使用大小映射和density2d的不寻常的图例-Unusuallegendusingsizemappinganddensity2d

I am trying to make a scatterplot in ggplot2 with a size mapping to a third variable and density2d contours. It seems as if the legend is being confused by the inclusion of density2d contours.

我试图在ggplot2中制作一个散点图，其大小映射到第三个变量和density2d轮廓。似乎传说因包含density2d轮廓而感到困惑。

For example, the following code works:

例如，以下代码有效：

library('ggplot2')
set.seed(1)
x=rnorm(100); y=rnorm(100,sd=10); z=seq(1,10,length.out=100)
dd=data.frame(x=x,y=y,z=z)
ggplot(dd,aes(x,y,size=z))+geom_point()

But now, note the legend behaves unusually when I add in a call to stat_density2d(). In particular, the plot legend shows blue blocks instead of black circles:

但现在，请注意当我添加对stat_density2d（）的调用时，图例的行为异常。特别是，图例显示蓝色块而不是黑色圆圈：

ggplot(dd,aes(x,y,size=z))+geom_point()+stat_density2d()

1 个解决方案

ggplot(dd,aes(x,y,size=z))+geom_point()+stat_density2d(size=0.5)