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05/17/2019 wenyu
domain is the range of the axis. For example, in ggplot2, the x range of mtcar example is (1.32,5.62). But vega-lite cannot find the range so the x-axis starts from 0. That's why I add this property. I think you can find the range from the layout function in ggplot2. You can refer to gg2list() from plotly.
gglist<-gg2list(ggplot2-object)
gglist$layout$xaxis$range
05/18/2019 wenyu
When I use the dataset dataSets/landdata-states.csv. I find vega-lite cannot recognize the field Home.Value. Well, I realized that Vega cannot recognize any name with a dot(.). For now, I don't find a way to let vega recognize a name contains a dot. And we know that R and ggplot2 can use dot in their name. If we cannot find a way to let vega understand dot, maybe we should change the column names of the dataset. For example, I use Home_Value rather than Home.Value to pass the test.
05/20/2019 wenyu
In the example line1.R. ggplot2 has a property linetype. However, I cannot find vega has a similar property. Vega can only define the style of lines in the Mark which means we cannot encode the styles of lines. I will use color to substitute linetype. I'm not sure does vega provide style encoding now. If you have some information, please tell me. Thanks!