manipulatedCameraFrame.cpp

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

 Copyright (C) 2002-2013 Gilles Debunne. All rights reserved.

 This file is part of the QGLViewer library version 2.4.0.

 http://www.libqglviewer.com - contact@libqglviewer.com

 This file may be used under the terms of the GNU General Public License 
 versions 2.0 or 3.0 as published by the Free Software Foundation and
 appearing in the LICENSE file included in the packaging of this file.
 In addition, as a special exception, Gilles Debunne gives you certain 
 additional rights, described in the file GPL_EXCEPTION in this package.

 libQGLViewer uses dual licensing. Commercial/proprietary software must
 purchase a libQGLViewer Commercial License.

 This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

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

#include "domUtils.h"
#include "manipulatedCameraFrame.h"
#include "qglviewer.h"

#if QT_VERSION >= 0x040000
# include <QMouseEvent>
#endif

using namespace qglviewer;
using namespace std;

ManipulatedCameraFrame::ManipulatedCameraFrame()
  : driveSpeed_(0.0), flyUpVector_(0.0, 1.0, 0.0)
{
  setFlySpeed(0.0);
  removeFromMouseGrabberPool();

  connect(&flyTimer_, SIGNAL(timeout()), SLOT(flyUpdate()));
}

ManipulatedCameraFrame& ManipulatedCameraFrame::operator=(const ManipulatedCameraFrame& mcf)
{
  ManipulatedFrame::operator=(mcf);

  setFlySpeed(mcf.flySpeed());
  setFlyUpVector(mcf.flyUpVector());

  return *this;
}

ManipulatedCameraFrame::ManipulatedCameraFrame(const ManipulatedCameraFrame& mcf)
  : ManipulatedFrame(mcf)
{
  removeFromMouseGrabberPool();
  connect(&flyTimer_, SIGNAL(timeout()), SLOT(flyUpdate()));
  (*this)=(mcf);
}


void ManipulatedCameraFrame::spin()
{
  rotateAroundPoint(spinningQuaternion(), revolveAroundPoint());
}

#ifndef DOXYGEN

void ManipulatedCameraFrame::flyUpdate()
{
  static Vec flyDisp(0.0, 0.0, 0.0);
  switch (action_)
    {
    case QGLViewer::MOVE_FORWARD:
      flyDisp.z = -flySpeed();
      translate(localInverseTransformOf(flyDisp));
      break;
    case QGLViewer::MOVE_BACKWARD:
      flyDisp.z = flySpeed();
      translate(localInverseTransformOf(flyDisp));
      break;
    case QGLViewer::DRIVE:
      flyDisp.z = flySpeed() * driveSpeed_;
      translate(localInverseTransformOf(flyDisp));
      break;
    default:
      break;
    }

  // Needs to be out of the switch since ZOOM/fastDraw()/wheelEvent use this callback to trigger a final draw().
  // #CONNECTION# wheelEvent.
  Q_EMIT manipulated();
}
#endif

void ManipulatedCameraFrame::updateFlyUpVector()
{
  flyUpVector_ = inverseTransformOf(Vec(0.0, 1.0, 0.0));
}

//          S t a t e   s a v i n g   a n d   r e s t o r i n g               //

QDomElement ManipulatedCameraFrame::domElement(const QString& name, QDomDocument& document) const
{
  QDomElement e = ManipulatedFrame::domElement(name, document);
  QDomElement mcp = document.createElement("ManipulatedCameraParameters");
  mcp.setAttribute("flySpeed", QString::number(flySpeed()));
  mcp.appendChild(flyUpVector().domElement("flyUpVector", document));
  e.appendChild(mcp);
  return e;
}

void ManipulatedCameraFrame::initFromDOMElement(const QDomElement& element)
{
  // No need to initialize, since default flyUpVector and flySpeed are not meaningful.
  // It's better to keep current ones. And it would destroy constraint() and referenceFrame().
  // *this = ManipulatedCameraFrame();
  ManipulatedFrame::initFromDOMElement(element);

  QDomElement child=element.firstChild().toElement();
  while (!child.isNull())
    {
      if (child.tagName() == "ManipulatedCameraParameters")
        {
          setFlySpeed(DomUtils::floatFromDom(child, "flySpeed", flySpeed()));

          QDomElement schild=child.firstChild().toElement();
          while (!schild.isNull())
            {
              if (schild.tagName() == "flyUpVector")
                setFlyUpVector(Vec(schild));

              schild = schild.nextSibling().toElement();
            }
        }
      child = child.nextSibling().toElement();
    }
}


