### File R/gvisGeoMap.R
### Part of the R package googleVis
### Copyright 2010, 2011, 2012, 2013 Markus Gesmann, Diego de Castillo
### It is made available under the terms of the GNU General Public
### License, version 2, or at your option, any later version,
### incorporated herein by reference.
###
### This program is distributed in the hope that it will be
### useful, but WITHOUT ANY WARRANTY; without even the implied
### warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
### PURPOSE. See the GNU General Public License for more
### details.
###
### You should have received a copy of the GNU General Public
### License along with this program; if not, write to the Free
### Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
### MA 02110-1301, USA
gvisIntensityMap <- function(data, locationvar="", numvar="", options=list(), chartid){
my.type <- "IntensityMap"
dataName <- deparse(substitute(data))
my.options <- list(gvis=modifyList(list(width = 600),options),
dataName=dataName,
data=list(locationvar=locationvar, numvar=numvar,
allowed=c("number", "string")))
checked.data <- gvisCheckIntensityMapData(data, locationvar, numvar)
output <- gvisChart(type=my.type, checked.data=checked.data, options=my.options, chartid=chartid)
return(output)
}
gvisCheckIntensityMapData <- function(data, locationvar, numvar){
if(! is.data.frame(data) ){
stop("Error: data has to be a data.frame.")
}
if(locationvar=="")
locationvar <- 1
data[[locationvar]] <- as.character(data[[locationvar]])
if("" %in% numvar)
numvar <- 2:ncol(data)
data[numvar] <- sapply(data[numvar], as.numeric)
data <- data[c(locationvar, numvar)]
return(data)
}
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