- Fixed some incorrect documentation of internal functions.
- Corrected an url for eulerAPE.

- It is now possible to set the loss function to be used when trying to optimize the Euler diagram layout via
`loss`

and`loss_aggregator`

. There is a new vignette that showcases this new feature.

- C++14 is now required for the package.

- Label repelling via
`adjust_labels`

in`plot.euler()`

has been deprecated and removed to fix sanitizer warnings.

- citation to conference paper added to
`inst/CITATION`

- error messages for erroneous input have been improved in several places
- switched
`PI`

to`M_PI`

to support`STRICT_R_HEADERS`

in C++ code (##82, thanks @eddelbuettel)

- error in documentation for list method has been fixed, thanks @gprezza (##77)

- Label repelling (activated by calling
`euler()`

with`adjust_labels = TRUE`

) no longer repels text labels away from the edges of the shapes in the diagram.

- Rectify sanitizer error from clang-ASAN test environment.

- Set
`stringsAsFactors = TRUE`

inside all relevant functions in`euler()`

to avoid errors in upcoming R version. - Fix broken link in
*eulerr under the hood*vignette.

- Throw an error message when the number of sets in
`venn()`

exceeds 5 (##65) - Performance improved when large lists are used as input to
`euler()`

and`venn()`

(##64, @privefl)

- Correctly handle
`data.frame`

inputs to`euler()`

when categorical variables are character vectors and not factors.

- In
`plot.euler()`

, percentages can be added to the plot in addition to or instead of counts by providing a`list`

to the`quantities`

argument with an item`type`

that can take any combination of`counts`

and`percent`

. This change also comes with a redesign of the grid graphics implementation for labels. `eulerr_options()`

gains a new argument`padding`

which controls the amount of padding between labels and quantities. (##48)`plot.euler()`

now uses code from the**ggrepel**package to prevent labels from overlapping or escaping the plot area if`adjust_labels`

is set to`TRUE`

.- A new vignette featuring a gallery of plots from the package has been added.

- The default
`cex`

for quantity labels has changed from 1.0 to 0.9. - Labels for sets that overlap are now merged (partly fixes ##45)
- The fill colors for sets which are completely contained within another set are now once again composed of a mix of the color of the subset and the superset.
- Plotting data has been exposed in a
`data`

slot in the object created by calling to`plot.euler()`

(##57)

- An error in layout normalization that occurred sometimes with ellipses has been fixed.

`venn()`

is a new function that produces Venn diagrams for up to 5 sets. The interface is almost identical to`euler()`

except that a single integer can also be provided. A new vignette,*Venn diagrams with eulerr*, exemplifies its use.

- Calculations for the strips in
`plot.euler()`

when a list of Euler diagrams is given has been improved. Setting`fontsize`

or`cex`

now results in appropriately sized strips as one would expect. - Tiny overlaps (where the fraction of the area is less than one thousandth of the largest overlap) in the final diagram are no longer plotted.
`eulergram()`

objects from`plot.euler()`

now have a proper grob name for the canvas grob, so that extracting information from them is easier.

- Return value documentation for
`euler()`

now correctly says “ellipses” and not “coefficients”. `data.frame`

or`matrix`

inputs now work properly when values are numerical. (##42)- Fixed some spelling errors in news and vignettes.

`error_plot()`

is a new function that offers diagnostic plots of fits from`euler()`

, letting the user visualize the error in the resulting Euler diagram.

`euler()`

once again uses the residual sums of squares, rather than the stress metric, as optimization objective, which means that output is always scaled appropriately to input (##28).`plot.euler()`

now uses the polylabelr package to position labels for the overlaps of the ellipses, which has improved performance in plotting complicated diagrams considerably and reduced the amount of code in this package greatly.- The c++ internals have been rewritten using more memory-efficient, performant and expressive code.

- The
`euler.data.frame()`

method (and by proxy the`euler.matrix()`

method) can now take matrices with factors in addition to the previously supported logical and integer (binary) input. The function will dummy code the variables for the user. - A few performance fixes.
- Additional unit tests.
- Previously deprecated arguments to
`plot.euler()`

have been made defunct. - Added a data set,
`plants`

, to exemplify the list method for`euler()`

. - Added a data set,
`fruits`

, to exemplify the data.frame method for`euler()`

. `euler.data.frame()`

gains an argument`sep`

, which is a character vector used to separate dummy-coded factors if there are factors or characters in the input.- Added a data set,
`organisms`

, to exemplify the matrix method for`euler()`

. - Added a data set,
`pain`

, to exemplify the table method for`euler()`

. `euler.table()`

gains an argument,`factor_names`

, for specifying whether the factor names should be included when generating dummy-coded variables in case the input is a data.frame with character or factor vectors or if the input is a table with more than two columns or rows.- Parts of the
*eulerr under the hood*vignette has been branched off into a new vignette regarding visualization.

