两个不同gtable的相同宽度

Question

（我想要一个带有一些数据、标题和脚注的 gtable 对象。 这三个元素中的每一个都是 gtables，它们首先使用 gtable_add_rows 组合成一个 gtable-object，然后使用 gtable_add_grob 将三个 gtables 排列成一个 grob。不幸的是，标题/脚注太长（分别太短）

如何设置标题/脚线的宽度？

如何将标题/脚注的文本分配给左对齐？

我的代码示例：

require(gtable)
require(grid)
require(gridExtra)

tbl<-matrix(paste(letters[1:6]),nrow=2)
colnames(tbl)<-c(paste0("col",1:3))
rownames(tbl)<-c(paste0("row",1:2))
tbl

tt1 <- ttheme_default(base_size = 10,rowhead=list(fg_params=list(fontface=2,hjust=0, x=0)))
tt2 <- ttheme_default(base_size = 15,fg_params=list(fontface="bold",hjust=1,x=0.9))
tt3 <- ttheme_default(base_size =7, fg_paras=list(fontface="italic",hjust=0,x=0.9))

gtbl <- tableGrob(tbl, theme=tt1)
htxt <- tableGrob("Headline is too long and this is stupid", theme=tt2)
ftxt <- tableGrob("Footnote", theme=tt3)

padding <- unit(1,"line")
table <- gtable_add_rows(gtbl,
                     heights = grobHeight(htxt) + padding,
                     pos = 0)

table <- gtable_add_rows(table, 
                     heights = grobHeight(ftxt)+ padding)
table <- gtable_add_grob(table, list(htxt, ftxt),
                     t=c(1, nrow(table)), l=c(1,1), 
                     r=ncol(table))
dim(table)
grid.newpage()
grid.draw(table)      

感谢您的帮助！

沃尔克

Answer 1

我解决了我的问题。 只剩下两个小问题。请参阅下面我的注释代码。

# load packages ------------------------------------------------------------

require(gtable)
require(grid)
require(gridExtra)


# id makro ----------------------------------------------------------------
# see here: https://stackoverflow.com/questions/43613320/how-to-add-multi-sub-columns-in-gridextratablegrob/43620247#43620247
# Tanks to: baptiste
id_cell <- function(table, row, col, name="colhead-fg"){
  l <- table$layout
  which(l$t %in% row & l$l %in% col & l$name==name)
}

# code to test it----------------------------------------------------------------


# Some different table themes
tt1 <- ttheme_default(base_size = 10,rowhead=list(fg_params=list(fontface=2,hjust=0, x=0))) # Data
tt2 <- ttheme_default(base_size = 15,fg_params=list(fontface="bold",hjust=1,x=0.9)) # Header
tt3 <- ttheme_default(base_size = 7,fg_params=list(fontface="italic",hjust=0,x=0.9)) # Footnote

# Convert to gtable
# 1. Data
# The data 
tbl<-matrix(paste(letters[1:6]),nrow=2)
colnames(tbl)<-c("col1","column2","verywidecolum3")
rownames(tbl)<-c(paste0("row",1:2))
gtbl <- tableGrob(tbl, theme=tt1)

# 2. Headline
# Note: Define the Headline as gtable with as many columns a your Data
# Headline is defined in last colum due to the Makro id_cells. 
hl<-"Headline"
hlm<-matrix(c(rep("",(dim(gtbl)[2]-1)),hl),nrow=1)
hlm
htxt <- tableGrob(hlm, theme=tt2)

# 3. Footnote
# Note: Define the Footnote as gtable with as many columns a your Data
# The text of your footnote is defined in last colum due to the Makro id_cells. 
ftm<-matrix(c(rep("",(dim(gtbl)[2]-1)),"Footnote"),nrow=1)
ftxt <- tableGrob(ftm, theme=tt3)

# Define your table with Headline, Data and Footnote in one gtable object
tab2<-combine(htxt,gtbl,ftxt,along=2)

# Draw Grid - not formated
grid.newpage()
grid.draw(tab2)     

# Formating of  Grid Table

# Adjust columnwidths: same widths for each column
tab2$widths <- unit(rep(1/ncol(tab2), ncol(tab2)), "null")

# 
rowg<-dim(tab2)[1] # Number of rows of your gtable
colg<-dim(tab2)[2] # Number of columns of your gtable
eleg<-2*rowg*colg # Number of grobs of your gtable
# Note: Grobs in gtables are arranged in rows. Within each row first grob class "text" is repeated for the columns of gtable, then grob class "rect"


# Identify Grob elements which should be formated
# This is Headline and footnote, 
forg<-c(1:colg,(eleg-2*colg+1):(eleg-colg));forg
for (i in forg){
  if ((class(tab2$grobs[[i]])=="text")[1] == TRUE) {
    print(i)
    tab2$grobs[[i]]$x<-unit(0,"npc")
    tab2$grobs[[i]]$hjust<-0
  }
}

# Headline over all cells
idh <- id_cell(tab2, 1, colg,"core-fg")
tab2$layout[idh,"l"] <- tab2$layout[idh,"l"] - (colg-1)

# Footnote over all cells
idf <- id_cell(tab2, rowg, colg,"core-fg")
tab2$layout[idf,"l"] <- tab2$layout[idf,"l"] - (colg-1)

# Draw grid
grid.newpage()
grid.draw(tab2)     

我的两个小问题：

a) 这段代码

tab2$widths <- unit(rep(1/ncol(tab2), ncol(tab2)), "null")

为每列设置相同的宽度。但它似乎不是所需的最小列宽。在我的示例中，它是最后一列所需的最小宽度。如何将列与所需的最小列宽匹配，以使每列具有相同的宽度？

b) 如何更改 babtistes 函数 id_cell，

# id makro ----------------------------------------------------------------
# see here: https://stackoverflow.com/questions/43613320/how-to-add-multi-sub-columns-in-gridextratablegrob/43620247#43620247
# Tanks to: baptiste
id_cell <- function(table, row, col, name="colhead-fg"){
  l <- table$layout
  which(l$t %in% row & l$l %in% col & l$name==name)
}

是否可以先指定页眉/脚注，然后指定必要的空单元格？ 这与此代码部分有关：

# 2. Headline
# Note: Define the Headline as gtable with as many columns a your Data
# Headline is defined in last colum due to the Makro id_cells. 
hl<-"Headline"
hlm<-matrix(c(rep("",(dim(gtbl)[2]-1)),hl),nrow=1)
htxt <- tableGrob(hlm, theme=tt2)

和

# Headline over all cells
idh <- id_cell(tab2, 1, colg,"core-fg")
tab2$layout[idh,"l"] <- tab2$layout[idh,"l"] - (colg-1)