geometry.cpp

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/*
 * Copyright (c) 2012, Willow Garage, Inc.
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are met:
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 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#include <OGRE/OgreRay.h>
#include <OGRE/OgrePlane.h>
#include <OGRE/OgreCamera.h>
#include <OGRE/OgreSceneNode.h>
#include <OGRE/OgreViewport.h>

#include "geometry.h"

namespace rviz
{

bool getPointOnPlaneFromWindowXY( Ogre::Viewport* viewport,
                                  Ogre::Plane& plane,
                                  int window_x, int window_y,
                                  Ogre::Vector3& intersection_out )
{
  int width = viewport->getActualWidth();
  int height = viewport->getActualHeight();

  Ogre::Ray mouse_ray = viewport->getCamera()->getCameraToViewportRay( (float)window_x / (float)width,
                                                                       (float)window_y / (float)height );
  std::pair<bool, Ogre::Real> intersection = mouse_ray.intersects( plane );
  if ( !intersection.first )
  {
    return false;
  }
  intersection_out = mouse_ray.getPoint( intersection.second );

  return true;
}

float mapAngleTo0_2Pi( float angle )
{
  angle = fmod( angle, Ogre::Math::TWO_PI );

  if( angle < 0.0f )
  {
    angle = Ogre::Math::TWO_PI + angle;
  }
  return angle;
}

Ogre::Vector2 project3DPointToViewportXY(const Ogre::Viewport* view, const Ogre::Vector3& pos)
{
  Ogre::Camera* cam = view->getCamera();
  Ogre::Vector3 pos2D = cam->getProjectionMatrix() * (cam->getViewMatrix() * pos);

  Ogre::Real x = ((pos2D.x * 0.5) + 0.5);
  Ogre::Real y = 1 - ((pos2D.y * 0.5) + 0.5);

  return  Ogre::Vector2(x * view->getActualWidth(), y * view->getActualHeight());
}

} // end namespace rviz