manipulators/manipcamera/ormanipcamera_manip.cxx

/***************************************************************************************
 Autodesk(R) Open Reality(R) Samples
 
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***************************************************************************************/

//--- Class declarations
#include "ormanipcamera_manip.h"
#include <math.h>

//--- Registration define
#define ORMANIPCAMERA__CLASS    ORMANIPCAMERA__CLASSNAME
#define ORMANIPCAMERA__LABEL    "OR - Camera"
#define ORMANIPCAMERA__DESC     "OR Camera Manipulator Description"

//--- FiLMBOX implementation and registration
FBManipulatorImplementation (   ORMANIPCAMERA__CLASS        );
FBRegisterManipulator       (   ORMANIPCAMERA__CLASS,
                                ORMANIPCAMERA__LABEL,
                                ORMANIPCAMERA__DESC,
                                FB_DEFAULT_SDK_ICON         );  // Icon filename (default=Open Reality icon)
/************************************************
 *  FiLMBOX Constructor.
 ************************************************/
bool ORManipulatorCamera::FBCreate()
{
    if( FBManipulator::FBCreate() )
    {
        FBVector3d  lPos;
        FBCamera*   lCamera     = NULL;
        FBModel*    lInterest   = NULL;

        // Assign default values.
        mZoomingOut             = false;
        mTurningLeft            = false;
        mAnimatingAOV           = false;
        mRotating               = false;
        mStepAOV                = 0.1;
        mStepRotate             = 0.1;
        mModelRotate            = NULL;

        // Create camera & interest.
        lCamera             = new FBCamera      ( "MyCamera"    );
        lInterest           = new FBModelNull   ( "MyInterest"  );
        lCamera->Show       = true;
        lInterest->Show     = true;
        lCamera->LookAt     = lInterest;

        // Set the new camera position
        lPos[0] = 200.0;
        lPos[1] = 150.0;
        lPos[2] = 150.0;
        lCamera->SetVector( lPos, kModelTranslation, true );

        return true;
    }
    return false;
}


/************************************************
 *  FiLMBOX Destructor.
 ************************************************/
void ORManipulatorCamera::FBDestroy()
{
    FBManipulator::FBDestroy();
}


/************************************************
 *  Draw function for the manipulator.
 *  In this function we are able to interact with the 3D
 *  viewer in FiLMBOX.
 ************************************************/
void ORManipulatorCamera::ViewExpose()
{
    // Get the current camera.
    FBCamera*   lCamera = (FBCamera*)   CurrentCamera;

    FBTVector   lRVS, lRVE;
    FBTVector   lTV, lUV;
    FBVector3d  lVector;
    char        lText[50];
    char        lText2[50];

    // Display the current angle of view in the viewer.
    sprintf(lText,"Angle of viewX: %lf",(double) lCamera->FieldOfViewX);
    sprintf(lText2,"Angle of viewY: %lf",(double) lCamera->FieldOfViewY);
    ViewerText = lText;

    // If we're animating the AOV
    if(mAnimatingAOV)
    {
        // Calculate the new angle of view.
        lCamera->FieldOfView = lCamera->FieldOfView + (mZoomingOut?1:-1)*mStepAOV;
    }

    // If there is an object to rotate.
    if(mRotating)
    {
        // Get the current model to rotate.
        FBModel* lModel = mModelRotate;

        // If there is no model, use the current camera.
        if( ! lModel )
        {
            lModel = CurrentCamera;
        }

        // Get the local position.
        lModel->GetVector( lVector, kModelTranslation, true );

        // Up vector.
        lUV.mValue[0] = 0.0;
        lUV.mValue[1] = 1.0;
        lUV.mValue[2] = 0.0;

        // Use the X & Z coordinates to make a circle
        lRVS.mValue[0] = lVector.mValue[0];
        lRVS.mValue[1] = 0.0;
        lRVS.mValue[2] = lVector.mValue[2];

        // Calculate radius & tangeant lengths (isoceles triangle).
        double lRLength = FBLength( lRVS );
        double lTLength = lRLength * sin( mStepRotate/57.3 ) / sin( (180-mStepRotate) / (2*57.3) );

        FBMult  ( lTV,  mTurningLeft ? lRVS:lUV, mTurningLeft ? lUV:lRVS );
        FBMult  ( lTV,  lTV,    1/FBLength(lTV)     );
        FBMult  ( lTV,  lTV,    lTLength            );
        FBAdd   ( lRVE, lRVS,   lTV                 );
        FBMult  ( lRVE, lRVE,   1/FBLength( lRVE )  );
        FBMult  ( lRVE, lRVE,   lRLength            );

        // Copy the new values into the vector to affect the model with.
        lVector.mValue[0] = lRVE.mValue[0];
        lVector.mValue[1] = lVector.mValue[1];  // Keep the Y (height)
        lVector.mValue[2] = lRVE.mValue[2];

        // Affect the model's vector.
        lModel->SetVector( lVector, kModelTranslation, true );
    }

    FBManipulator::ViewExpose();
}


/************************************************
 *  View and use the input from the user interacting
 *  with the 3D viewer.
 ************************************************/
bool ORManipulatorCamera::ViewInput(int pMouseX, int pMouseY, FBInputType pAction, int pButtonKey, int pModifier)
{
    return FBManipulator::ViewInput(pMouseX, pMouseY, pAction, pButtonKey, pModifier);
}