src/Main/CameraGroup.cxx

   1 // Copyright (C) 2008  Tim Moore
   2 //
   3 // This program is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU General Public License as
   5 // published by the Free Software Foundation; either version 2 of the
   6 // License, or (at your option) any later version.
   7 //
   8 // This program is distributed in the hope that it will be useful, but
   9 // WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 // General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU General Public License
  14 // along with this program; if not, write to the Free Software
  15 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16
  17 #include "CameraGroup.hxx"
  18
  19 #include "globals.hxx"
  20 #include "renderer.hxx"
  21 #include "FGEventHandler.hxx"
  22 #include "WindowBuilder.hxx"
  23 #include "WindowSystemAdapter.hxx"
  24 #include <simgear/props/props.hxx>
  25 #include <simgear/scene/util/RenderConstants.hxx>
  26
  27 #include <algorithm>
  28 #include <cstring>
  29 #include <string>
  30
  31 #include <osg/Camera>
  32 #include <osg/GraphicsContext>
  33 #include <osg/Math>
  34 #include <osg/Matrix>
  35 #include <osg/Quat>
  36 #include <osg/Vec3d>
  37 #include <osg/Viewport>
  38
  39 #include <osgUtil/IntersectionVisitor>
  40
  41 #include <osgViewer/GraphicsWindow>
  42
  43 namespace flightgear
  44 {
  45 using namespace osg;
  46
  47 using std::strcmp;
  48 using std::string;
  49
  50 ref_ptr<CameraGroup> CameraGroup::_defaultGroup;
  51
  52 CameraGroup::CameraGroup(osgViewer::Viewer* viewer) :
  53     _viewer(viewer)
  54 {
  55 }
  56
  57 }
  58
  59 namespace
  60 {
  61 using namespace osg;
  62
  63 // Given a projection matrix, return a new one with the same frustum
  64 // sides and new near / far values.
  65
  66 void makeNewProjMat(Matrixd& oldProj, double znear,
  67                                        double zfar, Matrixd& projection)
  68 {
  69     projection = oldProj;
  70     // Slightly inflate the near & far planes to avoid objects at the
  71     // extremes being clipped out.
  72     znear *= 0.999;
  73     zfar *= 1.001;
  74
  75     // Clamp the projection matrix z values to the range (near, far)
  76     double epsilon = 1.0e-6;
  77     if (fabs(projection(0,3)) < epsilon &&
  78         fabs(projection(1,3)) < epsilon &&
  79         fabs(projection(2,3)) < epsilon) {
  80         // Projection is Orthographic
  81         epsilon = -1.0/(zfar - znear); // Used as a temp variable
  82         projection(2,2) = 2.0*epsilon;
  83         projection(3,2) = (zfar + znear)*epsilon;
  84     } else {
  85         // Projection is Perspective
  86         double trans_near = (-znear*projection(2,2) + projection(3,2)) /
  87             (-znear*projection(2,3) + projection(3,3));
  88         double trans_far = (-zfar*projection(2,2) + projection(3,2)) /
  89             (-zfar*projection(2,3) + projection(3,3));
  90         double ratio = fabs(2.0/(trans_near - trans_far));
  91         double center = -0.5*(trans_near + trans_far);
  92
  93         projection.postMult(osg::Matrixd(1.0, 0.0, 0.0, 0.0,
  94                                          0.0, 1.0, 0.0, 0.0,
  95                                          0.0, 0.0, ratio, 0.0,
  96                                          0.0, 0.0, center*ratio, 1.0));
  97     }
  98 }
  99
 100 void installCullVisitor(Camera* camera)
 101 {
 102 #if 0 // Not yet
 103     osgViewer::Renderer* renderer
 104         = static_cast<osgViewer::Renderer*>(camera->getRenderer());
 105     for (int i = 0; i < 2; ++i) {
 106         osgUtil::SceneView* sceneView = renderer->getSceneView(i);
 107         sceneView->setCullVisitor(new simgear::EffectCullVisitor);
 108     }
 109 #endif
 110 }
 111 }
 112
 113 namespace flightgear
 114 {
 115 void updateCameras(const CameraInfo* info)
 116 {
 117     if (info->camera.valid())
 118         info->camera->getViewport()->setViewport(info->x, info->y,
 119                                                  info->width, info->height);
 120     if (info->farCamera.valid())
 121         info->farCamera->getViewport()->setViewport(info->x, info->y,
 122                                                     info->width, info->height);
 123 }
 124
 125 CameraInfo* CameraGroup::addCamera(unsigned flags, Camera* camera,
 126                                    const Matrix& view,
 127                                    const Matrix& projection,
 128                                    bool useMasterSceneData)
 129 {
 130     CameraInfo* info = new CameraInfo(flags);
 131     // The camera group will always update the camera
 132     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
 133
 134     Camera* farCamera = 0;
 135     if ((flags & (GUI | ORTHO)) == 0) {
 136         farCamera = osg::clone(camera);
 137         farCamera->setGraphicsContext(camera->getGraphicsContext());
 138         // Each camera's viewport is written when the window is
 139         // resized; if the the viewport isn't copied here, it gets updated
 140         // twice and ends up with the wrong value.
