GLClipPlane.cpp

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//------------------------------------------------------------------------
//
//   Mark Hartner
//     9-18-03
//                   ________    ____   ___ 
//                  |        \  /    | /  /
//                  +---+     \/     |/  /
//                  +--+|  |\    /|     < 
//                  |  ||  | \  / |  |\  \ 
//                  |      |  \/  |  | \  \ 
//                   \_____|      |__|  \__\
//                       Copyright  2003 
//                      Joe Michael Kniss
//                   <<< jmk@cs.utah.edu >>>
//               "All Your Base are Belong to Us"
//-------------------------------------------------------------------------

// GLClipPlane.cpp

#include "GLClipPlane.h"
#include <iostream>
#include <GL/glew.h>

using namespace std; //<iostream>
using namespace gutz;

GLClipPlane::GLClipPlane()
{
}

GLClipPlane::GLClipPlane(gutz::planef p)
{
  GLdouble eqn[4] = {p.n.x, p.n.y, p.n.z, -p.n.dot(p.p)};
  cout<<"Orig clip eqn is "<<p.n.x<<" "<<p.n.y<<" "<<p.n.z<<" "<<-p.n.dot(p.p)<<endl;
  glClipPlane(GL_CLIP_PLANE5,eqn);
}

GLClipPlane::GLClipPlane(FrameWidget *fw)
{
  gutz::planef p = fw->getPlane();
  GLdouble eqn[4] = {p.n.x, p.n.y, p.n.z, -p.n.dot(p.p)};
  cout<<"Orig clip eqn is "<<p.n.x<<" "<<p.n.y<<" "<<p.n.z<<" "<<-p.n.dot(p.p)<<endl;
  glClipPlane(GL_CLIP_PLANE5,eqn);
  //gutz::connect(fw->planeChanged, &someClipObj, &GLClipPlane::updateClipPlane);
  gutz::connect(fw->planeChanged, this, &GLClipPlane::updateClipPlane);
}

GLClipPlane::~GLClipPlane()
{
}

//connect this function to FrameWidget::planeChanged()
//in your main function
// gutz::connect(someFrame.planeChanged, &someClipObj, &GLClipPlane::updateClipPlane)
void GLClipPlane::updateClipPlane(gutz::planef p)
{
  cout<<"Hey, we need to update our clipping plane"<<endl;

  // convert eqn to plane equation
  cout<<"New clip eqn is "<<p.n.x<<" "<<p.n.y<<" "<<p.n.z<<" "<<-p.n.dot(p.p)<<endl;
  //GLdouble eqn[4] = {0.0, 0.0, 1.0, 0.0};
  

  // -P dot N = D
  // (A B C) = N
  // N = plane.n p=plane.p

  //vec3f abc = p.n;
  //float d = -abc.dot(p.p);

  GLdouble eqn[4] = {p.n.x, p.n.y, p.n.z, -p.n.dot(p.p)};
  
  glClipPlane(GL_CLIP_PLANE5,eqn);
  
}

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