R单张图船舶方向图

我掌握了船只/船只的位置及其航行路线的信息。我想把它们画在一张带有自定义图标的传单地图上，看起来像一艘船。我发现

glyphicons

中的

标记
图标最合适。以下是一些数据：

dput(head(x))
structure(list(boatName = c("Conti Benguela", "Sunny Bay", "Sunny Horizon", 
"FMT URLA", "Qi Xiang 22", "STI Solidarity"), lat = c(37.115365, 
38.4772017, 14.632, 56.80515, 51.31172, -2.2783283), lon = c(15.2682183, 
-8.7888783, -79.5806667, 7.601885, -143.5678933, 46.6328383), 
    cog = c("16", "331", "182", "21", "288", "72")), row.names = c(NA, 
6L), class = "data.frame")

cog
表示图标转换为旋转角度的地面路线。我正在使用以下代码当前绘制船舶的位置以及根据船舶航向的旋转：

shipIcon <- makeAwesomeIcon("tag",iconRotate = x$cog)
leaflet() %>% addTiles() %>% 
  addAwesomeMarkers(lng=x$lon,lat=x$lat,icon=shipIcon,popup = x$boatName)

shipIcon%addTiles（）%%>%
添加标记（lng=x$lon，lat=x$lat，icon=shipIcon，popup=x$boatName）

但是，正如您所看到的，
makeAwesomeIcon
为图标添加了一个我不想要的背景标记。我已经看过了，而且后者正是我想要做的。在没有标记背景的情况下，如何实现显示自定义船舶图标的任务，并根据其转向路线旋转？
概述
为了绘制图标方向，我遵循了三个步骤：

要在传单地图上呈现HTML图标，我将替换为

为了启用图标旋转，我存储了和的本地副本

最后，为了指定图标应该旋转多少度，我将
cog
变量放在
rotationAngle
参数的
markerOptions（）
中

注意：步骤2和步骤3取自对SO问题的回答和评论。所有的功劳都归于@rrs和@ufo

在做任何事情之前，我运行了您的代码并获得了以下传单地图：


使用
boat.icon
，图标被旋转，但更难阅读：


最后，我决定使用亮橙色和北箭头图标来显示位置和旋转角度：


代码
您可能希望使用HTML图标来代替依赖
makeAwesomeIcon（）
。请看这里的例子：。@aspiringurbandatascientist感谢您的评论，但这并不能真正解决我的问题。我正在查看图标的旋转，这可以通过
makeAwesomeIcon（）
实现，但不需要标记背景。
icons（）
函数没有旋转参数。非常感谢您的详细回答。完全解决了我的问题。我正在为船只使用一个定制图标，现在看起来相当不错。分享图片。@Dhiraj那些飞船图标看起来很棒-读者可以看到密度和旋转！感谢分享图片和发布一个很棒的问题。谢谢你的回答。如果希望图标从图标图像的中心旋转，请更改.js文件的此行
this.options.rotationOrigin=this.options.rotationOrigin | | iconAnchor | | | center-bottom'
to
this.options.rotationOrigin=this.options.rotationOrigin | | | iconAnchor | | | | center |
# load necessary packages
library( htmltools )
library( htmlwidgets )
library( leaflet )

# this is taken from: https://gist.github.com/jcheng5/c084a59717f18e947a17955007dc5f92
# "Leaflet.rotatedMarker" is taken from https://raw.githubusercontent.com/bbecquet/Leaflet.RotatedMarker/master/leaflet.rotatedMarker.js
rotatedMarker <- 
  htmlDependency( name = "Leaflet.rotatedMarker" # note: this .js file has to be copied and stored in your current working directory 
                  , version = "0.1.2"
                  , src = normalizePath( path = getwd() )
                  , script = "leaflet.rotatedMarker.js" )

# this is taken from: https://gist.github.com/jcheng5/c084a59717f18e947a17955007dc5f92
registerPlugin <- function(map, plugin) {
  map$dependencies <- c(map$dependencies, list(plugin))
  map
}

# store data
df <-
  structure(list(boatName = c("Conti Benguela", "Sunny Bay", "Sunny Horizon", 
                              "FMT URLA", "Qi Xiang 22", "STI Solidarity"), lat = c(37.115365, 
                                                                                    38.4772017, 14.632, 56.80515, 51.31172, -2.2783283), lon = c(15.2682183, 
                                                                                                                                                 -8.7888783, -79.5806667, 7.601885, -143.5678933, 46.6328383), 
                 cog = c("16", "331", "182", "21", "288", "72")), row.names = c(NA, 
                                                                                6L), class = "data.frame")

# store boat png
boat.file <- "http://cdn.onlinewebfonts.com/svg/download_498189.png"

# store north arrow png
north.arrow.file <- "https://upload.wikimedia.org/wikipedia/commons/a/aa/Aiga_uparrow.svg"

# make boat icon
boat.icon <- 
  makeIcon( iconUrl = boat.file
            , iconWidth = 25
            , iconHeight = 25 )

# make north arrow icon
north.arrow.icon <-
  makeIcon( iconUrl = north.arrow.file
            , iconWidth = 10
            , iconHeight = 10 )

# display leaflet map
leaflet( data = df ) %>%
  addProviderTiles( provider = "OpenStreetMap.BlackAndWhite" ) %>%
  registerPlugin( plugin = rotatedMarker ) %>%
  addCircleMarkers( lng = ~lon
                    , lat = ~lat
                    , radius = 5
                    , fillColor = "orange"
                    , fillOpacity = 1
                    , stroke = FALSE ) %>%
  addMarkers( lng = ~lon
              , lat = ~lat
              , label = ~boatName
              , icon = north.arrow.icon
              , options = markerOptions( rotationAngle = ~cog ) )

# end of script #

R version 3.4.4 (2018-03-15)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS High Sierra 10.13.2

Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.4/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods  
[7] base     

other attached packages:
[1] leaflet_1.1.0.9000 htmlwidgets_1.0    htmltools_0.3.6   

loaded via a namespace (and not attached):
 [1] shiny_1.0.5     compiler_3.4.4  magrittr_1.5   
 [4] R6_2.2.2        markdown_0.8    tools_3.4.4    
 [7] yaml_2.1.18     Rcpp_0.12.16    crosstalk_1.0.0
[10] jsonlite_1.5    digest_0.6.15   xtable_1.8-2   
[13] httpuv_1.3.6.2  mime_0.5