Package com.luciad.shape.shape2D

Class TLcdXYFloatPolyline

java.lang.Object

com.luciad.shape.ALcdShape

com.luciad.shape.shape2D.ALcd2DEditableShape

com.luciad.shape.shape2D.ALcd2DEditableFloatPolypoint

com.luciad.shape.shape2D.TLcdXYFloatPolyline

All Implemented Interfaces:

ILcdBounded, ILcdCurve, ILcdPointList, ILcdPolyline, ILcdPolypoint, ILcdShape, ILcd2DEditablePointList, ILcd2DEditablePolyline, ILcd2DEditablePolypoint, ILcd2DEditableShape, ILcdCloneable, Serializable, Cloneable

Direct Known Subclasses:

TLcdDGNFloatCurve2D, TLcdDGNFloatLineString2D, TLcdXYFloatPolylineCache

public class TLcdXYFloatPolyline
extends ALcd2DEditableFloatPolypoint
implements ILcd2DEditablePolyline, ILcdCurve

This class provides an implementation of ILcd2DEditablePolyline in the cartesian space.

It uses an array of floats instead of a TLcd2DEditablePointList of ILcd2DEditablePoint objects. A single array of floats stores the 2D coordinates. The points are stored as (x,y) pairs.

The boolean indicates whether the last 4 places in the array can be used to store the bounds of the ILcd2DEditablePolyline.

This class is thread-safe for read-only access.

See Also:

• Serialized Form

Field Summary

Fields inherited from interface com.luciad.shape.ILcdCurve

INTERPOLATION_CIRCLE_BY_3POINTS, INTERPOLATION_CIRCLE_BY_CENTERPOINT, INTERPOLATION_CIRCULARARC_BY_3POINTS, INTERPOLATION_CIRCULARARC_BY_BULGE, INTERPOLATION_CIRCULARARC_BY_CENTERPOINT, INTERPOLATION_ELLIPTICAL, INTERPOLATION_GEODESIC, INTERPOLATION_LINEAR, INTERPOLATION_MIXED, INTERPOLATION_RHUMB

Constructor Summary

Constructors

Constructor	Description
TLcdXYFloatPolyline()
TLcdXYFloatPolyline(float[] aPoints, boolean aHasBounds, boolean aBoundsInitialized, boolean aClone)
TLcdXYFloatPolyline(TLcdXYFloatPolyline aXYFloatPolyline)

Method Summary

Modifier and Type	Method	Description
Object	clone()	Creates and returns a copy of this object, by delegating to Object.clone().
void	computePointSFCT(double aParam, ILcd3DEditablePoint aPointSFCT)	Computes a point of the curve, defined by the given parameter.
boolean	contains2D(double aX, double aY)	Checks if the point (aX,aY) lies on one of the line segments of the TLcdXYPolyline.
protected ILcd2DEditableBounds	createBounds()	Creates an uninitialized ILcd2DEditableBounds object of a type compatible with the concrete implementation of this class.
protected ILcd2DEditablePoint	createPoint()	Creates an uninitialized ILcd2DEditablePoint point of a type compatible with the concrete implementation of this class (geodesic/cartesian).
ILcdPoint	getEndPoint()	Retrieves the end point of the curve.
double	getEndTangent2D()	Returns the angle of the curve's tangent at the end point, in degrees counterclockwise from the direction at 3 o'clock.
String	getInterpolation()	Returns the interpolation method used by this curve.
double	getLength2D(double aParam1, double aParam2)	Returns the length between two points of the curve, defined by the given parameters.
int	getLineSegmentIntersectionCount(ILcdPoint aP1, ILcdPoint aP2)	Returns the number of intersections between this curve and a line segment defined by the two specified points.
ILcdPoint	getStartPoint()	Retrieves the start point of the curve.
double	getStartTangent2D()	Returns the angle of the curve's tangent at the start point, in degrees counterclockwise from the direction at 3 o'clock.
double	getTangent2D(double aParam)	Returns the angle of the curve's tangent in the point defined by the given parameter, in degrees counterclockwise from the direction at 3 o'clock.

