Setting axes limits with googleVis

I posted about the various googleVis axis options for base charts, such as line, bar and area charts earlier, but I somehow forgot to mention how to set the axes limits.

Unfortunately, there are no arguments such as ylim and xlim. Instead, the Google Charts axes options are set via hAxes and vAxes, with h and v indicating the horizontal and vertical axis. More precisely, I have to set viewWindowMode : 'explicit' and set the viewWindow to the desired min and max values. Additionally, I have to wrap all of this in [{}] brackets as those settings are sub-options of h/vAxes. There are also options minValue and maxValue, but they only allow you to extend the axes ranges.

Here is a minimal example, setting the y-axis limits from 0 to 10:

	library(googleVis)
	dat <- data.frame(x=LETTERS[1:10],
	y=c(0, 4, -2, 2, 4, 3, 8, 15, 10, 4))
	area1 <- gvisAreaChart(xvar="x", yvar="y", data=dat,
	options=list(vAxes="[{viewWindowMode:'explicit',
	viewWindow:{min:0, max:10}}]",
	width=500, height=400,
	title="y-limits set from 0 to 10"),
	chartid="area1ylim")
	plot(area1)

view raw area1ylim.R hosted with ❤ by GitHub

With more than one variable to plot I can use the series argument to decide which variables I want on the left and right axes and set the viewWindow accordingly. Again, here is a minimal example:

	set.seed(1234)
	dat <- data.frame(x=LETTERS[1:10], y_1=sample(15,10), y_2=sample(150,10))
	area2 <- gvisAreaChart(xvar="x", yvar=c("y_1", "y_2"), data=dat,
	options=list(
	series="[{targetAxisIndex:0},
	{targetAxisIndex:1}]",
	vAxes="[{viewWindowMode:'explicit',
	viewWindow:{min:0, max:10}},
	{viewWindowMode:'explicit',
	viewWindow:{min:0, max:100}}]",
	title="y-limits set individually",
	width=500, height=400),
	chartid="area2ylim")
	plot(area2)

view raw area2ylim.R hosted with ❤ by GitHub

Session Info

sessionInfo()
R version 3.0.1 (2013-05-16)
Platform: x86_64-apple-darwin10.8.0 (64-bit)

locale:
[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] googleVis_0.4.3

loaded via a namespace (and not attached):
[1] RJSONIO_1.0-3

Posted by Unknown

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