CHANGELOG.md

Changelog

All notable changes to this project will be documented here.

[unreleased]

[0.27.0] - Aug 18th, 2026

• Hovering a spatial annotation now draws a white outline that hugs its shape.
• Polish and update the confidence card to include the class name and fix its positioning.
• Fix shift-hover to properly start a new polygon complex layer.
• Fix bitmask moves to the image edge that were permanently truncating the mask. Now a translated mask bounces back to its previous position if it would be moved outside the image bounds.
• Improve read-only subtask handling. Subtasks marked read_only: true now actually prevent edits. Additionally, all subtasks may now be read-only (the previous "at least one non-read-only subtask" error has been removed).

[0.26.3] - Aug 13th, 2026

• Fix wheel-zoom and drag-zoom focal point when the ULabel container is offset from the viewport origin. handle_wheel and drag_rezoom used to pass raw clientX/clientY (viewport coords) straight into rezoom, which treats its focal-point arguments as annbox-local. When the container sat at viewport (0, 0) the two frames coincided and the bug was invisible; anywhere else (e.g. hosted inside a centered dialog, a padded panel, or below a header) zoom would snap by roughly the annbox's screen offset. Both call sites now convert to annbox-local via getBoundingClientRect() before calling rezoom, so zoom stays anchored to the cursor / mousedown point regardless of how the host embeds ULabel.
• New config option min_zoom_fit_ratio. Sets a zoom-out floor as a multiplier of the "whole image just fits the viewport" zoom. 0 (default) preserves the existing behavior (no floor). 1.0 prevents users from zooming out past the fit-to-viewport level. >1 forces the image to always overflow. Zoom-in is unaffected. The floor recomputes from live annbox dimensions, so it adapts to browser resize.

[0.26.2] - Aug 13th, 2026

• Fix regression in set_annotations() where hover feedback and the brush stopped working after a swap. The 0.26.1 bulk-teardown path called $("#canvasses__<subtask>").empty(), which removed not just the per-annotation canvases but also the subtask's front canvas and the #dialogs__<subtask> container (which owns the brush circle and polygon ender). state.front_context was left pointing at a detached canvas so hover highlights painted into nothing, and the brush had no parent to attach to. The teardown now removes only > canvas.annotation_canvas children, leaving the front/back canvases and dialogs container intact.
• New demo: demo/set-annotations.html with buttons that swap through empty / small / medium / large / RLE-bitmask / raw-Uint8Array-bitmask presets so this regression stays visible.

[0.26.1] - Aug 13th, 2026

• Bitmask annotations can now be imported as raw Uint8Array payloads. In addition to the existing RLE { counts, size } shape, spatial_payload may now be { data: Uint8Array, size: [height, width] }. This lets callers that already have the mask as a pixel buffer skip the RLE encode step before handing it to ULabel.
• Loader no longer flashes on fast operations. ULabelLoader.add_loader_div() now appends the overlay hidden and reveals it only after a delay (200 ms by default). Callers can pass an explicit delay_ms — including 0 to opt back into immediate-show.
• Performance: bulk teardown in set_annotations(). The old per-annotation destroy_annotation_context loop redrew remaining siblings on each canvas after every removal. The new path drops caches on outgoing annotations, empties the subtask's canvasses container in one shot, and resets annotation_contexts. Eliminates wasted redraws.
• Correctness: reset_interaction_state() in set_annotations() is now scoped to the target subtask. Previously the reset ran on every subtask, wiping is_in_edit / active_id on subtasks the caller wasn't touching.

[0.26.0] - Aug 11th, 2026

• Memory leak fix on teardown. Bitmask annotations attach a decoded pixel Uint8Array (_mask) and a tinted stencil canvas (_mask_render) to each annotation object. These persisted after remove_listeners(), and consumers that rebuild ULabel per navigation could accumulate multi-GB retained heap. Changes:
  • New destroy() method on ULabel. Idempotent; releases per-annotation bitmask caches, empties action/undo streams, breaks toolbox back-references, clears the resize-observer array, and wipes the container DOM. Callers should prefer destroy() over remove_listeners() going forward.
  • destroy_annotation_context() now also drops _mask / _mask_render / _bitmask_box_hint on the destroyed annotation, so set_annotations() also frees mask memory when it recycles contexts.
  • New auto_destroy_on_detach config option (default true). When enabled, ULabel installs a MutationObserver on the container's root and calls destroy() automatically after the container leaves the DOM.
  • set_annotations(), get_annotations(), and redraw_all_annotations() now short-circuit with a warning if called after destroy().
  • Fixed a latent typo in set_annotations() that wrote to a non-existent undo_stack property instead of clearing the real undone_stack.

