//
// "$Id: CubeView.cxx 4886 2006-03-30 09:55:32Z fabien $"
//
// CubeView class implementation for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2006 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "fltk-bugs@fltk.org".
//

#include "CubeView.h"
#include <math.h>

#if HAVE_GL
CubeView::CubeView(int x,int y,int w,int h,const char *l)
            : GlWindow(x,y,w,h,l)
#else
CubeView::CubeView(int x,int y,int w,int h,const char *l)
            : Widget(x,y,w,h,l)
#endif /* HAVE_GL */
{
    vAng = 0.0;
    hAng=0.0;
    size=10.0;
    xshift=yshift=0;
    /* The cube definition. These are the vertices of a unit cube
     * centered on the origin.*/
    
    boxv0[0] = -0.5; boxv0[1] = -0.5; boxv0[2] = -0.5;
    boxv1[0] =  0.5; boxv1[1] = -0.5; boxv1[2] = -0.5;
    boxv2[0] =  0.5; boxv2[1] =  0.5; boxv2[2] = -0.5;
    boxv3[0] = -0.5; boxv3[1] =  0.5; boxv3[2] = -0.5;
    boxv4[0] = -0.5; boxv4[1] = -0.5; boxv4[2] =  0.5;
    boxv5[0] =  0.5; boxv5[1] = -0.5; boxv5[2] =  0.5;
    boxv6[0] =  0.5; boxv6[1] =  0.5; boxv6[2] =  0.5;
    boxv7[0] = -0.5; boxv7[1] =  0.5; boxv7[2] =  0.5;

#if !HAVE_GL
    label("OpenGL is required for this demo to operate.");
    align(fltk::ALIGN_WRAP | fltk::ALIGN_INSIDE);
    box(fltk::NO_BOX);
    labelcolor(fltk::WHITE);
#endif /* !HAVE_GL */
}

#if HAVE_GL
void CubeView::drawCube() 
{
    /* Draw a colored cube */
    #define ALPHA 0.5
    
    glShadeModel(GL_FLAT);

    glBegin(GL_QUADS);
      glColor4f(0.0, 0.0, 1.0, ALPHA);
      glVertex3fv(boxv0);
      glVertex3fv(boxv1);
      glVertex3fv(boxv2);
      glVertex3fv(boxv3);

      glColor4f(1.0, 1.0, 0.0, ALPHA);
      glVertex3fv(boxv0);
      glVertex3fv(boxv4);
      glVertex3fv(boxv5);
      glVertex3fv(boxv1);

      glColor4f(0.0, 1.0, 1.0, ALPHA);
      glVertex3fv(boxv2);
      glVertex3fv(boxv6);
      glVertex3fv(boxv7);
      glVertex3fv(boxv3);

      glColor4f(1.0, 0.0, 0.0, ALPHA);
      glVertex3fv(boxv4);
      glVertex3fv(boxv5);
      glVertex3fv(boxv6);
      glVertex3fv(boxv7);

      glColor4f(1.0, 0.0, 1.0, ALPHA);
      glVertex3fv(boxv0);
      glVertex3fv(boxv3);
      glVertex3fv(boxv7);
      glVertex3fv(boxv4);

      glColor4f(0.0, 1.0, 0.0, ALPHA);
      glVertex3fv(boxv1);
      glVertex3fv(boxv5);
      glVertex3fv(boxv6);
      glVertex3fv(boxv2);
    glEnd();

    glColor3f(1.0, 1.0, 1.0);
    glBegin(GL_LINES);
      glVertex3fv(boxv0);
      glVertex3fv(boxv1);

      glVertex3fv(boxv1);
      glVertex3fv(boxv2);

      glVertex3fv(boxv2);
      glVertex3fv(boxv3);

      glVertex3fv(boxv3);
      glVertex3fv(boxv0);

      glVertex3fv(boxv4);
      glVertex3fv(boxv5);

      glVertex3fv(boxv5);
      glVertex3fv(boxv6);

      glVertex3fv(boxv6);
      glVertex3fv(boxv7);

      glVertex3fv(boxv7);
      glVertex3fv(boxv4);

      glVertex3fv(boxv0);
      glVertex3fv(boxv4);

      glVertex3fv(boxv1);
      glVertex3fv(boxv5);

      glVertex3fv(boxv2);
      glVertex3fv(boxv6);

      glVertex3fv(boxv3);
      glVertex3fv(boxv7);
    glEnd();
}

void CubeView::draw() 
{
    if (!valid()) {
        glLoadIdentity();
        glViewport(0,0,w(),h());
        glOrtho(-10,10,-10,10,-20000,10000);
        glEnable(GL_BLEND);
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    }

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

    glTranslatef(xshift, yshift, 0);
    glRotatef(hAng,0,1,0); glRotatef(vAng,1,0,0);
    glScalef(float(size),float(size),float(size));

    drawCube();
    
    glPopMatrix();
}
#endif /* HAVE_GL */

//
// End of "$Id: CubeView.cxx 4886 2006-03-30 09:55:32Z fabien $".
//