- Empty combinations can now be provided and will be plotted (generating completely blank plots).
`euler.list()`

now passes its ellipsis argument along properly. (##33, thanks, @banfai)- Several spelling and grammar mistakes were corrected in vignettes and documentation.

`plot.euler()`

now returns a`gTree`

object. All of the plotting mechanisms are now also found in this function and`plot.eulergram()`

and`print.eulergram()`

basically just call`grid::grid.draw()`

on the result of`plot.euler()`

. This change means that functions such as`gridExtra::grid.arrange()`

now work as one would intuit on the objects produced by`plot.euler()`

.- Fitting and plotting Euler diagrams with empty sets is now allowed (##23). Empty sets in the input will be returned as
`NA`

in the resulting`data.frame`

of ellipses. - The last-ditch optimizer has been switched back to
`GenSA::GenSA()`

from`RcppDE::DEoptim()`

.

- The
**grid**parameters available for*edges*are now correctly specified in the manual for`plot.euler()`

. `euler.data.frame()`

now works as expected for tibbles (from the**tibble**package) when argument`by`

is used.

`plot.euler()`

has been rewritten completely from scratch, now using a custom**grid**-based implementation rather than**lattice**. As a result, all`panel.*()`

functions and`label()`

have been deprecated as well as arguments`fill_alpha`

,`auto.key`

,`fontface`

,`par.settings`

,`default.prepanel`

,`default.scales`

, and`panel`

. The method for plotting diagrams has also changed—rather than overlaying shapes on top of each other, the diagram is now split into separate polygons using the**polyclip**package. Instead of relying on semi-transparent fills, the colors of the fills are now blended in the CIELab color space (##16).- The default color palette has been redesigned from scratch to suit the new plot method.
- A new function
`eulerr_options()`

have been provided in order to set default graphical parameters for the diagrams.

- Arguments
`counts`

and`outer_strips`

to`plot.euler()`

are now defunct. `euler()`

now always returns ellipse-based parameters with columns`h`

,`k`

,`a`

,`b`

, and`phi`

, regardless of which shape is used. This item was previously named “coefficients”, but it now called “ellipses” instead and a custom`coef.euler()`

method has been added to make cure that`coef()`

still works.- Layouts are now partially normalized so that diagrams will look approximately the same even with different random seeds.

- Providing custom labels to
`quantities`

and`labels`

arguments of`plot.euler()`

now works correctly (##20).

- The last-ditch optimizer switched from
`GenSA::GenSA()`

to`RcppDE::DEoptim()`

. - The optimizer used in all the remaining cases, including all circular diagrams and initial layouts, was switched back to
`stats::nlm()`

again. - In final optimization, we now use
*stress*instead of residual sums of squares as a target for our optimizer.

`label`

is now a proper generic with an appropriate method (`label.euler()`

).- The
**eulerr under the hood**vignette has received a substantial update.

- Fixed warnings resulting from the deprecated
`counts`

argument in one of the vignettes. - Fixed memcheck errors in the final optimizer.
- Corrected erroneous labeling when
`auto.key = TRUE`

and labels were*not*in alphabetic order. (##15)

- Added the missing %\VignetteEngine{knitr::knitr} to both vignettes. It had mistakenly been left out, which had mangled the resulting vignettes.

- Ellipses are now supported by setting the new argument
`shape = "ellipse"`

in`euler()`

. This functionality accompanies an overhaul of the innards of the function. - Initial optimization function and gradient have been ported to C++.
- The initial optimizer has been switched from
`stats::optim(..., method = "L-BFGS-B")`

to`stats::nlminb()`

. - The final optimizer now falls back to
`GenSA::GenSA()`

when the fit from`nlminb()`

isn’t good enough, by default for 3 sets and ellipses, but this behavior can be controlled via a new argument`control`

. - A packing algorithm has been introduced to arrange disjoint clusters of ellipses/circles.
- The label placement algorithm has been rewritten to handle ellipses and been ported to C++. It now uses numerical optimization, which should provide slightly more accurate locations.
- The initial optimizer now uses an analytical Hessian in addition to gradient.

