ol_scale_lty_discrete | R Documentation |
Specify a discrete line type mapping scale.
ol_scale_lty_discrete(lty.list = NULL, name = NULL, na.lty.val = NA, ordered.values = NULL, opacity = 1, draw.color = "black", draw.lwd = 1, display = FALSE)
lty.list |
numeric named list of the form
|
name |
character the scale name. |
na.lty.val |
numeric the |
ordered.values |
character, numeric, or factor vector containing the
ordered unique discrete variable values. This input is used to determine
the order of the values appearing in the legend. If not supplied, the
order is taken from |
opacity |
numeric in [0,1]. The line opacity used in the legend only. |
draw.color |
character color used in the legend lines only. |
draw.lwd |
numeric indicating the line width for the legend
only. This will be passed to an R plot command. See |
display |
logical indicating whether to draw the scale for output
in the HTML. If |
This method maps OpenLayers feature line dash types to discrete
variable values. This scale can be added to an Ol.Map S3 object
only if the Ol.Map object has a layer with a "lty" mapping to a
numeric, character, or factor type variable. If no such layer
exists, attempts to add this type of scale will result in a warning.
The lty.list
input enables the user to specify the exact
mapping, assigning line dash types to specific variable values. The
lty
aesthetic does not have a continuous scale.
Note: this method does not result in consistant rendering for different browsers or map zoom levels.
list of class Scale.Lwd.Discrete
.
ol_map
,
ol_geom_polygon
,
ol_geom_line
line.matrix1 <- matrix( c( -80.4,-80.4, 25.78,25.88 ), ncol=2 ) line.matrix2 <- matrix( c( -80.25,-80.35, 25.65,25.65 ), ncol=2 ) line.list <- list(line.matrix1,line.matrix2) line.df <- data.frame( direction=c("vertical","horizontal"), no=runif(2) ) miami.gray.basemap <- ol_map( center=c(-80.385790,25.782618), zoom=9 ) + lightgray() line.layer <- ol_geom_line( line.list, mapping=ol_aes( lty=direction # discrete mapping ), df=line.df, name="Miami Lines", toggle.control=TRUE ) line.type.scale <- ol_scale_lty_discrete( lty.list=list( vertical = 1, horizontal = c(5,5) ), name="Direction", display=TRUE ) line.map.miami <- miami.gray.basemap + line.layer + line.type.scale ## Not run: # Output to file and view ol_map2HTML( line.map.miami, 'miami_lines.html', map.heading="Miami Lines" ) browseURL("miami_lines.html") ## End(Not run)
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