/****************************************************************************

 Copyright (C) 2002-2006 Gilles Debunne (Gilles.Debunne@imag.fr)

This file is part of the QGLViewer library.
 Version 2.2.4-1, released on December 12, 2006.

 http://artis.imag.fr/Members/Gilles.Debunne/QGLViewer

 libQGLViewer is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 libQGLViewer 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 General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with libQGLViewer; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*****************************************************************************/

#include "mouseGrabber.h"

using namespace qglviewer;
using namespace std;

void CameraPathPlayer::checkIfGrabsMouse(int x, int y, const Camera* const)
{
  // Rectangular activation array - May have to be tune depending on your default font size
  setGrabsMouse((x < 80) && (y<yPos()) && ((yPos()-y) < 16));
}

void Viewer::displayPlayers()
{
  for (int i=0; i<nbPlayers_; ++i)
    {
      CameraPathPlayer* cpp = player_[i];
      if (cpp)
	{
	  QString s;
	  if (cpp->grabsMouse())
	    {
	      glColor3f(1,1,1);
	      if (camera()->keyFrameInterpolator(i)->numberOfKeyFrames() > 1)
		s = "Play path F" + QString::number(i);
	      else
		s = "Restore pos F" + QString::number(i);
	    }
	  else
	    {
	      glColor3f(0.6, 0.6, 0.6);
	      if (camera()->keyFrameInterpolator(i)->numberOfKeyFrames() > 1)
		s = "Path F" + QString::number(i);
	      else
		s = "Pos F" + QString::number(i);
	    }
	  drawText(10, cpp->yPos()-3, s);
	}
    }
}


void Viewer::updatePlayers()
{
  for (int i=0; i<nbPlayers_; ++i)
    {
      // Check if CameraPathPlayer is still valid
      if ((player_[i]) && (!camera()->keyFrameInterpolator(i)))
	{
	  delete player_[i];
	  player_[i] = NULL;
	}
      // Or add it if needed
      if ((camera()->keyFrameInterpolator(i)) && (!player_[i]))
	player_[i] = new CameraPathPlayer(i);
    }
}


void Viewer::init()
{
  // Absolutely needed for MouseGrabber
  setMouseTracking(true);

  // In order to make the manipulatedFrame displacements clearer
  setAxisIsDrawn();

  // Initialize the CameraPathPlayer MouseGrabber array
  nbPlayers_ = 12;
  player_ = new CameraPathPlayer*[nbPlayers_];
  for (int i=0; i<nbPlayers_; ++i)
    player_[i] = NULL;

  // Create a scene with several spirals.
  const int nbSpirals = 7;
  for (int i = -nbSpirals/2; i<=nbSpirals/2; ++i)
    {
      Spiral s;
      s.setPosition(Vec(1.8f*i/nbSpirals, 0.0f, 0.0f));
      spiral_.push_back(s);
    }

  restoreStateFromFile();

  help();
}


void Viewer::draw()
{
#if QT_VERSION < 0x040000
  for (QValueVector<Spiral>::const_iterator it=spiral_.begin(), end=spiral_.end(); it != end; ++it)
#else
  for (QList<Spiral>::const_iterator it=spiral_.begin(), end=spiral_.end(); it != end; ++it)
#endif
    (*it).draw();

  updatePlayers();
  glDisable(GL_LIGHTING);
  displayPlayers();
  glEnable(GL_LIGHTING);
}


QString Viewer::helpString() const
{
  QString text("<h2>M o u s e G r a b b e r </h2>");
  text += "This example illustrates the use of <i>MouseGrabber</i>, which is an abstract ";
  text += "class for objects that react (usually when the mouse hovers over them).<br><br>";
  text += "Define new camera paths (or positions) using <b>Alt</b>+[<b>F1</b>-<b>F12</b>]. ";
  text += "New <i>MouseGrabbers</i> are then created and displayed in the upper left corner. ";
  text += "Note how they react when the mouse hovers, and click them to play the associated path.<br><br>";
  text += "<i>ManipulatedFrame</i>, such as the ones which define the spirals' positions, are ";
  text += "also <i>MouseGrabbers</i>. When the mouse is close to the spiral center, the <i>ManipulatedFrame</i> ";
  text += "will grab to mouse click (as if the <b>Control</b> key was pressed). This is very convenient ";
  text += "to intuitively move scene objects (such as lights) without any key or GUI interaction.<br><br>";
  text += "Note that <code>setMouseTracking()</code> must be enabled to use <i>MouseGrabbers</i>.";
  return text;
}

void Spiral::draw() const
{
  glPushMatrix();
  glMultMatrixd(mf_.matrix());

  // Draw a spiral
  const float nbSteps = 100.0;
  glBegin(GL_QUAD_STRIP);
  for (float i=0; i<nbSteps; ++i)
    {
      float ratio = i/nbSteps;
      float angle = 21.0*ratio;
      float c = cos(angle);
      float s = sin(angle);
      float r1 = 0.2 - 0.15*ratio;
      float r2 = 0.16 - 0.15*ratio;
      float alt = 0.2f * (ratio - 0.5);
      const float nor = .5;
      const float up = sqrt(1.0-nor*nor);

      if (mf_.grabsMouse())
	glColor3f(1-ratio, 0.8f , ratio/2.0);
      else
	glColor3f(1-ratio, 0.2f , ratio);

      glNormal3f(nor*c, up, nor*s);
      glVertex3f(r1*c, alt, r1*s);
      glVertex3f(r2*c, alt+0.01, r2*s);
    }
  glEnd();

  glPopMatrix();
}