geom_timeline: Earthquake timeline plot

In davidbody/earthquakes-package: Earthquakes Package for Mastering Software Development in R Capstone

Description

The timeline geom plots a time line of earthquakes with a point for each earthquake. The x aesthetic is a date and the y aesthetic is a factor indicating some stratification in which case multiple time lines will be plotted for each level of the factor (e.g. country). Optional aesthetics include color, size, and alpha.

Usage

geom_timeline(mapping = NULL, data = NULL, stat = "identity",
  position = "identity", na.rm = FALSE, show.legend = NA,
  inherit.aes = TRUE, ...)

Arguments

mapping	Set of aesthetic mappings created by aes or aes_. If specified and inherit.aes = TRUE (the default), it is combined with the default mapping at the top level of the plot. You must supply mapping if there is no plot mapping.
data	The earthquake data to be plotted. See the example for details.
stat	The statistical transformation to use on the data for this layer, as a string.
position	Position adjustment, either as a string, or the result of a call to a position adjustment function.
na.rm	If FALSE, the default, missing values are removed with a warning. If TRUE, missing values are silently removed.
show.legend	logical. Should this layer be included in the legends? NA, the default, includes if any aesthetics are mapped. FALSE never includes, and TRUE always includes.
inherit.aes	If FALSE, overrides the default aesthetics, rather than combining with them. This is most useful for helper functions that define both data and aesthetics and shouldn't inherit behaviour from the default plot specification, e.g. borders.
...	other arguments passed on to layer. These are often aesthetics, used to set an aesthetic to a fixed value, like color = "red" or size = 3. They may also be parameters to the paired geom/stat.

Aesthetics

geom_timeline understands the following aesthetics (required aesthetics are in bold):

• x

• y

• color

• size

• alpha

Note

See geom_timeline_label for additional examples.

Examples

## Not run: 
# You can plot a basic earthquake timeline as follows:

library(dplyr)

recent_earthquakes <- clean_earthquakes %>%
    filter(COUNTRY == "CHINA", DATE >= ymd('2000-01-01'))

g <- ggplot(recent_earthquakes,
            aes(x = DATE, y = COUNTRY, size = EQ_PRIMARY, color = TOTAL_DEATHS))
g <- g + geom_timeline(alpha = 0.5)
g <- g + theme_classic()
g <- g + theme(legend.position = "bottom",
               axis.line.y = element_blank(),
               axis.ticks.y = element_blank(),
               axis.title.y = element_blank(),
               axis.text.y = element_blank())
g <- g + guides(color = guide_colorbar(title = "# deaths"),
                size = guide_legend("Richter scale value"))
g

## End(Not run)

davidbody/earthquakes-package documentation built on May 14, 2019, 10:37 p.m.