# 18.0

* fix `HCP_32k_mwall_template`
* fix: set `pixdim` and `pixunits` when writing NIFTIs.
* bug fix in `resample_gifti` when `resamp_res` and `original_res` are NULL
* update NIFTI --> CIFTI conversion info
* update README w/ Limbic A and B in Yeo 17 info
* updates to vignette
* add message to `load_surf` if hemisphere not provided
* add `replace_NA_with_label` 
* add qform <-> transformation matrix conversions for reference

# 17.4

* Set read/write default for `brainstructures` to `"existing"` (rather than all or just cortex).
* `impute_xifti`: Add this function which imputes values based on nearby locations.
* `newdata_xifti` and `as.matrix`: Add `subcortex_by_bs` argument.
* `make_xifti`: Allow character input for intent.
* `convert_xifti`: Keep old names and labels if present.
* Update workbench path for Mac
* Convert unacceptable subcortex brain structures to "Other"
* Fixes to `match_exactly`.
* Clean up package and documentation.

# 16.1

* `move_to_submask` and `move_from_submask`
* add support for writing older xiftis w/o "Other" level in sub labels
* fix subcortex bugs

# 15.0

* Make default of `read_cifti` all brain structures, instead of left and right cortex only
* add "Other" to subcortex levels

# 14.0

Minor fixes and improvements.

# 13.2

`ciftiTools` now has a couple functions which make working with parcellations easier. (A parcellation is a single-column dlabel CIFTI or `"xifti"` object. Each label level, or "Key", represents a "parcel." Each location belongs to exactly one parcel. Parcels are usually contiguous regions--but not necessarily. `ciftiTools` includes a few of the most commonly-used parcellations. These can be loaded with `load_parc`. Any other parcellation CIFTI file can be read in with `read_cifti`.)
* `apply_parc`: Apply a parcellation `"xifti"` to a data `"xifti"`. Can be used to compute the mean of each column, e.g. for FC calculation, but also supports applying any other function parcel-wise.
* `parc_vals_to_xifti`: Create a `"xifti"` from a parcellation and a numeric matrix of values corresponding to each parcel.

Other new functions:
* `remap_cifti`: an extension of resampling. Beware, we might revamp this function in the future.
* `surf_area`: computes the surface area attributable to each vertex or face of a `"surf"` object.

Changes to existing functions:
* `convert_xifti`, `convert_to_dlabel`: arguments related to levels & labels have been renamed to match `factor` more closely.
* `separate_cifti` and `write_xifti2`: now require users to provide either the `write_dir` argument, or file names for each desired output file. This gives users more flexibility to control which files are written. 
* `view_xifti` qualitative color legend: add black outline.
* `view_xifti`, `view_volume`: print out indices of the selected subcortical slices.
* `unmask_subcortex`: now expects `xifti` input. If necessary, use the internal function `ciftiTools:::unvec_vol` to unmask a numeric matrix directly.

Bug fixes:
* `view_xifti`: fix bug where legend image was still written if `legend_fname=NULL`.

13.1 also includes misc. documentation and warning improvements.

# 12.0 (Jul 28, 2023)

New features
* Proper writing out of `dlabel` CIFTI data. Fixed problems if multiple columns or with subcortical data.
* Add `even_vert_samp`.
* Add `apply_parc`.
* Add `set_names_xifti`.
* Add `NA_color` argument to `view_xifti_surface`.
* Add `shadows` argument to `view_xifti_surface`.
* `mask_surf` takes in a `"surf"` object now.
* Misc. documentation and warning improvements.

# 11.0 (Jan 23, 2023)

Changes to default behaviors
* Add `crop` to `view_xifti_volume`; the default is `TRUE`. Previously the subcortical images were cropped to the anatomical image; now the default is to crop them to the data. 
* Change default of `orientation_labels` in `view_xifti_volume` to `TRUE`.
* Allow `NA` and `NaN` values in `"xifti"` objects with label data. Leave these values alone rather than making them into factor levels.
* Add warning if surface data are being upsampled
* Delete helper file surfaces written by `smooth_cifti` rather than returning their file paths.

