BoundaryGap about echarts4r HOT 4 CLOSED

Thank you very much! I will use that way and close this issue.

from echarts4r.

I cannot reproduce the issue.

Say we plot something clearer first.

df <- data.frame(
  x = 1:10,
  y = 1:10
)
df %>% 
  e_charts(x) %>% 
  e_line(y) %>% 
  e_tooltip(
    trigger = "axis"
  )

You shouldn't see any boundary gap. Now say we plot your example again, but with tighter boundaries to our graph.

min <- min(mtcars$wt)
max <- max(mtcars$wt)

mtcars %>% 
  e_charts(wt) %>% 
  e_area(qsec) %>% 
  e_x_axis(
    min = min,
    max = max
  ) %>% 
  e_tooltip(trigger = "axis")

The documentation for boundaryGap actually states that the parameter works differently for numerical and categorical data:

• For numerical continuous data pass a vector
• For categorical data pass TRUE or FALSE

mtcars %>% 
  e_charts(wt) %>% 
  e_area(qsec) %>% 
  e_x_axis(
    boundaryGap = c("50%", "50%") # add boundary gap
  ) %>% 
  e_tooltip(trigger = "axis")

If you have categorical:

df <- data.frame(
  x = LETTERS[1:4],
  y = runif(4, 1, 3)
)

df %>% 
  e_chart(x) %>% 
  e_bar(y) %>% 
  e_x_axis(
    boundaryGap = FALSE 
  )

So generally speaking you want to use boundaryGap depending on the data you have and the plot you are trying to create.

Let me know if this helps.

from echarts4r.

Thank you very much for your quick reply! All seems to work very well and I can use the tool_tip as well when using "axis".

However, if I change the e_tooltip to "item" instead of "axis", I do not get the tooltip for the maximum x-value. So for your first example:

df <- data.frame(
  x = 1:10,
  y = 1:10
)
df %>% 
  e_charts(x) %>% 
  e_line(y) %>% 
  e_tooltip(
    trigger = "item"
  )

This doesn't give me a tooltip at x = 10. Do you know what the reason is behind this?

from echarts4r.

Indeed.

Well this is when you could, for instance, use boundaryGap.

# initialise chart
df <- data.frame(
    x = 1:10,
    y = 1:10
)
df %>% 
    e_charts(x) %>% 
    e_line(y) %>% 
    e_tooltip(
        trigger = "item"
    ) %>% 
    e_tooltip(trigger = "item") -> p

Using boundaryGap - a vector for continuous data, as mentioned above.

p %>% e_x_axis(boundaryGap = c(0, .1))

Or min and max

p %>% e_x_axis(min = 0, max = 12)

And there are probably other ways I'm unaware of.

from echarts4r.