edu.mit.sketch.ddg
Class LineRelationshipConstraint

java.lang.Object
  |
  +--edu.mit.sketch.ddg.Constraint
        |
        +--edu.mit.sketch.ddg.LineRelationshipConstraint

public class LineRelationshipConstraint

extends Constraint

This class represents constraints between pairs of line primitives (like "connects"). The ObjectDescription will store several instances of this class representing different constraints, depending on what constraint name is passed to the constructor. For example, to record all the intersects constraints, instantiate this class passing the user strokes and the name INTERSECTS to the constructor. According to the name an appropriate function will be used to figure out which lines intersect. (An alternative way to implement this would be to create a separate subclass of Constraint for each constraint. I may change to the latter implementation)

LineRelationshipConstraint.java Created: Sat Nov 21 18:26:00 2001

Field Summary

static int	ABOVE_CENTERED
static int	ACUTE_ANGLE
static int	CONNECTS Possible cnstraints (note: numbers are used for iteration over these so the sequence has to be without gaps)
static int	CONNECTS_P1_P1
static int	CONNECTS_P1_P2
static int	CONNECTS_P2_P1
static int	CONNECTS_P2_P2
static int	INTERSECTS
static int	LONGER
protected int	m_name Name of the constraint
static int	MEETS
static int	MEETS_P1
static int	MEETS_P2
static int	MUCH_LONGER
static int	NUM_CONSTRAINTS Total number of possible constraints (to allow iterating over the names)
static int	OBTUSE_ANGLE
static int	PARALLEL
static int	PERPENDICULAR
static int	RIGHT_CENTERED
static int	SAME_LENGTH
static int	UPPER_LEFT
static int	UPPER_RIGHT

Fields inherited from class edu.mit.sketch.ddg.Constraint

m_constraintGraph

Constructor Summary

LineRelationshipConstraint()
Constructs an empty constraint graph.

LineRelationshipConstraint(HashMap primToGeomParts, Object name)
Constructs the constraint graph from and example drawn by the user.

Method Summary

void	inferConstraints(HashMap primToGeomParts) Infer the constraints from the users stroke geom parts and record the constraint graph into the hashtable.
String	name() Name of the constraint type.

Methods inherited from class edu.mit.sketch.ddg.Constraint

addHoldsBetween, confidence, constraintGraph, edgeList, holdsBetween, holdsBetween, print, relevance, removeHoldsBetween, removeLowConfidence, removeUncertain, setConfidence, setRelevance

Methods inherited from class java.lang.Object

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

Field Detail

m_name

protected int m_name

Name of the constraint

CONNECTS

public static final int CONNECTS

Possible cnstraints (note: numbers are used for iteration over these so the sequence has to be without gaps)

MEETS

public static final int MEETS

INTERSECTS

public static final int INTERSECTS

PARALLEL

public static final int PARALLEL

PERPENDICULAR

public static final int PERPENDICULAR

ABOVE_CENTERED

public static final int ABOVE_CENTERED

RIGHT_CENTERED

public static final int RIGHT_CENTERED

UPPER_RIGHT

public static final int UPPER_RIGHT

UPPER_LEFT

public static final int UPPER_LEFT

SAME_LENGTH

public static final int SAME_LENGTH

LONGER

public static final int LONGER

MUCH_LONGER

public static final int MUCH_LONGER

OBTUSE_ANGLE

public static final int OBTUSE_ANGLE

ACUTE_ANGLE

public static final int ACUTE_ANGLE

CONNECTS_P1_P1

public static final int CONNECTS_P1_P1

CONNECTS_P1_P2

public static final int CONNECTS_P1_P2

CONNECTS_P2_P1

public static final int CONNECTS_P2_P1

CONNECTS_P2_P2

public static final int CONNECTS_P2_P2

MEETS_P1

public static final int MEETS_P1

MEETS_P2

public static final int MEETS_P2

NUM_CONSTRAINTS

public static final int NUM_CONSTRAINTS

Total number of possible constraints (to allow iterating over the names)

Constructor Detail

LineRelationshipConstraint

public LineRelationshipConstraint()

Constructs an empty constraint graph.

LineRelationshipConstraint

public LineRelationshipConstraint(HashMap primToGeomParts,
                                  Object name)

Constructs the constraint graph from and example drawn by the user. The constraint is specified by the name. HashMap: type of key: Primitive, type of value: GeometricObject Type of name should be int.

Method Detail

inferConstraints

public void inferConstraints(HashMap primToGeomParts)

Infer the constraints from the users stroke geom parts and record the constraint graph into the hashtable. HashMap: type of key: Primitive, type of value: GeometricObject

Overrides:

inferConstraints in class Constraint

name

public String name()

Name of the constraint type.

Overrides:

name in class Constraint