At the end of March Google released a new version of the Chart Tools API with new options for point shapes and line brushes. The arguments are called
lineDashStyle and can be set directly via googleVis.
We published googleVis 0.5.2 on CRAN yesterday with added examples for those new options in
gvisScatterChart. Note, these options can be used with most chart types as well, also in combination. Visit the Google documentation for more details.
R version 3.1.0 (2014-04-10)
Platform: x86_64-apple-darwin13.1.0 (64-bit)
attached base packages:
 stats graphics grDevices utils datasets methods base
other attached packages:
loaded via a namespace (and not attached):
 RJSONIO_1.0-3 tools_3.1.0