我有有关船只位置及其航行路线的信息。我想将它们绘制在传单地图上，并带有看起来像船的自定义图标。我找到了"tags"图标来自glyphicons成为最合适的。这里有一些可以使用的数据：
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表示地面上的路线，该图标转换为旋转角度。我正在使用以下代码当前绘制船舶的位置以及根据船舶转向的航线的旋转：
shipIcon <- makeAwesomeIcon("tag",iconRotate = x$cog)
leaflet() %>% addTiles() %>%
addAwesomeMarkers(lng=x$lon,lat=x$lat,icon=shipIcon,popup = x$boatName)
然而正如你所看到的，makeAwesomeIcon向我不想要的图标添加背景标记。我看过this也this后者正是我想做的。如何实现在没有标记背景的情况下显示自定义船舶图标的任务，该图标根据其转向的路线进行旋转？
为了绘制图标方向，我遵循了三个步骤：
为了将 HTML 图标渲染到传单地图上，我交换了leaflet::makeAwesomeIcon() for leaflet::makeIcon().
为了启用图标旋转，我存储了一个本地副本leaflet.rotatedMarker.js 文件 and 将此插件注册为传单对象.
最后，为了指定图标应旋转多少度，我放置了cog里面的变量rotationAngle内的论证markerOptions() from leaflet::addMarkers().
注意：步骤 2 和 3 取自 SO 问题的答案和评论传单包中的图标旋转。所有功劳都归功于@rrs 和@Ufos。
在做任何事情之前，我运行了你的代码并得到了以下传单地图：
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()和指北针图标显示位置和旋转角度：
# 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