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viewangle.R
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viewangle.R
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viewangle.plot <- function(f = NULL,
long.short = c('l', 's', 'd', 'n'),
direction = c('horizontal', 'vertical', 'diagonal', 'none'),
crop = 1,
sub = TRUE,
...){
long.short <- match.arg(long.short)
long.dir <- unique(match.arg(direction,
several.ok = FALSE))
direction <- substr(long.dir, 1, 1)
ls.string <- c(s = 'short', l = 'long', d = 'diagonal', n = 'none')
dir.v <- direction == 'v' # abbreviate
if (length(f)>1){
f <- unique(sort(f))
}
len.f <- length(f)
d <- c(12, 18, sqrt(12^2 + 18^2))
names(d) <- c('s', 'l', 'd')
dist.rng <- 0:1*(2+dir.v) # in viewing direction
view.rng <- c(-1,1) # perpendicular to viewing direction
for(fi in 1:len.f){
# viewing angle
phi <- atan2(d, f[fi] * crop) # this is half the view angle, i.e., the
# angle between central line and edge of
# field of view
phi.deg <- (phi)*180/pi
## annotation strings for plot
main.str <- paste(long.dir,
ifelse(direction != 'd',
paste0(" (",
ls.string[long.short],
" edge)"),
""))
sub.str <- paste0(f[fi], "mm",
ifelse(crop != 1,
paste0(" (crop: ",
round(crop,1),
")"),
""))
if(long.short == 'n'){
## produce empty plot
plot(1,
type = 'n',
axes = FALSE,
xlab = '',
ylab = '')
} else {
if(fi == 1){
plot(1,
type = 'n',
asp = 1,
pty = 's',
xaxs = 'i',
yaxs = 'i',
axes = FALSE,
xlim = if(dir.v) dist.rng else view.rng,
ylim = if(dir.v) view.rng else dist.rng,
xlab = '',
ylab = ''
)
## graphics::box();
grid()
title(main = main.str,
sub = ifelse(sub, sub.str, ""))
eval(parse(text = paste0("abline(",
ifelse(dir.v, 'h', 'v'),
" = 0, col = 'grey')")))
}
mtext(paste0(round(2*(phi.deg[long.short]),1), "°"),
side = ifelse(dir.v, 4, 3), # right / top
at = 0, # centered on view axis
line = 1 - fi, # assume first outside,
# second inside,
# no third or higher
cex = 0.7,
las = 1 # horizontal
)
slope <- ifelse(dir.v,
d[long.short] / f[fi]/crop,
f[fi] / d[long.short]*crop)
message("𝜑: ", phi[long.short] ,' -> ' ,phi.deg[long.short])
if(!is.na(phi[1])){
abline(0, slope)
abline(0, -slope)
max.h <- 1 # ???
## print(par('usr'))
## show width at 1m distance
p <- tan(phi[long.short])
width <- 2*p
unit <- "m"
if(width < 1){
width <- width*100
unit <- "cm"
}
if(dir.v){
lines(c(1,1), c(-p,p),
col = 'red')
text(1, 0,
paste(round(width, log10(width)<1), unit),
pos = ifelse(len.f == 2 && fi == 1, 2, 4) )
text(0.5, 0,
"1m",
col = 'grey',
## srt = 90,
pos = 3)
} else {
lines(c(-p,p), c(1,1),
col = 'red')
text(0, 1,
paste(round(width, (log10(width)<1)+1), unit),
pos = ifelse(len.f == 2 && fi == 1, 1, 3))
text(0, 0.5,
"1m",
col = 'grey',
srt = 90,
pos = 3)
}
}
if(dir.v){
## cover left of origin (square plot not observed in shiny?)
rect(-20, -2, -0.01, 2,
col = 'white',
border = NA)
}
}
}
}