width and height are parameters of geom_tile.

Fixes #1513

Author: hadley

NEWS.md

@@ -1,5 +1,7 @@
 # ggplot2 2.0.0.9000
 
+* `geom_tile()` once again accepts `width` and `height` parameters (#1513).
+
 * Add access to `bw` argument of `density` in `stat_density`, which makes
   it easy to get consistent smoothing between facets for example (@jiho)
 

R/geom-tile.r

@@ -79,6 +79,8 @@ geom_tile <- function(mapping = NULL, data = NULL, stat = "identity",
 #' @export
 #' @include geom-rect.r
 GeomTile <- ggproto("GeomTile", GeomRect,
+  extra_params = c("na.rm", "width", "height"),
+
   setup_data = function(data, params) {
     data$width <- data$width %||% params$width %||% resolution(data$x, FALSE)
     data$height <- data$height %||% params$height %||% resolution(data$y, FALSE)

tests/testthat/test-geom-tile.R

@@ -0,0 +1,13 @@
+context("geom_tile")
+
+test_that("accepts width and height params", {
+  df <- data.frame(x = c("a", "b"), y = c("a", "b"))
+
+  out1 <- layer_data(ggplot(df, aes(x, y)) + geom_tile())
+  expect_equal(out1$xmin, c(0.5, 1.5))
+  expect_equal(out1$xmax, c(1.5, 2.5))
+
+  out2 <- layer_data(ggplot(df, aes(x, y)) + geom_tile(width = 0.5, height = 0.5))
+  expect_equal(out2$xmin, c(0.75, 1.75))
+  expect_equal(out2$xmax, c(1.25, 2.25))
+})