New features
* Add adaptive resampling for surface data. The default remains barycentric. 
* Add surface manipulation functions from `BayesfMRI`.
* Allow `xii + mat` (and other operations)
* Add `scientific` argument to `view_xifti`. By default, scientific notation is determined automatically (as before).
* Misc. patches

Documentation
* Add lit vs unlit comparison to README
* Improved citations

# 10.0 (July 5, 2022)

* Fix error during resampling when only one hemisphere is present
* Better file I/O on mounted Google Drive
* Add new viridis color palettes
* Coerce new data input to newdata_xifti to numeric
* Add file extension to file name in write_xifti automatically, if not provided

# 9.0 (May 16, 2022)

New features
* Add convention and orientation_labels to view_xifti_volume (default: neurological, instead of radiological as it's been previously)
* Add together_ncol to view_xifti_* to control compositing layout
* Add fname argument to view_comp to save the result to a PNG file
* Allow "xifti" objects to have different resolutions in the left and right cortex
* Add citation to welcome message

Behind-the-scenes improvements
* Better file path management for system commands
* Better use of S3 group methods for Math, Ops, Summary functions
* Replace coveralls with codecov 
* Misc. patches

# 8.0 (February 1, 2022)

* Add more support for reading in v1 CIFTI files
* Better handling of file paths
* Better handling of optional `"xifti"` metadata
* `remove_xifti` can delete individual subcortical structures now
* Add `scale_xifti` which works like `scale`

# 7.0 (November 16, 2021)

* Add `view_comp`, and the argument `together` to `view_xifti_surface` and `view_xifti_volume`
* Fixes to `view_xifti_surface` and `view_xifti_volume`
* Add limited support for v1 CIFTI
* Fix some file paths of written files
* Lower default surface smoothing from sigma = 5 to sigma = 3
* Add `trans_units` to subcortex metadata
* Rename `write_cifti_components` as `write_xifti2` and export
* Add (in)equalities between `"xifti"` objects
* Add workbench download URL to start message.
* Add internal functions `vox_locations` and `edit_mask_surf`

# 6.0 (September 13, 2021)

* Revamped subcortical visualization with `view_xifti_volume`! Added tests for it.
* `plot` will now show both the cortex and subcortex, if both are present. The plots will share the color mode, color palette, and zlim.
* Revamped `summary`/`print` for `"xifti"` objects
* Faster border computation in `read_xifti_surface`

# 5.0 (August 31, 2021)

* Oops! The MNI image was removed in one of the recent versions. Added it back.
* Minor fixes

# 4.3 (August 14, 2021)

* Fix bug in `read_cifti_convert` where surfaces are not included
* Switch from `ciftiTools.files` back to a function, `ciftiTools.files()`, because the latter doesn't actually work
* Better handling of bad argument inputs and of the case where `rgl.useNULL()` in `view_xifti_surface`

# 4.2 (August 10, 2021)

* Rename `unmask_vol` to `unmask_subcortex`

# 4.1 (August 7, 2021)

## Changes affecting users

* New interface for reading in data included in the package
    * `ciftiTools.files` replaces `demo_files()`. This variable is created in the user's environment upon `library(ciftiTools)` with lazy loading
    * `ciftiTools.files` will only contain the inflated surface. To import the other two surfaces, use `load_surf()`. Removed the `"surf"` option from `ciftiTools.setOption`.
* Better handling of surfaces
    * `add_surf` will automatically resample the surfaces if needed
    * `read_surf` has the argument `resamp_res` to enable resampling upon reading in the surface, similar to `read_xifti`
* `newdata_xifti` will accept a length-one vector, to create a constant-valued `"xifti"`
## Notes for developers

* `ciftiTools.data` contains the surfaces and parcellations building blocks, and the HCP 32k medial wall

