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---
output: rmarkdown::github_document
editor_options:
chunk_output_type: console
---
# terminator
Compute Global Terminator (Day/Night) Bands
## Description
Compute global terminator (day/night) bands which can be overlayed as day and night regions on a ggplot2 world map.
## What's Inside The Tin
The following functions are implemented:
- `terminator`: Compute a single termiantor band
- `terminator_lat_lon`: Generate a full set of terminator frames
## Installation
```{r eval=FALSE}
devtools::install_github("hrbrmstr/terminator")
```
```{r message=FALSE, warning=FALSE, error=FALSE, include=FALSE}
options(width=120)
```
## Usage
```{r message=FALSE, warning=FALSE, error=FALSE, eval=TRUE}
library(terminator)
library(ggplot2)
library(gganimate) # devtools::install_github("dgrtwo/gganimate")
# current verison
packageVersion("terminator")
term_seq <- terminator_lat_lon()
chart <- ggplot(term_seq, aes(frame = frame)) +
borders("world", colour = "gray90", fill = "gray85") +
geom_ribbon(aes(lat, ymax = lon), ymin = 90, alpha = 0.2) +
coord_equal(xlim = c(-180, 190), ylim = c(-58, 85), expand = 0) +
ggthemes::theme_map()
gganimate(
chart,
interval = 0.1, ani.width=1000, ani.height=600,
filename = "terminator-animation.gif"
)
```
