glbackground.cpp

来自「ncbi源码」· C++ 代码 · 共 241 行

/*
 * ===========================================================================
 * PRODUCTION $Log: glbackground.cpp,v $
 * PRODUCTION Revision 1000.2  2004/06/01 20:50:23  gouriano
 * PRODUCTION PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.3
 * PRODUCTION
 * ===========================================================================
 */

/*  $Id: glbackground.cpp,v 1000.2 2004/06/01 20:50:23 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:
 *
 */

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

BEGIN_NCBI_SCOPE


CGlBackground::CGlBackground()
    : m_Type(eSolid),
      m_LightColor(1.0f, 1.0f, 1.0f, 1.0f),
      m_DarkColor(1.0f, 1.0f, 1.0f, 1.0f)
{
}


void CGlBackground::SetType(EType type)
{
    m_Type = type;
}


void CGlBackground::SetTexture(CTexImage& image)
{
    m_Texture.Reset(&image);
}


void CGlBackground::SetColor(const CGlColor& c)
{
    SetLightColor(c);
}


void CGlBackground::SetLightColor(const CGlColor& c)
{
    m_LightColor = c;
}


void CGlBackground::SetDarkColor(const CGlColor& c)
{
    m_DarkColor = c;
}


void CGlBackground::SetDarkColor(void)
{
    // we set the dark color as a fraction of the light color
    m_DarkColor.SetRed(m_LightColor.GetRed() * 0.5f);
    m_DarkColor.SetGreen(m_LightColor.GetGreen() * 0.5f);
    m_DarkColor.SetBlue(m_LightColor.GetBlue() * 0.5f);

    // this doesn't apply to the alpha!
    m_DarkColor.SetAlpha(m_LightColor.GetAlpha());
}


void CGlBackground::Draw(const CGlRect<int>& vp)
{
    glPushAttrib(GL_VIEWPORT_BIT);
    glViewport(vp.Left(), vp.Bottom(), vp.Width(), vp.Height());
    Draw();
    glPopAttrib();
}


void CGlBackground::Draw(void)
{
    //
    // matrix set-up
    // we use an orthographic view, and save all matrices
    //
    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    glOrtho(-1, 1, -1, 1, -1, 1);

    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity();

    // we also save the enables, as we plan to enable/disable a lot of things
    glPushAttrib(GL_ENABLE_BIT);

    // disable the expensive tests
    glDisable(GL_CULL_FACE);
    glDisable(GL_DEPTH_TEST);
    glDisable(GL_BLEND);


    switch (m_Type) {
    case eSolid:
        // solid background
        // we use only m_LightColor here
        glDisable(GL_TEXTURE_2D);
        glColor3fv(m_LightColor.GetGlColor());
        glBegin(GL_QUADS);
            glVertex2i( 1, -1);
            glVertex2i( 1,  1);
            glVertex2i(-1,  1);
            glVertex2i(-1, -1);
        glEnd();
        break;

    case eGradientDown:
        // gradient from top->bottom, light->dark
        // there is no requirement that light be brighter than dark
        glDisable(GL_TEXTURE_2D);
        glBegin(GL_QUADS);
            glColor3fv(m_LightColor.GetGlColor());
            glVertex2i(-1,  1);
            glVertex2i( 1,  1);

            glColor3fv(m_DarkColor.GetGlColor());
            glVertex2i( 1, -1);
            glVertex2i(-1, -1);
        glEnd();
        break;

    case eGradientRight:
        // gradient from top->bottom, light->dark
        // there is no requirement that light be brighter than dark
        glDisable(GL_TEXTURE_2D);
        glBegin(GL_QUADS);
            glColor3fv(m_LightColor.GetGlColor());
            glVertex2i(-1,  1);
            glVertex2i(-1, -1);

            glColor3fv(m_DarkColor.GetGlColor());
            glVertex2i( 1, -1);
            glVertex2i( 1,  1);
        glEnd();
        break;

    case eTexture:
        // use a texture, if possible.  Otherwise, this is the same as a solid
        // background
        // make our texture current if it is available
        if (m_Texture) {
            glEnable(GL_TEXTURE_2D);
            m_Texture->MakeCurrent();
            // this is always rendered with a white background
            glColor3f(1.0f, 1.0f, 1.0f);
        } else {
            glDisable(GL_TEXTURE_2D);
            glColor3fv(m_LightColor.GetGlColor());
        }

        glBegin(GL_QUADS);
            glTexCoord2f(0.0f, 0.0f);
            glVertex2i(-1,  1);

            glTexCoord2f(1.0f, 0.0f);
            glVertex2i( 1,  1);

            glTexCoord2f(1.0f, 1.0f);
            glVertex2i( 1, -1);

            glTexCoord2f(0.0f, 1.0f);
            glVertex2i(-1, -1);
        glEnd();
        break;
    }

    //
    // restore our states
    // this is done so as to leave the modelview matrix as the last active
    // matrix
    //
    glPopAttrib();

    glMatrixMode (GL_PROJECTION);
    glPopMatrix();

    glMatrixMode (GL_MODELVIEW);
    glPopMatrix();

}


END_NCBI_SCOPE


/*
 * ===========================================================================
 * $Log: glbackground.cpp,v $
 * Revision 1000.2  2004/06/01 20:50:23  gouriano
 * PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.3
 *
 * Revision 1.3  2004/05/21 22:27:44  gorelenk
 * Added PCH ncbi_pch.hpp
 *
 * Revision 1.2  2004/03/22 18:49:59  dicuccio
 * Added API to restrict drawing to an indicated viewport
 *
 * Revision 1.1  2003/06/09 19:22:13  dicuccio
 * Initial revision
 *
 * ===========================================================================
 */