# 4.0 (August 4, 2021)

## Changes affecting users

* New surfaces! Check out `ciftiTools.setOption("surf", ...)` The default surface is still very inflated, but different.
* Parcellations are now included in the package! Check out `load_parc`.
* Add `apply_xifti`
* Add `move_to_mwall` and `move_from_mwall`
* Add `idx` argument to `read_xifti` and related functions
* Add `...` argument to `transform_xifti`
* Add `write_surf`, an alias for `write_surf_gifti`
* Export `fix_xifti`, which ensures `xifti$data` entries are matrices
* Fix legend plot file placement in `view_xifti_surface`

## Notes for developers

* Updated package documentation
* `make_surf` is now an alias for `read_surf`, instead of the other way around

# 3.1 (June 16, 2021)

## Changes affecting users

* `convert_xifti` accepts CIFTI files too
* Add `as.matrix` S3 method
* Fix interactive papayar view for `view_xifti_volume`

## Notes for developers

None
# 3.0 (June 13, 2021)

## Changes affecting users

* Rename `concat_xifti` as `merge_xifti`
* Rename `gifti_to_surf` as `read_surf`
* Add `combine_xifti`
* Add `convert_xifti` and make the individual conversion functions (e.g. `convert_to_dlabel`) internal
* Add `smooth_gifti` for metric GIFTI smoothing
* Add S3 method `dim` for `xifti` objects
* Add `legend_alllevels` arg to `view_xifti_surface`
* More control over legend file name in `view_xifti_surface`
* Add intent to summary output
* `write_xifti` will infer the intent/extension if not included in output file name
## Notes for developers

None

# 2.2 (March 16, 2021)

## Changes affecting users

None

## Notes for developers

* Add `run_ciftiTools_tests.R` to `.Rbuildignore`

# 2.1 (March 15, 2021)

## Changes affecting users
* Search for "wb_path" during `ciftiTools.setOption` call, and never afterward
* Ignore Workbench warnings, for the most part
* Remove arguments concerning intermediate files in `resample_cifti` and `read_cifti`
* Too many changes to document for `view_xifti_surface`!
* `transform_xifti` improvements
* Export `remove_xifti`
* Add `rotate_surf`, `select_xifti` and `concat_xifti`

# 2.0 (February 2, 2021)

## Changes affecting users
* Replace `surface_sigma` with `surf_FWHM` and likewise for volume
* Better handling of plotting surface or volume in `view_xifti`

# 1.6.1 (January 29, 2021)
## Changes affecting users
* Warn user (instead of raising an error) when the data has more medial wall vertices than non-medial wall vertices.
* New handling of color mode, default colors and color limits.
* Save color legends too, if saving surface plots.
* Label for widget slider.
* Move `fields` and `rgl` from Suggests to Imports.
* Remove `wb_path` argument. (Use `ciftiTools.setOption("wb_path", "path/to/workbench")`)
* `transform_xifti` to apply unary functions
* Add mathematical operations: `exp(cii) / 5 + cii2`
* `newdata_xifti` to substitute data

# 1.6 (November 10, 2020)

## Changes affecting users

* `smooth_cifti`
    * Add smoothing a `xifti` directly
    * `cifti_target_fname` is optional to `smooth_cifti`; will be auto-generated if `NULL`
    * Use the surfaces included with the `ciftiTools` package if not provided to `smooth_cifti` when corresponding cortex data exists
* `view_xifti_surface`
    * Rename arguments regarding interactivity
    * Add option to draw borders for qualitative coloring
    * Add color legend with names of labels for qualitative coloring
* Rename `surface` class to `surf`
* `as.xifti`
    * Use HCP 32k mwall when not provided, by default (add option to control)
    * Add option to add column names
* Retain more CIFTI metadata during resampling
* Reduce package size to < 5 for CRAN by resampling demo files.

