frame_position_tracking_view_controller.cpp

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/*
 * Copyright (c) 2012, Willow Garage, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
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 *       notice, this list of conditions and the following disclaimer.
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 *       notice, this list of conditions and the following disclaimer in the
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 *     * Neither the name of the Willow Garage, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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#include <OgreCamera.h>
#include <OgreSceneManager.h>
#include <OgreSceneNode.h>

#include "rviz/display_context.h"
#include "rviz/frame_manager.h"
#include "rviz/properties/enum_property.h"
#include "rviz/properties/tf_frame_property.h"
#include "rviz/viewport_mouse_event.h"
#include "rviz/view_manager.h"

#include "rviz/frame_position_tracking_view_controller.h"

namespace rviz
{

FramePositionTrackingViewController::FramePositionTrackingViewController()
  : target_scene_node_( NULL )
{
  target_frame_property_ = new TfFrameProperty( "Target Frame", TfFrameProperty::FIXED_FRAME_STRING,
                                                "TF frame whose motion this view will follow.", this, NULL, true );
}

void FramePositionTrackingViewController::onInitialize()
{
  target_frame_property_->setFrameManager( context_->getFrameManager() );

  target_scene_node_ = context_->getSceneManager()->getRootSceneNode()->createChildSceneNode();
  camera_->detachFromParent();
  target_scene_node_->attachObject( camera_ );
}

FramePositionTrackingViewController::~FramePositionTrackingViewController()
{
  context_->getSceneManager()->destroySceneNode( target_scene_node_ );
}

void FramePositionTrackingViewController::onActivate()
{
  updateTargetSceneNode();

  // Before activation, changes to target frame property should have
  // no side-effects.  After activation, changing target frame
  // property has the side effect (typically) of changing an offset
  // property so that the view does not jump.  Therefore we make the
  // signal/slot connection from the property here in onActivate()
  // instead of in the constructor.
  connect( target_frame_property_, SIGNAL( changed() ), this, SLOT( updateTargetFrame() ));
}

void FramePositionTrackingViewController::update(float dt, float ros_dt)
{
  updateTargetSceneNode();
}

void FramePositionTrackingViewController::updateTargetFrame()
{
  Ogre::Vector3 old_position = target_scene_node_->getPosition();
  Ogre::Quaternion old_orientation = target_scene_node_->getOrientation();

  updateTargetSceneNode();
  
  onTargetFrameChanged( old_position, old_orientation );
}

bool FramePositionTrackingViewController::getNewTransform()
{
  Ogre::Vector3 new_reference_position;
  Ogre::Quaternion new_reference_orientation;

  bool got_transform = context_->getFrameManager()->getTransform( target_frame_property_->getFrameStd(), ros::Time(),
        new_reference_position, new_reference_orientation );
  if( got_transform )
  {
    reference_position_ = new_reference_position;
    reference_orientation_ = new_reference_orientation;
  }
  return got_transform;
}

void FramePositionTrackingViewController::updateTargetSceneNode()
{
  if ( getNewTransform() )
  {
    target_scene_node_->setPosition( reference_position_ );

    context_->queueRender();
  }

// Need to incorporate this functionality somehow....  Maybe right into TfFrameProperty itself.

}

void FramePositionTrackingViewController::mimic( ViewController* source_view )
{
  QVariant target_frame = source_view->subProp( "Target Frame" )->getValue();
  if( target_frame.isValid() )
  {
    target_frame_property_->setValue( target_frame );
  }
}

} // end namespace rviz