draw
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tmpvar
Dimension object
Provide a way to represent a dimension helper
_api signature
Dimension(a, b, value)
Creates a dimension between a and b and binds to their .change emitter. When either changes, or the dimension changes via .val(), update the appropriate things
val([val])
get/set value
remove()
remove this dimension
render(ctx)
renders a visual representation of the dimension
undo manager support will need to be added. when a user undoes the addition of a dimension, we will want to restore a/b to their original location.
