track_ball.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2015-2016 Mario Luzeiro <[email protected]>
 * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

 
#include "track_ball.h"
#include "trackball.h"
#include "../3d_math.h"
#include <wx/log.h>
 
#include <glm/gtc/quaternion.hpp>
 
// stdlib
#include <algorithm>
 
 
TRACK_BALL::TRACK_BALL( float aInitialDistance ) : CAMERA( aInitialDistance )
{
    wxLogTrace( m_logTrace, wxT( "TRACK_BALL::TRACK_BALL" ) );
    initQuat();
}
 
 
TRACK_BALL::TRACK_BALL( SFVEC3F aInitPos, SFVEC3F aLookat, PROJECTION_TYPE aProjectionType ) :
        CAMERA( aInitPos, aLookat, aProjectionType )
{
    wxLogTrace( m_logTrace, wxT( "TRACK_BALL::TRACK_BALL" ) );
    initQuat();
}
 
 
void TRACK_BALL::initQuat()
{
    memset( m_quat_t0, 0, sizeof( m_quat_t0 ) );
    memset( m_quat_t1, 0, sizeof( m_quat_t1 ) );
 
    trackball( m_quat_t0, 0.0, 0.0, 0.0, 0.0 );
    trackball( m_quat_t1, 0.0, 0.0, 0.0, 0.0 );
}
 
 
void TRACK_BALL::Drag( const wxPoint& aNewMousePosition )
{
    m_parametersChanged = true;
 
    double spin_quat[4];
 
    // "Pass the x and y coordinates of the last and current positions of
    //  the mouse, scaled so they are from (-1.0 ... 1.0)."
    const float zoom = 1.0f;
 
    trackball( spin_quat, zoom * ( 2.0 * m_lastPosition.x - m_windowSize.x ) / m_windowSize.x,
               zoom * ( m_windowSize.y - 2.0 * m_lastPosition.y ) / m_windowSize.y,
               zoom * ( 2.0 * aNewMousePosition.x - m_windowSize.x ) / m_windowSize.x,
               zoom * ( m_windowSize.y - 2.0 * aNewMousePosition.y ) / m_windowSize.y );
 
    float spin_matrix[4][4];
    build_rotmatrix( spin_matrix, spin_quat );
    m_rotationMatrix = glm::make_mat4( &spin_matrix[0][0] ) * m_rotationMatrix;
 
    updateViewMatrix();
 
    updateFrustum();
}
 
void TRACK_BALL::Pan( const wxPoint& aNewMousePosition )
{
    m_parametersChanged = true;
 
    if( m_projectionType == PROJECTION_TYPE::ORTHO )
    {
        m_camera_pos.x -= m_frustum.nw *
                ( m_lastPosition.x - aNewMousePosition.x ) / m_windowSize.x;
        m_camera_pos.y -= m_frustum.nh *
                ( aNewMousePosition.y - m_lastPosition.y ) / m_windowSize.y;
    }
    else // PROJECTION_TYPE::PERSPECTIVE
    {
        // Unproject the coordinates using the precomputed frustum tangent (zoom level dependent)
        const float panFactor = -m_camera_pos.z * m_frustum.tang * 2;
        m_camera_pos.x -= panFactor * m_frustum.ratio *
                ( m_lastPosition.x - aNewMousePosition.x ) / m_windowSize.x;
        m_camera_pos.y -= panFactor * ( aNewMousePosition.y - m_lastPosition.y ) / m_windowSize.y;
    }
 
    updateViewMatrix();
    updateFrustum();
}
 
void TRACK_BALL::Pan( const SFVEC3F& aDeltaOffsetInc )
{
    m_parametersChanged = true;
 
    m_camera_pos += aDeltaOffsetInc;
 
    updateViewMatrix();
    updateFrustum();
}
 
void TRACK_BALL::Pan_T1( const SFVEC3F& aDeltaOffsetInc )
{
    m_camera_pos_t1 = m_camera_pos + aDeltaOffsetInc;
}
 
void TRACK_BALL::Reset_T1()
{
    CAMERA::Reset_T1();
 
    memset( m_quat_t1, 0, sizeof( m_quat_t1 ) );
    trackball( m_quat_t1, 0.0, 0.0, 0.0, 0.0 );
}
 
void TRACK_BALL::SetT0_and_T1_current_T()
{
    CAMERA::SetT0_and_T1_current_T();
 
    double quat[4];
 
    // Charge the quaternions with the current rotation matrix to allow dual input.
    std::copy_n( glm::value_ptr( glm::conjugate( glm::quat_cast( m_rotationMatrix ) ) ),
                 sizeof( quat ) / sizeof( quat[0] ), quat );
 
    memcpy( m_quat_t0, quat, sizeof( quat ) );
    memcpy( m_quat_t1, quat, sizeof( quat ) );
}
 
void TRACK_BALL::Interpolate( float t )
{
    wxASSERT( t >= 0.0f );
 
    // Limit t o 1.0
    t = ( t > 1.0f ) ? 1.0f : t;
 
    switch( m_interpolation_mode )
    {
    case CAMERA_INTERPOLATION::BEZIER:
        t = BezierBlend( t );
        break;
 
    case CAMERA_INTERPOLATION::EASING_IN_OUT:
        t = QuadricEasingInOut( t );
        break;
 
    case CAMERA_INTERPOLATION::LINEAR:
    default:
        break;
    }
 
    glm::quat q0( (float) m_quat_t0[3], (float) m_quat_t0[0], (float) m_quat_t0[1], (float) m_quat_t0[2] );
    glm::quat q1( (float) m_quat_t1[3], (float) m_quat_t1[0], (float) m_quat_t1[1], (float) m_quat_t1[2] );
 
    if( glm::dot( q0, q1 ) < 0.0f )
        q1 = -q1;
 
    const glm::quat q = glm::normalize( glm::slerp( q0, q1, t ) );
 
    m_rotationMatrix = glm::mat4_cast( glm::conjugate( q ) );
 
    CAMERA::Interpolate( t );
}