[0.25.1] - Aug 10th, 2026

• The ConfidenceSlider toolbox item now also filters bitmask annotations
• The set_annotations() and swap_frame_image() public API methods now display the loading spinner while they run and return a Promise
• Bitmask brush overlap modes (exclude / overwrite) now resolve against bitmask annotations across all subtasks, not just the active one.
• Performance improvements for jobs with many large bitmask annotations:
  • Overlap resolution (exclude / overwrite) now uses a bounding-box pre-filter and box-limited pixel operations, skipping masks that don't overlap the stroke and touching only the overlapping region of the ones that do, instead of scanning the whole mask for each candidate.
  • Moving a bitmask renders only the moving mask over a cached snapshot of the others (throttled to one render per animation frame) instead of re-rasterizing every mask on the canvas each frame.
  • Each bitmask caches a pre-tinted render that is reused across redraws (brush dabs, moves, pan, zoom) and rebuilt only when the mask or its color changes, removing per-frame pixel-by-pixel rasterization.

[0.25.0] - Aug 5th, 2026

• Add a bitmask annotation mode for raster (per-pixel) segmentation, selectable via allowed_modes: ["bitmask", ...].
  • Painted with the brush (toggle with toggle_brush_mode_keybind, default g); erase with toggle_erase_mode_keybind (default e); resize the brush with increase_brush_size_keybind / decrease_brush_size_keybind (defaults ] / [) or alt+scroll. The brush/erase toggles now apply to both polygon and bitmask modes.
  • A paint stroke only joins an existing mask of the currently-selected class; painting a different class (or over empty space) starts a new mask of the selected class. Erase is class-agnostic. This differs from the polygon brush, which joins any polygon under the brush.
  • Hover a mask (with the brush off) to change its class via the ID dialog, or move/delete it like any other spatial annotation.
  • Each bitmask annotation stores a single binary mask. On export, spatial_payload is a COCO-style run-length-encoded object: { "counts": <number[]>, "size": [<height>, <width>] } (column-major, starting with a background run). Fully-erased masks are deprecated (ULabel's delete semantics).
  • Configurable render opacity for bitmask classes via mask_annotation_opacity.
• Add brush overlap modes for bitmask painting, controlled globally and persisted to localStorage: none (default), exclude, and overwrite.
  • exclude: newly-painted pixels never cover pixels owned by other undeprecated bitmask annotations (existing masks win).
  • overwrite: newly-painted pixels are removed from any other bitmask annotation that owned them (the new mask wins); a mask fully carved away is deprecated.
  • Resolution is deferred to the end of a stroke (you see the active mask cover others, then it snaps to the resolved result on release) and only affects the pixels a stroke adds; erase is unaffected.
  • Selectable via the Brush toolbox item (shown in bitmask mode) and keybinds set_brush_overlap_none_keybind / set_brush_overlap_exclude_keybind / set_brush_overlap_overwrite_keybind (defaults shift+n / shift+e / shift+o), which also appear in the Keybinds toolbox item. Initial value configurable via default_brush_overlap_mode.
  • Brush toolbox buttons have hover tooltips.

[0.24.0] - July 22nd, 2026

• Add ConfidenceSlider toolbox item (AllowedToolboxItem.ConfidenceSlider) that deprecates (hides) or shows spatial annotations based on their confidence values. Unlike the now-deprecated KeypointSlider, it works with all spatial annotation types that have a confidence payload (bbox, bbox3, polygon, polyline, contour, tbar, and point), across every subtask.
  • Supports a single global "all" slider and/or per-class sliders, controlled by class_filter_mode ("toggle", "all-only", or "class-only").
  • Configurable via confidence_slider_toolbox_item, including filter_min/filter_max/step_value, per-class default_values, target_spatial_types, and target_class_ids.
• Add get_confidence_slider_value() public API method to get the current confidence slider values.
• The default toolbox_order (used when none is provided) now includes ConfidenceSlider instead of KeypointSlider.
• Log a warning when both the KeypointSlider and ConfidenceSlider toolbox items are enabled at once.
• Deprecate the KeypointSlider toolbox item and get_keypoint_slider_value() in favor of the ConfidenceSlider and get_confidence_slider_value(). The KeypointSlider is retained for backwards compatibility and continues to filter only point annotations. It will be removed in a future release.

[0.23.7] - July 21st, 2026

• Ship generated .d.ts declarations (dist/types/) and a generated type entry (dist/index.d.ts) instead of pointing consumers' type resolution at the raw .ts source. This stops downstream TypeScript projects from compiling ULabel's source under their own (stricter) tsconfig.
• Stop publishing the src/ directory in the npm package (files now ships dist/ only).

[0.23.6] - May 11th, 2026

• Fix AnnotationList class ordering to match the AnnotationID toolbox item ordering, which is based on the configured class definition order in the subtask's classes array
• Add local storage of checkbox options for the AnnotationList toolbox item

[0.23.5] - May 6th, 2026

• Fix bug where on some browsers, middle-click-drag when annotations were vanished would trigger auto-scroll rather than the normal pan behavior.

[0.23.4] - May 5th, 2026

• Fix type declarations for npm consumers
• Add "files" field to package.json to explicitly control published package contents.
• Add CI type-test job that validates type declarations against a packed tarball.

[0.23.3] - Mar 18th, 2026

• Add get_keypoint_slider_value() public API method to get the current keypoint slider value (0-1).
• Add get_distance_filter_value() public API method to get the current distance filter slider values.

[0.23.2] - Mar 18th, 2026

• Fix bug where multiple spaces in a submit button name would cause the button hook to not fire.

[0.23.1] - Mar 18th, 2026

• Fix export of typescript types
• Add ULabel.get_resize_toolbox_item() static method to get the AnnotationResizeItem class, which has static methods that allow for programmatic control of annotation size for subtasks.

[0.23.0] - Jan 16th, 2026

• Add vertex deletion keybind for polygon and polyline annotations
  • New configurable delete_vertex_keybind (default: x)
  • Delete individual vertices by hovering over them and pressing the keybind
  • Automatically deletes entire polyline if only 1 point remains after deletion
  • Automatically removes polygon layer if fewer than 3 points remain after deletion
• Fixed bug where deleting an annotation mid-edit would cause the ULabel state to be stuck in edit mode.

[0.22.1] - Jan 13th, 2026

• Don't draw annotations when a subtask is vanished
• Add configurable annotation_vanish_all_keybind
• Track annotation size per subtask
  • Remove annotation size cookie, since it was tracking just one size per annotation session
• Deprecated the default_annotation_size argument in the configuration object. Use the initial_line_size argument instead. See api_spec.md for details.
• Fix toolbox collapse arrow positioning, and make frame annotation dialogs disappear on collapse
• Removed the line_size property from annotation objects. subtask.state.line_size determined the size of drawn annotations within a subtask.

[0.22.0] - Oct 30th, 2025

• Add collapsible toolbox with arrow button at top
  • Toolbox collapse state persists in browser
  • Annotation canvas expands to fill space when toolbox is collapsed
• Add Keybinds toolbox item for viewing and customizing keybinds
  • Display all configurable keybinds with labels and descriptions
  • Edit keybinds by clicking and pressing new key combination
  • Support for modifier key chords (shift, ctrl, alt, meta)
  • Collision detection with red highlighting for duplicate keybinds
  • Reset individual keybinds or all keybinds to defaults
  • Visual indicator (yellow highlight) for user-customized keybinds
  • User keybind settings persist in browser
• Rename create_bbox_on_initial_crop to create_bbox_on_initial_crop_keybind for consistency
• Split change_zoom_keybind into two separate keybinds:
  • reset_zoom_keybind (default: r) - Reset zoom to fit image
  • show_full_image_keybind (default: shift+r) - Zoom to show full image
• Store collapse/expand state for Keybinds, Annotation List, and Image Filters toolbox items
• Add comprehensive e2e tests for keybind functionality and keybind toolbox item

[0.21.0] - Oct 27th, 2025

• Add toast notification that shows on fly_to calls and shows annotation position in the ordering (e.g., "3 / 10")
• Add AnnotationList toolbox item for managing and navigating annotations
  • Displays all annotations in a scrollable list with spatial type icons and class names
  • Bidirectional hover highlighting between list and canvas
  • Filter options:
    • Toggle show/hide deprecated annotations (default: hidden)
    • Group annotations by class
  • Collapsible interface to maximize toolbox space
• Add automated package deployment via GHA

[0.20.0] - Oct 15th, 2025

• Add fly-to functions, which sets the zoom and focus to a specific annotation
  • fly_to_next_annotation()
  • fly_to_annotation_id()
  • fly_to_annotation()
• Add Tab and Tab+Shift default keybinds to fly-to the next/previous annotation, respectively
  • Keybinds are configurable:
    • fly_to_next_annotation_keybind
    • fly_to_previous_annotation_keybind
• Add ImageFilters toolbox item to expose sliders for the following image css filters:
  • brightness
  • contrast
  • hue rotate
  • invert
  • saturate
• Removed redundant dependencies that were being unnecessarily installed by users using npm to install ulabel
• Updated webpack build process to properly provide both a minified (default) and unminified build (for better debugging)
  • Added package exports field with options: . (minified), ./min (minified), ./debug (unminified)
• Add test coverage for both minified and unminified builds
• Update dependencies and fix 12 security vulnerabilities

[0.19.1] - Oct 9th, 2025

• Add automated testing to the repo
• Fix circular webpack builds by forcibly cleaning the dist/ directory before each build
  • Also use import type... from ".." instead of just import to fix ts not properly resolving imports to js
  • Reduced bundle size from ~20 MB -> 1 MB
• Refactor some more console.warn and console.error instances to use log_message
• Remove deprecated parent_id field from ULabelAnnotation

[0.19.0] - Aug 19th, 2025

• Add minimal lineage tracking via last_edited_by and last_edited_at annotation fields
• Prevent creation of zero-length polylines
• Fixed process_resume_from not actually populating missing annotation fields on load
• Misc bug/QOL fixes
  • Simplified/fixed non-spatial annotation creation/deletion
  • Replaced alert, throw, and console calls with log_message()
  • Cleanup of suggest_edits() and other functions related to toggling dialogs
  • Refactor action stream management and undo/redo flow into actions.ts
    • Move a lot of repeated rendering/cleanup steps after actions into general action listeners that trigger on similar actions
    • Move annotation_id out of undo/redo payloads and into the action itself

[0.18.2] - July 28th, 2025

• Fix special characters in submit buttons breaking tool

[0.18.1] - July 22nd, 2025

• Fix "Annotation ID" text color in night mode

[0.18.0] - July 21st, 2025

• add allow_annotations_outside_image arg to the ULabel constructor, which defaults to true.
  • when set to false, new annotations will be limited to points within the image, and attempts to move annotations outside the image will bounce back.

[0.17.0] - May 30th, 2025

• Add anno_scaling_mode argument to the ULabel constructor, which allows users to specify how the size of annotations should be scaled when the zoom level is changed.
  • Options are fixed, match-zoom, and inverse-zoom.
  • When set to fixed, the line size of annotations will remain constant regardless of zoom level.
  • When set to match-zoom, the line size of annotations will increase with increased zoom level.
  • When set to inverse-zoom, the line size of annotations will decrease with increased zoom level.
• Prior behavior is equivalent to anno_scaling_mode = "fixed".
• Fix bug where fully erased polygon annotations would cause the an error upon submit.

[0.16.4] - May 2nd, 2025

• Fix bug where empty polygon layers could be included in a submit_button hook payload.

[0.16.3] - Apr 25th, 2025

• Fix bug where the Vanish button wouldn't update its locked state when switching between subtasks.
• Fix bug where clicking the Vanish button would unexpectedly set the size cookie, causing future annotations in the same subtask to be loaded in a very small size on subsequent sessions, with the only way to recover being to increase the annotation size.

[0.16.2] - Apr 2nd, 2025

• Fixed bug introduced in v0.15.0 where using the erase tool such that a polygon was separated into multiple disjoint regions would cause an unrecoverable error.

[0.16.1] - Jan 13th, 2025

• Added click_and_drag_poly_annotations flag to the configuration object, that when set to false prevents continuous points from being added to a polyline or polygon annotations when clicking and dragging.

