Class GeometryReshapingTool

GoJS® Diagramming Components
version 3.0.2
by Northwoods Software®

This is an extension and not part of the main GoJS library. Note that the API for this class may change at any time. If you intend to use an extension in production, you should copy the code to your own source directory. See the Extensions intro page for more information.


  • Tool
    • GeometryReshapingTool

The GeometryReshapingTool class allows for a Shape's Geometry to be modified by the user via the dragging of tool handles. This does not handle Links, whose routes should be reshaped by the LinkReshapingTool. The reshapeObjectName needs to identify the named go.Shape within the selected go.Part. If the shape cannot be found or if its go.Shape.geometry is not of type go.GeometryType.Path, this will not show any GeometryReshaping go.Adornment. At the current time this tool does not support adding or removing go.PathSegments to the Geometry.

If you want to experiment with this extension, try the Geometry Reshaping sample.




  • Gets the go.Shape that is being reshaped. This must be contained within the selected Part.

  • A small GraphObject used as a reshape handle for each segment. The default GraphObject is a small blue diamond.

  • Gets or sets whether this tool supports the user's addition or removal of segments in the geometry. The default value is false. When the value is true, copies of the midHandleArchetype will appear in the middle of each segment. At the current time, resegmenting is limited to straight segments, not curved ones.

  • A small GraphObject used as a reshape handle at the middle of each segment for inserting a new segment. The default GraphObject is a small blue circle.

  • This read-only property remembers the original value for go.Shape.geometry, so that it can be restored if this tool is cancelled.

  • The maximum distance at which a resegmenting handle being positioned on a straight line between the adjacent points will cause one of the segments to be removed from the geometry. The default value is 3.

  • The name of the GraphObject to be reshaped. The default name is 'SHAPE'.


  • This tool may run when there is a mouse-down event on a reshape handle.

    Returns boolean

  • This is called by doMouseMove and doMouseUp to limit the input point before calling reshape. By default, this doesn't limit the input point.


    • p: Point

      the point where the handle is being dragged.

    Returns Point

  • Start reshaping, if findToolHandleAt finds a reshape handle at the mouse down point.

    If successful this sets handle to be the reshape handle that it finds and adornedShape to be the go.Shape being reshaped. It also remembers the original geometry in case this tool is cancelled. And it starts a transaction.

    Returns void

  • Restore the shape to be the original geometry and stop this tool.

    Returns void

  • This stops the current reshaping operation with the Shape as it is.

    Returns void

  • Call reshape with a new point determined by the mouse to change the geometry of the adornedShape.

    Returns void

  • Reshape the Shape's geometry with a point based on the most recent mouse point by calling reshape, and then stop this tool.

    Returns void