/**
* Progam made by Olivier Bernard, associate professor
* at Institut National des Sciences Appliquees (INSA) Lyon,
* CREATIS-LRMN Laboratory,
* 69621 Villeurbanne, France,
* 20th of May 2014
*/

#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include "vtkMyInteractorStyleTrackballCameraOpenHeartXZ.h"


using namespace std;


void vtkMyInteractorStyleTrackballCameraOpenHeartXZ::OnMouseWheelForward()
{

    /// Get picker position
    double pos[3];
    this->GetPickerPosition(pos);

    /// Go back to the initial coordinate system before reslicing
    double posXYZ[3];
    for (int i=0; i<3; i++)
        posXYZ[i] = pos[i];
    this->window->ComputePointBeforeRotation(posXYZ);

    /// Update Slice image
    if ( this->IsInside(posXYZ) )
    {
        /// Compute corresponding step
        if ( (posXYZ[0] >= this->Limits[0] ) &&
             (posXYZ[0] <= this->Limits[1] ) &&
             (posXYZ[2] >= this->Limits[2] ) &&
             (posXYZ[2] <= this->Limits[3] ) )
            this->Step = 1;
        else
            this->Step = 5;

        /// Compute new slice position
        double limit = this->Bounds[3];
        posXYZ[1] += this->Step * this->window->GetCurrentImageData()->GetSpacing()[1];
        if ( posXYZ[1] <= limit )
            this->window->GetRendererProperties()->position[1] += this->Step * this->window->GetCurrentImageData()->GetSpacing()[1];

        /// Update Slice text
        if ( this->window->GetFlagDisplayText() )
        {
            int slice = (int)( (this->window->GetRendererProperties()->position[1] -
                                this->window->GetCurrentImageData()->GetOrigin()[1]) /
                                this->window->GetCurrentImageData()->GetSpacing()[1] + 0.5f );
            QString strSlice;
            strSlice.sprintf("Slice: %d",slice);
            this->window->GetRendererProperties()->TextMapperSlice->SetInput(strSlice.toStdString().c_str());
        }

        /// Update renderers
        this->window->GetRendererProperties()->yIPW->SetSlicePosition(this->window->GetRendererProperties()->position[1]);
        this->window->GetRendererProperties()->xzIPW->SetSlicePosition(this->window->GetRendererProperties()->position[1]);
        this->window->GetRenderWindow()->Render();
        this->window->GetXZRenderer()->ResetCameraClippingRange();
        this->window->GetRenderWindowXZ()->Render();
    }

}


void vtkMyInteractorStyleTrackballCameraOpenHeartXZ::OnMouseWheelBackward()
{

    /// Get picker position
    double pos[3];
    this->GetPickerPosition(pos);

    /// Go back to the initial coordinate system before reslicing
    double posXYZ[3];
    for (int i=0; i<3; i++)
        posXYZ[i] = pos[i];
    this->window->ComputePointBeforeRotation(posXYZ);

    /// Update Slice image
    if ( this->IsInside(posXYZ) )
    {
        /// Compute corresponding step
        if ( (posXYZ[0] >= this->Limits[0] ) &&
             (posXYZ[0] <= this->Limits[1] ) &&
             (posXYZ[2] >= this->Limits[2] ) &&
             (posXYZ[2] <= this->Limits[3] ) )
            this->Step = 1;
        else
            this->Step = 5;

        /// Compute new slice position
        posXYZ[1] -= this->Step * this->window->GetCurrentImageData()->GetSpacing()[1];
        if ( posXYZ[1] >= 0 )
            this->window->GetRendererProperties()->position[1] -= this->Step * this->window->GetCurrentImageData()->GetSpacing()[1];

        /// Update Slice text
        if ( this->window->GetFlagDisplayText() )
        {
            int slice = (int)( (this->window->GetRendererProperties()->position[1] -
                                this->window->GetCurrentImageData()->GetOrigin()[1]) /
                                this->window->GetCurrentImageData()->GetSpacing()[1] + 0.5f );
            QString strSlice;
            strSlice.sprintf("Slice: %d",slice);
            this->window->GetRendererProperties()->TextMapperSlice->SetInput(strSlice.toStdString().c_str());
        }

