Using the Lock Tool

Using the Lock Tool

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By default, when you drag points in a Geometry Expressions model, it will adjust the numerical sample values used in the various parameters of the model to accommodate the drag, as best it can.

For example, in the model of a 4 bar linkage below, dragging point B will cause lengths a and b and angle θ to be adjusted appropriately.

Lock_Tool_example 

However, you may want the drag to act as if the members AB and BC were rigid, and only angle theta adjustable. To do this you can lock the parameters:

locking 

The value of a, for example, can still be set from the Variables panel, but it will not change when the model is dragged.