//                 M o u s e    h a n d l i n g                               //

#ifndef DOXYGEN

void ManipulatedCameraFrame::startAction(int ma, bool withConstraint)
{
  ManipulatedFrame::startAction(ma, withConstraint);

  switch (action_)
    {
    case QGLViewer::MOVE_FORWARD:
    case QGLViewer::MOVE_BACKWARD:
    case QGLViewer::DRIVE:
#if QT_VERSION >= 0x040000
      flyTimer_.setSingleShot(false);
#endif
      flyTimer_.start(10);
      break;
    default:
      break;
    }
}
#endif

void ManipulatedCameraFrame::mouseMoveEvent(QMouseEvent* const event, Camera* const camera)
{
  // #CONNECTION# QGLViewer::mouseMoveEvent does the updateGL.
  switch (action_)
    {
    case QGLViewer::TRANSLATE:
      {
        const QPoint delta = prevPos_ - event->pos();
        Vec trans(static_cast<float>(delta.x()), static_cast<float>(-delta.y()), 0.0);
        // Scale to fit the screen mouse displacement
        switch (camera->type())
          {
          case Camera::PERSPECTIVE :
            trans *= 2.0 * tan(camera->fieldOfView()/2.0) *
              fabs((camera->frame()->coordinatesOf(revolveAroundPoint())).z) / camera->screenHeight();
            break;
          case Camera::ORTHOGRAPHIC :
            {
              GLdouble w,h;
              camera->getOrthoWidthHeight(w, h);
              trans[0] *= 2.0 * w / camera->screenWidth();
              trans[1] *= 2.0 * h / camera->screenHeight();
              break;
            }
          }
        translate(inverseTransformOf(translationSensitivity()*trans));
        break;
      }

    case QGLViewer::MOVE_FORWARD:
      {
        Quaternion rot = pitchYawQuaternion(event->x(), event->y(), camera);
        rotate(rot);
        //#CONNECTION# wheelEvent MOVE_FORWARD case
        // actual translation is made in flyUpdate().
        //translate(inverseTransformOf(Vec(0.0, 0.0, -flySpeed())));
        break;
      }

    case QGLViewer::MOVE_BACKWARD:
      {
        Quaternion rot = pitchYawQuaternion(event->x(), event->y(), camera);
        rotate(rot);
        // actual translation is made in flyUpdate().
        //translate(inverseTransformOf(Vec(0.0, 0.0, flySpeed())));
        break;
      }

    case QGLViewer::DRIVE:
      {
        Quaternion rot = turnQuaternion(event->x(), camera);
        rotate(rot);
        // actual translation is made in flyUpdate().
        driveSpeed_ = 0.01 * (event->y() - pressPos_.y());
        break;
      }

    case QGLViewer::ZOOM:
      {
        //#CONNECTION# wheelEvent() ZOOM case
        const float coef = qMax(fabsf((camera->frame()->coordinatesOf(camera->revolveAroundPoint())).z), 0.2f*camera->sceneRadius());
        Vec trans(0.0, 0.0, -coef * (event->y() - prevPos_.y()) / camera->screenHeight());
        translate(inverseTransformOf(trans));
        break;
      }

    case QGLViewer::LOOK_AROUND:
      {
        Quaternion rot = pitchYawQuaternion(event->x(), event->y(), camera);
        rotate(rot);
        break;
      }

    case QGLViewer::ROTATE:
      {
        Vec trans = camera->projectedCoordinatesOf(revolveAroundPoint());
        Quaternion rot = deformedBallQuaternion(event->x(), event->y(), trans[0], trans[1], camera);
        //#CONNECTION# These two methods should go together (spinning detection and activation)
        computeMouseSpeed(event);
        setSpinningQuaternion(rot);
        spin();
        break;
      }

    case QGLViewer::SCREEN_ROTATE:
      {
        Vec trans = camera->projectedCoordinatesOf(revolveAroundPoint());

        const float angle = atan2(event->y() - trans[1], event->x() - trans[0]) - atan2(prevPos_.y()-trans[1], prevPos_.x()-trans[0]);

        Quaternion rot(Vec(0.0, 0.0, 1.0), angle);
        //#CONNECTION# These two methods should go together (spinning detection and activation)
        computeMouseSpeed(event);
        setSpinningQuaternion(rot);
        spin();
        updateFlyUpVector();
        break;
      }

    case QGLViewer::ROLL:
      {
        const float angle = M_PI * (event->x() - prevPos_.x()) / camera->screenWidth();
        Quaternion rot(Vec(0.0, 0.0, 1.0), angle);
        rotate(rot);
        setSpinningQuaternion(rot);
        updateFlyUpVector();
        break;
      }

    case QGLViewer::SCREEN_TRANSLATE:
      {
        Vec trans;
        int dir = mouseOriginalDirection(event);
        if (dir == 1)
          trans.setValue(static_cast<float>(prevPos_.x() - event->x()), 0.0, 0.0);
        else if (dir == -1)
          trans.setValue(0.0, static_cast<float>(event->y() - prevPos_.y()), 0.0);

