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#' Plotting routine designed for the CM SAF R Toolbox.
#'
#' This function renders a histogram plot of two variables.
#'
#'@param var1 Name of the first NetCDF variable (character).
#'@param infile1 Filename of the first input NetCDF file. This may include the directory
#' (character).
#'@param var2 Name of the second NetCDF variable (character).
#'@param infile2 Filename of the second input NetCDF file. This may include the directory
#' (character).
#'@param outfile1 Filename of the first output NetCDF file. This may include the directory
#' (character).
#'@param outfile2 Filename of the second output NetCDF file. This may include the directory
#' (character).
#'@param plot.out logical; if TRUE, the plot will be stored in the same folder as outfile1.
#' If FALSE, the plot will not be saved.
#'@param nc34 NetCDF version of output file. If \code{nc34 = 3} the output file will be
#' in NetCDFv3 format (numeric). Default output is NetCDFv4.
#'@param overwrite logical; should existing output file be overwritten?
#'@param verbose logical; if TRUE, progress messages are shown
#'@param toolbox logical; if TRUE, toolbox mode enabled. The two files are adjusted in space
#' and time so that they can be plotted.
#'@param nc1 Alternatively to \code{infile1} you can specify the input as an
#' object of class `ncdf4` (as returned from \code{ncdf4::nc_open}).
#'@param nc2 Alternatively to \code{infile2} you can specify the input as an
#' object of class `ncdf4` (as returned from \code{ncdf4::nc_open}).
#'
#'@return Two NetCDF files are written.
#'@export
#'
#'@family 1d visualization
#'
cmsaf.hist <- function(var1, infile1, var2, infile2, outfile1, outfile2, plot.out = FALSE, nc34 = 4, overwrite = FALSE, verbose = FALSE, toolbox = FALSE, nc1 = NULL, nc2 = NULL) {
gc()
calc_time_start <- Sys.time()
if(overwrite){
if(file.exists(outfile1)){
unlink(outfile1)
}
if(file.exists(outfile2)){
unlink(outfile2)
}
}
cmsafops::cmsaf.adjust.two.files(var1, infile1, var2, infile2, outfile1, outfile2, nc34, overwrite, FALSE, nc1 = nc1, nc2 = nc2)
if(!toolbox) {
id1 <- ncdf4::nc_open(outfile1)
data1 <- try(ncdf4::ncvar_get(id1, var1, collapse_degen = FALSE))
time <- try(ncdf4::ncvar_get(id1, "time"))
t_unit <- ncdf4::ncatt_get(id1, "time", "units")$value
date.time <- as.character(cmsafops::get_time(t_unit, time))
varname <- ncdf4::ncatt_get(id1, var1, "long_name")$value
if (varname == 0)
(varname <- ncdf4::ncatt_get(id1, var1, "standard_name")$value)
if (varname == 0)
(varname <- var1)
unit <- ncdf4::ncatt_get(id1, var1, "units")$value
if (unit == 0)
(unit <- "-")
xlabel <- paste0(varname, " [", unit, "]")
id2 <- ncdf4::nc_open(outfile2)
data2 <- try(ncdf4::ncvar_get(id2, var2, collapse_degen = FALSE))
plot_filepath <- dirname(outfile1)
# pattern <- "[^\\/]+(\\.nc)$" # regular exp. to extract filenames
# regex1 <- regmatches(infile1, regexpr(pattern, infile1))
# regex2 <- regmatches(infile2, regexpr(pattern, infile2))
# Equivalent to above and works for URLs.
regex1 <- get_basename_vis(infile1, nc = nc1)
regex2 <- get_basename_vis(infile2, nc = nc2)
for(i in seq_along(time)) {
if(plot.out) {
plot_filename <- paste0("cmsaf_histogram_plot_", date.time[i], ".png")
if(file.exists(paste0(plot_filepath, "/", plot_filename))){
unlink(paste0(plot_filepath, "/", plot_filename))
}
grDevices::png(paste0(plot_filepath, "/", plot_filename), width = 1024, height = 1024)
}
graphics::hist(data1[,,i], main = varname, xlab = xlabel,
col = grDevices::rgb(91, 127, 149, maxColorValue = 255, alpha = 170))
graphics::hist(data2[,,i], main = "title",
col = grDevices::rgb(230, 50, 50, maxColorValue = 255, alpha = 100), add =TRUE)
leg.txt <- c(regex1, regex2)
textsize <- 1.2
graphics::legend("topright", leg.txt, pch = 15,
col = c(grDevices::rgb(91, 127, 149, maxColorValue = 255, alpha = 170),
grDevices::rgb(230, 50, 50, maxColorValue = 255, alpha = 100)),
cex = textsize)
if(plot.out)
grDevices::dev.off()
}
ncdf4::nc_close(id1)
ncdf4::nc_close(id2)
}
calc_time_end <- Sys.time()
if (verbose) message(cmsafops::get_processing_time_string(calc_time_start, calc_time_end))
}
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