R 将绘图标题添加到ggvis_R_Title_Ggvis

R 将绘图标题添加到ggvis

R 将绘图标题添加到ggvis,r,title,ggvis,R,Title,Ggvis,我想给ggvis情节添加一个标题。我到处找不到一个例子。使用其他R图很简单，例如 library(ggplot2) library(ggvis) x <- 1:10 y <- x^2 df <- data.frame(x, y) plot(x, y, main = "Plot Title") # Base R with title ggplot(df, aes(x, y)) + geom_point() + ggtitle("Plot Title") # ggplot2

我想给ggvis情节添加一个标题。我到处找不到一个例子。使用其他R图很简单，例如

library(ggplot2)
library(ggvis)
x <- 1:10
y <- x^2
df <- data.frame(x, y)

plot(x, y, main = "Plot Title")  # Base R with title
ggplot(df, aes(x, y)) + geom_point() + ggtitle("Plot Title")  # ggplot2 with title
df %>% ggvis(~x, ~y) %>% layer_points()  # ggvis but no title??

库（ggplot2）
图书馆（ggvis）
x嗯，似乎还没有实施（或记录在案？）。我很确定这会很快被添加。现在，您可以使用如下脏黑客：
df %>% ggvis(~x, ~y) %>% layer_points() %>% 
  add_axis("x", title = "X units") %>%
  add_axis("x", orient = "top", ticks = 0, title = "Plot Title",
           properties = axis_props(
             axis = list(stroke = "white"),
             labels = list(fontSize = 0)))

此外，如果您想多次使用此黑客，您可以为其创建一个速记
add_title <- function(vis, ..., x_lab = "X units", title = "Plot Title") 
{
  add_axis(vis, "x", title = x_lab) %>% 
    add_axis("x", orient = "top", ticks = 0, title = title,
             properties = axis_props(
               axis = list(stroke = "white"),
               labels = list(fontSize = 0)
             ), ...)
}
df %>% ggvis(~x, ~y) %>% layer_points() %>% add_title() #same as before
df %>% ggvis(~x, ~y) %>% layer_points() %>% add_title(title = "Hello", x_lab = "ton")

添加标题%
添加_轴（“x”，orient=“top”，记号=0，标题=title，
属性=轴/支柱(
轴=列表（笔划=“白色”），
标签=列表（fontSize=0）
), ...)
}
df%%>%ggvis（~x，~y）%%>%layer_points（）%%>%add_title（）#与之前相同
df%%>%ggvis（~x，~y）%%>%layer\u points（）%%>%add\u title（title=“Hello”，x\u lab=“ton”）

编辑：
现在，您可以同时设置主标题和x轴标签，修复下面提到的重叠。
此外，要更改标题的字体大小，请使用以下代码（改编自@tonytonov的答案）：
添加标题%
添加_轴（“x”，orient=“top”，记号=0，标题=title，
属性=轴/支柱(
轴=列表（笔划=“白色”），
标题=列表（字体大小=32），
标签=列表（fontSize=0）
), ...)
}
我更新了@tonytonov的答案，使其不干扰默认的X轴。它仍然实现为轴，但实现了自己的“标题”比例，并将用户提供的标题属性（如fontsize和color）与使轴不可见所需的默认属性正确合并。此版本在不假定特定背景颜色的情况下隐藏轴。
函数后面有三个示例
library(ggvis)

# ggvis lacks a plot title function, so add one.
# based on clever hack by tonytonov
# http://stackoverflow.com/a/25030002/1135316
add_title <- function(vis, ..., properties=NULL, title = "Plot Title") 
{
    # recursively merge lists by name
    # http://stackoverflow.com/a/13811666/1135316
    merge.lists <- function(a, b) {
        a.names <- names(a)
        b.names <- names(b)
        m.names <- sort(unique(c(a.names, b.names)))
        sapply(m.names, function(i) {
                   if (is.list(a[[i]]) & is.list(b[[i]])) merge.lists(a[[i]], b[[i]])
                   else if (i %in% b.names) b[[i]]
                   else a[[i]]
               }, simplify = FALSE)
    }

    # default properties make title 'axis' invisible
    default.props <- axis_props(
        ticks = list(strokeWidth=0),
        axis = list(strokeWidth=0),
        labels = list(fontSize = 0),
        grid = list(strokeWidth=0)
        )
    # merge the default properties with user-supplied props.
    axis.props <- do.call(axis_props, merge.lists(default.props, properties))

