R，传单多边形添加黑色边框

Question

我想在我的多边形周围添加黑色边框。看到下面的图片我到目前为止。

我用这个代码。我不知道我可以如何包含一个zip文件，使其可重现。

library("rgdal") 
library("leaflet") 

amsterdam.districts <- shapefile("~/R/Shiny/Shapefiles/sd2010zw_region.shp") 
amsterdam.districts <- spTransform(amsterdam.districts, CRS("+init=epsg:4326")) 
amsterdam.districts$STADSDEELN<- c("Centrum","Westpoort","West","Nieuw West","Zuid","Oost","Noord","Zuidoost") 

amsterdam.districts$SDNUMMER=as.factor(amsterdam.districts$SDNUMMER) 
factpal=colorFactor(brewer.pal(n = 11, name ="Spectral") , amsterdam.districts$SDNUMMER) 

    leaflet() %>% 
    addPolygons(
     data =amsterdam.districts, 
     stroke = FALSE, fillOpacity = 0.5, smoothFactor = 0.5, 
     color = "grey", 
     fillColor = ~factpal(SDNUMMER), 
     layerId = amsterdam.districts@data$STADSDEELN)%>% 
    addProviderTiles("CartoDB.Positron", options= providerTileOptions(opacity = 1)) 

感谢您的阅读！

的Martijn

Answer 1

这里有一个重复的例子：

library(mapview) 
library(RColorBrewer) 

factpal <- colorFactor(brewer.pal(n = 11, name ="Spectral") , gadmCHE$NAME_1) 

leaflet() %>% 
    addPolygons(
    data = gadmCHE, 
    stroke = TRUE, fillOpacity = 0.5, smoothFactor = 0.5, 
    color = "black", opacity = 1, 
    fillColor = ~factpal(gadmCHE$NAME_1)) %>% 
    addProviderTiles("CartoDB.Positron", options = providerTileOptions(opacity = 1)) 

您只需设置stroke = TRUE和color = "black"得到边界。请注意，我还设置了opacity = 1以防止半透明边框。