## Notes for developers

* Add `run_ciftiTools_tests.R` (and add to .Rbuildignore)
* Do not try linking to RColorBrewer::brewer.pal.info because it is an object, not a function.
* Correct `ciftiTools.listOptions` and `ciftiTools_msg`
* Make `gifti_to_surf` an alias to `make_surf`

# 1.5 (October 2, 2020)

## Changes affecting users

* Add widget with slider for `view_xifti_surface` when more than one `idx` is requested!
    * Replace `mode` argument with `interactive` argument
    * Automatically use widget or video frames if more than one `idx`
* Resilience to missing "MetaData" entry in CIFTI$Matrix

# 1.4.2 (September 25, 2020)

## Changes affecting users

* `view_xifti_surface`
    * Option to draw vertices and edges
    * Automatically use (and resample to match data resolution) included surfaces, in most cases where surfaces were not provided
* `view_xifti_volume`
    * Fix error when data are integers
    * Check that image dimensions and transformation matrix match with MNI template before plotting
    * Use 9 slices instead of 12 by default (when not using `papayar`)
* New argument `mwall_values` to relevant functions. 
    * The values will be used to infer the medial wall if the medial wall is not explicitly specified
    * Default: `NA` and `NaN` 
    * This argument can be set to `NULL` to not infer the medial wall from the data
* Better reading & writing of NIFTI and GIFTI files
    * Export and import 4x4 transformation matrix with CIFTI and NIFTI files
        * Use the `TransformationMatrixIJKtoXYZ` in CIFTI files
        * Use the `sform` codes in NIFTI files
    * Export and import label table and column names with CIFTI and GIFTI files (for `dlabel` and `dscalar`)
    * Write NIFTI with `RNifti` instead of `oro.nifti`
* Corrected separating, writing and resampling `*.dlabel.nii` files
* Make `cifti_fname` in `read_cifti` optional (can read in just the surfaces)
* Warning if brainstructure is requested but not available (instead of error)
* Convert smoothed `dlabel` to `dscalar` (and add warning, because it's probably something you don't want to do)
* Documentation improvements

## Notes for developers

* Improved handling of bad arguments to `make_subcort`
* Split `info_cifti_raw` into `header_cifti` and `xml_cifti`
* Add the internal functions `remove_xifti`, `expect_equal_xifti` and `fix_gifti_mwall`
* `view_surf` is now a wrapper to `view_xifti_surface` instead of being its own function
* Move color functions to `utils_color`. 
* Make `ROY_BIG_BL` have an extra value to fix legend range. 
* Handle constant-valued data in `view_xifti_surface`
* Export color functions
* Add "hemisphere" metadata to \code{"surf"} objects, and check that it matches if it exists. For example, `as.xifti(surfL=surfR_gii)` will cause an error
* Move `rgl` and `fields` to Suggests
* Add a few new tests based on these changes

# 1.4 (August 31, 2020)

## Changes Affecting Users

* Spheres are no longer required to input for resampling
    * In-register spheres are generated automatically based on the cortical resolution
* Full label table list for `dlabel.nii` files
* Add `smooth_cifti`
* Add `resample_cifti_from_template`
* Add helpful error message if `plot(xii)` is called without any surface or subcortical data
* `view_xifti_surface` improvements:
    * Use column index or name as the default title
    * Improved qualitative color mode
    * Use qualitative color mode and label table colors if the CIFTI is a `dlabel.nii` file (intent 3007)
* `view_xifti_volume` improvements:
    * Fix `num.slices` argument
    * Add `...` for additional arguments
* Add `view_surface` for `"surface"` objects
* Add `summary` and `plot` methods for `"surface"` objects
* Warning if GIFTI version is too old (need the one on github for `writegii`)
* Tweaks to `view_xifti_surface` defaults
* Add `view_xifti_volume` without structural image
* If a function writes a file(s) as its main side effect, return a named character vector of the written file paths.
    * Previously some functions returned `TRUE` while others returned a `list` or `data.frame` of written file paths
* Out-of-mask values (medial wall for cortex and non-subcortical voxels for subcortex)
 are no longer inferred from the data values when making a `"xifti"` from GIFTI and NIFTI files. Previously, if a mask was not provided then constant `0`, `NA`, or `NaN` values were deemed out-of-mask. Now, `ciftiTools` uses ROI files to keep track of the out-of-mask values in `read_cifti_separate` and `resample_cifti`, and requires the masks to be explicitly provided in `as.xifti`
* Rename `make_surface` as `make_surf`
* Rename `is.surface` as `is.surf`
* Rename `side` argument as `hemisphere` argument (same choices: `"left"` or `"right"`)
* Fixed the alias functions, e.g. `readCIfTI` and `readcii` for `read_cifti`