    # don't step on existing scales.
    vis <- scale_numeric(vis, "title", domain = c(0,1), range = 'width')
    axis <- ggvis:::create_axis('x', 'title', orient = "top",  title = title, properties = axis.props, ...)
    ggvis:::append_ggvis(vis, "axes", axis)
}

# add title with default X axis.
iris %>% 
  ggvis(x = ~Petal.Width) %>% 
  layer_points(y = ~Petal.Length, fill = ~Species) %>%
  add_title(title = "Petal.Width vs. Petal.Length")

# Add title with overridden X axis
iris %>% 
  ggvis(x = ~Petal.Width) %>% 
  layer_points(y = ~Petal.Length, fill = ~Species) %>%
  add_axis("x", title = "X-axis!!!!", title_offset=40,
           properties = axis_props(title=list(fontSize=16),
               labels = list(fontSize = 12))) %>%
  add_title(title = "Petal.Width vs. Petal.Length")

# Change the font size of the title.
iris %>% 
  ggvis(x = ~Petal.Width) %>% 
  layer_points(y = ~Petal.Length, fill = ~Species) %>%
  add_title(title = "Petal.Width vs. Petal.Length",
            properties = axis_props(title=list(fontSize=20)))

库（ggvis）
#ggvis缺少plot title函数，所以添加一个。
#基于tonytonov的聪明黑客
# http://stackoverflow.com/a/25030002/1135316
添加标题谢谢Tony。有时黑客可能会比他们的价值更麻烦，但这是整洁！不客气！当一个更优雅的本机解决方案出现时，我会尽量记住更新这篇文章。不幸的是，这种黑客行为与在实际的x轴上设置标签不兼容。下图显示，使用add_title（）时，x轴标签与原始标签“wt”重叠。看起来像是ggvis里的一只虫子mtcars%%>%ggvis（~wt，~mpg）%%>%layer_points（）%%>%add_axis（“x”，title=“long axis label”）%%>%add_title（title=“Any title”）
@ChrisWarth尝试一下我建议的修复方法，似乎可以完成这项工作。@dsh尽管您建议的编辑被审阅者拒绝，但实际上还是很有帮助的。我更新了答案并确保它能工作，尽管我省略了类型=
规范，因为它是多余的（由？add_axis中的第一个示例支持）。不管怎样，我只是想感谢你的努力和有意义的编辑解释。
library(ggvis)

# ggvis lacks a plot title function, so add one.
# based on clever hack by tonytonov
# http://stackoverflow.com/a/25030002/1135316
add_title <- function(vis, ..., properties=NULL, title = "Plot Title") 
{
    # recursively merge lists by name
    # http://stackoverflow.com/a/13811666/1135316
    merge.lists <- function(a, b) {
        a.names <- names(a)
        b.names <- names(b)
        m.names <- sort(unique(c(a.names, b.names)))
        sapply(m.names, function(i) {
                   if (is.list(a[[i]]) & is.list(b[[i]])) merge.lists(a[[i]], b[[i]])
                   else if (i %in% b.names) b[[i]]
                   else a[[i]]
               }, simplify = FALSE)
    }

    # default properties make title 'axis' invisible
    default.props <- axis_props(
        ticks = list(strokeWidth=0),
        axis = list(strokeWidth=0),
        labels = list(fontSize = 0),
        grid = list(strokeWidth=0)
        )
    # merge the default properties with user-supplied props.
    axis.props <- do.call(axis_props, merge.lists(default.props, properties))

    # don't step on existing scales.
    vis <- scale_numeric(vis, "title", domain = c(0,1), range = 'width')
    axis <- ggvis:::create_axis('x', 'title', orient = "top",  title = title, properties = axis.props, ...)
    ggvis:::append_ggvis(vis, "axes", axis)
}

# add title with default X axis.
iris %>% 
  ggvis(x = ~Petal.Width) %>% 
  layer_points(y = ~Petal.Length, fill = ~Species) %>%
  add_title(title = "Petal.Width vs. Petal.Length")

# Add title with overridden X axis
iris %>% 
  ggvis(x = ~Petal.Width) %>% 
  layer_points(y = ~Petal.Length, fill = ~Species) %>%
  add_axis("x", title = "X-axis!!!!", title_offset=40,
           properties = axis_props(title=list(fontSize=16),
               labels = list(fontSize = 12))) %>%
  add_title(title = "Petal.Width vs. Petal.Length")

# Change the font size of the title.
iris %>% 
  ggvis(x = ~Petal.Width) %>% 
  layer_points(y = ~Petal.Length, fill = ~Species) %>%
  add_title(title = "Petal.Width vs. Petal.Length",
            properties = axis_props(title=list(fontSize=20)))