介绍
ggplot2包中对配色系统主要通过以下几个函数实现：
- 数值型
- scale_colour/fill_coninuous()
- scale_fill_distiller(）
- scale_colour/fill_gradient()
- scale_colour/fill_gradient2()
- scale_colour/fill_gradientn()
- 类别型
- scale_colour/fill_discrete()
- scale_colour/fill_brewer()
- scale_colour/fill_manual()
其中，colour表示轮廓色度量，fill表示填充色度量
数值型配色
类别型配色
scale_colour/fill_brewer()
用法
scale_colour_brewer(
...,
type = "seq",
palette = 1,
direction = 1,
aesthetics = "colour"
)
scale_fill_brewer(
...,
type = "seq",
palette = 1,
direction = 1,
aesthetics = "fill"
)
参数介绍：
… Other arguments passed on to discrete_scale(),
continuous_scale(), or binned_scale(), for brewer, distiller, and
fermenter variants respectively, to control name, limits, breaks,
labels and so forth.type One of seq (sequential), div (diverging) or qual (qualitative)
palette If a string, will use that named palette. If a number, will
index into the list of palettes of appropriate type. The list of
available palettes can found in the Palettes section.direction Sets the order of colours in the scale. If 1, the default,
colours are as output by RColorBrewer::brewer.pal(). If -1, the order
of colours is reversed.aesthetics Character string or vector of character strings listing
the name(s) of the aesthetic(s) that this scale works with. This can
be useful, for example, to apply colour settings to the colour and
fill aesthetics at the same time, via aesthetics = c(“colour”,
“fill”).values if colours should not be evenly positioned along the gradient
this vector gives the position (between 0 and 1) for each colour in
the colours vector. See rescale() for a convenience function to map an
arbitrary range to between 0 and 1.space colour space in which to calculate gradient. Must be “Lab” -
other values are deprecated.na.value Colour to use for missing values
guide Type of legend. Use “colourbar” for continuous colour bar, or
“legend” for discrete colour legend.
scale_colour/fill_brewer()是利用已有的颜色集进行配色的，ggplot2中自带的颜色集有:
其他颜色集可以从R包RColorBrewer中获取，利用命令display.brewer.all()可以显示出该包中全部的颜色集：
library(RColorBrewer)
display.brewer.all()