## Demo files

* The demo files from NITRC are now included with `ciftiTools`: https://www.nitrc.org/frs/download.php/8541/cifti-2_test_data-1.2.zip

## Notes for Developers

* Add tests for most user functions
* Rename `write_xifti_components` as `write_cifti_components`
* Remove `metric_resample` and `surface_resample` (use `resample_gifti` directly)
* Rename `make_helper_spheres` as `write_spheres`, and do not export it
* Rename `unmask` as `unmask_vol` (to distinguish from `unmask_cortex`)
* Remove `data-raw` from R package build
* Require `gifti > 0.7.5`
* Clean up `onAttach` and `.Rbuildignore`

## Vignette!

It will be located here: https://htmlpreview.github.io/?https://github.com/mandymejia/ciftiTools/blob/master/vignettes/ciftiTools_vignette.html once we push to master. Until then, replace "master" with "1.4"

# 1.3 (August 24, 2020)

* introduce `"xifti"` object: can be made from CIFTI file, GIFTI surfaces, or new data
    * To make a `"xifti"` from data: `as.xifti(...)`
    * To make a `"xifti"` from a CIFTI file: `read_cifti(cifti_fname)`
    * To make a `"xifti"` from a GIFTI surface: `as.xifti(surfL=make_surf(surfL_fname))`
* `read_cifti_flat` now uses XML metadata directly (but still obtains XML via Connectome Workbench)
    * This allows for reading in more metadata such as time start/step for `.dtseries.nii`
* `write_surf_gifti` and `write_metric_gifti` as wrappers to the new `gifti::writegii`
    * Currently depends on `damondpham/gifti` but this will hopefully be merged to main repo soon
* `write_subcort_nifti` to write out subcortical components from `"xifti"` to a NIFTI file
* `write_cifti` can also write the surfaces attached to the `"xifti"`
* `"xifti"` objects can contain surfaces without any data. 
    * `view_xifti_surface` can view a surface without any data: `plot(as.xifti(surfL=left_surf))`
* `resample_surf` to resample a surface object 

# 1.2 (August 7, 2020)

* `read_cifti_flat` and `read_cifti_separate`
* flatten subcortical data in `"cifti"` object. unflattening functions.
* image view mode
* `write_cifti`
* better handling of medial wall
* Subcortical color table added for writing CIFTIs. Taken from: https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/AnatomicalROI/FreeSurferColorLUT

# 1.1 (July 24, 2020)

## New names

Most of the functions were renamed. In general, `cifti_[action]` is now `[action]_cifti`. So to open and visualize a CIFTI file, one would use `read_cifti()` followed by `view_cifti()`. To save a resampled version of a CIFTI file, one would use `resample_cifti()`. 

Arguments were also renamed for consistency across functions:

* Arguments referring to file names all end in `_fname` instead of beginning with `fname_`.
* The cortical data, `surf_L` or `cortex_left`, are now `cortexL` (likewise for right).
* The surface geometry data, `gifti_left` or `surf_left`, are now `surfL` (likewise for right).
* The helper sphere for resampling, `sphere_L`, is now `sphereL` (likewise for right).
* `sphere_orig_L` is now `sphereL_original` (likewise for right; likewise for other original files).
* `sphere_target_L` is now `sphereL_target` (likewise for right; likewise for other target files).
* The resampling resolution, `target_res` or `resample`, is now `resamp_res`.
* The Connectome Workbench argument `wb_cmd` is now `wb_path`.
* `outdir` is now `write_dir`.

