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/*******************************************************************************
* prism.h
*
* This module contains all defines, typedefs, and prototypes for PRISM.CPP.
*
* ---------------------------------------------------------------------------
* Persistence of Vision Ray Tracer ('POV-Ray') version 3.7.
* Copyright 1991-2013 Persistence of Vision Raytracer Pty. Ltd.
*
* POV-Ray is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* POV-Ray is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* ---------------------------------------------------------------------------
* POV-Ray is based on the popular DKB raytracer version 2.12.
* DKBTrace was originally written by David K. Buck.
* DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
* ---------------------------------------------------------------------------
* $File: //depot/public/povray/3.x/source/backend/shape/prism.h $
* $Revision: #1 $
* $Change: 6069 $
* $DateTime: 2013/11/06 11:59:40 $
* $Author: chrisc $
*******************************************************************************/
#ifndef PRISM_H
#define PRISM_H
namespace pov
{
/*****************************************************************************
* Global preprocessor definitions
******************************************************************************/
#define PRISM_OBJECT (STURM_OK_OBJECT)
#define LINEAR_SPLINE 1
#define QUADRATIC_SPLINE 2
#define CUBIC_SPLINE 3
#define BEZIER_SPLINE 4
#define LINEAR_SWEEP 1
#define CONIC_SWEEP 2
/* Generate additional prism statistics. */
#define PRISM_EXTRA_STATS 1
/*****************************************************************************
* Global typedefs
******************************************************************************/
typedef struct Prism_Spline_Struct PRISM_SPLINE;
typedef struct Prism_Spline_Entry_Struct PRISM_SPLINE_ENTRY;
struct Prism_Spline_Entry_Struct
{
DBL x1, y1, x2, y2; /* Min./Max. coordinates of segment */
DBL v1, u2, v2; /* Min./Max. coordinates of segment in <u,v>, u1 not needed */
UV_VECT A, B, C, D; /* Coefficients of segment */
};
struct Prism_Spline_Struct
{
int References;
PRISM_SPLINE_ENTRY *Entry;
};
class Prism : public ObjectBase
{
public:
int Number;
int Spline_Type; /* Spline type (linear, quadratic ...) */
int Sweep_Type; /* Sweep type (linear, conic) */
DBL Height1, Height2;
DBL x1, y1, x2, y2; /* Overall bounding rectangle of spline curve */
PRISM_SPLINE *Spline; /* Pointer to array of splines */
DBL u1, v1, u2, v2; /* Overall <u,v> bounding rectangle of spline */
Prism();
virtual ~Prism();
virtual ObjectPtr Copy();
virtual bool All_Intersections(const Ray&, IStack&, TraceThreadData *);
virtual bool Inside(const VECTOR, TraceThreadData *) const;
virtual void Normal(VECTOR, Intersection *, TraceThreadData *) const;
virtual void Translate(const VECTOR, const TRANSFORM *);
virtual void Rotate(const VECTOR, const TRANSFORM *);
virtual void Scale(const VECTOR, const TRANSFORM *);
virtual void Transform(const TRANSFORM *);
virtual void Invert();
virtual void Compute_BBox();
void Compute_Prism(UV_VECT *P, TraceThreadData *Thread);
protected:
int in_curve(DBL u, DBL v, TraceThreadData *Thread) const;
static bool test_rectangle(const VECTOR P, const VECTOR D, DBL x1, DBL y1, DBL x2, DBL y2);
};
}
#endif
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