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December 11, 2015 14:30
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Draw choropleth map of Japan using (deprecated) Google Chart API from R
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# This function uses an old API. It is not recommended to use this function. | |
googleChartJapanMap <- function(x, width=500, height=600, col.def="gray", col.min="lightgreen", col.max="darkgreen", col.bg="white", file=NULL, title=NULL){ | |
#2010/12/28 ver.0.1 by kzktmr | |
#2015/12/11 ver.0.2 by kzktmr | |
stopifnot(length(x)==47, width*height<=300000) | |
col2hex <- function(col){ | |
col.rgb <- col2rgb(col) | |
return(substring(rgb(col.rgb[1], col.rgb[2], col.rgb[3], maxColorValue=255), 2)) | |
} | |
xx <- x[!is.na(x)] | |
http <- "http://chart.apis.google.com/chart?cht=map" | |
chld <- paste("JP-", sprintf("%02d", 1:47), sep="")[!is.na(x)] | |
chld <- paste("chld=", paste(chld, collapse="|"), sep="") | |
chco <- paste("chco=", paste(col2hex(col.def), col2hex(col.min), col2hex(col.max), sep=","), sep="") | |
chd <- paste("chd=t:", paste(xx, collapse=","), sep="") | |
chds <- paste("chds=", min(xx), ",", max(xx), sep="") | |
chs <- paste("chs=", width, "x", height, sep="") | |
chf <- paste("chf=bg,s,", col2hex(col.bg), sep="") | |
myurl <- paste(http, chld, chco, chd, chds, chs, chf, sep="&") | |
if(!is.null(title)){ | |
chtt <- paste("chtt=", gsub(" ", "+", title), sep="") | |
myurl <- paste(myurl, chtt, sep="&") | |
} | |
if(is.null(file)){ | |
if(.Platform$OS.type=="windows")writeClipboard(myurl, format=1) | |
if(Sys.info()["sysname"]=="Darwin")write(myurl, pipe("pbcopy")) | |
}else{ | |
download.file(url=myurl, destfile=file, mode = "wb") | |
} | |
} |
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