用多种颜色为轴刻度文本着色 [英] Coloring the axis tick text by multiple colors

问题描述

我正在尝试使用R的plotly程序包绘制heatmap，在此我想为y轴刻度文本的特定标签设置特定的颜色.

I'm trying to plot a heatmap using R's plotly package, where I'd like to have specific colors to specific labels of the y-axis tick text.

这是一个示例数据集:

set.seed(1)
df <- reshape2::melt(matrix(rnorm(100),10,10,dimnames = list(paste0("G",1:10),paste0("S",1:10))))

这是我正在尝试的:

library(plotly)
library(dplyr)
plot_ly(z=c(df$value),x=df$Var2,y=df$Var1,colors=grDevices::colorRamp(c("darkblue","gray","darkred")),type="heatmap",colorbar=list(title="Scaled Value",len=0.4)) %>%
  layout(yaxis=list(title=list(color=c(rep("darkred",5),rep("darkblue",5)))))

由于我收到以下消息，它不起作用:

It's not working since I'm getting:

更改:yaxis=list(title=list(color=c(rep("darkred",5),rep("darkblue",5))))

收件人:yaxis=list(title=list(color=list(c(rep("darkred",5),rep("darkblue",5)))))

或:yaxis=list(title=list(tickcolor=c(rep("darkred",5),rep("darkblue",5))))

或:yaxis=list(title=list(tickcolor=list(c(rep("darkred",5),rep("darkblue",5)))))

似乎没有帮助.

有什么主意吗?

推荐答案

有人在这里为Python询问并回答了一个具有不同设置的类似问题:

A similar question with a different setup has been asked and answered for Python here: Setting a different font color for specific x axis ticks. Below is my best attempt with your setup for R.

情节:

代码:

library(plotly)
library(dplyr)

# data
set.seed(1)
df <- reshape2::melt(matrix(rnorm(100),10,10,dimnames = list(paste0("G",1:10),paste0("S",1:10))))

# plotly setup
p1 <- plot_ly(z=c(df$value),x=df$Var2,y=df$Var1,colors=grDevices::colorRamp(c("darkblue","gray","darkred")),
              type="heatmap",colorbar=list(title="Scaled Value",len=0.4)) 

p2 <- p1 %>% add_trace(xaxis='x2', showscale=FALSE)

p3 <- p2  %>% layout(xaxis=list(range=list(0,9),
                                tickvals=list(0,1,2,3,4),
                                tickfont=list(color='red')),
                     xaxis2=list(range=list(0,9), overlaying='x',
                                 ticktext = list('s9', 's10'),
                                 tickvals=list(5, 6, 7, 8, 9),
                                 tickfont=list(color='blue')))
# plot it
p3

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