Plot legend for graduated size lines maps.
legendGradLines(
pos = "topleft",
title.txt = "Title of the legend",
title.cex = 0.8,
cex = 1,
values.cex = 0.6,
breaks,
lwd,
col,
values.rnd = 2,
frame = FALSE
)Arguments
- pos
position of the legend, one of "topleft", "top", "topright", "right", "bottomright", "bottom", "bottomleft", "bottomleftextra", "left" or a vector of two coordinates in map units (c(x, y)).
- title.txt
title of the legend.
- title.cex
size of the legend title.
- cex
size of the legend. 2 means two times bigger.
- values.cex
size of the values in the legend.
- breaks
break points in sorted order to indicate the intervals for assigning the width of the lines
- lwd
a vector giving the width of the lines.
- col
color of symbols.
- values.rnd
number of decimal places of the values in the legend.
- frame
whether to add a frame to the legend (TRUE) or not (FALSE).
Examples
library(sf)
mtq <- st_read(system.file("gpkg/mtq.gpkg", package="cartography"))
#> Reading layer `mtq' from data source
#> `/tmp/RtmpmpfIrO/temp_libpath18ee15f22a9e/cartography/gpkg/mtq.gpkg'
#> using driver `GPKG'
#> Simple feature collection with 34 features and 7 fields
#> Geometry type: MULTIPOLYGON
#> Dimension: XY
#> Bounding box: xmin: 690574 ymin: 1592536 xmax: 735940.2 ymax: 1645660
#> Projected CRS: WGS 84 / UTM zone 20N
plot(st_geometry(mtq))
box()
legendGradLines(title.txt = "Title of the legend",
pos = "topright",
title.cex = 0.8,
values.cex = 0.6, breaks = c(1,2,3,4,10.2,15.2),
lwd = c(0.2,2,4,5,10),
col ="blue", values.rnd =2)
