Graphing Maine Power Outages With R/Shiny : Preview: http://162.243.111.4:3838/outages/

server.R

library(shiny)
library(maps)
library(maptools)
library(ggplot2)
library(plyr)
library(XML)

# Define server logic required to plot various variables against mpg
shinyServer(function(input, output, session) {
  
    autoInvalidate <- reactiveTimer(60*1000, session)
  
    output$cmpPlot <- renderPlot({
      autoInvalidate()
			cmp.url <- "http://www3.cmpco.com/OutageReports/CMP.html"
			# get outage table (first one on the cmp.url page)
			cmp.node <- getNodeSet(htmlParse(cmp.url),"//table")[[1]]
			cmp.tab <<- readHTMLTable(cmp.node,
			                          header=c("subregion","total.customers","without.power"),
			                          skip.rows=c(1,2,3),
			                          trim=TRUE, stringsAsFactors=FALSE)

			if (!is.null(cmp.tab)) {
				OUTAGES <<- 1 
			  # clean up the table to it's easier to work with
			  cmp.tab <<- cmp.tab[-nrow(cmp.tab),] # get rid of last row
			  cmp.tab$subregion <<- tolower(cmp.tab$subregion)
			  cmp.tab$total.customers <<- as.numeric(gsub(",","",cmp.tab$total.customers))
			  cmp.tab$without.power <<- as.numeric(gsub(",","",cmp.tab$without.power))
			  cmp.tab$zones <<- cut(cmp.tab$without.power, breaks=c(0,100,500,1000,max(cmp.tab$without.power)))
			} else {
				OUTAGES <<- 0
			}

			# get maine map with counties
			county.df <- map_data('county')
			me <- subset(county.df, region=="maine")

			# get a copy with just the affected counties
			out <- subset(me, subregion %in% cmp.tab$subregion)

			if (!is.null(cmp.tab)) {
			  # add outage into to it
			  out <- join(out, cmp.tab)
			}

			# plot the map
			gg <- ggplot(me, aes(long, lat, group=group))
			gg <- gg + geom_polygon(fill=NA, colour='gray50', size=0.25)
			if (!is.null(cmp.tab)) {
			  gg <- gg + geom_polygon(data=out, aes(long, lat, group=group, fill=zones), 
			                        colour='gray50', size=0.25)
			}
			if (!is.null(cmp.tab)) {
			  gg <- gg + scale_fill_brewer(type="seq", palette="BuGn", labels=c("0-100", "100-1000", sprintf("1000-%s",max(cmp.tab$without.power))))
			}
			gg <- gg + coord_map()
			gg <- gg + theme_bw()
			gg <- gg + labs(x="", y="", title="")
			gg <- gg + theme(plot.background = element_rect(fill = "transparent",colour = NA),
			                 panel.border = element_blank(),
			                 panel.background =element_rect(fill = "transparent",colour = NA),
			                 panel.grid = element_blank(),
			                 axis.text = element_blank(),
			                 axis.ticks = element_blank(),
			                 legend.position="left",
			                 legend.title=element_blank())
			print(gg)

    }, res=150, height=700, width=700, bg="transparent")
	
	output$ts <- renderText({
        autoInvalidate()
		sprintf("<h3>%s</h3>",format(Sys.time(), "%a %b %d %X %Y %Z"))
	})

	 if (OUTAGES == 1) {
	
	    output$details <- renderDataTable({
	      autoInvalidate()
		  # capitalize the county name (works with multiple word names)
		  cmp.tab$subregion <<- gsub("(^|[[:space:]])([[:alpha:]])", "\\1\\U\\2", cmp.tab$subregion, perl=TRUE)
		  # make the column titles look nice
		  colnames(cmp.tab) <- c("County", "Total Customers", "Total w/o Power")
		  # don't need the binned column
	      cmp.tab[,c(1,2,3)]
	    })
			
		} else {
			output$details <- renderText("No Outages")
		}
})

ui.R

library(shiny)

# Define UI for miles per gallon application
shinyUI(bootstrapPage(

  tags$head(
    tags$title('Central Maine Power Live Outage Map')
  ),
  
  tags$head(
	  tags$link(href='http://fonts.googleapis.com/css?family=Lato:300,400', rel = 'stylesheet', type = 'text/css')
  ),

  tags$head(tags$style(type="text/css",
                         "html, body, div, p { font-family: 'Lato', Helvetica, sans-serif; font-weight: 300; }",
                         "h2, h2 { font-family: 'Lato', Helvetica, sans-serif; font-weight: 400; }",
						 "body { margin:20px; }",
						 "h2 { text-align:center; }",
						 "h3 { text-align:center; }",
						 "div { text-align:center; }"
						 )),

  h2("Central Maine Power Live Outage Map"),
  htmlOutput('ts'),
  plotOutput(outputId = "cmpPlot", height="650px"),
  dataTableOutput('details'),
  HTML("<hr noshade size=1><center>Made by <a href='http://twitter.com/hrbrmstr'>@hrbrmstr</a>; Source at: <a href='https://gist.github.com/hrbrmstr/7681842'>github</a></center>")

))