library(shiny)
library(leaflet)
library(RMySQL)
library(DBI)
data <- function(con){
con <- dbConnect(MySQL(), dbname="", host="localhost",
port = , user="",
password="")
dbSendQuery(con, "SEt NAMES euckr")
d <- dbGetQuery(con, "select * from accidents")
dbDisconnect(con)
}
原始数据(d(包含以下信息：事故发生地点、事故发生年份、事故发生次数、经度、纬度等。
这是ui
ui <- navbarPage("Interactive Map",
tabPanel("Map",
leafletOutput("m", height=800),
tags$style("
#controls {
backgropund-color: #ddd;
opacity: 0.7;
}
#controls:hover{
opacity: 1;
}
"),
absolutePanel(id = "controls", class="panel panel-default",
fixed =TRUE, draggable = TRUE, top=60, left="auto",
right=20, bottom ="auto", width=250, height=450,
sliderInput("year",
"years:",
min=min(d$acci_year),
max=max(d$acci_year),
value=range(d$acci_year),
step=1, sep=""))))
这是服务器
server <- function(input, output, session){
filteredData <- reactive({
d[d$acci_year >= input$year[1] & d$acci_year <= input$year[2],]
})
d_colour <- colorFactor("viridis", d$acci_type)
output$m <- renderLeaflet({
leaflet(d) %>%
setView(lng = 126.97806, lat=37.56667, zoom=13) %>%
addTiles() %>%
addCircles(lng=~d$longitude, lat=~d$latitude, color=~d_colour(d$acci_type), radius=20,
popup=paste0("<br>accident place:", d$accident_address, "<br>accident year:", d$acci_year, "<br>발생건수:", d$발생건수,
"<br>사상자수:", d$사상자수, "<br>사망자수:", d$사망자수,
"<br>중상자수:", d$중상자수, "<br>경상자수:", d$경상자수,
"<br>부상자수:", d$부상자수)) %>%
addLegend(position = "bottomleft",
title = "types of accident",
pal = d_colour, values = ~d$acci_type, opacity = 1)
})
d_colour <- colorFactor("viridis", d$acci_type)
observe({
leafletProxy("m", data=filteredData()) %>%
clearShapes() %>%
addCircles(lng=~d$longitude, lat=~d$latitude, color=~d_colour(d$acci_type), radius=20,
popup=paste0("<br>accident place:", d$accident_address, "<br>accident year:", d$acci_year, "<br>발생건수:", d$발생건수,
"<br>사상자수:", d$사상자수, "<br>사망자수:", d$사망자수,
"<br>중상자수:", d$중상자수, "<br>경상자수:", d$경상자수,
"<br>부상자수:", d$부상자수))
})
}
shinyApp(ui=ui, server=server)
我为你把一些变量韩语改成了英语！由于这个功能，我一个星期都不能做下一步了。。非常感谢你的回答！！
更新
错误仍然存在于您的代码中——您正在替换地图中的所有点，因此您的地图不会用sliderInput更改。您需要通过以下方式更改lng=~d$longitude, lat=~d$latitude,：lng=~longitude, lat=~latitude,这意味着你不想在地图中添加所有的圆圈~d$longitude lat=~d$latitude，而只想添加经过滑动输入lng=~longitude lat=~latitude过滤的圆圈。
当您使用filteredData((进行筛选时，您不希望d中的所有信息都像d$lat一样。例如，您只希望通过SliderInput:~lat进行筛选。
旧答案
代码中的错误在这里：
leafletProxy("m", data=filteredData()) %>%
clearShapes() %>%
addCircles(lng=~d$longt, lat=~d$lat, color=~d_colour(d$acci_type), # this line
您将用创建地图的相同点(d$long和d$lat(替换这些点，因此地图不会更改。
要解决此问题，您需要通过filteredData((列放置点：
leafletProxy("m", data=filteredData()) %>%
clearShapes() %>% clearMarkers() %>%
addCircles(lng=~longt, lat=~lat, #don't forget ~ to specify that the column comes from filteredData()
color=~d_colour(acci_type),
这里有一个完全可复制的例子：
library(shiny)
library(leaflet)
d=data.frame(
acci_year=c(2012,2013,2014,2015),
longt=c(126.97806,126.97822126,125.97806,124.97806),
lat=c(37.56667,35.56667,38.56667,37.56667),
acci_type=c("low","high","medium","high"),
accident_happen_place=c("word1","word2","word3","word4"),
accident_2 =c("anotherword1","anotherword2","anotherword3","anotherword4"),
accident_3=c("otheword1","otheword2","otheword3","otheword4"),
accident_4 =c("example1","example2","example3","example4"),
accident_5 =c("anotherexample1","anotherexample2","anotherexample3","anotherexample4"),
accident_6 =c("onemoreexample1","onemoreexample2","onemoreexample3","onemoreexample4"),
accident_7 =c("ex1","ex2","ex3","ex4"),
accident_8 =c("2_ex1","2_ex2","2_ex3","2_ex4")
)
ui <- navbarPage("Interactive Map",
tabPanel("Map",
leafletOutput("m", height=800),
tags$style("
#controls {
backgropund-color: #ddd;
opacity: 0.7;
}
#controls:hover{
opacity: 1;
}
"),
absolutePanel(id = "controls", class="panel panel-default",
fixed =TRUE, draggable = TRUE, top=60, left="auto",
right=20, bottom ="auto", width=250, height=450,
sliderInput("year",
"years:",
min=min(d$acci_year),
max=max(d$acci_year),
value=2012:2019,
step=1, sep=""))))
server <- function(input, output, session){
filteredData <- reactive({
d[d$acci_year >= input$year[1] & d$acci_year <= input$year[2],]
})
d_colour <- colorFactor("viridis", d$acci_type)
output$m <- renderLeaflet({
leaflet(d) %>%
setView(lng = 126.97806, lat=37.56667, zoom=7) %>%
addTiles() %>%
addCircles(lng=~d$longt, lat=~d$lat, color=~d_colour(d$acci_type), radius=20,
popup=paste0("<br>사고장소:", d$accident_happen_place, "<br>accident_2:", d$accident_2, "<br>accident_3:", d$accident_3,
"<br>accident_4:", d$accident_4, "<br>accident_5:", d$accident_5,
"<br>accident_6:", d$accident_6, "<br>accident_7:", d$accident_7,
"<br>accident_8:", d$accident_8)) %>%
addLegend(position = "bottomleft",
title = "사고유형",
pal = d_colour, values = ~d$acci_type, opacity = 1)
})
d_colour <- colorFactor("viridis", d$acci_type)
observe({
leafletProxy("m", data=filteredData()) %>%
clearShapes() %>%
addCircles(lng=~longt, lat=~lat, color=~d_colour(acci_type), radius=20,
popup=paste0("<br>사고장소:", d$accident_happen_place, "<br>발생년도:", d$accident_2, "<br>accident_3:", d$accident_3,
"<br>accident_4:", d$accident_4, "<br>accident_5:", d$accident_5,
"<br>accident_6:", d$accident_6, "<br>accident_7:", d$accident_7,
"<br>accident_8:", d$accident_8) )
} )
}
shinyApp(ui, server)
您不需要使用dbGetquery两次：
d <- dbGetQuery(con, "select * from accidents"
dbGetQuery(con,d)
这种方式已经很完美了：
d <- dbGetQuery(con, "select * from accidents")