## ----include = FALSE----------------------------------------------------------
knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>"
)

## ----setup, echo=TRUE,message=FALSE-------------------------------------------
library(tectonicr)
library(ggplot2) # load ggplot library
library(sf)

## ----nuvel_eq, echo=TRUE------------------------------------------------------
data("nuvel1")
nuvel1.eu <- equivalent_rotation(nuvel1, fixed = "eu")
head(nuvel1.eu)

## ----pb2002_eq, echo=TRUE-----------------------------------------------------
data("pb2002")
pb2002.eu <- equivalent_rotation(pb2002, fixed = "eu")
head(pb2002.eu)

## ----nuvel_euin, echo=TRUE----------------------------------------------------
por <-
  subset(nuvel1.eu, nuvel1$plate.rot == "in") # India relative to Eurasia

## ----small_circles_around_ep, eval=FALSE, include=TRUE------------------------
#  por.sm <- eulerpole_smallcircles(por)
#  data("plates") # load plate boundary data set
#  # world <- rnaturalearth::ne_countries(scale = "small", returnclass = "sf")
#  
#  ggplot() +
#    # geom_sf(data = world, alpha = .5) +
#    geom_sf(
#      data = plates,
#      color = "red",
#      alpha = .5
#    ) +
#    labs(title = "India relative to Eurasia", subtitle = "source: NUVEL1") +
#    geom_sf(
#      data = por.sm,
#      aes(lty = "small circles"),
#      color = "darkblue", fill = NA,
#      alpha = .5
#    ) +
#    geom_point(
#      data = por,
#      aes(lon, lat),
#      shape = 21,
#      colour = "lightblue",
#      size = 2,
#      fill = "darkblue",
#      stroke = 1
#    ) +
#    geom_point(
#      data = euler,
#      aes(lon + 180, -lat),
#      shape = 21,
#      colour = "lightblue",
#      size = 2,
#      fill = "darkblue",
#      stroke = 1
#    ) +
#    coord_sf(default_crs = "WGS84", crs = sf::st_crs("ESRI:54030"))

## ----great_circles_around_ep, eval=FALSE, include=TRUE------------------------
#  por.gm <- eulerpole_greatcircles(por)
#  
#  ggplot() +
#    # geom_sf(data = world, alpha = .5) +
#    geom_sf(
#      data = plates,
#      color = "red",
#      alpha = .5
#    ) +
#    labs(title = "India relative to Eurasia", subtitle = "source: NUVEL1") +
#    geom_sf(
#      data = por.sm,
#      aes(lty = "small circles"),
#      color = "darkblue",
#      alpha = .5
#    ) +
#    geom_sf(
#      data = por.gm,
#      aes(lty = "great circles"),
#      color = "darkblue"
#    ) +
#    geom_point(
#      data = por,
#      aes(lon, lat),
#      shape = 21,
#      colour = "lightblue",
#      size = 2,
#      fill = "darkblue",
#      stroke = 1
#    ) +
#    geom_point(
#      data = por,
#      aes(lon + 180, -lat),
#      shape = 21,
#      colour = "lightblue",
#      size = 2,
#      fill = "darkblue",
#      stroke = 1
#    ) +
#    coord_sf(default_crs = "WGS84", crs = sf::st_crs("ESRI:54030"))

## ----loxodromes, eval=FALSE, include=TRUE-------------------------------------
#  por.ld <- eulerpole_loxodromes(x = por, angle = 45, n = 10, cw = TRUE)
#  
#  ggplot() +
#    labs(title = "India relative to Eurasia", subtitle = "source: NUVEL1") +
#    # geom_sf(data = world, alpha = .5) +
#    geom_sf(
#      data = plates,
#      color = "red",
#      alpha = .5
#    ) +
#    geom_sf(
#      data = por.sm,
#      aes(lty = "small circles"),
#      color = "darkblue",
#      alpha = .5
#    ) +
#    geom_sf(
#      data = por.ld,
#      aes(lty = "clockwise loxodromes"),
#      color = "darkblue"
#    ) +
#    geom_point(
#      data = por,
#      aes(lon, lat),
#      shape = 21,
#      colour = "lightblue",
#      size = 2,
#      fill = "darkblue",
#      stroke = 1
#    ) +
#    geom_point(
#      data = por,
#      aes(lon + 180, -lat),
#      shape = 21,
#      colour = "lightblue",
#      size = 2,
#      fill = "darkblue",
#      stroke = 1
#    ) +
#    coord_sf(default_crs = "WGS84", crs = sf::st_crs("ESRI:54030"))