 141         farCamera->setViewport(osg::clone(camera->getViewport()));
 142         _viewer->addSlave(farCamera, view, projection, useMasterSceneData);
 143         installCullVisitor(farCamera);
 144         info->farCamera = farCamera;
 145         info->farSlaveIndex = _viewer->getNumSlaves() - 1;
 146         farCamera->setRenderOrder(Camera::NESTED_RENDER, info->farSlaveIndex);
 147         camera->setCullMask(camera->getCullMask() & ~simgear::BACKGROUND_BIT);
 148     }
 149     camera->setClearMask(GL_DEPTH_BUFFER_BIT);
 150     _viewer->addSlave(camera, view, projection, useMasterSceneData);
 151     installCullVisitor(camera);
 152     info->camera = camera;
 153     info->slaveIndex = _viewer->getNumSlaves() - 1;
 154     camera->setRenderOrder(Camera::NESTED_RENDER, info->slaveIndex);
 155     _cameras.push_back(info);
 156     return info;
 157 }
 158
 159 void CameraGroup::update(const osg::Vec3d& position,
 160                          const osg::Quat& orientation)
 161 {
 162     const Matrix masterView(osg::Matrix::translate(-position)
 163                             * osg::Matrix::rotate(orientation.inverse()));
 164     _viewer->getCamera()->setViewMatrix(masterView);
 165     const Matrix& masterProj = _viewer->getCamera()->getProjectionMatrix();
 166     for (CameraList::iterator i = _cameras.begin(); i != _cameras.end(); ++i) {
 167         const CameraInfo* info = i->get();
 168         const View::Slave& slave = _viewer->getSlave(info->slaveIndex);
 169         // refreshes camera viewports (for now)
 170         updateCameras(info);
 171         Camera* camera = info->camera.get();
 172         Matrix viewMatrix;
 173         if ((info->flags & VIEW_ABSOLUTE) != 0)
 174             viewMatrix = slave._viewOffset;
 175         else
 176             viewMatrix = masterView * slave._viewOffset;
 177         camera->setViewMatrix(viewMatrix);
 178         Matrix projectionMatrix;
 179         if ((info->flags & PROJECTION_ABSOLUTE) != 0)
 180             projectionMatrix = slave._projectionOffset;
 181         else
 182             projectionMatrix = masterProj * slave._projectionOffset;
 183
 184         if (!info->farCamera.valid()) {
 185             camera->setProjectionMatrix(projectionMatrix);
 186         } else {
 187             Camera* farCamera = info->farCamera.get();
 188             farCamera->setViewMatrix(viewMatrix);
 189             double left, right, bottom, top, parentNear, parentFar;
 190             projectionMatrix.getFrustum(left, right, bottom, top,
 191                                         parentNear, parentFar);
 192             if (parentFar < 100.0) {
 193                 camera->setProjectionMatrix(projectionMatrix);
 194                 camera->setCullMask(camera->getCullMask()
 195                                     | simgear::BACKGROUND_BIT);
 196                 farCamera->setNodeMask(0);
 197             } else {
 198                 Matrix nearProj, farProj;
 199                 makeNewProjMat(projectionMatrix, parentNear, 100.0, nearProj);
 200                 makeNewProjMat(projectionMatrix, 100.0, parentFar, farProj);
 201                 camera->setProjectionMatrix(nearProj);
 202                 camera->setCullMask(camera->getCullMask()
 203                                     & ~simgear::BACKGROUND_BIT);
 204                 farCamera->setProjectionMatrix(farProj);
 205                 farCamera->setNodeMask(camera->getNodeMask());
 206             }
 207         }
 208     }
 209 }
 210
 211 void CameraGroup::setCameraParameters(float vfov, float aspectRatio)
 212 {
 213     const float zNear = .1f;
 214     const float zFar = 120000.0f;
 215     _viewer->getCamera()->setProjectionMatrixAsPerspective(vfov,
 216                                                            1.0f / aspectRatio,
 217                                                            zNear, zFar);
 218 }
 219 }
 220
 221 namespace
 222 {
 223 // A raw value for property nodes that references a class member via
 224 // an osg::ref_ptr.
