如何在 AddTimeLine 中设置自定义颜色

How to set custom color in AddTimeLine

我正在尝试使用 leafletleaftime 包创建时间线图。我想在addTimeline中设置自定义颜色来指定每个点到他的组,如下:

library(leaflet)
library(leaftime)
library(geojsonio)

power_d <- data.frame(
  "Latitude" = c(
    33.515556, 38.060556, 47.903056, 49.71, 49.041667, 31.934167,
    54.140586, 54.140586, 48.494444, 48.494444
  ),
  "Longitude" = c(
    129.837222, -77.789444, 7.563056, 8.415278, 9.175, -82.343889,
    13.664422, 13.664422, 17.681944, 17.681944
  ),
  "start" = seq.Date(as.Date("2015-01-01"), by = "day", length.out = 10),
  "end" = seq.Date(as.Date("2015-01-01"), by = "day", length.out = 10) + 1,
color_temp=rep(c("red","blue","green"),len=10)
)

power_geo <- geojsonio::geojson_json(power_d ,lat="Latitude",lon="Longitude")

leaflet() %>%
  addTiles() %>%
  setView(44.0665,23.74667,2) %>%
  addTimeline(data = power_geo,
  timelineOpts = timelineOptions(
      styleOptions = styleOptions(
    radius = 5,     
    color=color_temp,
    fillColor = color_temp,
    fillOpacity = 1
      )
    )
)

不幸的是,我收到以下错误:

Error in lapply(x, f) : object 'color_temp' not found

我也试过把color_temp换成power_d$color_temp,代码运行没有报错,但是点的颜色没有变化。颜色参数在上面的代码中不起作用,为什么?以及如何修复它?

您似乎无法使用标准 styleOptions 传递颜色矢量,但是,?addTimeline 帮助页面中的示例显示了如何根据使用一点 JavaScript 的数据(幸好在示例中提供)。

使用以“# 开头的示例根据数据”设置不同样式的每个点,您需要稍微更改它以指向您的颜色向量,例如将 data.properties.color 更改为 data.properties.color_temp。 运行 下面的代码导致

# code
leaflet(power_geo) %>%
  addTiles() %>%
  setView(44.0665,23.74667,2) %>%
  addTimeline(
    timelineOpts = timelineOptions(
      styleOptions = NULL, 
      pointToLayer = htmlwidgets::JS(
"
function(data, latlng) {
  return L.circleMarker(
    latlng,
    {
      radius: 25,
      color: data.properties.color_temp,
      fillColor: data.properties.color_temp,
      fillOpacity: 1
    }
  );
}
"
      )
    )
  )