ol_scale_iconsize_discrete | R Documentation |
Specify a discrete size mapping for an icon layer.
ol_scale_iconsize_discrete(size.vector = NULL, name = NULL, na.size.val = 0.33, legend.breaks = NULL, display = FALSE, display.icon.img.src = NULL)
size.vector |
numeric named vector of the form
|
name |
character the scale name. |
na.size.val |
numeric the size scalar assigned to non-numeric or NA values. |
legend.breaks |
numeric ordered vector of variable values to display in the legend. |
display |
logical indicating whether to draw the scale for output
in the HTML. If |
display.icon.img.src |
character path to image file to use in size legend. If NULL, the first image supplied to the icon layer will be used. |
This method maps OpenLayers point (icon) feature sizes 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 "iconsize" mapping to a numeric, character, or factor variable. If no such layer exists, attempts to add this type of scale will result in a warning.
Size inputs to this method are applied as scalars to the icon widths.
A size value of 1 translates to the target.icon.width
assigned
to the layer.
list of class Scale.IconSize.Discrete
.
ol_map
,
ol_geom_icon
,
some.r.servers <- matrix( c( 144.964,-37.798, -122.920,49.278, 121.494,31.307, 25.083,35.307, -21.930,64.149, 11.877,45.407, -99.200,19.345, 5.322,60.388, -8.224,39.400, -8.616,41.147, -73.953,40.768, 20.304,63.821, 8.548,47.376, 33.031,35.247, -78.938,36.001, -123.279,44.564, -96.797,32.777 ), byrow=TRUE, ncol=2 ) r.server.df <- data.frame( server.name=c( 'School of Mathematics and Statistics, University of Melbourne', 'Simon Fraser University, Burnaby', 'Shanghai University', 'University of Crete', 'Marine Research Institute', 'University of Padua', 'Instituto Tecnologico Autonomo de Mexico', 'University of Bergen', 'RadicalDevelop, Lda', 'University of Porto', 'Four Dots', 'Academic Computer Club, UmeƄ University', 'ETH Zurich', 'Middle East Technical University Northern Cyprus Campus, Mersin', 'Duke University, Durham, NC', 'Oregon State University', 'Revolution Analytics, Dallas, TX' ), server.type = sample(c("A","B","C"),17,replace=TRUE), stringsAsFactors=FALSE ) r.icon <- "https://www.r-project.org/Rlogo.png" ## If width is not provided image must be local ## and png package must be installed. r.icon.width <- 200 r.map <- ol_map( center=c(-100,30), zoom=3 ) + streetmap()+ ol_geom_icon( some.r.servers, r.icon, mapping=ol_aes(iconsize=server.type), df = r.server.df, name="R Servers", icon.size.scalar='autoscale', src.img.width=r.icon.width, toggle.control=TRUE, tooltip=r.server.df$server.type ) + ol_scale_iconsize_discrete( display=TRUE ) ## Not run: # Oave as HTML and open in browser ol_map2HTML( r.map, 'R-servers.html' ) browseURL("R-servers.html") ## End(Not run)
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