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Better sf support #3164

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Merged
merged 3 commits into from
Mar 5, 2019
Merged

Better sf support #3164

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2c18bbb
Change sf_grob to work on sfc struct instead of list of sfg
thomasp85 Feb 11, 2019
981385b
Use st_normalize
thomasp85 Feb 25, 2019
cf80d2f
fix single quotes
thomasp85 Mar 4, 2019
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2 changes: 1 addition & 1 deletion DESCRIPTION
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Original file line number Diff line number Diff line change
Expand Up @@ -52,7 +52,7 @@ Suggests:
rgeos,
rmarkdown,
rpart,
sf (>= 0.3-4),
sf (>= 0.7-3),
svglite (>= 1.2.0.9001),
testthat (>= 0.11.0),
vdiffr (>= 0.3.0)
Expand Down
5 changes: 1 addition & 4 deletions R/coord-sf.R
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Expand Up @@ -365,10 +365,7 @@ sf_rescale01 <- function(x, x_range, y_range) {
return(x)
}

# Shift + affine transformation to rescale to [0, 1] x [0, 1]
# Contributed by @edzer
(x - c(x_range[1], y_range[1])) *
diag(1 / c(diff(x_range), diff(y_range)))
sf::st_normalize(x, c(x_range[1], y_range[1], x_range[2], y_range[2]))
}
sf_rescale01_x <- function(x, range) {
(x - range[1]) / diff(range)
Expand Down
74 changes: 39 additions & 35 deletions R/geom-sf.R
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Expand Up @@ -105,15 +105,7 @@ GeomSf <- ggproto("GeomSf", Geom,

# Need to refactor this to generate one grob per geometry type
coord <- coord$transform(data, panel_params)
grobs <- lapply(1:nrow(data), function(i) {
sf_grob(
coord[i, , drop = FALSE],
lineend = lineend,
linejoin = linejoin,
linemitre = linemitre
)
})
do.call("gList", grobs)
sf_grob(coord, lineend = lineend, linejoin = linejoin, linemitre = linemitre)
},

draw_key = function(data, params, size) {
Expand All @@ -138,33 +130,37 @@ default_aesthetics <- function(type) {
}
}

sf_grob <- function(row, lineend = "butt", linejoin = "round", linemitre = 10) {
sf_grob <- function(x, lineend = "butt", linejoin = "round", linemitre = 10) {
# Need to extract geometry out of corresponding list column
geometry <- row$geometry[[1]]

if (inherits(geometry, c("POINT", "MULTIPOINT"))) {
row <- modify_list(default_aesthetics("point"), row)
gp <- gpar(
col = alpha(row$colour, row$alpha),
fill = alpha(row$fill, row$alpha),
# Stroke is added around the outside of the point
fontsize = row$size * .pt + row$stroke * .stroke / 2,
lwd = row$stroke * .stroke / 2
)
sf::st_as_grob(geometry, gp = gp, pch = row$shape)
} else {
row <- modify_list(default_aesthetics("poly"), row)
gp <- gpar(
col = row$colour,
fill = alpha(row$fill, row$alpha),
lwd = row$size * .pt,
lty = row$linetype,
lineend = lineend,
linejoin = linejoin,
linemitre = linemitre
)
sf::st_as_grob(geometry, gp = gp)
}
geometry <- x$geometry
type <- sf_types[sf::st_geometry_type(geometry)]
is_point <- type %in% "point"
type_ind <- match(type, c("point", "line", "other"))
defaults <- list(
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We will need to re-think this at some point in order to expose to the user in the same way as other geoms. But we don't need to do that in this PR.

GeomPoint$default_aes,
GeomLine$default_aes,
modify_list(GeomPolygon$default_aes, list(fill = "grey90", colour = "grey35"))
)
default_names <- unique(unlist(lapply(defaults, names)))
defaults <- lapply(setNames(default_names, default_names), function(n) {
unlist(lapply(defaults, function(def) def[[n]] %||% NA))
})
alpha <- x$alpha %||% defaults$alpha[type_ind]
col <- x$colour %||% defaults$colour[type_ind]
col[is_point] <- alpha(col[is_point], alpha[is_point])
fill <- x$fill %||% defaults$fill[type_ind]
fill <- alpha(fill, alpha)
size <- x$size %||% defaults$size[type_ind]
stroke <- (x$stroke %||% defaults$stroke[1]) * .stroke / 2
fontsize <- size * .pt + stroke
lwd <- ifelse(is_point, stroke, size * .pt)
pch <- x$shape %||% defaults$shape[type_ind]
lty <- x$linetype %||% defaults$linetype[type_ind]
gp <- gpar(
col = col, fill = fill, fontsize = fontsize, lwd = lwd, lty = lty,
lineend = lineend, linejoin = linejoin, linemitre = linemitre
)
sf::st_as_grob(geometry, pch = pch, gp = gp)
}

#' @export
Expand Down Expand Up @@ -282,3 +278,11 @@ geom_sf_text <- function(mapping = aes(), data = NULL,
layer_class = LayerSf
)
}

sf_types <- c(GEOMETRY = "other", POINT = "point", LINESTRING = "line",
POLYGON = "other", MULTIPOINT = "point", MULTILINESTRING = "line",
MULTIPOLYGON = "other", GEOMETRYCOLLECTION = "other",
CIRCULARSTRING = "line", COMPOUNDCURVE = "other", CURVEPOLYGON = "other",
MULTICURVE = "other", MULTISURFACE = "other", CURVE = "other",
SURFACE = "other", POLYHEDRALSURFACE = "other", TIN = "other",
TRIANGLE = "other")