        /// Update renderers
        this->window->GetRendererProperties()->yIPW->SetSlicePosition(this->window->GetRendererProperties()->position[1]);
        this->window->GetRendererProperties()->xzIPW->SetSlicePosition(this->window->GetRendererProperties()->position[1]);
        this->window->GetRenderWindow()->Render();
        this->window->GetXZRenderer()->ResetCameraClippingRange();
        this->window->GetRenderWindowXZ()->Render();
    }

}


void vtkMyInteractorStyleTrackballCameraOpenHeartXZ::OnEnter()
{

    if ( !this->FlagFirstTime )
    {

        /// Set flag to 1 to never enter again in this part of the code
        this->FlagFirstTime = 1;
        double extend[6];
        this->window->GetCurrentImageData()->GetWholeBoundingBox(extend);

        /// Save the boundary of the volume in world coordinates
        this->Bounds[0] = this->window->GetCurrentImageData()->GetExtent()[0] * this->window->GetCurrentImageData()->GetSpacing()[0] +
                this->window->GetCurrentImageData()->GetOrigin()[0];
        this->Bounds[1] = this->window->GetCurrentImageData()->GetExtent()[1] * this->window->GetCurrentImageData()->GetSpacing()[0] +
                this->window->GetCurrentImageData()->GetOrigin()[0];
        this->Bounds[2] = this->window->GetCurrentImageData()->GetExtent()[2] * this->window->GetCurrentImageData()->GetSpacing()[1] +
                this->window->GetCurrentImageData()->GetOrigin()[1];
        this->Bounds[3] = this->window->GetCurrentImageData()->GetExtent()[3] * this->window->GetCurrentImageData()->GetSpacing()[1] +
                this->window->GetCurrentImageData()->GetOrigin()[1];
        this->Bounds[4] = this->window->GetCurrentImageData()->GetExtent()[4] * this->window->GetCurrentImageData()->GetSpacing()[2] +
                this->window->GetCurrentImageData()->GetOrigin()[2];
        this->Bounds[5] = this->window->GetCurrentImageData()->GetExtent()[5] * this->window->GetCurrentImageData()->GetSpacing()[2] +
                this->window->GetCurrentImageData()->GetOrigin()[2];

        /// Save the limit of the box to increase the scolling effect
        this->Limits[0] = (this->Bounds[1] - this->Bounds[0]) * this->PadBound;
        this->Limits[1] = this->Bounds[1] - (this->Bounds[1] - this->Bounds[0]) * this->PadBound;
        this->Limits[2] = (this->Bounds[5] - this->Bounds[4]) * this->PadBound;
        this->Limits[3] = this->Bounds[5] - (this->Bounds[5] - this->Bounds[4]) * this->PadBound;

    }

    vtkInteractorStyleTrackballCamera::OnEnter();

}


void vtkMyInteractorStyleTrackballCameraOpenHeartXZ::OnLeave()
{
    this->Step = 1;
    vtkInteractorStyleTrackballCamera::OnLeave();
}


void vtkMyInteractorStyleTrackballCameraOpenHeartXZ::GetPickerPosition(double *pos)
{
    int X = this->Interactor->GetEventPosition()[0];
    int Y = this->Interactor->GetEventPosition()[1];
    this->window->GetPickerXZ()->Pick(X,Y,0.0,this->window->GetXZRenderer());
    this->window->GetPickerXZ()->GetPickPosition(pos);
}


bool vtkMyInteractorStyleTrackballCameraOpenHeartXZ::IsInside(double *pos)
{
    if ( (pos[0]>=this->Bounds[0]) && (pos[0]<=this->Bounds[1]) &&
         (pos[1]>=this->Bounds[2]) && (pos[1]<=this->Bounds[3]) &&
         (pos[2]>=this->Bounds[4]) && (pos[2]<=this->Bounds[5]) )
        return true;
    else
        return false;
}