org.eclipse.gef4.geometry.planar

Class BezierCurve.IntervalPair

java.lang.Object

org.eclipse.gef4.geometry.planar.BezierCurve.IntervalPair

Enclosing class:

BezierCurve

public static final class BezierCurve.IntervalPair
extends java.lang.Object

An BezierCurve.IntervalPair combines two BezierCurves and their corresponding parameter ranges.

Field Summary

Fields

Modifier and Type	Field and Description
BezierCurve	p The first BezierCurve.
BezierCurve.Interval	pi The parameter BezierCurve.Interval for the first BezierCurve.
BezierCurve	q The second BezierCurve.
BezierCurve.Interval	qi The parameter BezierCurve.Interval for the second BezierCurve.

Constructor Summary

Constructors

Constructor and Description
IntervalPair(BezierCurve pp, BezierCurve.Interval pt, BezierCurve pq, BezierCurve.Interval pu) Constructs a new BezierCurve.IntervalPair with the given BezierCurves and their corresponding parameter ranges.

Method Summary

Modifier and Type	Method and Description
boolean	converges() Checks if both parameter BezierCurve.Intervals do converge (@see Interval#converges()) or both BezierCurves are degenerated, i.e. they are collapsed to a single Point.
boolean	converges(int shift) Checks if both parameter BezierCurve.Intervals do converge (@see Interval#converges(int)) or both BezierCurves are degenerated, i.e. they are collapsed to a single Point.
void	expand(BezierCurve.IntervalPair ip) Expands this BezierCurve.IntervalPair to include the given other BezierCurve.IntervalPair.
BezierCurve.IntervalPair	getCopy() Returns a copy of this BezierCurve.IntervalPair.
BezierCurve	getPClipped() Returns the first sub-curve of this BezierCurve.IntervalPair.
BezierCurve.IntervalPair[]	getPSplit() Splits the first parameter BezierCurve.Interval pi at half and returns the resulting BezierCurve.IntervalPairs.
BezierCurve	getQClipped() Returns the second sub-curve of this BezierCurve.IntervalPair.
BezierCurve.IntervalPair[]	getQSplit() Splits the second parameter BezierCurve.Interval qi at half and returns the resulting BezierCurve.IntervalPairs.
BezierCurve.IntervalPair	getSwapped() Creates a new BezierCurve.IntervalPair with swapped BezierCurves and their parameter BezierCurve.Intervals.
boolean	isPLonger() Calculates which BezierCurve's parameter BezierCurve.Interval is longer.

Methods inherited from class java.lang.Object

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

Field Detail

p

public BezierCurve p

The first BezierCurve.

q

public BezierCurve q

The second BezierCurve.

pi

public BezierCurve.Interval pi

The parameter BezierCurve.Interval for the first BezierCurve.

qi

public BezierCurve.Interval qi

The parameter BezierCurve.Interval for the second BezierCurve.

Constructor Detail

IntervalPair

public IntervalPair(BezierCurve pp,
                    BezierCurve.Interval pt,
                    BezierCurve pq,
                    BezierCurve.Interval pu)

Constructs a new BezierCurve.IntervalPair with the given BezierCurves and their corresponding parameter ranges.

Parameters:

pp - the first BezierCurve

pt - the parameter BezierCurve.Interval for the first BezierCurve

pq - the second BezierCurve

pu - the parameter BezierCurve.Interval for the second BezierCurve

Method Detail

converges

public boolean converges()

Checks if both parameter BezierCurve.Intervals do converge (@see Interval#converges()) or both BezierCurves are degenerated, i.e. they are collapsed to a single Point.

Returns:

true if both parameter BezierCurve.Intervals do converge, otherwise false

converges

public boolean converges(int shift)

Checks if both parameter BezierCurve.Intervals do converge (@see Interval#converges(int)) or both BezierCurves are degenerated, i.e. they are collapsed to a single Point.

Parameters:

shift - the precision shift

Returns:

true if both parameter BezierCurve.Intervals do converge, otherwise false

expand

public void expand(BezierCurve.IntervalPair ip)

Expands this BezierCurve.IntervalPair to include the given other BezierCurve.IntervalPair.

Parameters:

ip - The other BezierCurve.IntervalPair to which this is expanded.

getCopy

public BezierCurve.IntervalPair getCopy()

Returns a copy of this BezierCurve.IntervalPair. The underlying BezierCurves are only shallow copied. The corresponding parameter BezierCurve.Intervals, contrairwise, are truly copied.

Returns:

a copy of this BezierCurve.IntervalPair

getPClipped

public BezierCurve getPClipped()

Returns the first sub-curve of this BezierCurve.IntervalPair. This curve is the first BezierCurve p over its corresponding parameter BezierCurve.Interval pi.

Returns:

the first sub-curve of this BezierCurve.IntervalPair

getPSplit

public BezierCurve.IntervalPair[] getPSplit()

Splits the first parameter BezierCurve.Interval pi at half and returns the resulting BezierCurve.IntervalPairs.

Returns:

two BezierCurve.IntervalPairs representing a split of the first parameter BezierCurve.Interval at half

getQClipped

public BezierCurve getQClipped()

Returns the second sub-curve of this BezierCurve.IntervalPair. This curve is the second BezierCurve q over its corresponding parameter BezierCurve.Interval qi.

Returns:

the second sub-curve of this BezierCurve.IntervalPair

getQSplit

public BezierCurve.IntervalPair[] getQSplit()

Splits the second parameter BezierCurve.Interval qi at half and returns the resulting BezierCurve.IntervalPairs.

Returns:

two BezierCurve.IntervalPairs representing a split of the second parameter BezierCurve.Interval at half

getSwapped

public BezierCurve.IntervalPair getSwapped()

Creates a new BezierCurve.IntervalPair with swapped BezierCurves and their parameter BezierCurve.Intervals.

Returns:

a new BezierCurve.IntervalPair with swapped BezierCurves and their parameter BezierCurve.Intervals

isPLonger

public boolean isPLonger()

Calculates which BezierCurve's parameter BezierCurve.Interval is longer.

Returns:

true if the distance from start to end parameter value of the first parameter BezierCurve.Interval pi is greater than the distance from start to end parameter value of the second parameter BezierCurve.Interval qi. Othwise, returns false.