There are a number of constraints available on B-spline curves. Their placement and behavior is similar to the constraints available for other graphic objects in the software.
The following constraints are available on B-spline curves:
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Point on element
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End Point
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Perpendicular (going into and out of the curve)
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Tangent (going into and out of the curve)
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The software applies the tangent and orthogonal constraints according to the quadrant of the circular glyph through which the pointer exits.