        switch (camera->type())
          {
          case Camera::PERSPECTIVE :
            trans *= 2.0 * tan(camera->fieldOfView()/2.0) *
              fabs((camera->frame()->coordinatesOf(revolveAroundPoint())).z) / camera->screenHeight();
            break;
          case Camera::ORTHOGRAPHIC :
            {
              GLdouble w,h;
              camera->getOrthoWidthHeight(w, h);
              trans[0] *= 2.0 * w / camera->screenWidth();
              trans[1] *= 2.0 * h / camera->screenHeight();
              break;
            }
          }

        translate(inverseTransformOf(translationSensitivity()*trans));
        break;
      }

    case QGLViewer::ZOOM_ON_REGION:
    case QGLViewer::NO_MOUSE_ACTION:
      break;
    }

  if (action_ != QGLViewer::NO_MOUSE_ACTION)
    {
      prevPos_ = event->pos();
      if (action_ != QGLViewer::ZOOM_ON_REGION)
        // ZOOM_ON_REGION should not emit manipulated().
        // prevPos_ is used to draw rectangle feedback.
        Q_EMIT manipulated();
    }
}


void ManipulatedCameraFrame::mouseReleaseEvent(QMouseEvent* const event, Camera* const camera)
{
  if ((action_ == QGLViewer::MOVE_FORWARD) || (action_ == QGLViewer::MOVE_BACKWARD) || (action_ == QGLViewer::DRIVE))
    flyTimer_.stop();

  if (action_ == QGLViewer::ZOOM_ON_REGION)
    camera->fitScreenRegion(QRect(pressPos_, event->pos()));

  ManipulatedFrame::mouseReleaseEvent(event, camera);
}

void ManipulatedCameraFrame::wheelEvent(QWheelEvent* const event, Camera* const camera)
{
  //#CONNECTION# QGLViewer::setWheelBinding, ManipulatedFrame::wheelEvent.
  switch (action_)
    {
    case QGLViewer::ZOOM:
      {
        const float wheelSensitivityCoef = 8E-4f;
        //#CONNECTION# mouseMoveEvent() ZOOM case
        const float coef = qMax(fabsf((camera->frame()->coordinatesOf(camera->revolveAroundPoint())).z), 0.2f*camera->sceneRadius());
        Vec trans(0.0, 0.0, coef * event->delta() * wheelSensitivity() * wheelSensitivityCoef);
        translate(inverseTransformOf(trans));
        Q_EMIT manipulated();
        break;
      }
    case QGLViewer::MOVE_FORWARD:
    case QGLViewer::MOVE_BACKWARD:
      //#CONNECTION# mouseMoveEvent() MOVE_FORWARD case
      translate(inverseTransformOf(Vec(0.0, 0.0, 0.2*flySpeed()*event->delta())));
      Q_EMIT manipulated();
      break;
    default:
      break;
    }

  // #CONNECTION# startAction should always be called before
  if (previousConstraint_)
    setConstraint(previousConstraint_);

  // The wheel triggers a fastDraw. A final updateGL is needed after the last wheel event to
  // polish the rendering using draw(). Since the last wheel event does not say its name, we use
  // the flyTimer_ to trigger flyUpdate(), which emits manipulated. Two wheel events
  // separated by more than this delay milliseconds will trigger a draw().
  const int finalDrawAfterWheelEventDelay = 400;

  // Starts (or prolungates) the timer.
#if QT_VERSION >= 0x040000
  flyTimer_.setSingleShot(true);
  flyTimer_.start(finalDrawAfterWheelEventDelay);
#else
  flyTimer_.start(finalDrawAfterWheelEventDelay, true);
#endif

  // This could also be done *before* manipulated is emitted, so that isManipulated() returns false.
  // But then fastDraw would not be used with wheel.
  // Detecting the last wheel event and forcing a final draw() is done using the timer_.
  action_ = QGLViewer::NO_MOUSE_ACTION;
}


Quaternion ManipulatedCameraFrame::turnQuaternion(int x, const Camera* const camera)
{
  return Quaternion(Vec(0.0, 1.0, 0.0), rotationSensitivity()*(prevPos_.x()-x)/camera->screenWidth());
}

Quaternion ManipulatedCameraFrame::pitchYawQuaternion(int x, int y, const Camera* const camera)
{
  const Quaternion rotX(Vec(1.0, 0.0, 0.0), rotationSensitivity()*(prevPos_.y()-y)/camera->screenHeight());
  const Quaternion rotY(transformOf(flyUpVector()), rotationSensitivity()*(prevPos_.x()-x)/camera->screenWidth());
  return rotY * rotX;
}