),
# nc=nc, byrow=FALSE)
# layout(x,1,1,respect=FALSE)
#}
#
#`dozenCharts` <- function(W,TA , nc) {
# getSymbols("GS")
# chartLayout(W,TA,nc)
# TAs <- paste('addVo();addMACD();addRSI();addSMI();addROC();addDPO()',
# 'addADX();addATR();addCMF();addCCI();addCMO();addWPR()',sep=';')
# TAs <- unlist(strsplit(TAs,';'))
# Overlays <- paste('addEMA();addBBands();addEnvelope()',
# 'addExpiry();addSAR();addSMA()',sep=';')
# Overlays <- rep(unlist(strsplit(Overlays,';')),2)
#
# for(i in 1:W) {
# TA <- paste(TAs[i],Overlays[i],sep=';')
# candleChart(GS, theme='white', subset='2008', type='b', layout=NULL, TA=TA)
# }
#} #}}}
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