Inventor/engines/SoInterpolate.h

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/*=======================================================================
** Author      : Ronen Barzel (MMM yyyy)
**=======================================================================*/
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/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/


#ifndef  _SO_INTERPOLATE_
#define  _SO_INTERPOLATE_

#include <Inventor/SoDB.h>
#include <Inventor/engines/SoSubEngine.h>
#include <Inventor/fields/SoSFFloat.h>
#include <Inventor/fields/SoMFFloat.h>
#include <Inventor/fields/SoMFRotation.h>
#include <Inventor/fields/SoMFVec2f.h>
#include <Inventor/fields/SoMFVec2i32.h>
#include <Inventor/fields/SoMFVec2s.h>
#include <Inventor/fields/SoMFVec3f.h>
#include <Inventor/fields/SoMFVec4f.h>

//
//  Class: SoInterpolate
//
//  Abstract base class for all interpolater engines. An interpolater
//  engine interpolates linearly between two values, based on "alpha"
//  between 0 and 1.
//

class  SoInterpolate : public SoEngine {

  SO_ENGINE_ABSTRACT_HEADER(SoInterpolate);

 public:
  SoSFFloat           alpha;
  SoEngineOutput      output;

 private:
  static void         initClass();
  static void exitClass();
  static void         initClasses();  // init all builtin derived classes
  static void exitClasses();

 private:
  SoInterpolate();

  static int findMax(int a, int b) { return (a > b) ? a : b; }
  static int clamp(int i, int n) { return (i < n) ? i : n-1; }

  ~SoInterpolate();
};

//
// These macros can be used to easily define interpolater engine
// headers and source.
//

//
// This macro is to be used within the class definition header. It
// declares variables and methods that all interpolaters support
//

#define SO_INTERPOLATE_HEADER(className)                                \
                                                                        \
    SO_ENGINE_HEADER(className);                                        \
                                                                        \
  private:                                                            \
    ~className();                                                       \
                                                                  \
    virtual void        evaluate();                                     \
                                                                        \
 private:\
    static void         initClass();                                    \
    static void         exitClass();                                    \
                                                                        \
  public:                                                               \
                                                  \
    className()

//
// This macro is to be used within the class source. It defines the
// variables and methods declared in SO_INTERPOLATE_HEADER().
// The "interpVal" argument should be an expression that returns
// the interpolation between local variables "v0" and "v1" of type
// "valType", based on local variable "a" which is a float.
//

#define SO_INTERPOLATE_SOURCE(className, type,                          \
                        valType, defaultVal0, defaultVal1, interpVal)   \
                                                                        \
SO_ENGINE_SOURCE(className)/*;*/                                                \
                                                                        \
className::className()                                                  \
{                                                                       \
    SO_ENGINE_CONSTRUCTOR(className);                                   \
    SO_ENGINE_ADD_INPUT(alpha, (0.0));                                  \
    SO_ENGINE_ADD_INPUT(input0, defaultVal0);                           \
    SO_ENGINE_ADD_INPUT(input1, defaultVal1);                           \
    SO_ENGINE_ADD_OUTPUT(output, type);                                 \
    isBuiltIn = TRUE;                                                   \
}                                                                       \
                                                                        \
className::~className()                                                 \
{                                                                       \
}                                                                       \
                                                                        \
void                                                                    \
className::evaluate()                                                   \
{                                                                       \
    int n0 = input0.getNum();                                           \
    int n1 = input1.getNum();                                           \
    float a = alpha.getValue();                                         \
    for (int i=findMax(n0,n1)-1; i>=0; i--) {                           \
        valType v0 = input0[clamp(i,n0)];                               \
        valType v1 = input1[clamp(i,n1)];                               \
        SO_ENGINE_OUTPUT(output, type, set1Value(i, interpVal));        \
    }                                                                   \
}

//
// This macro defines the initClass method for Interpolators.  It is
// separate from the _SOURCE macro so that we can put all of the
// engine's initClass methods near each other to reduce the number of
// pages touched on startup (decreasing startup time and the amount of
// memory used).
//

#define SO_INTERPOLATE_INITCLASS(className, classPrintName)             \
                                                                        \
void                                                                    \
className::initClass()                                                  \
{                                                                       \
    SO__ENGINE_INIT_CLASS(className, classPrintName, SoInterpolate);    \
}

#define SO_INTERPOLATE_EXITCLASS(className)             \
                                                                        \
void                                                                    \
className::exitClass()                                                  \
{                                                                       \
    SO_ENGINE_EXIT_CLASS(className);    \
}

//
// Interpolaters for the builtin field types.
//

class  SoInterpolateFloat : public SoInterpolate {
  SO_INTERPOLATE_HEADER(SoInterpolateFloat);
 public:                                
  SoMFFloat           input0;

  SoMFFloat           input1;


  //
  // #unfound SoInterpolateFloat()
  //
};

class  SoInterpolateRotation : public SoInterpolate {
  SO_INTERPOLATE_HEADER(SoInterpolateRotation);
 public:                                
  SoMFRotation        input0;

  SoMFRotation        input1;


  //
  // #unfound SoInterpolateRotation()
  //
};

class  SoInterpolateVec2f : public SoInterpolate {
  SO_INTERPOLATE_HEADER(SoInterpolateVec2f);
 public:                                
  SoMFVec2f           input0;

  SoMFVec2f           input1;


  //
  // #unfound SoInterpolateVec2f()
  //
};

class  SoInterpolateVec3f : public SoInterpolate {
  SO_INTERPOLATE_HEADER(SoInterpolateVec3f);
 public:                                
  SoMFVec3f           input0;

  SoMFVec3f           input1;


  //
  // #unfound SoInterpolateVec3f()
  //
};

class  SoInterpolateVec4f : public SoInterpolate {
  SO_INTERPOLATE_HEADER(SoInterpolateVec4f);
 public:                                
  SoMFVec4f           input0;

  SoMFVec4f           input1;


  //
  // #unfound SoInterpolateVec4f()
  //
};

#endif /* _SO_INTERPOLATE_ */

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Open Inventor Toolkit reference manual, generated on 15 Mar 2023
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