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Issue No.05 - September/October (1993 vol.13)
pp: 43-49
<p>Alternative techniques for control-vertex manipulation of parametric curves are described. Their generality and flexibility make possible a wide range of curve-editing interfaces based on direct manipulation. A method for applying systems of constraints at one or more arbitrary points on a single or composite curve and an efficient technique for the interactive application of these systems are outlined. Analytic solutions and examples for useful systems of constraints are presented.</p>
Barry Fowler, Richard Bartels, "Constraint-Based Curve Manipulation", IEEE Computer Graphics and Applications, vol.13, no. 5, pp. 43-49, September/October 1993, doi:10.1109/38.232098
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