绘图中的水平/垂直线 [英] Horizontal/Vertical Line in plotly

问题描述

我正在使用plotly程序包，并试图向图形添加水平线.有什么方法可以使用plotly吗?

可以使用ggplot2和ggplotly函数来完成此操作，如下所示:

library(plotly)

p <- ggplot() +
  geom_hline(yintercept = 4) +
  xlim(c(0,10)) +
  ylim(c(0,10))

ggplotly(p)

但是我不能将其添加到现有的绘图区中.

此外，我的图表的轴不是固定的，因此很难(但并非不可能)仅计算一条水平线的x和y坐标系，但我宁愿只自动添加一个. /p>

我已经研究了y0和dy参数，但是我似乎也无法获得使它们起作用的代码.我不太确定他们到底要做什么，但是我认为他们也许正是我想要的?我找不到它们用法的好例子.

解决方案

有两种主要方法(使用数据或纸"坐标).假设数据坐标，最简单的当前方法是通过add_segments():

plot_ly() %>%
  add_segments(x = 4, xend = 4, y = 0, yend = 10) %>%
  add_segments(x = 3, xend = 5, y = 5, yend = 5)

注意我们如何在数据坐标中对这些行的范围进行硬编码；因此，缩放和平移绘图时，该线将被剪切"为这些值.如果您不希望这些线条被剪切，请使用线条形状与外部参照/yref设置为纸张(这会将图形区域设置为0-1比例，而不是x/y数据比例):

vline <- function(x = 0, color = "red") {
  list(
    type = "line", 
    y0 = 0, 
    y1 = 1, 
    yref = "paper",
    x0 = x, 
    x1 = x, 
    line = list(color = color)
  )
}

hline <- function(y = 0, color = "blue") {
  list(
    type = "line", 
    x0 = 0, 
    x1 = 1, 
    xref = "paper",
    y0 = y, 
    y1 = y, 
    line = list(color = color)
  )
}

plot_ly() %>%
  layout(shapes = list(vline(4), hline(5)))

I'm using the plotly package and I'm trying to add a horizontal line to a graph. Is there any way of doing it using plotly?

It can be done using ggplot2 and the ggplotly function as shown below:

library(plotly)

p <- ggplot() +
  geom_hline(yintercept = 4) +
  xlim(c(0,10)) +
  ylim(c(0,10))

ggplotly(p)

But I can't add this to an existing plotly plot.

Also, the axis of my charts are not fixed, so it would be difficult (but not impossible) to just work out an x and y coordinate system for a horizontal line, but I'd rather just add one automatically.

I've looked into the y0 and dy arguments, but I can't seem to get the code for those to work, either. I'm not quite sure what they do exactly, but I think they're maybe what I'm looking for? I can't find good examples of their usage.

解决方案

There are two main ways to do this (using either data or 'paper' coordinates). Assuming data coordinates, the easiest current way is via add_segments():

plot_ly() %>%
  add_segments(x = 4, xend = 4, y = 0, yend = 10) %>%
  add_segments(x = 3, xend = 5, y = 5, yend = 5)

Notice how we've hard coded the extent of these lines in data coordinates; so when zooming and panning the plot, the line will be "clipped" at those values. If you don't want these lines to be clipped, use a line shape with xref/yref set to paper (this puts the graph region on a 0-1 scale, rather than on the x/y data scale):

vline <- function(x = 0, color = "red") {
  list(
    type = "line", 
    y0 = 0, 
    y1 = 1, 
    yref = "paper",
    x0 = x, 
    x1 = x, 
    line = list(color = color)
  )
}

hline <- function(y = 0, color = "blue") {
  list(
    type = "line", 
    x0 = 0, 
    x1 = 1, 
    xref = "paper",
    y0 = y, 
    y1 = y, 
    line = list(color = color)
  )
}

plot_ly() %>%
  layout(shapes = list(vline(4), hline(5)))

这篇关于绘图中的水平/垂直线的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！