#include "BasicDrawer.h"

#include <iostream>

using namespace std;

namespace X3DTK {
namespace MESH {

void BasicDrawer::drawVertices(Mesh *M)
{
  glDisable(GL_LIGHTING);
  glColor3f(1.0f, 0.9f, 0.8f);
  glPointSize(1.0f);
  
  // Getting the vertices.
  const Mesh::MFVertex &vertices = M->getVertices();

  glBegin(GL_POINTS);
  // iterating the points.
  for (Mesh::MFVertex::const_iterator v = vertices.begin(), end = vertices.end() ; v != end; ++v)
    glVertex3fv((*v)->data().getPoint());

  glEnd();
}
  
void BasicDrawer::drawEdges(Mesh *M)
{
  glDisable(GL_LIGHTING);

  // Getting the edges.
  const Mesh::MFEdge &edges = M->getEdges();

  glBegin(GL_LINES);
  // iterating the edges.  
  for (Mesh::MFEdge::const_iterator e = edges.begin(), end = edges.end() ; e != end; ++e)
  {
    // drawing in blue color if the edge is a boundary.
    if ((*e)->isBoundary())
      glColor3f(0.3, 0.3, 0.9);
    else
      glColor3f(0.7, 0.7, 0.7);

    // Getting the extremities of the edge.
    glVertex3fv((*e)->getFromVertex()->data().getPoint());
    glVertex3fv((*e)->getToVertex()->data().getPoint());
  }
  glEnd();  
}
  
void BasicDrawer::drawFaces(Mesh *M)
{
  glEnable(GL_LIGHTING);
  
  // Getting the properties of the Mesh.
  bool hasColor = M->data().hasColor(); 
  
  // Getting the faces.
  const Mesh::MFFace &faces = M->getFaces();

  // iterating the faces. 
  for (Mesh::MFFace::const_iterator f = faces.begin(), end = faces.end() ; f != end; ++f)
  {
    glBegin(GL_POLYGON);
    // getting the edges of the face.
    const SFFace::MFEdge &edges = (*f)->getEdges();
    // iterating the edges to iterate the vertices of the face.
    for (SFFace::MFEdge::const_iterator e = edges.begin(), end = edges.end() ; e != end; ++e)
    {
      // Getting the vertex.
      SFVertex *v = (*e)->getFromVertex();
      // setting the normal of the vertex.
      glNormal3fv(v->data().getNormalOfFace(*f));

      // setting the color of the vertex.
      if (hasColor)
        glColor4fv(v->data().getColorOfFace(*f));
      else
        glColor4f(0.8f, 0.8f, 0.8f, 1.0f);
      
      // Getting the point data.  
      glVertex3fv(v->data().getPoint());
    }
    glEnd();
  }
}

}
}