-
Notifications
You must be signed in to change notification settings - Fork 2k
/
plot-render.r
202 lines (172 loc) · 7.19 KB
/
plot-render.r
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
#' Build a plot with all the usual bits and pieces.
#'
#' This function builds all grobs necessary for displaying the plot, and
#' stores them in a special data structure called a \code{\link{gtable}}.
#' This object is amenable to programmatic manipulation, should you want
#' to (e.g.) make the legend box 2 cm wide, or combine multiple plots into
#' a single display, preserving aspect ratios across the plots.
#'
#' @seealso \code{\link{print.ggplot}} and \code{link{benchplot}} for
#' for functions that contain the complete set of steps for generating
#' a ggplot2 plot.
#' @return a \code{\link{gtable}} object
#' @keywords internal
#' @param plot plot object
#' @param data plot data generated by \code{\link{ggplot_build}}
#' @export
ggplot_gtable <- function(data) {
plot <- data$plot
panel <- data$panel
data <- data$data
theme <- plot_theme(plot)
build_grob <- function(layer, layer_data) {
if (nrow(layer_data) == 0) return()
dlply(layer_data, "PANEL", function(df) {
panel_i <- match(df$PANEL[1], panel$layout$PANEL)
layer$make_grob(df, scales = panel$ranges[[panel_i]], cs = plot$coord)
}, .drop = FALSE)
}
# helper function return the position of panels in plot_table
find_panel <- function(table) {
summarise(subset(table$layout, grepl("^panel", name)),
t = min(t), r = max(r), b = max(b), l = min(l))
}
# List by layer, list by panel
geom_grobs <- Map(build_grob, plot$layer, data)
plot_table <- facet_render(plot$facet, panel, plot$coordinates,
plot_theme(plot), geom_grobs)
# Axis labels
labels <- coord_labels(plot$coordinates, list(
x = xlabel(panel, plot$labels),
y = ylabel(panel, plot$labels)
))
xlabel <- element_render(theme, "axis.title.x", labels$x)
ylabel <- element_render(theme, "axis.title.y", labels$y)
panel_dim <- find_panel(plot_table)
xlab_height <- grobHeight(xlabel) +
if (is.null(labels$x)) unit(0, "lines") else unit(0.5, "lines")
plot_table <- gtable_add_rows(plot_table, xlab_height)
plot_table <- gtable_add_grob(plot_table, xlabel, name = "xlab",
l = panel_dim$l, r = panel_dim$r, t = -1, clip = "off")
ylab_width <- grobWidth(ylabel) +
if (is.null(labels$y)) unit(0, "lines") else unit(0.5, "lines")
plot_table <- gtable_add_cols(plot_table, ylab_width, pos = 0)
plot_table <- gtable_add_grob(plot_table, ylabel, name = "ylab",
l = 1, b = panel_dim$b, t = panel_dim$t, clip = "off")
# Legends
position <- theme$legend.position
if (length(position) == 2) {
coords <- position
position <- "manual"
}
legend_box <- if (position != "none") {
build_guides(plot$scales, plot$layers, plot$mapping, position, theme, plot$guides, plot$labels)
} else {
zeroGrob()
}
if (is.zero(legend_box)) {
position <- "none"
