Package com.graphbuilder.curve

Class ParametricCurve

java.lang.Object

com.graphbuilder.curve.Curve

com.graphbuilder.curve.ParametricCurve

Direct Known Subclasses:

BezierCurve, BSpline, CardinalSpline, CatmullRomSpline, CubicBSpline, LagrangeCurve, NaturalCubicSpline

public abstract class ParametricCurve
extends Curve

Curves that extend the ParametricCurve class are continuous and can use the BinaryCurveApproximationAlgorithm class to generate a sequence of points that approximate the curve. Note: Approximate means a finite set of points that are on the curve, not close to the curve.

See Also:

• BinaryCurveApproximationAlgorithm
• Curve

Field Summary

Fields inherited from class com.graphbuilder.curve.Curve

connect, cp, gi

Constructor Summary

Constructors

Constructor	Description
ParametricCurve(ControlPath cp, GroupIterator gp)

Method Summary

Modifier and Type	Method	Description
protected abstract void	eval(double[] p)	The eval method evaluates a point on a curve given a parametric value "t".
abstract int	getSampleLimit()	The sample limit specifies how many additional subdivisions are done to ensure that there are no missed pieces of the curve.

Methods inherited from class com.graphbuilder.curve.Curve

appendTo, getConnect, getControlPath, getGroupIterator, resetMemory, setConnect, setControlPath, setGroupIterator

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ParametricCurve

public ParametricCurve(ControlPath cp,
 GroupIterator gp)

Method Details

eval

protected abstract void eval(double[] p)

The eval method evaluates a point on a curve given a parametric value "t". The parametric value "t" is stored in the last index location of the specified double array. This value should not be changed. The dimension of the point to evaluate is p.length - 1. The result of the evaluation is placed in index locations 0 .. p.length - 2 (inclusive). The eval method should remain protected except for those curves that do no need any preparation to be done in the appendTo method.

getSampleLimit

public abstract int getSampleLimit()

The sample limit specifies how many additional subdivisions are done to ensure that there are no missed pieces of the curve. The sample limit must be >= 0.