EmptyValue.cpp

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// EmptyValue.cpp: implementation of the CEmptyValue class.
/*
 * Copyright (c) 1996-2000 Erwin Coumans <coockie@acm.org>
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Erwin Coumans makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 */

#include "EmptyValue.h"
#include "IntValue.h"
#include "FloatValue.h"
#include "StringValue.h"
#include "ErrorValue.h"
#include "ListValue.h"
#include "VoidValue.h"

// Construction/Destruction

CEmptyValue::CEmptyValue()
/*
pre:
effect: constructs a new CEmptyValue
*/
{
    SetModified(false);
}



CEmptyValue::~CEmptyValue()
/*
pre:
effect: deletes the object
*/
{

}



CValue * CEmptyValue::Calc(VALUE_OPERATOR op, CValue * val)
/*
pre:
ret: a new object containing the result of applying operator op to this
object and val
*/
{
    return val->CalcFinal(VALUE_EMPTY_TYPE, op, this);
    
}



CValue * CEmptyValue::CalcFinal(VALUE_DATA_TYPE dtype, VALUE_OPERATOR op, CValue * val)
/*
pre: the type of val is dtype
ret: a new object containing the result of applying operator op to val and
this object
*/
{
    return val->AddRef();
}



double CEmptyValue::GetNumber()
{
    return 0;
}



CListValue* CEmptyValue::GetPolySoup()
{
    CListValue* soup = new CListValue();
    //don't add any poly, while it's an empty value
    return soup;
}



bool CEmptyValue::IsInside(CValue* testpoint,bool bBorderInclude)
{
    // empty space is solid, so always inside
    return true;
}



double* CEmptyValue::GetVector3(bool bGetTransformedVec)
{ 
    assertd(false); // don't get vector from me
    return ZeroVector();
}



static STR_String emptyString = STR_String("");


const STR_String & CEmptyValue::GetText()
{
    return emptyString;
}



CValue* CEmptyValue::GetReplica()
{ 
    CEmptyValue* replica = new CEmptyValue(*this);
    replica->ProcessReplica();
    return replica;
}