sliceobject.cpp

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//=============================================================================================================
 
//=============================================================================================================
// INCLUDES
//=============================================================================================================
 
#include "sliceobject.h"
 
//=============================================================================================================
// USED NAMESPACES
//=============================================================================================================
 
using namespace DISP3DLIB;
 
//=============================================================================================================
// DEFINE MEMBER METHODS
//=============================================================================================================
 
SliceObject::SliceObject()
    : m_corner00(Eigen::Vector3d::Zero())
    , m_corner10(Eigen::Vector3d::UnitX())
    , m_corner01(Eigen::Vector3d::UnitY())
    , m_corner11(Eigen::Vector3d::UnitX() + Eigen::Vector3d::UnitY())
{
}
 
//=============================================================================================================
 
void SliceObject::setSlice(const QImage& image,
                           SliceOrientation orientation,
                           int sliceIndex,
                           const Eigen::Matrix4d& voxelToWorld)
{
    m_image        = image;
    m_orientation  = orientation;
    m_sliceIndex   = sliceIndex;
    m_voxelToWorld = voxelToWorld;
 
    // Image dimensions define the number of voxels along each in-plane axis.
    const int w = m_image.width();
    const int h = m_image.height();
 
    // Build the four corner positions in voxel coordinates, then transform to world.
    // u runs along image columns, v along image rows.
    Eigen::Vector4d c00, c10, c01, c11;
 
    switch (m_orientation) {
    case SliceOrientation::Axial:
        //  u → X,  v → Y,  slice along Z
        c00 << 0, 0, sliceIndex, 1;
        c10 << w, 0, sliceIndex, 1;
        c01 << 0, h, sliceIndex, 1;
        c11 << w, h, sliceIndex, 1;
        break;
    case SliceOrientation::Sagittal:
        //  u → Y,  v → Z,  slice along X
        c00 << sliceIndex, 0, 0, 1;
        c10 << sliceIndex, w, 0, 1;
        c01 << sliceIndex, 0, h, 1;
        c11 << sliceIndex, w, h, 1;
        break;
    case SliceOrientation::Coronal:
        //  u → X,  v → Z,  slice along Y
        c00 << 0, sliceIndex, 0, 1;
        c10 << w, sliceIndex, 0, 1;
        c01 << 0, sliceIndex, h, 1;
        c11 << w, sliceIndex, h, 1;
        break;
    }
 
    // Transform voxel → world (RAS)
    Eigen::Vector4d w00 = m_voxelToWorld * c00;
    Eigen::Vector4d w10 = m_voxelToWorld * c10;
    Eigen::Vector4d w01 = m_voxelToWorld * c01;
    Eigen::Vector4d w11 = m_voxelToWorld * c11;
 
    m_corner00 = w00.head<3>();
    m_corner10 = w10.head<3>();
    m_corner01 = w01.head<3>();
    m_corner11 = w11.head<3>();
}
 
//=============================================================================================================
 
SliceOrientation SliceObject::orientation() const
{
    return m_orientation;
}
 
//=============================================================================================================
 
int SliceObject::sliceIndex() const
{
    return m_sliceIndex;
}
 
//=============================================================================================================
 
const QImage& SliceObject::image() const
{
    return m_image;
}
 
//=============================================================================================================
 
QMatrix4x4 SliceObject::sliceToWorld() const
{
    // Build a 4×4 matrix that maps the unit quad [0,1]² to the world-space quad.
    // Column 0: edge along u (corner10 – corner00)
    // Column 1: edge along v (corner01 – corner00)
    // Column 3: translation  (corner00)
    Eigen::Vector3d u = m_corner10 - m_corner00;
    Eigen::Vector3d v = m_corner01 - m_corner00;
    Eigen::Vector3d n = u.cross(v).normalized();
 
    QMatrix4x4 mat;
    mat.setToIdentity();
    mat(0, 0) = static_cast<float>(u.x());
    mat(1, 0) = static_cast<float>(u.y());
    mat(2, 0) = static_cast<float>(u.z());
 
    mat(0, 1) = static_cast<float>(v.x());
    mat(1, 1) = static_cast<float>(v.y());
    mat(2, 1) = static_cast<float>(v.z());
 
    mat(0, 2) = static_cast<float>(n.x());
    mat(1, 2) = static_cast<float>(n.y());
    mat(2, 2) = static_cast<float>(n.z());
 
    mat(0, 3) = static_cast<float>(m_corner00.x());
    mat(1, 3) = static_cast<float>(m_corner00.y());
    mat(2, 3) = static_cast<float>(m_corner00.z());
 
    return mat;
}
 
//=============================================================================================================
 
void SliceObject::setWindowLevel(float center, float width)
{
    m_windowCenter = center;
    m_windowWidth  = width;
}
 
//=============================================================================================================
 
float SliceObject::windowCenter() const
{
    return m_windowCenter;
}
 
//=============================================================================================================
 
float SliceObject::windowWidth() const
{
    return m_windowWidth;
}
 
//=============================================================================================================
 
void SliceObject::setOpacity(float opacity)
{
    m_opacity = opacity;
}
 
//=============================================================================================================
 
float SliceObject::opacity() const
{
    return m_opacity;
}
 
//=============================================================================================================
 
void SliceObject::generateQuadVertices(QVector<float>& vertices) const
{
    // 4 vertices: pos(3) + uv(2) = 5 floats each  → 20 floats total
    vertices.resize(20);
    float* p = vertices.data();
 
    // Vertex 0: corner00, uv(0,0)
    *p++ = static_cast<float>(m_corner00.x());
    *p++ = static_cast<float>(m_corner00.y());
    *p++ = static_cast<float>(m_corner00.z());
    *p++ = 0.0f;  *p++ = 0.0f;
 
    // Vertex 1: corner10, uv(1,0)
    *p++ = static_cast<float>(m_corner10.x());
    *p++ = static_cast<float>(m_corner10.y());
    *p++ = static_cast<float>(m_corner10.z());
    *p++ = 1.0f;  *p++ = 0.0f;
 
    // Vertex 2: corner01, uv(0,1)
    *p++ = static_cast<float>(m_corner01.x());
    *p++ = static_cast<float>(m_corner01.y());
    *p++ = static_cast<float>(m_corner01.z());
    *p++ = 0.0f;  *p++ = 1.0f;
 
    // Vertex 3: corner11, uv(1,1)
    *p++ = static_cast<float>(m_corner11.x());
    *p++ = static_cast<float>(m_corner11.y());
    *p++ = static_cast<float>(m_corner11.z());
    *p++ = 1.0f;  *p++ = 1.0f;
}
 
//=============================================================================================================
 
void SliceObject::generateQuadIndices(QVector<unsigned int>& indices)
{
    // Two triangles: (0,1,2) and (2,1,3)
    indices = { 0, 1, 2,  2, 1, 3 };
}