arrow_marker.cpp

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/*
 * Copyright (c) 2009, 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:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * 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
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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#include <rviz/ogre_helpers/ogre_vector.h>
#include <OgreQuaternion.h>
#include <OgreSceneNode.h>
#include <OgreSceneManager.h>
#include <OgreEntity.h>
 
#include <rviz/default_plugin/marker_display.h>
#include <rviz/default_plugin/markers/marker_selection_handler.h>
#include <rviz/display_context.h>
#include <rviz/ogre_helpers/arrow.h>
#include <rviz/ogre_helpers/shape.h>
#include <rviz/selection/selection_manager.h>
 
#include <rviz/default_plugin/markers/arrow_marker.h>
 
namespace rviz
{
ArrowMarker::ArrowMarker(MarkerDisplay* owner, DisplayContext* context, Ogre::SceneNode* parent_node)
  : MarkerBase(owner, context, parent_node), arrow_(nullptr), last_arrow_set_from_points_(false)
{
  child_scene_node_ = scene_node_->createChildSceneNode();
}
 
ArrowMarker::~ArrowMarker()
{
  delete arrow_;
  context_->getSceneManager()->destroySceneNode(child_scene_node_);
}
 
void ArrowMarker::setDefaultProportions()
{
  arrow_->set(0.77, 1.0, 0.23, 2.0);
}
 
void ArrowMarker::onNewMessage(const MarkerConstPtr& /*old_message*/, const MarkerConstPtr& new_message)
{
  ROS_ASSERT(new_message->type == visualization_msgs::Marker::ARROW);
  ROS_ASSERT(new_message->points.empty() || new_message->points.size() >= 2);
 
  if (!arrow_)
  {
    arrow_ = new Arrow(context_->getSceneManager(), child_scene_node_);
    setDefaultProportions();
    handler_.reset(
        new MarkerSelectionHandler(this, MarkerID(new_message->ns, new_message->id), context_));
    handler_->addTrackedObjects(arrow_->getSceneNode());
  }
 
  Ogre::Vector3 pos, scale;
  Ogre::Quaternion orient;
  if (!transform(new_message, pos, orient, scale))
  {
    scene_node_->setVisible(false);
    return;
  }
 
  scene_node_->setVisible(true);
  setPosition(pos);
  setOrientation(orient);
 
  arrow_->setColor(new_message->color.r, new_message->color.g, new_message->color.b,
                   new_message->color.a);
 
  // compute translation & rotation from the two points
  if (new_message->points.size() == 2)
  {
    last_arrow_set_from_points_ = true;
 
    Ogre::Vector3 point1(new_message->points[0].x, new_message->points[0].y, new_message->points[0].z);
    Ogre::Vector3 point2(new_message->points[1].x, new_message->points[1].y, new_message->points[1].z);
 
    Ogre::Vector3 direction = point2 - point1;
    float distance = direction.length();
 
    float head_length_proportion =
        0.23; // Seems to be a good value based on default in arrow.h of shaft:head ratio of 1:0.3
    float head_length = head_length_proportion * distance;
    if (new_message->scale.z != 0.0)
    {
      float length = new_message->scale.z;
      head_length = std::max<double>(0.0, std::min<double>(length, distance)); // clamp
    }
    float shaft_length = distance - head_length;
 
    arrow_->set(shaft_length, new_message->scale.x, head_length, new_message->scale.y);
 
    direction.normalise();
 
    // for some reason the arrow goes into the y direction by default
    Ogre::Quaternion orient = Ogre::Vector3::NEGATIVE_UNIT_Z.getRotationTo(direction);
 
    arrow_->setPosition(point1);
    arrow_->setOrientation(orient);
  }
  else
  {
    if (last_arrow_set_from_points_)
    {
      // Reset arrow to default proportions if we previously set it from points
      setDefaultProportions();
      last_arrow_set_from_points_ = false;
    }
    arrow_->setScale(scale);
 
    Ogre::Quaternion orient = Ogre::Vector3::NEGATIVE_UNIT_Z.getRotationTo(Ogre::Vector3(1, 0, 0));
    arrow_->setOrientation(orient);
  }
}
 
S_MaterialPtr ArrowMarker::getMaterials()
{
  S_MaterialPtr materials;
  extractMaterials(arrow_->getHead()->getEntity(), materials);
  extractMaterials(arrow_->getShaft()->getEntity(), materials);
  return materials;
}
 
} // namespace rviz