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euclid/EUC_Expression.h
/*
* Copyright (c) 2006
* Side Effects Software Inc. All rights reserved.
*
* Redistribution and use of Houdini Development Kit samples in source and
* binary forms, with or without modification, are permitted provided that the
* following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. The name of Side Effects Software may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY SIDE EFFECTS SOFTWARE `AS IS' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL SIDE EFFECTS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*----------------------------------------------------------------------------
* Defines the expressions that can be performed on sets of
* euclidean objects.
*/
#ifndef __EUC_Expression__
#define __EUC_Expression__
#include "EUC_Object.h"
#include <UT/UT_ValArray.h>
namespace HDK_Sample {
class EUC_Expression;
// Generic expression.
class EUC_Expression
{
public:
protected:
virtual ~EUC_Expression();
public:
// This is a refence counted object.
void addRef();
void removeRef();
// Each expression gets a global id which is constant for this
// runtime invocation. This lets one marshal an expression pointer
// as an id and safely determine if it still exists.
int getUid() const { return myUid; }
static EUC_Expression *getExprFromUid(int uid);
void applyLook(EUC_Object *obj);
void setLook(bool visible, const UT_Vector3 &cd);
// Evaluates the set of rules given, generating a bunch of
// EUC_Objects.
void evaluate(EUC_ObjectList &results);
protected:
// Evaluates this expression. Initializes result to the output
// of this expression. totalobj gets any net-new objects
// added to it.
virtual void evaluateSubclass(EUC_ObjectList &result,
EUC_ObjectList &totalobj) = 0;
public:
// Handles the recursive evaluation including caching the results
// so we don't evaluate an expression twice in a single invocation.
EUC_ObjectList &totalobj);
private:
int myRefCount;
int myUid;
// Our look for net-new objects
bool myVisible;
UT_Vector3 myCd;
// Global list of expressions
static EUC_ExpressionList ourExpressionList;
// Our cache of results
EUC_ObjectList myObjectCache;
int myLastEvaluateTime;
static int ourEvaluateTime;
};
// Creates a point.
class EUC_ExprPoint : public EUC_Expression
{
public:
protected:
virtual void evaluateSubclass(EUC_ObjectList &result,
EUC_ObjectList &totalobj);
protected:
};
// Creates a point from an object, extracting it as necessary.
class EUC_ExprPointFromObject : public EUC_Expression
{
public:
protected:
virtual void evaluateSubclass(EUC_ObjectList &result,
EUC_ObjectList &totalobj);
protected:
int myIndex;
};
// Creates a line from a pair of points
class EUC_ExprLineFromPoints : public EUC_Expression
{
public:
protected:
virtual void evaluateSubclass(EUC_ObjectList &result,
EUC_ObjectList &totalobj);
protected:
};
// Creates a circle from a pair of points
class EUC_ExprCircleFromPoints : public EUC_Expression
{
public:
protected:
virtual void evaluateSubclass(EUC_ObjectList &result,
EUC_ObjectList &totalobj);
protected:
};
// Intersects two objects.
class EUC_ExprIntersect : public EUC_Expression
{
public:
virtual ~EUC_ExprIntersect();
protected:
virtual void evaluateSubclass(EUC_ObjectList &result,
EUC_ObjectList &totalobj);
protected:
};
// Selects on object out of an expressions result list.
class EUC_ExprSelect : public EUC_Expression
{
public:
virtual ~EUC_ExprSelect();
protected:
virtual void evaluateSubclass(EUC_ObjectList &result,
EUC_ObjectList &totalobj);
protected:
int myIndex;
};
}
#endif