我正在试验Shiny中某些地图的leaflet
包。我希望能够有一个基础地图,数据将更改,然后重新映射。但是,我正在尝试使用leafletProxy
函数,其中有一个基本映射,我只是更改添加的数据点。所有这些都可行,但地图不会缩放到数据点位置。它仍处于最远的变焦范围。
重现问题的代码:
library(shiny)
library(leaflet)
r_colors <- rgb(t(col2rgb(colors()) / 255))
names(r_colors) <- colors()
ui <- fluidPage(
leafletOutput("mymap"),
p(),
actionButton("goButton", "New Points")
)
server <- function(input, output, session) {
output$mymap <- renderLeaflet({
leaflet() %>%
addProviderTiles("Stamen.TonerLite",
options = providerTileOptions(noWrap = TRUE)
)
})
observeEvent(input$goButton, {
points <- cbind(rnorm(40) * 2 + 13, rnorm(40) + 48)
leafletProxy('mymap', session) %>%
clearMarkers() %>%
addMarkers(data = points)
})
}
shinyApp(ui, server)
我希望地图在添加新点后自动放大。
答案 0 :(得分:3)
尝试在leafletProxy()
中添加参数“fitBounds”leafletProxy('mymap', session) %>%
clearMarkers() %>%
addMarkers(data = points) %>%
fitBounds(lng1 = max(points$long),lat1 = max(points$lat),
lng2 = min(points$long),lat2 = min(points$lat))
答案 1 :(得分:1)
我修改了G. Cocca的答案(主要是通过添加“点”的数据框)来获得此信息:
library(shiny)
library(leaflet)
r_colors <- rgb(t(col2rgb(colors()) / 255))
names(r_colors) <- colors()
ui <- fluidPage(
leafletOutput("mymap"),
p(),
actionButton("goButton", "New Points")
)
server <- function(input, output, session) {
output$mymap <- renderLeaflet({
leaflet() %>%
addProviderTiles("Stamen.TonerLite",
options = providerTileOptions(noWrap = TRUE)
)
})
observeEvent(input$goButton, {
points <- data.frame("long" = rnorm(40) * 2 + 13,
"lat" = rnorm(40) + 48)
leafletProxy('mymap', session) %>%
clearMarkers() %>%
addMarkers(data = points) %>%
fitBounds(lng1 = max(points$long),lat1 = max(points$lat),
lng2 = min(points$long),lat2 = min(points$lat))
})
}
shinyApp(ui, server)