The parameters can be set via a named list. The parameters have to map those
of the Google documentation. 
\itemize{
\item{Boolean arguments are set to 
either \code{TRUE} or \code{FALSE}, using the R syntax.
}
\item{Google API parameters with a single value and with names that don't 
include a "." are set like one would do in R, that is 
\code{options=list(width=200, height=300)}. 
Exceptions to this rule are the width and height options for 
\code{\link{gvisAnnotatedTimeLine}} and \code{\link{gvisAnnotationChart}}.
For those two functions, width and height must be character strings of the 
format \code{"Xpx"}, where \code{X} is a number, or \code{"automatic"}. 
For example, 
\code{options=list(width="200px", height="300px")}.
}
\item{Google API parameters with names that don't include a ".", but require 
multivalues are set as a character, wrapped in "[ ]" and separated by commas, 
e.g. 

\code{options=list(colors="['#cbb69d', '#603913', '#c69c6e']")}
}
\item{Google API parameters with names that do include a "." present parameters with 
several sub-options and have to be set as a character wrapped in "\{ \}".
The values of those sub-options are set via parameter:value. Boolean values
have to be stated as \code{'true'} or \code{'false'}. 
For example the Google documentaion states the formating options for the 
vertical axis and states the parameter as \code{vAxis.format}. 
Then this paramter can be set in R as:

\code{options=list(vAxis="\{format:'#,###\%'\}")}. 
}
\item{If several sub-options have to be set, e.g. 

\code{titleTextStyle.color}, \code{titleTextStyle.fontName} and 
\code{titleTextStyle.fontSize}, then those can be combined in one list item 
such as:

\code{options=list(titleTextStyle="\{color:'red', fontName:'Courier', fontSize:16\}")}
}
\item{paramters that can have more than one value per sub-options are 
wrapped in "[ ]". For example to set the labels for left and right axes use:

\code{options=list(vAxes="[\{title:'val1'\}, \{title:'val2'\}]")}
}
\item{\code{gvis.editor} a character label for an
 on-page button that opens an in-page dialog box enabling
users to edit, change and customise the chart. By default no
value is given and therefore no button is displayed. 
}
}
For more details see the Google API documentation and the R examples below.   
