Set aspect in image.plot function #8
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Rodrigo, Great idea!
Some points.
A new version of fields (14.0) was just posted yesterday to CRAN. I am bummed I could have added this in. Will do for 14.1.
Also the NCAR/fields repository is frozen. I do active development on the
https://github.com/dnychka/fieldsRPackage
Also the newer version of this function is now called imagePlot and image.plot is frozen.
As to your nice idea. We need to make sure that it works with the option where the grid cells are irregular and the call is not to the basic image function.
Also I am not sure if the legend will be placed in a rational way with the asp option .
Thanks for you comments
Best,
Doug
Douglas Nychka
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Cell 3037253199
From: Rodrigo Lustosa ***@***.***>
Date: Tuesday, July 5, 2022 at 6:38 PM
To: NCAR/fields ***@***.***>
Cc: Subscribed ***@***.***>
Subject: [NCAR/fields] Set aspect in image.plot function (Issue #8)
The graphics::image function, which image.plot depends on, have an asp argument, as well as other R plot functions. You could allow this argument to be passed to graphics::image inside image.plot, so we can prevent geographical plots from being distorted depending on device dimensions. I made this change in the following code and it seems to be working fine (I made a small plot but didn't search too much for bugs). Only two lines were changed.
image.plot <- function (..., add = FALSE, breaks = NULL, nlevel = 64, col = NULL,
horizontal = FALSE, legend.shrink = 0.9, legend.width = 1.2,
legend.mar = ifelse(horizontal, 3.1, 5.1), legend.lab = NULL,
legend.line = 2, graphics.reset = FALSE, bigplot = NULL,
smallplot = NULL, legend.only = FALSE, lab.breaks = NULL,
axis.args = NULL, legend.args = NULL, legend.cex = 1, midpoint = FALSE,
border = NA, lwd = 1, verbose = FALSE, asp = NA)
{
old.par <- par(no.readonly = TRUE)
if (is.null(col)) {
col <- tim.colors(nlevel)
}
else {
nlevel <- length(col)
}
info <- imagePlotInfo(..., breaks = breaks, nlevel = nlevel)
breaks <- info$breaks
if (verbose) {
print(info)
}
if (add) {
big.plot <- old.par$plt
}
if (legend.only) {
graphics.reset <- TRUE
}
if (is.null(legend.mar)) {
legend.mar <- ifelse(horizontal, 3.1, 5.1)
}
temp <- imageplot.setup(add = add, legend.shrink = legend.shrink,
legend.width = legend.width, legend.mar = legend.mar,
horizontal = horizontal, bigplot = bigplot, smallplot = smallplot)
smallplot <- temp$smallplot
bigplot <- temp$bigplot
if (!legend.only) {
if (!add) {
par(plt = bigplot)
}
if (!info$poly.grid) {
image(..., breaks = breaks, add = add, col = col, asp = asp)
}
else {
poly.image(..., add = add, breaks = breaks, col = col,
midpoint = midpoint, border = border, lwd.poly = lwd)
}
big.par <- par(no.readonly = TRUE)
}
if ((smallplot[2] < smallplot[1]) | (smallplot[4] < smallplot[3])) {
par(old.par)
stop("plot region too small to add legend\n")
}
ix <- 1:2
iy <- breaks
nBreaks <- length(breaks)
midpoints <- (breaks[1:(nBreaks - 1)] + breaks[2:nBreaks])/2
iz <- matrix(midpoints, nrow = 1, ncol = length(midpoints))
if (verbose) {
print(breaks)
print(midpoints)
print(ix)
print(iy)
print(iz)
print(col)
}
par(new = TRUE, pty = "m", plt = smallplot, err = -1)
if (!horizontal) {
image(ix, iy, iz, xaxt = "n", yaxt = "n", xlab = "",
ylab = "", col = col, breaks = breaks)
}
else {
image(iy, ix, t(iz), xaxt = "n", yaxt = "n", xlab = "",
ylab = "", col = col, breaks = breaks)
}
if (!is.null(lab.breaks)) {
axis.args <- c(list(side = ifelse(horizontal, 1, 4),
mgp = c(3, 1, 0), las = ifelse(horizontal, 0, 2),
at = breaks, labels = lab.breaks), axis.args)
}
else {
axis.args <- c(list(side = ifelse(horizontal, 1, 4),
mgp = c(3, 1, 0), las = ifelse(horizontal, 0, 2)),
axis.args)
}
do.call("axis", axis.args)
if (!is.null(legend.lab)) {
legend.args <- list(text = legend.lab, side = ifelse(horizontal,
1, 4), line = legend.line, cex = legend.cex)
}
if (!is.null(legend.args)) {
do.call(mtext, legend.args)
}
mfg.save <- par()$mfg
if (graphics.reset | add) {
par(old.par)
par(mfg = mfg.save, new = FALSE)
invisible()
}
else {
par(big.par)
par(plt = big.par$plt, xpd = FALSE)
par(mfg = mfg.save, new = FALSE)
invisible()
}
}
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Hello Douglas, I'm happy you liked! Thank you for your points, I'll be using the imagePlot for now on. If any other suggestion occurs to me, I'll open an Issue in the repository you provided, thanks for sharing it! Indeed the change I made wouldn't work for the irregular grid. I see now that you use I think the legend position won't be a problem as the plot size inside the device don't change with aspect, just the x or y limits (they're no longer fixed). Bellow I let the final changes I made. Thank you for the support! |
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The
graphics::imagefunction, whichimage.plotdepends on, have anaspargument, as well as other R plot functions. You could allow this argument to be passed tographics::imageinsideimage.plot, so we can prevent geographical plots from being distorted depending on device dimensions. I made this change in the following code and it seems to be working fine (I made a small plot but didn't search too much for bugs). Only two lines were changed.The text was updated successfully, but these errors were encountered: