Annotation - polygon tool

[jacksonjacobs1]

Annotation - Polygon Tool

Description

Implement a new polygon annotation tool to allow users to create, edit, and manage polygon shapes with undo/redo functionalities.

Feature Details

The feature will use an object called CurrentAnnotation to store the current annotation’s state information, supporting undo/redo operations and interactions with other tools.

CurrentAnnotation Fields

• data: reference to a data element in the ground truth layer
• undoStack: Stack to track previous states for undo actions.
• redoStack: Stack to track reverted states for redo actions.

State Change Conditions

CurrentAnnotation will reset on deselection, delete, and multi-selection events. Undo and redo actions will respectively pop the latest item from undoStack or redoStack and update CurrentAnnotation.

Tool Behaviors

On mousedown

• Identify the relevant polygon and check if it matches the CurrentAnnotation.
• If creating a new polygon, initialize CurrentAnnotation with default values.

On mousemove

• Polygon Tool: Draw a polyline that updates as the mouse moves.

On mouseup

• Save the currentState in undoStack and update the drawing based on the tool used.
• Commit the updated data to the backend.

Implementation Notes

• Library: Use polygon-clipping for handling complex shape operations.
• Redraw and State Management: Ensure the UI reflects the CurrentAnnotation updates accurately.

Acceptance Criteria

1. Users can create, edit, and delete polygon annotations.
2. Undo/Redo actions work consistently.
3. Mouse interactions update polygon annotations as described.
4. Brush and erase tools work without self-intersections in the final shape.

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References:

• polygon-clipping library