ggplot_horizon: Plot a time series as a horizon plot
In ggTimeSeries: Time Series Visualisations Using the Grammar of Graphics

Description Usage Arguments Value Cosmetic Tips Also See Examples

A horizon plot breaks the Y dimension down using colours. This is useful when visualising y values spanning a vast range and / or trying to highlight outliers without losing context of the rest of the data. Horizon plots are best viewed in an apsect ratio of very low vertical length.

1 2	ggplot_horizon(dtData, cXColumnName, cYColumnName, bandwidth = NULL, vcGroupingColumnNames = NULL)

`dtData`	Data set which may include other columns apart from date and values.
`cXColumnName`	Column name of dates.
`cYColumnName`	Column name of values.
`bandwidth`	the width of one band of Y values. easier to differentiate between the bands.
`vcGroupingColumnNames`	The set of columns which together define the group for the chart to operate within If you plan to facet your plot, you should specify the same column names to this argument.

Returns a gpplot friendly object which means the user can use ggplot scales, etc. to modify the look.

The minimalist look can be achieved by appending the following chunk of code to the example output object: + xlab(NULL) + ylab(NULL) + scale_fill_continuous(low = 'green', high = 'red') + theme( axis.text = element_blank(), axis.ticks = element_blank(), legend.position = 'none', strip.background = element_blank(), # strip.text = element_blank(), # useful if only one year of data plot.background = element_blank(), panel.border = element_blank(), panel.background = element_blank(), panel.grid = element_blank(), panel.border = element_blank() ) + coord_fixed( 0.5 * diff(range(dfData$x)) / diff(range(dfData$y)))

stat_horizon, a less polished but more flexible alternative.

{
library(ggplot2)
set.seed(1)
dfData = data.frame(x = 1:1000, y = cumsum(rnorm(1000)))
p1 = ggplot_horizon(dfData, 'x', 'y')
p1
# add new geoms or colours
p1 +
geom_text(label = '!!!') +
scale_colour_continuous(low = 'red', high = 'green')
}