Methods inherited from class com.luciad.shape.shape2D.ALcd2DEditableFloatPolypoint

calculateBounds, calculateFocusPoint, equals, getBounds, getFocusPoint, getPoint, getPointCount, hashCode, insert2DPoint, invalidate, move2D, move2DPoint, removePointAt, translate2D, translate2DPoint

Methods inherited from class com.luciad.shape.shape2D.ALcd2DEditableShape

contains3D, move2D

Methods inherited from class com.luciad.shape.ALcdShape

contains2D, contains3D, fromDomainObject

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.luciad.shape.shape2D.ILcd2DEditablePointList

append2DPoint, insert2DPoint, move2DPoint, removePointAt, translate2D, translate2DPoint

Methods inherited from interface com.luciad.shape.shape2D.ILcd2DEditableShape

move2D, move2D, translate2D

Methods inherited from interface com.luciad.shape.ILcdBounded

getBounds

Methods inherited from interface com.luciad.shape.ILcdPointList

getPoint, getPointCount, getPointSFCT, getX, getY, getZ

Methods inherited from interface com.luciad.shape.ILcdShape

contains2D, contains3D, contains3D, getFocusPoint

Constructor Details

TLcdXYFloatPolyline

public TLcdXYFloatPolyline()

TLcdXYFloatPolyline

public TLcdXYFloatPolyline(float[] aPoints,
 boolean aHasBounds,
 boolean aBoundsInitialized,
 boolean aClone)

TLcdXYFloatPolyline

public TLcdXYFloatPolyline(TLcdXYFloatPolyline aXYFloatPolyline)

Method Details

contains2D

public boolean contains2D(double aX,
 double aY)

Checks if the point (aX,aY) lies on one of the line segments of the TLcdXYPolyline.

Specified by:

contains2D in interface ILcdShape

Overrides:

contains2D in class ALcd2DEditableFloatPolypoint

Parameters:

aX - the x coordinate of the point.

aY - the y coordinate of the point.

Returns:

the boolean result of the containment test.

createPoint

protected ILcd2DEditablePoint createPoint()

Description copied from class: ALcd2DEditableFloatPolypoint

Creates an uninitialized ILcd2DEditablePoint point of a type compatible with the concrete implementation of this class (geodesic/cartesian). The created point will be updated and returned by the ALcd2DEditableFloatPolypoint.getPoint(int) and ALcd2DEditableFloatPolypoint.getFocusPoint() methods.

Specified by:

createPoint in class ALcd2DEditableFloatPolypoint

createBounds

protected ILcd2DEditableBounds createBounds()

Description copied from class: ALcd2DEditableFloatPolypoint

Creates an uninitialized ILcd2DEditableBounds object of a type compatible with the concrete implementation of this class. This bounds object will be updated and returned by the ALcd2DEditableFloatPolypoint.getBounds() method.

Specified by:

createBounds in class ALcd2DEditableFloatPolypoint

clone

public Object clone()

Description copied from class: ALcdShape

Creates and returns a copy of this object, by delegating to Object.clone(). Extensions should delegate to this implementation with super.clone(), in order to create an object instance of the right type, with all fields copied. They then should explicitly clone any non-primitive fields for which a deeper clone is required.

Specified by:

clone in interface ILcdCloneable

Overrides:

clone in class ALcd2DEditableFloatPolypoint

See Also:

• Object.clone()

computePointSFCT

public void computePointSFCT(double aParam,
 ILcd3DEditablePoint aPointSFCT)

Description copied from interface: ILcdCurve

Computes a point of the curve, defined by the given parameter.

• At parameter 0, the point is the same as ILcdCurve.getStartPoint().
• At parameter 1, the point is the same as ILcdCurve.getEndPoint().

