org.gvsig.vectorediting.lib.prov.extendline.operation

Class ExtendLineOperationUtils

java.lang.Object

org.gvsig.vectorediting.lib.prov.extendline.operation.ExtendLineOperationUtils

public class ExtendLineOperationUtils
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static String	END_SIDE Use it to indicate end side should be extended
static String	START_SIDE Use it to indicate start side should be extended

Constructor Summary

Constructors

Constructor and Description
ExtendLineOperationUtils()

Method Summary

Modifier and Type	Method and Description
static Point	arcIntersection(Arc arcToBeExtended, String sideToExtend, FeatureSelection boundaryObjects) Calculates the nearest intersection point among arc and boundary objects depending on side received as parameter.
static Point	curveIntersection(Curve line, String sideToExtend, FeatureSelection boundaryObjects) Calculates the nearest intersection among curve and boundary objects depending on side received as parameter.
static double	getAngle(Point start, Point end)
static Point	getIntersectionOfProjectedLine(Point initPoint, Point endPoint, FeatureSelection boundaryObjects) Gets intersection among the line formed by initPoint and endPoint and boundary objects.
static ExtendLineOperation	getOperation(Primitive geom)
static void	register(ExtendLineOperation operation, int geometryType)

Methods inherited from class java.lang.Object

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

Field Detail

START_SIDE

public static final String START_SIDE

Use it to indicate start side should be extended

See Also:

Constant Field Values

END_SIDE

public static final String END_SIDE

Use it to indicate end side should be extended

See Also:

Constant Field Values

Constructor Detail

ExtendLineOperationUtils

public ExtendLineOperationUtils()

Method Detail

register

public static void register(ExtendLineOperation operation,
                            int geometryType)

getOperation

public static ExtendLineOperation getOperation(Primitive geom)

curveIntersection

public static Point curveIntersection(Curve line,
                                      String sideToExtend,
                                      FeatureSelection boundaryObjects)
                               throws CreateGeometryException,
                                      DataException,
                                      GeometryOperationNotSupportedException,
                                      GeometryOperationException

Calculates the nearest intersection among curve and boundary objects depending on side received as parameter.

Parameters:

line - to be extended

sideToExtend - What side will be extend. Use START_SIDE and END_SIDE

boundaryObjects - to calculate intersection points.

Returns:

the nearest intersection point. Return Null if arc does not intersect with any boundary object

Throws:

CreateGeometryException

DataException

GeometryOperationNotSupportedException

GeometryOperationException

arcIntersection

public static Point arcIntersection(Arc arcToBeExtended,
                                    String sideToExtend,
                                    FeatureSelection boundaryObjects)
                             throws GeometryOperationNotSupportedException,
                                    GeometryOperationException,
                                    CreateGeometryException,
                                    DataException

Calculates the nearest intersection point among arc and boundary objects depending on side received as parameter. Strategy: 1- Create a full arc with the same center and radius of arc received by parameter. 2- Iterate over boundary objects. 3- If some boundary object intersects with full arc, calculates the distance to start point or end point depending on side to be extend. 4- Return the nearest intersection point.

Parameters:

arcToBeExtended - Arc to be extended

sideToExtend - What side will be extend. Use START_SIDE and END_SIDE

boundaryObjects - to calculate intersection points.

Returns:

the nearest intersection point. Return Null if arc does not intersect with any boundary object

Throws:

GeometryOperationNotSupportedException

GeometryOperationException

CreateGeometryException

DataException

getAngle

public static double getAngle(Point start,
                              Point end)
                       throws GeometryOperationNotSupportedException,
                              GeometryOperationException

Throws:

GeometryOperationNotSupportedException

GeometryOperationException

getIntersectionOfProjectedLine

public static Point getIntersectionOfProjectedLine(Point initPoint,
                                                   Point endPoint,
                                                   FeatureSelection boundaryObjects)
                                            throws GeometryOperationNotSupportedException,
                                                   GeometryOperationException,
                                                   DataException,
                                                   CreateGeometryException

Gets intersection among the line formed by initPoint and endPoint and boundary objects. If line or its projection does not intersect with any boundary object return null. Strategy: 1- Get module of line to determine if an intersection point already be vertex of line. If the distance between intersection point and start point of line is less than module indicates that intersection point already be curve point. 2- Project line with the line parametric equation. 3- Iterate over boundary objects. 4- Check if boundary object does not contains end point of projected line. 5- If projected line intersects with any boundary object, get the nearest intersection point 6- Return it.

Parameters:

initPoint - of curve to extend

endPoint - end point of curve to extend

boundaryObjects - to calculate intersection points.

Returns:

the nearest intersection point. Return Null if arc does not intersect with any boundary object

Throws:

GeometryOperationNotSupportedException

GeometryOperationException

DataException

CreateGeometryException