} else {
# these are a bad hack, since it modifies the contents fo viewpoint directly...
legend_width <- gtable_width(legend_box) + theme$legend.margin
legend_height <- gtable_height(legend_box) + theme$legend.margin
# Set the justification of the legend box
# First value is xjust, second value is yjust
just <- valid.just(theme$legend.justification)
xjust <- just[1]
yjust <- just[2]
if (position == "manual") {
xpos <- theme$legend.position[1]
ypos <- theme$legend.position[2]
# x and y are specified via theme$legend.position (i.e., coords)
legend_box <- editGrob(legend_box,
vp = viewport(x = xpos, y = ypos, just = c(xjust, yjust),
height = legend_height, width = legend_width))
} else {
# x and y are adjusted using justification of legend box (i.e., theme$legend.justification)
legend_box <- editGrob(legend_box,
vp = viewport(x = xjust, y = yjust, just = c(xjust, yjust)))
}
}
panel_dim <- find_panel(plot_table)
# for align-to-device, use this:
# panel_dim <- summarise(plot_table$layout, t = min(t), r = max(r), b = max(b), l = min(l))
if (position == "left") {
plot_table <- gtable_add_cols(plot_table, legend_width, pos = 0)
plot_table <- gtable_add_grob(plot_table, legend_box, clip = "off",
t = panel_dim$t, b = panel_dim$b, l = 1, r = 1, name = "guide-box")
} else if (position == "right") {
plot_table <- gtable_add_cols(plot_table, legend_width, pos = -1)
plot_table <- gtable_add_grob(plot_table, legend_box, clip = "off",
t = panel_dim$t, b = panel_dim$b, l = -1, r = -1, name = "guide-box")
} else if (position == "bottom") {
plot_table <- gtable_add_rows(plot_table, legend_height, pos = -1)
plot_table <- gtable_add_grob(plot_table, legend_box, clip = "off",
t = -1, b = -1, l = panel_dim$l, r = panel_dim$r, name = "guide-box")
} else if (position == "top") {
plot_table <- gtable_add_rows(plot_table, legend_height, pos = 0)
plot_table <- gtable_add_grob(plot_table, legend_box, clip = "off",
t = 1, b = 1, l = panel_dim$l, r = panel_dim$r, name = "guide-box")
} else if (position == "manual") {
# should guide box expand whole region or region withoug margin?
plot_table <- gtable_add_grob(plot_table, legend_box,
t = panel_dim$t, b = panel_dim$b, l = panel_dim$l, r = panel_dim$r,
clip = "off", name = "guide-box")
}
# Title
title <- element_render(theme, "plot.title", plot$labels$title)
title_height <- grobHeight(title) +
if (is.null(plot$labels$title)) unit(0, "lines") else unit(0.5, "lines")
pans <- subset(plot_table$layout, grepl("^panel", name))
plot_table <- gtable_add_rows(plot_table, title_height, pos = 0)
plot_table <- gtable_add_grob(plot_table, title, name = "title",
t = 1, b = 1, l = min(pans$l), r = max(pans$r), clip = "off")
# Margins
plot_table <- gtable_add_rows(plot_table, theme$plot.margin[1], pos = 0)
plot_table <- gtable_add_cols(plot_table, theme$plot.margin[2])
plot_table <- gtable_add_rows(plot_table, theme$plot.margin[3])
plot_table <- gtable_add_cols(plot_table, theme$plot.margin[4], pos = 0)
if (inherits(theme$plot.background, "element")) {
plot_table <- gtable_add_grob(plot_table,
element_render(theme, "plot.background"),
t = 1, l = 1, b = -1, r = -1, name = "background", z = -Inf)
plot_table$layout <- plot_table$layout[c(nrow(plot_table$layout), 1:(nrow(plot_table$layout) - 1)),]
plot_table$grobs <- plot_table$grobs[c(nrow(plot_table$layout), 1:(nrow(plot_table$layout) - 1))]
}
plot_table
}
#' Draw plot on current graphics device.
#'
#' @param x plot to display
#' @param newpage draw new (empty) page first?
#' @param vp viewport to draw plot in
#' @param ... other arguments not used by this method
#' @keywords hplot
#' @export
#' @method print ggplot
print.ggplot <- function(x, newpage = is.null(vp), vp = NULL, ...) {
set_last_plot(x)
if (newpage) grid.newpage()
data <- ggplot_build(x)
gtable <- ggplot_gtable(data)
if (is.null(vp)) {
grid.draw(gtable)
} else {
if (is.character(vp)) seekViewport(vp) else pushViewport(vp)
grid.draw(gtable)
upViewport()
}
invisible(data)
}
#' @rdname print.ggplot
#' @method plot ggplot
#' @export
plot.ggplot <- print.ggplot
#' Generate a ggplot2 plot grob.
#'
#' @param x ggplot2 object
#' @keywords internal
#' @export
ggplotGrob <- function(x) {
ggplot_gtable(ggplot_build(x))
}