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GetPointEnableSnapToCurves Method
If you want GetPoint() to try to snap to curves when the mouse is near a curve (like the center point in the Circle command when the AroundCurve option is on), then enable the snap to curves option.

Namespace: Rhino.Input.Custom
Assembly: RhinoCommon (in RhinoCommon.dll) Version: 5.1.50000.0 (5.0.20693.0)
Syntax
public void EnableSnapToCurves(
	bool enable
)

Parameters

enable
Type: SystemBoolean
Whether points should be enabled.
See Also