[0.16.0] - Nov 8th, 2024

• Added loading overlay with spinning icon while ULabel is initializing
• Moved several existing utilties (mostly static methods) to isolated files:
  • Event listener management to listeners.ts
  • Night mode cookie to cookies.ts
  • Logging to error_logging.ts
  • Canvas initialization to canvas_utils.ts
  • Initialization logic (vastly simplified) to initializer.ts
• Changed after_init to be an instance function
• Removed load_image_promise in favor of .decode()
• Added many new entries in index.d.ts

[0.15.3] - Oct 4th, 2024

• Fix issue where legacy submit button functionality would break loading

[0.15.2] - Oct 4th, 2024

• Change set_saved on submit buttons to be a true boolean, rather than an optional boolean that could needlessly force a reload prompt

[0.15.1] - Oct 4th, 2024

• Change deprecation cases to use dedicated mark_deprecated function

[0.15.0] - Oct 3rd, 2024

• Added ESLint to enforce code quality and consistency

[0.14.1] - Oct 2nd, 2024

• Add a brush-button-active CSS class to the "brush" and "erase" buttons that visually depicts when the brush or erase tool is active

[0.14.0] - Oct 1st, 2024

• Add .get_current_subtask_key() and .get_current_subtask() utility methods
  • Updated almost all internal methods to use these utility methods

[0.13.1] - Sept 30th, 2024

• Remove unecessary and confusing default in global edit dialog
• Squash active_annotation into edit_candidate in subtask state
• Fix missing fields in ULabelSubtask.state.edit_candidate

[0.13.0] - Sept 26th, 2024

• Fix bug where the filter_annotations_on_load = true option would not work as expected.
  • The keypoint_slider_default_value option was not being properly multiplied by 100 internally.
• Move several config argument defaults into the configuration class instead of in the ULabel constructor.
• Add get_allowed_toolbox_item_enum() static method to ULabel.

Breaking Changes

• Changed default for filter_annotations_on_load from false to true.
• Deprecated the default_toolbox_item_order argument in the ULabel constructor. Use toolbox_order instead.
• Deprecated config_data argument in the ULabel constructor. Instead, pass all configuration options as keyword arguments directly to the ULabel constructor.
  • For now, the config_data argument will still work, but may be removed in a future release.

[0.12.5] - Sept 26th, 2024

• Fix release workflow using actions on node 16, which is now deprecated.

[0.12.1 - 0.12.4] - Sept 26th, 2024

• Prevent default mouseup event when listening for the end to a drag event.
• Multiple publishes are from testing in a netlify app.

[0.12.0] - Sept 20th, 2024

• Improvements to performance of the FilterDistance Toolbox item:
  • Switch to new redrawing util functions and only redraw annotations when necessary
  • Greatly reduce the number of distance calculations by only calculating distances for the newly modified annotation (polyline or point), rather than recalculating all distances for all annotations everytime.
  • Each point now tracks the id of the closest line in each class to further reduce the number of redundant calculations.
• Improvements to performance of the KeypointSlider Toolbox item:
  • Switch to new redrawing util functions and only redraw annotations when necessary
• Fix bug where delete modes and the FilterDistance toolbox item would clash.
• Expose n_annos_per_canvas arg to config_data as an advanced feature for performance tuning.
  • Also added some dynamic scaling of this value based on the max number of annotations in a single subtask if no value is provided by the user.
• Added disable_multi_class_mode flag to FilterDistanceConfig, which defaults to false. When true, the multi-class mode will be disabled and the checkbox will not be shown.
• Added filter_during_polyline_move flag to FilterDistanceConfig, which defaults to true. When false, the filter/overlay will not be updated until polyline moves/edits are completed. This can be useful for boosting performance when working with many annotations.
  • This option is also present as a checkbox option in the FilterDistance toolbox item.

Breaking Changes

• Renamed FilterDistanceConfig arg show_overlay_on_load -> show_overlay for internal consistency.
• Changed format of default_values arg in FilterDistanceConfig. The name for the single class mode default has changed from "single" -> "closest_row", and each entry in the object should be a DistanceFromPolyline object ({distance: <number>}), rather than a single number. See the updated api_spec.md for more details.
• KeypointSlider now works on all points in every subtask, even when the subtask is not active.
• Deprecated the new and is_new fields in ULabelAnnotation. There was internal inconsistency in their use, and some internal logic that depended on them was buggy and was sometimes preventing the FilterDistance slider from working as expected.

