[英]Export a Map created with rworldmap in png
我在R上使用rworldmap
包創建了一個地圖,如下所示:
library(rworldmap)
fta.df <- data.frame(country = c("CAN", "MEX", "USA"),
country = c(1,2,3))
MyMap <- joinCountryData2Map(fta.df, joinCode = "ISO3",
nameJoinColumn = "country")
MyMap <- subset(MyMap, continent != "Antarctica")
FTA_map <- mapCountryData(MyMap, nameColumnToPlot="country",
catMethod = "categorical",
missingCountryCol = gray(.8),
colourPalette=c("forestgreen","royalblue1", "red3"),
mapTitle = "",
addLegend = FALSE)
FTA_map$legendText <- c("CAN", "MEX", "USA")
do.call( addMapLegendBoxes, c(FTA_map,x="bottomleft",title = "title",horiz=FALSE))
我對結果滿意,但是不知道如何導出在.png中獲得的圖像。
任何想法?
png("map.png",width=800,height=800,units="px")
MyMap <- subset(MyMap, continent != "Antarctica")
FTA_map <- mapCountryData(MyMap, nameColumnToPlot="country",
catMethod = "categorical",
missingCountryCol = gray(.8),
colourPalette=c("forestgreen","royalblue1", "red3"),
mapTitle = "",
addLegend = FALSE)
FTA_map$legendText <- c("CAN", "MEX", "USA")
do.call( addMapLegendBoxes, c(FTA_map,x="bottomleft",title = "title",horiz=FALSE))
dev.off()
看看這個:
https://www.rdocumentation.org/packages/grDevices/versions/3.4.1/topics/png
您可以通過控制png()
函數的參數來實現分辨率
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