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Implementation of various mathematical curves that define themselves over a set of control points. The API is written in Java. The curves supported are: Bezier, B-Spline, Cardinal Spline, Catmull-Rom Spline, Lagrange, Natural Cubic Spline, and NURBS.

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package com.graphbuilder.math;

/**
A node of an expression tree that represents a variable.  A VarNode cannot have any children.
*/
public class VarNode extends TermNode {

	public VarNode(String name, boolean negate) {
		super(name, negate);
	}

	/**
	Returns the value associated with the variable name in the VarMap.
	*/
	public double eval(VarMap v, FuncMap f) {
		double val = v.getValue(name);

		if (negate) val = -val;

		return val;
	}
}