[0.11.0] - Sept 19th, 2024

• Fix bug where class counts wouldn't update when changing subtasks.
• Add size_factor arg to submit buttons to allow for custom sizing.
• Add row_number arg to submit buttons to allow for grouping buttons into rows.

[0.10.17] - Sept 18th, 2024

• Update api_spec.md indicating that polyline is no longer "under construction"
• Correct a few typos where init_crop should be initial_crop
• Correct typo where filter_low_confidence_default_value should be keypoint_slider_default_value

[0.10.16] - Sept 17th, 2024

• Catch a couple event listeners that were not being removed by remove_listeners().
• Suppress rare error from handle_toolbox_overflow().

[0.10.15] - June 13th, 2024

• Correctly update class counter after calling set_annotations().

[0.10.14] - June 12th, 2024

• Fix bug where very rarely, certain polygon annotations created outside of ULabel would cause ULabel to fail when processing resume_from.

[0.10.13] - June 7th, 2024

• Fix various bugs relating to the annotation count not updating as expected.

[0.10.12] - May 24th, 2024

• Fix broken undo/redo behavior for polygons.
• General improvements aimed at reducing memory usage and improving performance.

[0.10.11] - May 16th, 2024

• Fix bug where using the toggle_annotation_mode_keybind to switch to/from a delete mode would unexpectedly change the class of the hovered annotation.
• Fix bug where pressing a class keybind when using a delete mode would deselect the delete class.
• Fix bug where using set_annotations() with multiple subtasks would fail.

[0.10.10] - May 9th, 2024

• Fix bug where using Escape to cancel delete modes would sometimes create unexpected annotations
• Fix bug where undoing a cancelation of a delete mode did not allow for continuing with the delete mode annotation

[0.10.9] - May 8th, 2024

• Fix bug where confidence dialog didn't update properly.
• Fix bug introduced in 0.10.3 where dialogs don't show up for points annotations.

[0.10.8] - May 2nd, 2024

• Create method to remove all ULabel event listeners. This is handy for single page applications when the page is not reloaded after navigating away from a ULabel page.
• Fix bug where hovering over an id dialog would set the class, instead of waiting for a click.
• Fix bug where using the brush tool on an existing annotation would unexpectedly change its class.
• Fix bug where clicking a class' keybind when hovering over an annotation would not update the annotation's class if the new class was already selected in the toolbox.
• Fix very rare case where delete modes were being exported on submit.
• Changing id of a hovered annotation via the id dialog will no longer also change the active toolbox class id.

[0.10.7] - April 29th, 2024

• Enable the "change_zoom_keybind" to function even when the ZoomPanToolboxItem isn't present.
• Fix bug where using "set_annotations" would cause some loaded annotations to not generate edit dialogs.
• Fix bug where clicking the Annotation ID toolbox item would not update the brush color.

[0.10.6] - April 18th, 2024

• Fix bug introduced in 0.10.5 that caused non-polygon annotations not to load.

[0.10.5] - April 18th, 2024

• Fix bug where annotations could be saved with empty spatial payloads, which would cause an error when loading the annotations.

[0.10.4] - April 15th, 2024

• Change polygon ender icon to be smaller, partially transparent, and scaled with zoom.
• Color polygon ender and the brush circle based on the active class color.
• Fix bug where hitting the middle mouse button would sometimes open a new tab.

[0.10.3] - April 11th, 2024

• Improvements to hitboxes for polygons, points, and bboxes. The cursor must now actually be inside the annotation before showing the edit dialogs.
• Fix duplicate keybinds for increase/decrease of line size and brush size
  • [ and ] now decrement/increment brush size
  • alt+scroll still decrements/increments brush size
  • - and = still decrements/increments line size

[0.10.2] - April 10th, 2024

• Fix bug where using the erase tool to completely erase a polygon would sometimes cause an error.
• Fix npm publishing error from 0.10.1

[0.10.0] - April 9th, 2024

• Add optional keybind argument for each class in the classes array to allow for custom keybinds for each class.
• Double the zoom sensitivity
• Change the default scroll wheel behavior to zoom in/out on the cursor location instead of scroll up/down.
  • When frames are present, ctrl+scroll or shift+scroll or cmd+scroll will now scroll through the frames.
• Fix create_bbox_on_initial_crop to only work when in bbox mode, and make it start as the active class.
• Fix longstanding bug where the Annotation ID toolbox item would not update the annotation ID unless explicitly clicked.
• Fix bug where panning during brush mode would open a new tab.
• Fix bug where panning was disabled when actively drawing an annotation
• Fix rare bug where undoing an annotation would cause future annotations to never finish.

