glcanvas3d.cpp

来自「ncbi源码」· C++ 代码 · 共 170 行

/*
 * ===========================================================================
 * PRODUCTION $Log: glcanvas3d.cpp,v $
 * PRODUCTION Revision 1000.2  2004/06/01 20:50:35  gouriano
 * PRODUCTION PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.7
 * PRODUCTION
 * ===========================================================================
 */

/*  $Id: glcanvas3d.cpp,v 1000.2 2004/06/01 20:50:35 gouriano Exp $
 * ===========================================================================
 *
 *                            PUBLIC DOMAIN NOTICE
 *               National Center for Biotechnology Information
 *
 *  This software/database is a "United States Government Work" under the
 *  terms of the United States Copyright Act.  It was written as part of
 *  the author's official duties as a United States Government employee and
 *  thus cannot be copyrighted.  This software/database is freely available
 *  to the public for use. The National Library of Medicine and the U.S.
 *  Government have not placed any restriction on its use or reproduction.
 *
 *  Although all reasonable efforts have been taken to ensure the accuracy
 *  and reliability of the software and data, the NLM and the U.S.
 *  Government do not and cannot warrant the performance or results that
 *  may be obtained by using this software or data. The NLM and the U.S.
 *  Government disclaim all warranties, express or implied, including
 *  warranties of performance, merchantability or fitness for any particular
 *  purpose.
 *
 *  Please cite the author in any work or product based on this material.
 *
 * ===========================================================================
 *
 * Authors:  Mike DiCuccio
 *
 * File Description:
 *    CGlCanvas3d -- provide standardized OpenGL view setup for FLTK
 */


#include <ncbi_pch.hpp>
#include <gui/opengl/glcanvas3d.hpp>


BEGIN_NCBI_SCOPE



CGlCanvas3d::CGlCanvas3d(int x, int y, int width, int height, const char* label)
    : CGlCanvas(x, y, width, height, label)
{
    m_Camera.SetLayout(CGlCamera::ePerspective);
    m_Camera.SetNearPlane  (0.1f);
    m_Camera.SetFarPlane   (1000.0f);
    m_Camera.SetFieldOfView(45.0f);
    m_Camera.SetAspectRatio(float(w()) / float(h()));
}


CGlCanvas3d::~CGlCanvas3d(void)
{
}


void CGlCanvas3d::resize(int x, int y, int w, int h)
{
    CGlCanvas::resize(x, y, w, h);
    m_Camera.SetAspectRatio(float(w) / float(h));
}


//
// CGlCanvas3d::setupView(void)
// this function is responsible for establishing the standard view
// setup parameters, including viewport and viewing matrices
//
void CGlCanvas3d::x_SetupView(void)
{
    // set up a standard viewport
    glViewport(0, 0, w(), h());

    // set our viewing matrices.  we don't save the old matrices, so there is
    // no need to call ReleaseCurrent().
    // we also make sure that our aspect ratio is up-to-date
    m_Camera.MakeCurrent();

    // always leave in modelview matrix
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}


void CGlCanvas3d::Project(float& x, float& y,float& z) const
{
    GLint viewport[4];
    GLdouble proj_matrix[16];
    GLdouble model_matrix[16];
    glGetDoublev(GL_PROJECTION_MATRIX, proj_matrix);
    glGetDoublev(GL_MODELVIEW_MATRIX,  model_matrix);
    glGetIntegerv(GL_VIEWPORT, viewport);

    GLdouble px = 0.0;
    GLdouble py = 0.0;
    GLdouble pz = 0.0;
    gluProject(x, y, z, model_matrix, proj_matrix, viewport,
               &px, &py, &pz);
    x = (float)px;
    y = (float)py;
    z = (float)pz;
}


void CGlCanvas3d::Unproject(float& x, float& y,float& z) const
{
    GLint viewport[4];
    GLdouble proj_matrix[16];
    GLdouble model_matrix[16];
    glGetDoublev(GL_PROJECTION_MATRIX, proj_matrix);
    glGetDoublev(GL_MODELVIEW_MATRIX,  model_matrix);
    glGetIntegerv(GL_VIEWPORT, viewport);

    GLdouble px = 0.0;
    GLdouble py = 0.0;
    GLdouble pz = 0.0;
    gluUnProject(x, y, z, model_matrix, proj_matrix, viewport,
               &px, &py, &pz);
    x = (float)px;
    y = (float)py;
    z = (float)pz;
}



END_NCBI_SCOPE


/*
 * ===========================================================================
 * $Log: glcanvas3d.cpp,v $
 * Revision 1000.2  2004/06/01 20:50:35  gouriano
 * PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.7
 *
 * Revision 1.7  2004/05/21 22:27:45  gorelenk
 * Added PCH ncbi_pch.hpp
 *
 * Revision 1.6  2004/03/12 15:24:21  rsmith
 * change native types to GLxxx types for better portability.
 *
 * Revision 1.5  2004/03/11 17:37:42  dicuccio
 * Added resize(), Project(), Unproject()
 *
 * Revision 1.4  2003/09/29 15:44:40  dicuccio
 * Deprecated gui/scope.hpp.  Merged gui/core/types.hpp into gui/types.hpp
 *
 * Revision 1.3  2003/07/21 19:31:34  dicuccio
 * Added NULL callback for CGlCanvas - works around interenting problem with
 * Fl_Gl_Window's default callback.  Removed unused ctor.
 *
 * Revision 1.2  2003/06/03 17:42:06  dicuccio
 * Added texture support.  Added classes to handle OpenGL camera setup and
 * viewport specification.
 *
 * Revision 1.1  2003/05/06 16:00:33  dicuccio
 * Initial revision
 *
 * ===========================================================================
 */