R传单情节船方向

Question

我有关于船只/轮船位置及其驾驶路线的信息。我想用看起来像船的自定义图标将它们绘制在传单 map 上。我发现 glyphicons 中的 "tags" 图标最合适。这里有一些数据可供使用:

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 表示地面上的路线，图标转换为旋转角度。我正在使用以下代码来绘制船只的位置和根据船只转向的路线进行的旋转:

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

但是如您所见，makeAwesomeIcon 向我不想要的图标添加了背景标记。我看过this以及this后者正是我想做的。我怎样才能完成显示自定义船舶图标的任务，根据它在没有标记背景的情况下转向的路线旋转？

Answer 1

概览

为了绘制图标方向，我遵循了三个步骤:

1. 为了将 HTML 图标渲染到传单 map 上，我交换了 leaflet::makeAwesomeIcon()对于leaflet::makeIcon() .

2. 为了启用图标旋转，我存储了 a leaflet.rotatedMarker.js file 的本地副本和 registered this plugin as a leaflet object .

3. 最后，为了指定图标应旋转多少度，我将 cog 变量放在 markerOptions( ) 来自 leaflet::addMarkers() .

注意:第 2 步和第 3 步取自 SO 问题的答案和评论 icon rotation in leaflet package .所有功劳归功于@rrs 和@Ufos。

在做任何事情之前，我运行了您的代码并得到了以下传单 map :

使用 boat.icon，图标被旋转但更难阅读:

最终，我决定使用亮橙色 leaflet::addCircleMarkers()和指北针图标以显示位置和旋转角度:

代码

# 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 #

session 信息

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