edu.jhu.htm.core
Class Constraint

java.lang.Object
  |
  +--edu.jhu.htm.core.Sign
        |
        +--edu.jhu.htm.core.Constraint

public class Constraint

extends Sign

The Constraint is really a cone on the sky-sphere. It is characterized by its direction a_, the opening angle s_ and its cosine -- the distance of the plane intersecting the sphere and the sphere center. If d_ = 0, we have a half-sphere. If it is negative, we have a 'hole' i.e. the room angle is larger than 90degrees. Example: positive distance

 .                   ____
 .                ---    ---
 .               /        /|\
 .              /        / |=\
 .             |        /  |==|     this side is in the convex.
 .            |        /\s |===|
 .            |------------|---| -> direction a
 .            |        \   |===|
 .             |        \  |==|
 .              \        \ |=/
 .               \        \|/
 .                ---____---
 .
 .
 .                     <-d-> is positive (s < 90)
 
    

Example: negative distance

 .                   ____
 .                ---====---
 .  this side is /========/|\
 .  in the      /========/=| \
 .  convex     |==== s__/==|  |
 .            |===== / /===|   |
 .  dir. a <- |------------|---|  'hole' in the sphere
 .            |========\===|   |
 .             |========\==|  |
 .              \========\=| /
 .               \========\|/
 .                ---____---
 .
 .
 .                     <-d-> is negative (s > 90)
 

for d=0 we have a half-sphere. Combining such, we get triangles, rectangles etc on the sphere surface (pure ZERO convexes)

  Current Version
  ===============
  ID:	$Id: Constraint.java,v 1.3 2003/02/19 15:46:11 womullan Exp $
  Revision: 	$Revision: 1.3 $
  Date/time:	$Date: 2003/02/19 15:46:11 $
 

Version:

$Revision: 1.3 $

Author:

Wil

Field Summary

Vector3d	a_
double	d_
double	s_

Fields inherited from class edu.jhu.htm.core.Sign

mIXED, nEG, pOS, sign_, zERO

Constructor Summary

Constraint()
Default Constructor

Constraint(Constraint copy)
Copy constructor

Constraint(double distance)
Construct by setting only the distance

Constraint(double x, double y, double z, double distance)
Initialization constructor

Constraint(Vector3d vector, double distance)
Initialization constructor

Method Summary

boolean	contains(Vector3d vector) check whether a vector is inside this constraint
double	d() give back distance
void	invert() Invert a constraint
java.lang.String	toString() convert data to string
Vector3d	v() give back constraint direction

Methods inherited from class edu.jhu.htm.core.Sign

printSign

Methods inherited from class java.lang.Object

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

Field Detail

a_

public Vector3d a_

d_

public double d_

s_

public double s_

Constructor Detail

Constraint

public Constraint()

Default Constructor

Constraint

public Constraint(double distance)

Construct by setting only the distance

Parameters:

distance - set the distance to the cap

Constraint

public Constraint(Vector3d vector,
                  double distance)

Initialization constructor

Parameters:

vector - Vector3d specifying the direction of the cap

distance - The distance of the cutting plane from the origin

Constraint

public Constraint(double x,
                  double y,
                  double z,
                  double distance)

Initialization constructor

Parameters:

x - x-direction of vector specifying the direction of the cap

y - y-direction of vector specifying the direction of the cap

z - z-direction of vector specifying the direction of the cap

distance - The distance of the cutting plane from the origin

Constraint

public Constraint(Constraint copy)

Copy constructor

Method Detail

invert

public void invert()

Invert a constraint

contains

public boolean contains(Vector3d vector)

check whether a vector is inside this constraint

Parameters:

vector - Vector3d to be checked

Returns:

True if inside constraint, False if outside

v

public Vector3d v()

give back constraint direction

Returns:

Vector3d of constraint direction

d

public double d()

give back distance

Returns:

distance from origin

toString

public java.lang.String toString()

convert data to string

Overrides:

toString in class java.lang.Object

Returns:

string containing vector and distance (4 numbers)