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app.R
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library(shiny)
library(shinydashboard)
library(leaflet)
library(igraph)
library(sf)
library(DT)
options(digits=5,nsmall=2)
graph <- readRDS("sg graph 20200513.rds")
vertexGeom=graph %>%
vertex_attr("geometry") %>%
st_as_sfc(crs=4326)
initStart <- c(103.9897892,1.3620652)
initEnd <- c(103.7757289,1.2944849)
initNearest <- st_nearest_feature(
st_as_sfc(list(st_point(initStart),st_point(initEnd)),crs=4326),
vertexGeom)
initPath <- shortest_paths(graph,
initNearest[1],initNearest[2],
weights=E(graph)$time,
output="epath")
ui <- dashboardPage(
dashboardHeader(title="SG Routing",
tags$li(a(href="http://apps.artidata.io",
icon("home"),
title="apps.artidata.io",
style="cursor: pointer;"),
class="dropdown")),
dashboardSidebar(disable=T),
dashboardBody(
fluidRow(
column(width=8,
box(width=NULL,
htmlOutput(outputId="instruction")),
box(width=NULL,
leafletOutput(outputId="map",
width="100%",
height=500))),
column(width=4,
box(width=NULL,
textOutput(outputId="routeStart"),
tags$style(type="text/css", "#routeStart {white-space: pre-wrap;}"),
textOutput(outputId="routeEnd"),
tags$style(type="text/css", "#routeEnd {white-space: pre-wrap;}"),
htmlOutput(outputId="pinStart"),
tags$style(type="text/css", "#routeStart {white-space: pre-wrap;}"),
htmlOutput(outputId="pinEnd"),
tags$style(type="text/css", "#routeEnd {white-space: pre-wrap;}")),
box(width=NULL,
DTOutput(outputId="pathAttr"))
))
)
)
server <- function(input, output, session) {
xRouteStart<-reactiveVal(initStart[1])
yRouteStart<-reactiveVal(initStart[2])
output$routeStart<-renderText(sep="",{
c("Route Start: ",
format(yRouteStart(),nsmall=7),", ",
format(xRouteStart(),nsmall=7))})
xRouteEnd<-reactiveVal(initEnd[1])
yRouteEnd<-reactiveVal(initEnd[2])
output$routeEnd<-renderText(sep="",{
c("Route End: ",
format(yRouteEnd(),nsmall=7),", ",
format(xRouteEnd(),nsmall=7))})
xPinStart<-reactiveVal(initStart[1])
yPinStart<-reactiveVal(initStart[2])
output$pinStart<-renderText(sep="",{
c("<span style='color:#00BA38'>Pin Start: ",
format(yPinStart(),nsmall=7),", ",
format(xPinStart(),nsmall=7),"</span>")})
xPinEnd<-reactiveVal(initEnd[1])
yPinEnd<-reactiveVal(initEnd[2])
output$pinEnd<-renderText(sep="",{
c("<span style='color:#F8766D'>Pin End: ",
format(yPinEnd(),nsmall=7),", ",
format(xPinEnd(),nsmall=7),"</span>")})
instruction<-reactiveVal("Drag and drop pins to a new coordinate!")
dfCoord <- reactive({
data.frame(lng=c(xRouteStart(),xRouteEnd()),
lat=c(yRouteStart(),yRouteEnd()))})
path <- reactive({
nearest <- st_nearest_feature(st_as_sf(dfCoord(),coords=c("lng","lat"),crs=4326),vertexGeom)
shortest_paths(graph,
nearest[1],nearest[2],
weights=E(graph)$time,
output="epath")})
pathAttr <- reactive({
data.frame(name=graph %>% edge_attr("name",path()$epath[[1]]),
distance=graph %>% edge_attr("distance",path()$epath[[1]]),
time=graph %>% edge_attr("time",path()$epath[[1]]))})
output$map <- renderLeaflet({
leaflet() %>%
addProviderTiles(providers$CartoDB.Positron,
options = providerTileOptions(noWrap = TRUE))%>%
addMeasure(
primaryLengthUnit = "meters",
primaryAreaUnit = "sqmeters",
activeColor = "#3D535D",
completedColor = "#7D4479") %>%
addAwesomeMarkers(
lng=initStart[1],
lat=initStart[2],
options=markerOptions(draggable=T),
icon=awesomeIcons(
icon = 'ios-close',
iconColor = 'black',
library = 'ion',
markerColor = "green"),
layerId="pinStart")%>%
addAwesomeMarkers(
lng=initEnd[1],
lat=initEnd[2],
options=markerOptions(draggable=T),
icon=awesomeIcons(
icon = 'ios-close',
iconColor = 'black',
library = 'ion',
markerColor = "red"),
layerId="pinEnd")})
observeEvent(input$map_marker_mouseout,{
#print(input$map_marker_mouseout)
marker <- input$map_marker_mouseout
if(marker$id=="pinStart"){
xPinStart(marker$lng)
yPinStart(marker$lat)
if(xPinStart()!=xRouteStart()|
yPinStart()!=yRouteStart()){
instruction("Click the <span style='color:#00BA38'>green pin</span> to update the route's starting coordinate!")
}
}else if(marker$id=="pinEnd"){
xPinEnd(marker$lng)
yPinEnd(marker$lat)
if(xPinEnd()!=xRouteEnd()|
yPinEnd()!=yRouteEnd()){
instruction("Click the <span style='color:#F8766D'>red pin</span> to update the route's ending coordinate!")}}})
observeEvent(input$map_marker_click,{
marker <- input$map_marker_click
if(marker$id=="pinStart"){
xRouteStart(marker$lng)
yRouteStart(marker$lat)
}else if(marker$id=="pinEnd"){
xRouteEnd(marker$lng)
yRouteEnd(marker$lat)
}
instruction("Drag and drop pins to a new coordinate!")})
output$instruction<-renderText({instruction()})
output$pathAttr<-renderDT({
datatable(aggregate(.~name, pathAttr(), sum),
style="bootstrap4",
colnames = c("Road Name","Distance (m)","Time (s)"),
autoHideNavigation=F,
options=list(searching=F,pageLength=10,paging=F,info=T,ordering=F)) %>%
formatRound(columns=c("distance","time"),digits=1,mark="")})
observe({
leafletProxy("map") %>%
clearShapes()%>%
addPolylines(data=graph %>%
edge_attr("geometry",path()$epath[[1]]) %>%
st_as_sfc(crs=4326) %>%
st_combine(),
label=HTML("Distance = ",graph %>% edge_attr("distance",path()$epath[[1]]) %>% sum() %>% format(nsmall=0)," m",
"</br>Time = ",graph %>% edge_attr("time",path()$epath[[1]]) %>% sum() %>% format(nsmall=0)," s"),
weight=4,
labelOptions=labelOptions(permanent=T,opacity=0.8))})
}
shinyApp(ui, server)