support for panel.vars in ylayer

[Tobias Verbeke]

The example below is a bit artificial, but I can imagine situations where different panel.vars in different layers are useful:

• two data sources where the x and y variables have different names
• a layer where there is no explicit y variable (e.g. a histogram) followed by a layer where specification of a y variable is desirable (e.g. for annotating the histogram).

library(yagpack)
if (interactive()) x11() else pdf()
.yagpenv$backend <- graphics_primitives()

dataFrame <- data.frame(x = c(1, 2, 2, 3),
                        y = c(1, 1, 2, 3),
                        g1 = factor(c("A", "B", "A", "B")),
                        g2 = factor(c("B", "A", "A", "B")))

p <- yplot(data = dataFrame, 
           panel.vars = elist(x = x, y = y, groups = g1),
           panel = ylayer(mapping = map_points(), render = render_lines()) +
                   ylayer(mapping = map_points(), render = render_lines(), 
                       panel.vars = elist(x = x, y = y, groups = g2)))
p                  

[Tobias Verbeke]

• example above now works as expected
• histogram scenario also works
• scenario with different names also works

thanks!