How are Geom polygons similar to a path?
geom_polygon.Rd. Polygons are very similar to paths (as drawn by geom_path () ) except that the start and end points are connected and the inside is coloured by fill. The group aesthetic determines which cases are connected together into a polygon.
How to group polygons in a Geom plot?
A geom that draws a polygon. group – (default: interaction of all categorical variables in the plot) how to group observations into polygons (each observation represents one point of a polygon) The following example shows how a data frame can define multiple polygons (in this example, two polygons).
Is it possible to draw polygons with holes?
The group aesthetic determines which cases are connected together into a polygon. From R 3.6 and onwards it is possible to draw polygons with holes by providing a subgroup aesthetic that differentiates the outer ring points from those describing holes in the polygon.
How to adjust the position of a polygon?
Position adjustment, either as a string, or the result of a call to a position adjustment function. Either “evenodd” or “winding”. If polygons with holes are being drawn (using the subgroup aesthetic) this argument defines how the hole coordinates are interpreted.
Do you need two data frames for geom polygon?
Learn more about setting these aesthetics in vignette (“ggplot2-specs”). # When using geom_polygon, you will typically need two data frames: # one contains the coordinates of each polygon (positions), and the # other the values associated with each polygon (values).
How to create a polygon layer in OpenLayers?
Function to create a polygon layer to add to an OpenLayers Map object. SpatialPolygonsDataFrame, SpatialPolygons, list of polygon-like objects, or a two-column matrix of longitude-latitude coordinates to be used as ordered polygon vertices. list created by ol_aes.