vistime 1.2.1

Bugfixes

optimize_y = TRUE did not work correctly for ranges that occur during other ranges (issue #22)

Updated documentation
Internals:
- Using the assertive.types package instead of assertthat for nicer error messages
- Upgraded to testthat 3.0 for unit tests
- Bugfixes for hc_vistime() arguments

New function hc_vistime(): Create an interactive timeline rendered by the great Highcharter.js library

gg_vistime():
- Use geom_text() for labels
- Avoid overlapping of event labels using ggrepel::geom_text_repel()
- Layout adjustments: Panel border and changes under-the-hood
vistime():
- Changes under the hood (vertical and horizontal lines)
- Panel border
Usage of package assertthat and re-organization of dependencies

vistime() no longer uses cumbersome Plotly-subplots. Everything renders in the same plot and can be zoomed seamlessly.
Events are drawn from top to bottom (not from bottom to top) - always in the order of the input data frame (per groups that are arranged from top to bottom). This makes the result more intuitive: ¯—-_-_ instead of _-_-—¯

gg_vistime() as new function to output the timeline as a static ggplot (in addition to vistime(), which outputs an interactive Plotly object).
vistime_data() as new function to output the cleaned and optimized timeline data for your own plotting experiments.

arguments showLabels and lineInterval have long been deprecated and have now been removed (use show_labels and background_lines instead).

Fixed bug for plots having more than 9 groups - in these cases the order was not the same as in the input data frame
New argument optimize_y (default: TRUE)
- If optimize_y = TRUE, use heuristic to optimally distribute events on y axis
- If optimize_y = FALSE, use fixed order on y axis according to input data
Relaxed package dependencies: (e.g. plotly only Imports, not Depends)

Hotfix: due to new Plotly version, colors and fontcolors handling was broken. Changed dependency to Plotly > 4.0.0.

Internals (no exporting of helper functions, unit tests using testthat package, continuous integration using travis, test code coverage using covr)
Activated Github Page: https://shosaco.github.io/vistime/
Argument showLabels has been renamed to show_labels for consistency. A deprecation message is shown.

We have a vignette now
Events and ranges that are in the same group are now plotted directly below each other (in the past, all ranges were plotted first, followed by all events). Groups are sorted in order of first appearance but all items of one group are plotted together.
Argument lineInterval is now deprecated. It was replaced by the new, more intuitive argument background_lines - the number of lines to draw in the background.
Remove leading and trailing whitespaces of events and groups before drawing

Hotfix for broken y-axis labeling (introduced through new plotly package 4.8.0.)
Events are now shown as circles (was: squares)
Corrected font colors of Presidents example on help page

Added a new argument showLabels to choose whether or not the event labels shall be drawn - improves layout of dense timelines
New argument lineInterval: the distance in seconds that vertical lines shall be drawn (to reduce plot size and increase performance). When omitted, a heuristic (as before) is used.
Improved heuristic of vertical line drawing

Line width calculation for ranges improved (thicker lines if less events happening simultaneously)
New parameter: linewidth to override the calculated line width for events
Layout and labeling improvements
Simplified examples
Improved error checking

New parameters:
- title (a title for the timeline)
- tooltips (column name of data that contains individual tooltips)
- fontcolors (column name of data that contains color of the event font)
Ordering of groups in plot is now the same as the order of “groups” column in data
Added more complex example and removed school data/example
Changed colors argument default to “color” (i.e. if a column color is present in your data, it will be used for coloring the events)
Bugfix if data contains only one event
Bugfix where events where not correctly categorized into their respective groups
Improved error checking
Improved drawing of vertical lines for certain ranges
Major improvement of intelligent levelling of ranges (_-_¯-—)

First public release on 29/01/2017