R 的传单：如何更改默认的 CSS 集群类

Question

如何更改从 Leaflet for R 界面中定义集群对象的默认 CSS 类？例如，如果我想从 .marker-cluster-small 类中删除不透明度，我该如何在 R 中执行此操作？

这是创建集群类的 CSS：https : //github.com/Leaflet/Leaflet.markercluster/blob/64a2d5711521e56cac8ab863fb658beda5690600/dist/leaflet.markercluster-src.js

例如，我想从集群中删除不透明度，例如

.marker-cluster-small {
    background-color: rgba(181, 226, 140, 1.0);
    }
.marker-cluster-small div {
    background-color: rgba(110, 204, 57, 1.0);
    }

有没有办法从 iconCreateFunction 中做到这一点？

library(leaflet)
leaflet(quakes) %>% addTiles() %>% addMarkers(
  clusterOptions = markerClusterOptions(iconCreateFunction=JS("function (cluster) {    
    var childCount = cluster.getChildCount(); 
    var c = ' marker-cluster-';  
    if (childCount < 100) {  
      c += 'large';  
    } else if (childCount < 1000) {  
      c += 'medium';  
    } else { 
      c += 'small';  
    }    
    return new L.DivIcon({ html: '<div><span>' + childCount + '</span></div>', className: 'marker-cluster' + c, iconSize: new L.Point(40, 40) });

  }"))
)

Answer 1

您可以尝试将内联 CSS 添加到创建图标的函数中的不同标记中，例如：

clusterOptions = markerClusterOptions(iconCreateFunction=JS("function (cluster) {    
    var childCount = cluster.getChildCount();  
    if (childCount < 100) {  
      c = 'rgba(181, 226, 140, 1.0);'
    } else if (childCount < 1000) {  
      c = 'rgba(240, 194, 12, 1);'  
    } else { 
      c = 'rgba(241, 128, 23, 1);'  
    }    
    return new L.DivIcon({ html: '<div style=\"background-color:'+c+'\"><span>' + childCount + '</span></div>', className: 'marker-cluster', iconSize: new L.Point(40, 40) });

  }")

如果您正在使用shiny，您还可以更改iconCreateFunction以将不同的类分配给每个标记，并tags$style在标题中添加以设置这些类的 CSS。下面是一个例子：

ui <- fluidPage(
  tags$head(tags$style(HTML("
  .marker-custom-small {
  background-color: rgba(181, 226, 140, 1);
    }
.marker-customr-small div {
    background-color: rgba(110, 204, 57, 1);
    }

.marker-custom-medium {
    background-color: rgba(241, 211, 87, 1);
    }
.marker-custom-medium div {
    background-color: rgba(240, 194, 12, 1);
    }

.marker-custom-large {
    background-color: rgba(253, 156, 115, 1);
    }
.marker-custom-large div {
    background-color: rgba(241, 128, 23, 1);
    }"))),
  leafletOutput("mymap"))

server<-function(input, output, session) {
  output$mymap <- renderLeaflet({
    leaflet(quakes) %>% addTiles() %>% addMarkers(
      clusterOptions = markerClusterOptions(iconCreateFunction=JS("function (cluster) {    
    var childCount = cluster.getChildCount(); 
    var c = ' marker-custom-';  
    if (childCount < 100) {  
      c += 'large';  
    } else if (childCount < 1000) {  
      c += 'medium';  
    } else { 
      c += 'small';  
    }    
    return new L.DivIcon({ html: '<div><span>' + childCount + '</span></div>', className: 'marker-cluster' + c, iconSize: new L.Point(40, 40) });

  }"))
    )
  })
}

shinyApp(ui,server)

无法弄清楚如何在应用程序leaflet外部使用自定义 CSS shiny。