[0.9.4] - April 4th, 2024

• Fix bug where vanish mode was disabled during brush/erase mode
• Align undo behavior for polygons and polylines with that of other annotations (once complete, the undo will delete the entire annotation rather than undoing only the last point)
• Escape keybind to cancel an in-progress annotation

[0.9.3] - March 22nd, 2024

• Fix bug where erase mode could perist when changing annotation mode
• When user provides an initial_line_size, use that as the default size for new annotations, independent of zoom
  • When this argument is not provided, the behavior is unchanged from before (the size of new annotations will still scale with the zoom level).
• Fix bug where the DELETE_CLASS_ID would show up as an option in the id dialog for polygons and bounding boxes

[0.9.2] - March 21st, 2024

• Small fixes to submit_buttons in the toolbox.
  • Added optional set_saved argument for each submit_button to allow for the page to unload without warning if the button is clicked.
  • Changed default button css to better center the text.

[0.9.1] - March 12th, 2024

• Refactor of how annotations are drawn on the canvas. This change should make the drawing of annotations more efficient and less prone to lagging, especially when working with a large number of annotations or annotations with many vertices.
• Minor improvements to how resume_from errors are handled in the case of incorreclty formatted polygon annotations.

[0.9.0] - February 23th, 2024

Added DELETE_MODES = ["delete_polygon", "delete_bbox"], additional annotation modes for deleting annotations by drawing a polygon or bounding box around them.

• "delete_polygon": Allows drawing a polygon around an area, and all annotations within that area will be deleted
• "delete_bbox": Allows drawing a bounding box around an area, and all annotations within that area will be deleted

[0.8.0] - February 15th, 2024

Added a brush/erase tool for working with polygon annotations.

• Press g to toggle brush mode. This refers to a state in which click-dragging will place (or erase, if in erase mode) a circle at the cursor location to either augment an existing polygon or create a new one.
• Press e to toggle erase mode (indicated by the color of the brush circle: red for erase). When click-dragging in erase mode, the area in a circle around the cursor will be removed from an existing polygon. Can be used to create holes, isolated fills, or even delete annotations.
• Press = while in brush mode to increment the brush circle size by 10%
• Press - while in brush mode to decrement the brush circle size by 10%
• Hold Alt and scroll while in brush mode to increment/decrement the brush circle size
• Press Escape while in brush mode to exit brush mode and return to normal annotation mode
• Also added a BrushToolboxItem with buttons to perform the same function as the configurable keybinds listed above.

[0.7.0] - January 31st, 2024

• Added click-and-drag functionality when drawing polygons or polylines.
• Changed polygon representation from that of a simple polygon to a complex polygon. This allows for polygons to contain holes and/or multiple disjoint regions.
• Hold shift when closing a polygon to continue annotating a new region or hole.
• Hold shift when moving the cursor inside a polygon to begin annotating a new region or hole.
• Press Escape or crtl+z to cancel the start of a new region or hole.
• Added fill to polygons by default, excluding any holes in the polygon.
• Added check to ensure that deprecated simple polygons are auto converted to complex polygons when loaded by ULabel.

[0.6.14] - August 31st, 2023

• Fix class ID sort order requirement.

[0.6.13] - July 27th, 2023

• Added the "Tag It" github job which will automatically tag the git version after a pr into main.

[0.6.12] - July 19th, 2023

• Fixed the package entrypoints in package.json to point to the correct files. This should fix the issue where the package was not being imported correctly.

[0.6.11] - July 19th, 2023

• Fixed a bug that prevented custom submit buttons from being used with the legacy constructor arguments.

[0.6.10] - July 7th, 2023

• Reworked the overlay rendering logic.
  • Results in no longer having "infinite" zoom, but zooming should take no longer than ~2ms per operation instead of the >600ms it was previously taking.
• Also fixed a bug that caused ULabel to rerender the page on any keypress.

