R version 4.5.0 RC (2025-04-04 r88112 ucrt) -- "How About a Twenty-Six"
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> library("aroma.apd")
Loading required package: affxparser
aroma.apd v0.7.1 successfully loaded. See ?aroma.apd for help.
> 
> # Local functions
> rotate270 <- function(x, ...) {
+   x <- t(x)
+   nc <- ncol(x)
+   if (nc < 2) return(x)
+   x[,nc:1,drop=FALSE]
+ }
> 
> # Scan current directory for APD files
> files <- list.files(pattern="[.](apd|APD)$")
> files <- files[!file.info(files)$isdir]
> if (length(files) > 0) {
+   apdFile <- files[1]
+ 
+   # Read APD intensities in the upper left corner
+   apd <- readApdRectangle(apdFile, xrange=c(0,250), yrange=c(0,250))
+   z <- rotate270(apd$intensities)
+   sub <- paste("Chip type:", apd$header$chipType)
+   image(z, col=gray.colors(256), axes=FALSE, main=apdFile, sub=sub)
+   text(x=0, y=1, labels="(0,0)", adj=c(0,-0.7), cex=0.8, xpd=TRUE)
+   text(x=1, y=0, labels="(250,250)", adj=c(1,1.2), cex=0.8, xpd=TRUE)
+ }
> 
> proc.time()
   user  system elapsed 
   0.15    0.09    0.23