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// $Id$
//
// Cassowary Incremental Constraint Solver
// Original Smalltalk Implementation by Alan Borning
// This C++ Implementation by Greg J. Badros, <gjb@cs.washington.edu>
// http://www.cs.washington.edu/homes/gjb
// (C) 1998, 1999 Greg J. Badros and Alan Borning
// See ../LICENSE for legal details regarding this software
//
// ClFDBinaryOneWayConstraint.h
#ifndef ClFDBinaryOneWayConstraint_H
#define ClFDBinaryOneWayConstraint_H
#if defined(HAVE_CONFIG_H) && !defined(CONFIG_H_INCLUDED) && !defined(CONFIG_INLINE_H_INCLUDED)
#include <cassowary/config-inline.h>
#define CONFIG_INLINE_H_INCLUDED
#endif
#include "Cassowary.h"
#include "ClFDConstraint.h"
class ClLinearConstraint;
// Just a node in the class hierarchy for now
class ClFDBinaryOneWayConstraint : public ClFDConstraint {
private: typedef ClFDConstraint super;
public:
ClFDBinaryOneWayConstraint(ClVariable vRW, enum ClCnRelation rel, ClVariable vRO,
double coefficient = 1.0, double constant = 0.0,
const ClStrength &strength = ClsRequired(),
double weight = 1.0)
: ClFDConstraint(strength,weight), _vRW(vRW), _rel(rel), _vRO(vRO),
_coefficient(coefficient), _constant(constant)
{ }
ClFDBinaryOneWayConstraint(ClVariable vRW, enum ClCnRelation rel, double constant,
const ClStrength &strength = ClsRequired(),
double weight = 1.0)
: ClFDConstraint(strength,weight), _vRW(vRW), _rel(rel), _vRO(clvNil),
_coefficient(0), _constant(constant)
{ }
ClFDBinaryOneWayConstraint(const ClConstraint &cn);
static void EnsurePreconditionsForCn(const ClConstraint &cn);
static bool FCanConvertCn(const ClConstraint &cn);
#ifndef CL_NO_IO
virtual ostream &PrintOn(ostream &xo) const
{
xo << "FDCn: " << _vRW << " " << StrCnRelation(_rel) << " ";
if (_coefficient != 0) {
if (_coefficient != 1) xo << _coefficient << "*";
if (_vRO != clvNil) xo << _vRO;
}
if (_constant != 0) xo << " + " << _constant;
return xo;
}
friend ostream& operator<<(ostream &xos, const ClFDBinaryOneWayConstraint &constraint)
{ return constraint.PrintOn(xos); }
#endif
ClVariable ClvRW() const
{ return _vRW; }
ClVariable ClvRO() const
{ return _vRO; }
enum ClCnRelation Relation() const
{ return _rel; }
double Coefficient() const
{ return _coefficient; }
double Constant() const
{ return _constant; }
bool IsInequality() const
{ return (_rel != cnEQ && _rel != cnNEQ); }
bool IsStrictInequality() const
{ return (_rel == cnGT || _rel == cnLT); }
protected:
ClVariable _vRW;
enum ClCnRelation _rel;
ClVariable _vRO;
double _coefficient;
double _constant;
};
#endif
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