Tool Types

In order to make development of new Tools quick, easy and relatively boilerplate-free, all Tools extend one of three base classes, which provide the functionality required to integrate seamlessly into the Cornerstone Tools framework.

Base classes have two types of methods of interest to Tool developers:

  • @abstract methods: These methods must be implemented by subclasses.
  • @virtual methods: These methods have default functionality, but may be overridden by subclasses to alter functionality.

Check the api docs for full documentation of the api.

Base Tool

The BaseTool is the top level parent of all Tools in Cornerstone Tools. It takes care of initializing the Tool's configuration, applying mixins, and providing @virtual functions for mouse/touch interaction for Active tools.

  • Virtual Methods:
    • preMouseDownCallback
    • postMouseDownCallback
    • preTouchStartCallback
    • postTouchStartCallback

Base Annotation Tool

The BaseAnnotationTool is an extension of BaseTool for Tools that create and manipulate annotation data.

  • Abstract Methods:
    • createNewMeasurement
    • pointNearTool
    • distanceFromPoint
    • renderToolData
  • Virtual Methods:
    • mouseMoveCallback
    • handleSelectedCallback
    • toolSelectedCallback
    • updateCachedStats

Brush Tool

The BaseBrushTool is an extension of BaseTool for Tools which edit the brush colormap data, used for displaying segmentations. Unlike subclasses of BaseAnnotationTool, subclasses of BaseBrushTool don't manage the rendering of their own data. Rendering of the segmentation masks is centralized at src/eventListeners/onImageRenderedBrushEventHandler.js. If at least one subclass of BaseBrushTool is either Active, Enabled or Passive, the segmentation data is rendered to the canvas.

  • Abstract Methods:
    • renderBrush
    • _paint

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