## New functionality

There are a few new functions:

* `read_cifti_flat()` reads the cortical and surface data together as a single matrix. 
    * It is much faster than `read_cifti()`.
    * It works by using the Connectome Workbench command `-cifti-convert -to-gifti-ext`. 
    * `flatten_cifti()` converts a `"cifti"` object to this same matrix. 
    * `read_cifti()` with `flat==TRUE` will call `read_cifti_flat()`.
* `make_xifti()` creates a `"cifti"` object from its components.
    * Each component can be provided as a file name or R object.
* `view_cifti()` plots the CIFTI data.
    * It calls `view_cifti_surface()` unless no cortical data exists, in which case it will try `view_cifti_volume()`.
    * `view_cifti_surface()` was rewritten using the `rgl` package directly.

And, a few new arguments:

* `sep_keep` and `resamp_keep` indicate whether separated or resampled files should be deleted after reading in the CIFTI data (`read_cifti()`) or writing the resampled CIFTI file (`resample_cifti()`). Their default values are `FALSE`. in which case these files are written to a temporary directory (regardless of `write_dir`). 
* `sep_fnames` and `resamp_fnames` can be used to set the file names for the respective files made by `read_cifti` and `resample_cifti`.
    * The default separated and resampled file names have been updated; see `cifti_component_suffix`.

Other updates:

* Print execution times for each step in `separate_cifti()` and `resample_cifti()` if `verbose==TRUE`.
* Add option to set Connectome Workbench directory for the entire session with `ciftiTools.setOption('wb_path', 'path/to/workbench')`. 
    * Either the folder or executable path can be provided.
* Handling of spaces and parentheses in file names.
* The ROI data can be separated and resampled. However, the `"cifti"` object does not support ROIs, so they are ultimately not loaded. 
    * Please contact the developers if you are interested in this functionality.
    * A workaround would be to separate/resample the ROIs, and then read them in with `make_xifti()` (haven't tested this yet).
* Add option to store a zero-value threshold, `EPS`. Set it with `ciftiTools.setOption("EPS", 1e-8)`. This is used by `view_cifti()` and `flatten_cifti()` to detect constant zero brainordinates.
* Several function aliases, for example `readCIfTI()` and `readcii()` for `read_cifti()`.
* `plot()` method for `"cifti"` objects.

## Removed functionality

* The `overwrite` and `make_helper_files` arguments were removed. All functions will overwrite existing files, and this cannot be changed.
* A `"cifti"` object will only support one surface geometry model at a time.
    * `view_cifti()` can accept a surface GIFTI file directly. 
* The default brainstructures are `left` and `right` only (excludes the subcortical data).

## Notes for developers

* Replaced `oro.nifti::readNIfTI()` with `RNifti::readNifti()` for faster reading of subcortical data.
* Made formal classes for each CIFTI file component: `"cifti_surface"`, `"cifti_subcortical"`, `"cifti_cortex"`, `"cifti_volume"` and `"cifti_label"`.
* Replaced `read_separate_cifti()` with `read_cifti()`, which calls `separate_cifti()`, `resample_cifti_components()` (optionally), and `make_xifti()` in that order. 
* Rewrote `resample_cifti()`. The new version calls `separate_cifti()`, `resample_cifti_components()`, and then uses a template to create the new CIFTI file. (The first half is nearly identical to `read_separate_cifti()`.)
* Moved common argument/parameter descriptions to `rox_args_docs.R`. Use `@inheritParams` to reference these descriptions. This should make maintaining them across the entire package easier.
* Wrapper functions `separate_cifti_wrapper()` and `resample_cifti_wrapper()` to avoid duplicate code across `read_cifti()` and `resample_cifti()`. These should not be used by end-users, so they are not exported.
* Split utility functions into `utils.R` for general functions and `utils_cifti.R` for CIFTI-specific functions.
