我正在尝试创建一个图,将2个单独的图例和多个图的网格组合在一起。我的问题是我发现很难对齐图例,使它们可见且不重叠。希望下面的示例能解释我的意思。
首先,我要创建2个图。在这两个图中,我只关心图例,并且舍弃了实际的图(请忽略这两个图中的实际图)。为了仅获取图例,我使用了cowplot
包。
library(ggplot2)
library(cowplot)
# -------------------------------------------------------------------------
# plot 1 ------------------------------------------------------------------
# create fake data
dfLegend_1 <- data.frame(x = LETTERS[1:10], y = c(1:10))
# set colours
pointColours <- c(A = "#F5736A", B = "#D58D00", C = "#A0A300",
D = "#36B300", E = "#00BC7B", F = "#00BCC2",
G = "#00ADF4", H = "#928DFF", I = "#E568F0",
J = "#808080")
# plot
ggLegend_1 <- ggplot(dfLegend_1, aes(x=x, y=y))+
geom_point(aes(fill = pointColours), shape = 22, size = 10) +
scale_fill_manual(values = unname(pointColours),
label = names(pointColours),
name = 'Variable') +
theme(legend.key.size = unit(0.5, "cm")) +
theme_void()
# get legend
legend_1 <- get_legend(ggLegend_1)
# -------------------------------------------------------------------------
# plot 2 ------------------------------------------------------------------
# Create fake data
dflegend_2 <- data.frame(
x = runif(100),
y = runif(100),
z2 = abs(rnorm(100))
)
# plot
ggLegend_2 <- ggplot(dflegend_2, aes(x=x, y = y))+
geom_point(aes(color = z2), shape = 22, size = 10) +
scale_color_gradientn(
colours = rev(colorRampPalette(c('steelblue', '#f7fcfd', 'orange'))(5)),
limits = c(0,10),
name = 'Gradient',
guide = guide_colorbar(
frame.colour = "black",
ticks.colour = "black"
))
# get legend
legend_2 <- get_legend(ggLegend_2)
然后我创建了许多图表(在这个例子中,我创建了20个单独的图表),并将它们绘制在一个网格上:
# create data
dfGrid <- data.frame(x = rnorm(10), y = rnorm(10))
# make a list of plots
plotList <- list()
for(i in 1:20){
plotList[[i]] <- ggplot(dfGrid) +
geom_ribbon(aes(x = x, ymin = min(y), ymax = 0), fill = "red", alpha = .5) +
geom_ribbon(aes(x = x, ymin = min(0), ymax = max(y)), fill = "blue", alpha = .5) +
theme_void()
}
# plot them on a grid
gridFinal <- cowplot::plot_grid(plotlist = plotList)
最后,我将这两个传奇人物结合在一起,并将它们添加到许多图形的网格中:
# add legends together into on single plot
legendFinal <- plot_grid(legend_2, legend_1, ncol = 1)
# plot everything on the same plot
plot_grid(gridFinal, legendFinal, rel_widths = c(3, 1))
这会导致看起来像这样的结果:
![例图](https://istack.dev59.com/4gn1A.webp)
我还应该注意,在一般情况下,可以有任意数量的变量和网格化图。
cowplot
和patchwork
时重叠。 - Electrino