CursorPainter.cc 8.7 KB
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/*===========================================================================*\
 *                                                                           *
 *                              OpenFlipper                                  *
 *      Copyright (C) 2001-2009 by Computer Graphics Group, RWTH Aachen      *
 *                           www.openflipper.org                             *
 *                                                                           *
 *---------------------------------------------------------------------------*
 *  This file is part of OpenFlipper.                                        *
 *                                                                           *
 *  OpenFlipper is free software: you can redistribute it and/or modify      *
 *  it under the terms of the GNU Lesser General Public License as           *
 *  published by the Free Software Foundation, either version 3 of           *
 *  the License, or (at your option) any later version with the              *
 *  following exceptions:                                                    *
 *                                                                           *
 *  If other files instantiate templates or use macros                       *
 *  or inline functions from this file, or you compile this file and         *
 *  link it with other files to produce an executable, this file does        *
 *  not by itself cause the resulting executable to be covered by the        *
 *  GNU Lesser General Public License. This exception does not however       *
 *  invalidate any other reasons why the executable file might be            *
 *  covered by the GNU Lesser General Public License.                        *
 *                                                                           *
 *  OpenFlipper 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 Lesser General Public License for more details.                      *
 *                                                                           *
 *  You should have received a copy of the GNU LesserGeneral Public          *
 *  License along with OpenFlipper. If not,                                  *
 *  see <http://www.gnu.org/licenses/>.                                      *
 *                                                                           *
\*===========================================================================*/




//=============================================================================
//
//  CLASS CursorPainter - IMPLEMENTATION
//
//=============================================================================

//== INCLUDES =================================================================

#include <QPixmap>
#include <QImage>
#include <QBitmap>

#include <OpenFlipper/common/GlobalOptions.hh>

#include "CursorPainter.hh"
#include "QtBaseViewer.hh"

//== NAMESPACES ===============================================================

CursorPainter::CursorPainter (QObject *_parent) :
  QObject(_parent),
  cursor_(),
  initialized_(false),
  enabled_(false),
  mouseIn_(false),
  texture_(0),
  hasCursor_(false)
{
}

//-----------------------------------------------------------------------------

CursorPainter::~CursorPainter ()
{
  if (initialized_)
  {
    glDeleteTextures (1, &texture_);
  }
}

//-----------------------------------------------------------------------------

void CursorPainter::setCursor (const QCursor &_cursor)
{
  cursor_ = _cursor;
  cursorToTexture ();
  if (!(initialized_ && enabled_ && hasCursor_))
    foreach (glViewer *v, views_)
      v->setCursor (cursor_);
}

//-----------------------------------------------------------------------------

void CursorPainter::initializeGL()
{
  if (initialized_)
    return;
  initialized_ = true;

  // setup cursor texture
  glGenTextures (1, &texture_);

  glBindTexture (GL_TEXTURE_2D, texture_);
  glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP );
  glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );
  glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
  glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
  glBindTexture (GL_TEXTURE_2D, 0);

  cursorToTexture ();

  if (enabled_ && hasCursor_)
  {
    foreach (glViewer *v, views_)
      v->setCursor (Qt::BlankCursor);
  }
  else
  {
    foreach (glViewer *v, views_)
      v->setCursor (cursor_);
  }
}

//-----------------------------------------------------------------------------

void CursorPainter::registerViewer(glViewer * _viewer)
{
  views_.append (_viewer);
  _viewer->setCursorPainter (this);
}

//-----------------------------------------------------------------------------

void CursorPainter::paintCursor (ACG::GLState *_state)
{
  if (!initialized_)
    return;

  if (!enabled())
    return;

  // project (0, 0, 0) to get its position on the screen
  ACG::Vec3d zPos = _state->project (ACG::Vec3d (0.0, 0.0, 0.0));
  // unproject the result translated by 1px in x and y
  zPos = _state->unproject (ACG::Vec3d (zPos[0] + 1, zPos[1] + 1, zPos[2]));