[0.6.9] - June 28th, 2023

• Updated ULabel's constructor to use keyword arguments instead of 11 arguments that must be passed in in the correct order.
  • This was frustrating because most default arguments use their default option and JavaScript doesn't allow you to ommit optional arguments if you want to modify a later argument.

[0.6.8] - June 26th, 2023

• Added utilities.ts to contain miscellaneous helper functions.
• Added is_object_and_not_array to utilities.ts to help check if something is an object and neither null nor an array.

[0.6.7] - May 26th, 2023

• Added multi-class support for the FilterPointDistanceFromRow ToolboxItem.
• Added an overlay for the FilterPointDistanceFromRow ToolboxItem that shows the range of the filter.
• Added a helper class SliderHandler to help with creation of new sliders and their event listeners.

[0.6.6] - June 7th, 2023

• Added helper function apply_gradient_math that reduces duplicated code from apply_gradient.

[0.6.1] - April 21st, 2023

• Added the FilterPointDistanceFromRow ToolboxItem.

[0.6.0] - Febuary 1st, 2023

• Massive update with lots of under the hood changes.
• Added a toolbox item for changing annotation color.
• Added a toolbox item for changing annotation size.
• Added a toolbox item for filtering out annotations based on annotation confidence.
• Added support for adding diffrent Submit buttons, such as a Reject button or Failure button.
• Added a display for annotation's confidence on hover.
• Added keybinds for most operations.

[0.4.21] - January 16th, 2022

• Fixed an issue with setting annotations at the frame/global level.

[0.4.20]

• bugfix in resume_from processing

[0.4.19] - October 15, 2021

• bugfix in resume_from processing

[0.4.18] - October 15, 2021

• added checks to ensure resume_from object is compatible

[0.4.16] - August 27, 2021

• Provides an example of how users can be requested to annotate just a window within an image
• Has better support for zooming into that region in the image
• Added a button to "re-center" on the initial crop that was provided

[0.4.15] - August 16, 2021

• Fixed security vulnerability

[0.4.14] - June 15, 2021

• Fixed security vulnerability

[0.4.13] - May 24, 2021

• ULabel now allows for classification payloads without items for certain classes, and just assumes that omitted classes have a confidence of zero

[0.4.12] - May 19, 2021

• Fixed issue with detecting undo/redo on Firefox and Mac
• Detected shift+scroll for zooming as well as cmd/ctrl+scroll
• Fixed small issue with beforeunload warning

[0.4.11] - May 18, 2021

• Allow submission when page first loads without having to make an edit first

[0.4.10] - April 1, 2021

• Call on_submit asynchronouly using await, and show loader until it finishes

[0.4.9] - April 1, 2021

• Added support for polyline annotation mode
• Added basic typescript typings
• Fixed the main property in package.json so it points to a valid file. Also added the module field which points to the es6 module at the src folder
• Moved express to the dev-dependencies because users of this module do not need to install express for the frontend only component
• Exported the ULabel class in the module

[0.4.8] - March 23, 2021

• Added the point annotation mode
• Added support for a link to instructions
• Added a set_saved() function so page can unload without warning
• Bound ulabel instance to submit callback so above function can be easily called

[0.4.7] - March 11, 2021

• Bugfix for resuming from nonspatial annotations
• Created interface for get and set to allow for custom annotation processing
• Changed to more inclusive keyboard event handling

[0.4.6] - March 9, 2021

• Added a function to swap background color for the annotation box
• Added generic callback support
• Added initial line size to the constructor
• Made cursor represent line size and color to be drawn
• Fixed incorrect links to repo from within package.json
• Now keeping track of whether edited since last save, and shows warning before unload if so
  • Callback is to return false if save is unsuccessful

[0.4.5] - March 7, 2021

• Removed a console debugging message that I forgot to remove for 0.4.4
• Fixed bug with "resuming from" in sessions with a single frame
• Fixed bug with init callback not getting called

[0.4.4] - March 7, 2021

• Added a changelog :)
• Added changelog entry to pull request checklist
• Fixed silent errors in src found by eslint
• Fixed shortcut suggestion for switching frames
• Fixed link to ulabel repo
• Added ctrl+s listener and attached it to the submit button
• Added option for inactive opacity to be configured for each subtask
• Added contructor parameter to start annotation session with image cropped to a specific bounding box
• Updated CSS rules to prevent unintuitive occlusion by global edit suggestion