oceanmap (version 0.1.6)

ggplotmaply: Converts a ggplot2 object from ggplotmap() to plotly

Description

This function converts a ggplot2 object created by oceanmap::ggplotmap() to a plotly object.

Usage

ggplotmaply(ggobj, fixedrange=F, grid=F,expand=3)

Arguments

ggobj

Character string identifying regions predefined by the region_definitions-dataset, Raster* or Extent object (corresponds to v_area of the v-function). If missing, region is derived from geographical coordinates, denoted by lat and lon. See add.region to define new region definitions and delete.region to delete unproper region definitions.

fixedrange

Vector returning longitude coordinates of the area to be plotted.

grid

whether a grid should be plotted (default is TRUE)

expand

By default, the underlying ggplotly-function does not stick to the plotting region of the ggobj, but extends it. This can result in missing countries or islands. The expand-argument extends the plotly-plotting window in each direction in order to cover the corresponding landmasks.)

Author

Robert K. Bauer

Details

ggoplotmaply uses the ggplotly functions to convert the ggplot object into the plotly format.

See Also

ggplotmap, ggplotly

Examples

library(ggplot2)

#### Example 1: plot landmask of the Western Mediterranean Sea
## a) by using longitude and latitude coordinates:
# lon <- c(-6, 16.5)
# lat <- c(34, 44.5)
# ggobj <- ggplotmap(xlim=lon, ylim=lat)
# ggobj
# ggplotmaply(ggobj,expand = 10) ## we need to expand the plotting region


## b) plot landmask of the Western Mediterranean Sea by using an extent-object:
# library('raster')
# ext <- extent(lon, lat)
# plotmap(ext, main="Western Mediterranean Sea") # extent-object
# ggobj <- ggplotmap(ext)
# ggobj
# ggplotmaply(ggobj)


## c) plot landmask of the Western Mediterranean Sea by using a raster-object:
# r <- raster(ext)
# ggobj <- ggplotmap(r)
# ggobj
# ggplotmaply(ggobj)
# ggplotmaply(ggobj)

## d) plot landmask of the entire Mediterranean Sea by using keyword:
 ggobj <- ggplotmap("med4") + 
          geom_point(data=data.frame(x=3.7008, y=43.4079),aes(x,y),size=5,colour="blue")
# ggobj
# ggplotmaply(ggobj,expand = 10)


## e) add landmask to raster image plot (similar to v()-call)
# library(dplyr)
# library(ggplot2)
# data(cmap)
# setwd(system.file("test_files", package="oceanmap"))
# nc <- nc2raster(ncfiles[1])
# rs2df <- nc[[1]] %>% ## take first layer
#          rasterToPoints() %>% ## convert raster to xyz matrix
#          as.data.frame() ## convert to data frame
# names(rs2df) <- c("Lon","Lat","Conc") ## reset names (important for ggplotmaply hover text)
# ggobj <- ggplot() + geom_raster(data = rs2df, aes(x=Lon,y=Lat,fill=Conc)) 
# ggobj_with_land_mask <- ggplotmap(add_to = ggobj) + 
#                         scale_fill_gradientn(colours=cmap$jet) # change colorbar
# ggobj_with_land_mask 
# ggplotmaply(ggobj_with_land_mask)