- The initial optimizer now restarts up to 10 times and picks the best fit (unless it is perfect somewhere along the way).
- The default palette has been changed to a fixed palette, still adapted to color deficiency, but with some manual adjustments to, among other things, avoid unnecessary use of color.
- The names of the
`diagError`

and`regionError`

metrics have been changed from`diag_error`

and`region_error`

to reflect the original names. - The coordinates for the centers are now called
*h*and*k*instead of*x*and*y*, respectively. - A new
`label()`

function has been added to extract locations for the overlaps for third party plotting (##10). - The
`counts`

argument to`plot.euler()`

and`panel.euler.labels()`

have been deprecated in favor of the more appropriate`quantities`

. - Argument
`fill_opacity`

in`plot.euler()`

that was deprecated in v2.0.0 has been made defunct.

`eulerr()`

has been replaced with`euler()`

(see update 1.1.0) and made defunct.- There are two new methods for
`euler`

:`euler.list()`

produces diagrams from a list of sample spaces.`euler.table()`

produces diagrams from a`table`

object, as long as there are no dimensions with values greater than 2.

`plot.euler()`

has been rewritten (again) from the ground up to better match other high-level functions from**lattice**. This change is intended to be as smooth as possible and should not make much of a difference to*most*users.- Arguments
`polygon_args`

,`mar`

, and`text_args`

to`plot.euler()`

have been made defunct.

`plot.euler()`

handles conflicting arguments better.- c++ routines in
`eulerr`

now use registration. `euler()`

now allows single sets (##9).- Labels in
`plot.euler()`

now use a bold font face by default in order to distinguish them from the typeface used for counts. - Argument
`key`

in`plot.euler()`

has been deprecated and replaced with`auto.key`

. Notice that using`key`

does not throw a warning since the argument is used in`lattice::xyplot()`

(which`plot.euler()`

relies on). - Argument
`fill_opacity`

is softly deprecated and has been replaced with`fill_alpha`

for consistency with other lattice functions.

`border`

argument in`plot.euler()`

works again (##7).

`eulerr()`

and its related methods been deprecated and are being replaced by`euler()`

, which takes slightly different input. Notably, the default is now to provide input in the form of disjoint class combinations, rather than unions. This is partly to make the function a drop-in replacement for`venneuler::venneuler`

.`plot.euler()`

has been completely revamped, now interfacing`xyplot()`

from lattice. As a result, arguments`polygon_args`

,`mar`

, and`text_args`

have been deprecated.

- Added a
`counts`

argument to`plot.eulerr`

, which intersections and complements with counts from the original set specification (##6). - Added a
`key`

argument to`plot.eulerr`

that prints a legend next to the diagram. - Switched to
`atan2()`

from RcppArmadillo. - Added version requirement for RcppArmadillo.
- Dropped dependency on MASS for computing label placement, replacing it with a faster, geometric algorithm.
- Dropped the cost function argument
`cost`

and now forces the function to use sums of squares, which is more or less equivalent to the cost function from`venneuler`

. - Color palettes in
`plot.euler()`

now chooses colors adapted to color vision deficiency (deuteranopia). With increasingly large numbers of sets, this adaptation is relaxed to make sure that colors are kept visually distinct. `euler()`

now uses`nlm()`

instead of`optim(method = "Nelder-Mead")`

for its final optimization.

- The previous algorithm incorrectly computed loss from unions of sets. It now computes loss from disjoint class combinations.
- Added missing row breaks in
`print.eulerr`

.

- Final optimization routines have been completely rewritten in C++ using Rcpp and RcppArmadillo.
- Switched to the cost function from EulerAPE for the default optimization target but added the possibility to choose cost function via a
`cost`

argument (currently`eulerAPE`

or`venneuler`

). - Added the option to produce conditional eulerr plots via a
`by`

argument to`eulerr`

. The result is a list of Euler diagrams that can be plotted in a grid arrangement via a new plot method. - Improved label placement by using a two-dimensional kernel density estimation instead of means to calculate label centers.

- Cleaned up typos and grammar errors in the
*Introduction to eulerr*vignette. - Added
`mar`

argument to`plot.eulerr`

with a default that produces symmetric margins. - Corrected the implementation of the
`stress`

statistic from venneuler. - Switched to Vogel sampling to generate points to choose label positions from.
- Minor clean up and performance fixes all around.
- Added a
`print.eulerr`

method. - Updated vignette to cover new features and changes.

- The first release.