Specified by:

computePointSFCT in interface ILcdCurve

Parameters:

aParam - a value of the closed interval [0,1]

aPointSFCT - the point to store the computed curve point in

getEndPoint

public ILcdPoint getEndPoint()

Description copied from interface: ILcdCurve

Retrieves the end point of the curve.

This is equivalent to computePointSFCT(1).

Specified by:

getEndPoint in interface ILcdCurve

Returns:

the end point of the curve

getEndTangent2D

public double getEndTangent2D()

Description copied from interface: ILcdCurve

Returns the angle of the curve's tangent at the end point, in degrees counterclockwise from the direction at 3 o'clock.

The tangent orientation is from the end point, away from the curve before it.

This is the same as getTangent2D(1).

Specified by:

getEndTangent2D in interface ILcdCurve

Returns:

the curve's angle in the end point

getInterpolation

public String getInterpolation()

Description copied from interface: ILcdCurve

Returns the interpolation method used by this curve.

A set of predefined constants are defined in this interface, which are used by the default ILcdCurve implementations provided by LuciadLightspeed.

Custom implementations can define their own constants, and use them to interpret the interpolation of the curve.

Specified by:

getInterpolation in interface ILcdCurve

Returns:

the interpolation method used by this curve.

getLength2D

public double getLength2D(double aParam1,
 double aParam2)

Description copied from interface: ILcdCurve

Returns the length between two points of the curve, defined by the given parameters.

• When aParam1 == aParam2, the length is 0.
• When aParam1 == 0 and aParam2 == 1, the length is the whole length of the curve.
• When aParam1 > aParam2, the length is (aParam1 to 1) + (0 to aParam2).

Specified by:

getLength2D in interface ILcdCurve

Parameters:

aParam1 - a value of the closed interval [0,1]

aParam2 - a value of the closed interval [0,1]

Returns:

the length of the curve.

getLineSegmentIntersectionCount

public int getLineSegmentIntersectionCount(ILcdPoint aP1,
 ILcdPoint aP2)

Description copied from interface: ILcdCurve

Returns the number of intersections between this curve and a line segment defined by the two specified points.

This information can be used to perform containment calculations, if this curve is closed or if this curve is part of a composite closed curve. By determining the number of intersections between this curve and a line segment starting from a given point in a fixed direction, one can determine whether a point is located within the closed curve by using the even-odd rule.

Specified by:

getLineSegmentIntersectionCount in interface ILcdCurve

Parameters:

aP1 - the first point of the line segment

aP2 - the second point of the line segment

Returns:

the number of intersections between the curve and the line segment

getStartPoint

public ILcdPoint getStartPoint()

Description copied from interface: ILcdCurve

Retrieves the start point of the curve.

This is equivalent to computePointSFCT(0).

Specified by:

getStartPoint in interface ILcdCurve

Returns:

the start point of the curve

getStartTangent2D

public double getStartTangent2D()

Description copied from interface: ILcdCurve

Returns the angle of the curve's tangent at the start point, in degrees counterclockwise from the direction at 3 o'clock.

The tangent orientation is from the start point towards the rest of the shape.

This is the same as getTangent2D(0).

Specified by:

getStartTangent2D in interface ILcdCurve

Returns:

the curve's angle in the start point

getTangent2D

public double getTangent2D(double aParam)

Description copied from interface: ILcdCurve

Returns the angle of the curve's tangent in the point defined by the given parameter, in degrees counterclockwise from the direction at 3 o'clock.

The tangent orientation is from the point at parameter aParam towards the rest of the shape.

• The tangent at parameter 0 is the same as ILcdCurve.getStartTangent2D().
• The tangent at parameter 1 is the same as ILcdCurve.getEndTangent2D().

Specified by:

getTangent2D in interface ILcdCurve

Parameters:

aParam - a value of the closed interval [0,1]

Returns:

the curve's angle in the point defined by the given parameter