GeomTimeline: Defines Our GeomTimeline class

In dannyjwpark/NOAA: NOAA Earthquakes

Description

As per the course materials: The ggproto() function is used to construct a new class corresponding to your new geom. The geom_* function is constructed as a regular function. Build a geom for ggplot2 called geom_timeline() for plotting a time line of earthquakes ranging from xmin to xmaxdates with a point for each earthquake. Optional aesthetics include color, size, and alpha (for transparency). The xaesthetic is a date and an optional 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). This geom looks to chart a timeline of earthquakes for a given country / countries with points (in the example) representing earthquake events, point size indicating earthquake magnitude and colour representing number of deaths. x (the date) is a required aesthetic whereas y (country) is optional.

Usage

GeomTimeline

Format

An object of class GeomTimeline (inherits from Geom, ggproto, gg) of length 5.

Examples

## Not run: 
 df <- df_earthquakes %>% filter(COUNTRY %in% c("CHINA", "USA"), YEAR > 2000)
 ggplot(df, aes(x = date, y = COUNTRY,
                color = as.numeric(TOTAL_DEATHS),
                size = as.numeric(EQ_PRIMARY),
                label = CLEAN_LOCATION_NAME)) +
   geom_timeline() +
   labs(size = "Richter scale value", color = "# deaths") +
   ggplot2::theme(panel.background = ggplot2::element_blank(),
         legend.position = "bottom",
         axis.title.y = ggplot2::element_blank()) +
   ggplot2::xlab("DATE")

## End(Not run)

dannyjwpark/NOAA documentation built on Dec. 31, 2020, 11:11 p.m.