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我有关于船只/船只的位置以及它们正在转向的路线的信息。我想将它们绘制在带有自定义图标的传单地图上，该图标看起来像一艘船。我发现"tags"图标 fromglyphicons最合适。这里有一些数据可以玩：

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指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根据船舶转向的路线绘制船舶的位置和旋转：

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为我不想要的图标添加了一个背景标记。我已经看过这个以及这个，后者正是我想要做的。我怎样才能完成我的任务，即按照它在没有标记背景的情况下转向的过程显示带有旋转的自定义船舶图标？

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1 回答 1

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概述

为了绘制图标方向，我遵循了三个步骤：

  1. 为了在传单地图上呈现 HTML 图标，我换成leaflet::makeAwesomeIcon()了leaflet::makeIcon().

  2. 为了启用图标旋转，我存储了一个 leaflet.rotatedMarker.js 文件的本地副本，并将这个插件注册为一个传单对象。

  3. 最后，为了指定图标应该旋转多少度，我将cog变量放在 from 中的参数rotationAngle内。markerOptions()leaflet::addMarkers()

注意：第 2 步和第 3 步取自对传单包中 SO 问题图标旋转的答案和评论。所有功劳归于@rrs 和@Ufos。

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：

原码SS

使用boat.icon，图标被旋转但更难阅读：

SS 的船图标

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

橙色图标的 SS + 指北针图标

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 #

会话信息

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
于 2018-05-23T04:22:44.113 回答