Horizontal/Vertical Line in plotly

问题

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.

回答1:

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)))

回答2:

Alternatively, you could add a shape (i.e. line) under layout(). The following example adds a vertical line:

p <- plot_ly(data, x = ~x.data, y = ~y.data, text = ~text.data, type = 'scatter', 
       mode = 'markers', marker = list(size = ~size.data, opacity= 0.5)) %>%
     layout(shapes=list(type='line', x0= 0.2, x1= 0.2, y0=min(allyvalues), y1=max(allyvalues), line=list(dash='dot', width=1)),
       title = 'This is the Title',
       xaxis = list(title = "X-Axis", showgrid = TRUE),
       yaxis = list(title = "Y-Axis", showgrid = TRUE))
p

来源：https://stackoverflow.com/questions/34093169/horizontal-vertical-line-in-plotly

标签

plotly