  // this gives us the size of one pixel in the current scene transformation
  // now we can paint the cursor always with the same width/height
  float xscale = zPos[0];
  float yscale = -zPos[1];

  glPushAttrib (GL_ALL_ATTRIB_BITS);

  glDisable (GL_DEPTH_TEST);
  glDisable(GL_LIGHTING);
  glEnable(GL_BLEND);

  glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

  // bind texture
  glEnable (GL_TEXTURE_2D);
  glBindTexture (GL_TEXTURE_2D, texture_);

  glColor4f (1.0, 1.0, 1.0, 1.0);

  float x1 = -xOff_ * xscale;
  float x2 = (32 - xOff_) * xscale;
  float y1 = -yOff_ * yscale;
  float y2 = (32 - yOff_) * yscale;

  // draw cursor quad
  glBegin (GL_QUADS);
  glTexCoord2f (0, 0);
  glVertex3f (x1, y1, 0);
  glTexCoord2f (0, 1);
  glVertex3f (x1, y2, 0);
  glTexCoord2f (1, 1);
  glVertex3f (x2, y2, 0);
  glTexCoord2f (1, 0);
  glVertex3f (x2, y1, 0);
  glEnd ();


  glPopAttrib ();
}

//-----------------------------------------------------------------------------

void CursorPainter::updateCursorPosition (QPointF _scenePos)
{
  cursorPos_ = _scenePos;
  setMouseIn (true);
}

//-----------------------------------------------------------------------------

QPointF CursorPainter::cursorPosition()
{
  return cursorPos_;
}

//-----------------------------------------------------------------------------

void CursorPainter::setEnabled(bool _enabled)
{
  enabled_ = _enabled;

  if (initialized_)
  {
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    if (_enabled && hasCursor_)
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    {
      foreach (glViewer *v, views_)
        v->setCursor (Qt::BlankCursor);
    }
    else
    {
      foreach (glViewer *v, views_)
        v->setCursor (cursor_);
    }
  }
}

//-----------------------------------------------------------------------------

bool CursorPainter::enabled()
{
  return initialized_ && enabled_ && hasCursor_ && mouseIn_;
}

//-----------------------------------------------------------------------------

void CursorPainter::cursorToTexture()
{
  if (!initialized_)
    return;

  unsigned char buf[4096];
  QImage cImg;

  hasCursor_ = false;

  switch (cursor_.shape())
  {
    case Qt::ArrowCursor:
      cImg.load (OpenFlipper::Options::iconDirStr()+OpenFlipper::Options::dirSeparator()+"cursor_arrow.png");
      xOff_ = 0;
      yOff_ = 0;
      break;
    case Qt::PointingHandCursor:
      cImg.load (OpenFlipper::Options::iconDirStr()+OpenFlipper::Options::dirSeparator()+"cursor_hand.png");
      xOff_ = 7;
      yOff_ = 1;
      break;
    default:
      return;
  }

  if (cImg.width () != 32 || cImg.height () != 32)
    return;

  // convert ARGB QImage to RGBA for gl
  int index = 0;
  for (int y = 0; y < cImg.height (); y++)
    for (int x = 0; x < cImg.width (); x++)
      {
        QRgb pix = cImg.pixel (x, y);
        buf[index] = qRed (pix);
        buf[index+1] = qGreen (pix);
        buf[index+2] = qBlue (pix);
        buf[index+3] = qAlpha (pix);
        index += 4;
      }

  glEnable (GL_TEXTURE_2D);
  glBindTexture (GL_TEXTURE_2D, texture_);
  glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, 32, 32, 0,
                GL_RGBA, GL_UNSIGNED_BYTE, buf);
  glBindTexture (GL_TEXTURE_2D, 0);
  glDisable (GL_TEXTURE_2D);

  hasCursor_ = true;
}

//-----------------------------------------------------------------------------

void CursorPainter::setMouseIn(bool _in)
{
  mouseIn_ = _in;
}

//-----------------------------------------------------------------------------

QRectF CursorPainter::cursorBoundingBox()
{
  return QRectF (-xOff_, -yOff_, 32, 32);
}

//=============================================================================
//=============================================================================