add_props: Add visual properties to a visualisation
In rpruim/ggvis2: Interactive grammar of graphics

Add visual properties to a visualisation

1	add_props(vis, ..., .props = NULL, inherit = NULL, env = parent.frame())

`vis`	Visualisation to modify.
`...`	A set of name-value pairs. The name should be a valid vega property. The first two unnamed components are taken to be `x` and `y`. Any additional unnamed components will raise an error.
`.props`	When calling `props` from other functions, you'll often have a list of quoted function functions. You can pass that function to the `.props` argument instead of messing around with substitute. In other words, `.props` lets you opt out of the non-standard evaluation that `props` does.
`inherit`	If `TRUE`, the defaults, will inherit from properties from the parent layer If `FALSE`, it will start from nothing.
`env`	The environment in which to evaluate variable properties.

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mtcars %>% ggvis(~wt, ~mpg) %>% layer_points()
mtcars %>% ggvis() %>% add_props(~wt, ~mpg) %>% layer_points()
mtcars %>% ggvis(~wt) %>% add_props(y = ~mpg) %>% layer_points()