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#ifndef _SpatialConstraint_h
#define _SpatialConstraint_h
//# Filename: SpatialConstraint.h
//#
//# Classes defined here: SpatialConstraint SpatialSign
//#
//#
//# Author: Peter Z. Kunszt, based on A. Szalay's code
//#
//# Date: October 16, 1998
//#
//# SPDX-FileCopyrightText: 2000 Peter Z. Kunszt Alex S. Szalay, Aniruddha R. Thakar
//# The Johns Hopkins University
//#
//# Modification History:
//#
//# Oct 18, 2001 : Dennis C. Dinge -- Replaced ValVec with std::vector
//#
#include "SpatialGeneral.h"
#include "SpatialSign.h"
#include "SpatialVector.h"
//
//########################################################################
//#
//# Spatial Constraint class
//#
/**
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)
*/
class LINKAGE SpatialConstraint
{
public:
/// Constructor
SpatialConstraint(){};
/// Initialization constructor
SpatialConstraint(SpatialVector, float64);
/// check whether a vector is inside this
bool contains(const SpatialVector v);
/// give back vector
SpatialVector &v() { return a_; }
private:
Sign sign_;
SpatialVector a_; // normal vector
float64 d_; // distance from origin
float64 s_; // cone angle in radians
friend class RangeConvex;
};
#endif
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