13.4 双轴图

双轴图

模拟一组数据

set.seed(2020)
dat <- data.frame(
  dt = seq(from = as.Date("2020-01-01"), to = as.Date("2020-01-31"), by = "day"),
  search_qv = sample(100000:1000000, size = 31, replace = T)
) %>%
  transform(valid_click_qv = sapply(search_qv, rbinom, n = 1, prob = 0.5)) %>%
  transform(qv_ctr = valid_click_qv / search_qv)

hoverinfo = "text" 表示 tooltips 使用指定的 text 映射，而 visible = "legendonly" 表示图层默认隐藏不展示，只在图例里显示，有时候很多条线，默认只是展示几条而已。举例如下

plot_ly(data = dat) %>%
  add_bars(
    x = ~dt, y = ~search_qv, color = I("gray80"), name = "搜索 QV",
    text = ~ paste0(
      "日期：", dt, "<br>",
      "点击 QV：", format(valid_click_qv, big.mark = ","), "<br>",
      "搜索 QV：", format(search_qv, big.mark = ","), "<br>",
      "QV_CTR：", scales::percent(qv_ctr, accuracy = 0.01), "<br>"
    ),
    hoverinfo = "text"
  ) %>%
  add_bars(
    x = ~dt, y = ~valid_click_qv, color = I("gray60"), name = "点击 QV",
    text = ~ paste0(
      "日期：", dt, "<br>",
      "点击 QV：", format(valid_click_qv, big.mark = ","), "<br>",
      "搜索 QV：", format(search_qv, big.mark = ","), "<br>",
      "QV_CTR：", scales::percent(qv_ctr, accuracy = 0.01), "<br>"
    ), visible = "legendonly",
    hoverinfo = "text"
  ) %>%
  add_lines(
    x = ~dt, y = ~qv_ctr, name = "QV_CTR", yaxis = "y2", color = I("gray40"),
    text = ~ paste("QV_CTR：", scales::percent(qv_ctr, accuracy = 0.01), "<br>"), 
    hoverinfo = "text",
    line = list(shape = "spline", width = 3, dash = "line")
  ) %>%
  layout(
    title = "",
    yaxis2 = list(
      tickfont = list(color = "black"),
      overlaying = "y",
      side = "right",
      title = "QV_CTR（%）",
      # ticksuffix = "%", # 设置坐标轴单位
      tickformat = '.1%', # 设置坐标轴刻度
      showgrid = F, automargin = TRUE
    ),
    xaxis = list(title = "日期", showgrid = F, showline = F),
    yaxis = list(title = " ", showgrid = F, showline = F),
    margin = list(r = 20, autoexpand = T),
    legend = list(
      x = 0, y = 1, orientation = "h",
      title = list(text = " ")
    )
  )

图 13.4: 双轴图