debug alluvia form neg obs + version patch

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: ggalluvial
 Type: Package
 Title: Alluvial Plots in 'ggplot2'
-Version: 0.11.0.0001
+Version: 0.11.1
 Date: 2019-11-25
 Authors@R: person('Jason Cory', 'Brunson', email = '[email protected]',
     role = c('aut', 'cre'))

NEWS.md

@@ -1,6 +1,10 @@
 
 # next version (v1.0.0?)
 
+# ggalluvial 0.11.1
+
+This patch fixes a bug with including negative observations in alluvia-form data due to outdated code that prohibited negative `y` values. This was discovered while drafting two examples of this usage, which are included in the documentation.
+
 # ggalluvial 0.11.0
 
 ## Parameter renamings, deprecations, and additions

inst/examples/ex-stat-flow.r

@@ -45,6 +45,17 @@ ggplot(vaccinations,
   stat_stratum(alpha = .5) +
   geom_flow(max.y = 100) +
   geom_text(stat = "stratum")
+# negate missing entries
+ggplot(transform(vaccinations, count = freq * (-1) ^ (response == "Missing")),
+       aes(y = count,
+           x = survey, stratum = response, alluvium = subject,
+           fill = response, label = response,
+           alpha = response != "Missing")) +
+  stat_stratum() +
+  geom_flow() +
+  geom_text(stat = "stratum", alpha = 1) +
+  scale_alpha_discrete(range = c(.2, .6)) +
+  guides(alpha = FALSE)
 
 # aesthetics that vary betwween and within strata
 data(vaccinations)