Union of circles and polygons in a flyer

Question

I add two circles and a polygon to the map flyer. Here is my code that describes these three forms. Is there a way to get the union of these three shapes?

leaflet(options = leafletOptions(minZoom = 0, maxZoom = 18))
m <- leaflet()%>%
  addTiles()%>%
  setView(72.84320,20.43397,zoom=16)%>%
  #Add mouse position
  addMouseCoordinates(style = "basic", epsg = NULL,
                      proj4string = NULL, native.crs = FALSE)

#Runway Extremities
ARP <- c((72 +(50/60)+(32.67/3600)),(20+(26/60)+(1.54/3600)))
ptTop2 <- c((72 +(50/60)+(16.98/3600)),(20+(25/60)+(25.18/3600)))
ptBottom2 <- c((72 +(50/60)+(43.45/3600)),(20+(26/60)+(18.13/3600)))
ptTop1 <- c((72 +(50/60)+(8.64/3600)),(20+(26/60)+(8.08/3600)))
ptBottom1 <- c((72 +(50/60)+(44.21/3600)),(20+(26/60)+(5.63/3600)))
ap1 <- 95
ap2 <- 26

pt1 <- destPoint(ptTop1,ap1+90,4000)
pt2 <- destPoint(ptTop1,ap1-90,4000)
pt3 <- destPoint(ptBottom1,ap1-90,4000)
pt4 <- destPoint(ptBottom1,ap1+90,4000)
iRect <- data.frame(rbind(pt1,pt2,pt3,pt4))

#Inner Horizontal Surface
m%>%addCircles(ptBottom1[1],ptBottom1[2],radius = 4000,color = "red",
                    fillOpacity = 0,weight = 3)%>%
  addCircles(ptTop1[1],ptTop1[2],radius = 4000,color = "red",
             fillOpacity = 0,weight = 3)%>%
  addPolygons(iRect$lon,iRect$lat,color = "blue",
              fillOpacity = 0, weight=3)

rgeoshas a function gUnion(), but I'm not sure how to convert the circles that were added by the above code to SpatialPolygons.

Answer 1

I would recommend abandoning features from the package spand instead look at the simple objects in the sfpackage .

Simple functions are the “new” space class for R (and made by the same guy who did sp).

So, to get your circles united, you can use

library(rgeos)
library(sf)


## A dataframe of your points
df <- data.frame(lon = c(ptTop1[1], ptTop2[1], ptBottom1[1], ptBottom2[1]),
                 lat = c(ptTop1[2], ptTop2[2], ptBottom1[2], ptBottom2[2]))

## convert them into a simple features data.frame
sf_df <- st_as_sf(df, coords = c("lon", "lat"))

## convert into circles
sf_circles <- st_buffer(sf_df, dist = 0.04)

## find the union of all the circles
sf_combined <- st_union(sf_circles)


## now sf_combined is a single polygon
sf_combined
# Geometry set for 1 feature 
# geometry type:  POLYGON
# dimension:      XY
# bbox:           xmin: 72.79573 ymin: 20.38366 xmax: 72.88561 ymax: 20.47837
# epsg (SRID):    NA
# proj4string:    NA
# POLYGON((72.8745460445306 20.4072956786729, 72....

, sf ( MULTIPOINT),

library(leaflet)

sp <- as(sf_combined, 'Spatial')

sf_combined %>%
    leaflet() %>%
    addTiles() %>%
    addPolygons()

Answer 2

, . , - , :

• , / ( , )

-, , SpatialPolygon , sp- :

require(sp)
require(leaflet)

#Used for sp polygon creation
createPolygon <- function(latitude, longitude, name = "polygon"){

  return(Polygons(list(Polygon(cbind(longitude, latitude))), ID = name))

}

#Will give "res" points coordinates for a circle centered on x0 y0
#with a radius r
CreateCircle <- function(x0, y0, r, res = 50){

  theta = seq(0, 2*pi, length.out = res+1)

  x = r*cos(theta) + x0
  y = r*sin(theta) + y0

  return(data.frame(x, y))

}

#Computes two circles points'
circleA <- CreateCircle (0, 0, 2, res = 200)
circleB <- CreateCircle (10, 10, 4, res = 6)

#Add them to polygons
A = createPolygon(circleA$x, circleA$y, "A")
B = createPolygon(circleB$x, circleB$y, "B")
C = SpatialPolygons(list(A, B))

#Create and display the leaflet map
m = leaflet() %>% addTiles() %>%
  addPolygons(data = C, fillColor = topo.colors(10, alpha = NULL), stroke = TRUE)
m

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