TextOnStaticMap: plots text on map

In iNZightVIT/RgoogleMaps: Overlays on Google map tiles in R

Description

TextOnStaticMap draws the strings given in the vector labels at the coordinates given by x and y on a map. y may be missing since xy.coords(x,y) is used for construction of the coordinates.

Usage

TextOnStaticMap(MyMap, lat, lon, labels = seq_along(lat), TrueProj = TRUE, 


    FUN = text, add = FALSE, verbose = 0, ...)

Arguments

MyMap	map image returned from e.g. GetMap()
lat	latitude where to put text.
lon	longitude where to put text.
labels	a character vector or expression specifying the text to be written. An attempt is made to coerce other language objects (names and calls) to expressions, and vectors and other classed objects to character vectors by as.character. If labels is longer than x and y, the coordinates are recycled to the length of labels.
TrueProj	set to FALSE if you are willing to accept some degree of inaccuracy in the mapping. In that case, the coordinates of the image are in lat/lon and the user can simply overly points/lines/axis without worrying about projections
FUN	overlay function, typical choice would be text
add	start a new plot or add to an existing
verbose	level of verbosity
...	further arguments to be passed to FUN

Value

return value of FUN

Author(s)

Markus Loecher

Examples

lat = c(40.702147,40.718217,40.711614);


 lon = c(-74.012318,-74.015794,-73.998284);


 center = c(mean(lat), mean(lon));


 zoom <- min(MaxZoom(range(lat), range(lon)));


 





MyMap <- GetMap(center=center, zoom=zoom,markers = paste0("&markers=color:blue|label:S|",


         "40.702147,-74.015794&markers=color:green|label:G|40.711614,-74.012318&markers=",


          "color:red|color:red|label:C|40.718217,-73.998284"), destfile = "MyTile1.png");


 TextOnStaticMap(MyMap, lat=40.711614,lon=-74.012318, "Some Text", cex=2, col = 'red')


 

iNZightVIT/RgoogleMaps documentation built on May 17, 2019, 10:09 p.m.