 225 template<class C, class T>
 226 class RefMember : public SGRawValue<T>
 227 {
 228 public:
 229     RefMember (C *obj, T C::*ptr)
 230         : _obj(obj), _ptr(ptr) {}
 231     virtual ~RefMember () {}
 232     virtual T getValue () const
 233     {
 234         return _obj.get()->*_ptr;
 235     }
 236     virtual bool setValue (T value)
 237     {
 238         _obj.get()->*_ptr = value;
 239         return true;
 240     }
 241     virtual SGRawValue<T> * clone () const
 242     {
 243         return new RefMember(_obj.get(), _ptr);
 244     }
 245 private:
 246     ref_ptr<C> _obj;
 247     T C::* const _ptr;
 248 };
 249
 250 template<typename C, typename T>
 251 RefMember<C, T> makeRefMember(C *obj, T C::*ptr)
 252 {
 253     return RefMember<C, T>(obj, ptr);
 254 }
 255
 256 template<typename C, typename T>
 257 void bindMemberToNode(SGPropertyNode* parent, const char* childName,
 258                       C* obj, T C::*ptr, T value)
 259 {
 260     SGPropertyNode* valNode = parent->getNode(childName);
 261     RefMember<C, T> refMember = makeRefMember(obj, ptr);
 262     if (!valNode) {
 263         valNode = parent->getNode(childName, true);
 264         valNode->tie(refMember, false);
 265         setValue(valNode, value);
 266     } else {
 267         valNode->tie(refMember, true);
 268     }
 269 }
 270
 271 void buildViewport(flightgear::CameraInfo* info, SGPropertyNode* viewportNode,
 272                    const osg::GraphicsContext::Traits *traits)
 273 {
 274     using namespace flightgear;
 275     bindMemberToNode(viewportNode, "x", info, &CameraInfo::x, 0.0);
 276     bindMemberToNode(viewportNode, "y", info, &CameraInfo::y, 0.0);
 277     bindMemberToNode(viewportNode, "width", info, &CameraInfo::width,
 278                      static_cast<double>(traits->width));
 279     bindMemberToNode(viewportNode, "height", info, &CameraInfo::height,
 280                      static_cast<double>(traits->height));
 281 }
 282 }
 283
 284 namespace flightgear
 285 {
 286
 287 CameraInfo* CameraGroup::buildCamera(SGPropertyNode* cameraNode)
 288 {
 289     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 290     const SGPropertyNode* windowNode = cameraNode->getNode("window");
 291     GraphicsWindow* window = 0;
 292     static int cameraNum = 0;
 293     int cameraFlags = DO_INTERSECTION_TEST;
 294     if (windowNode) {
 295         // New style window declaration / definition
 296         window = wBuild->buildWindow(windowNode);
 297     } else {
 298         // Old style: suck window params out of camera block
 299         window = wBuild->buildWindow(cameraNode);
 300     }
 301     if (!window) {
 302         return 0;
 303     }
 304     Camera* camera = new Camera;
 305     camera->setAllowEventFocus(false);
 306     camera->setGraphicsContext(window->gc.get());
 307     camera->setViewport(new Viewport);
 308     camera->setCullingMode(CullSettings::SMALL_FEATURE_CULLING
 309                            | CullSettings::VIEW_FRUSTUM_CULLING);
 310     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 311                                & ~(CullSettings::CULL_MASK
 312                                    | CullSettings::CULLING_MODE));
 313
 314     osg::Matrix pOff;
 315     osg::Matrix vOff;
 316     const SGPropertyNode* viewNode = cameraNode->getNode("view");
 317     if (viewNode) {
 318         double heading = viewNode->getDoubleValue("heading-deg", 0.0);
 319         double pitch = viewNode->getDoubleValue("pitch-deg", 0.0);
 320         double roll = viewNode->getDoubleValue("roll-deg", 0.0);
 321         double x = viewNode->getDoubleValue("x", 0.0);
 322         double y = viewNode->getDoubleValue("y", 0.0);
 323         double z = viewNode->getDoubleValue("z", 0.0);
 324         // Build a view matrix, which is the inverse of a model
 325         // orientation matrix.
 326         vOff = (Matrix::translate(-x, -y, -z)
 327                 * Matrix::rotate(-DegreesToRadians(heading),
 328                                  Vec3d(0.0, 1.0, 0.0),
 329                                  -DegreesToRadians(pitch),
 330                                  Vec3d(1.0, 0.0, 0.0),
 331                                  -DegreesToRadians(roll),
 332                                  Vec3d(0.0, 0.0, 1.0)));
 333         if (viewNode->getBoolValue("absolute", false))
 334             cameraFlags |= VIEW_ABSOLUTE;
 335     } else {
 336         // Old heading parameter, works in the opposite direction
 337         double heading = cameraNode->getDoubleValue("heading-deg", 0.0);
 338         vOff.makeRotate(DegreesToRadians(heading), osg::Vec3(0, 1, 0));
 339     }
 340     const SGPropertyNode* projectionNode = 0;
 341     if ((projectionNode = cameraNode->getNode("perspective")) != 0) {
 342         double fovy = projectionNode->getDoubleValue("fovy-deg", 55.0);
 343         double aspectRatio = projectionNode->getDoubleValue("aspect-ratio",
 344                                                             1.0);
 345         double zNear = projectionNode->getDoubleValue("near", 0.0);
 346         double zFar = projectionNode->getDoubleValue("far", 0.0);
 347         double offsetX = projectionNode->getDoubleValue("offset-x", 0.0);
 348         double offsetY = projectionNode->getDoubleValue("offset-y", 0.0);
 349         double tan_fovy = tan(DegreesToRadians(fovy*0.5));
 350         double right = tan_fovy * aspectRatio * zNear + offsetX;
 351         double left = -tan_fovy * aspectRatio * zNear + offsetX;
 352         double top = tan_fovy * zNear + offsetY;
 353         double bottom = -tan_fovy * zNear + offsetY;
 354         pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 355         cameraFlags |= PROJECTION_ABSOLUTE;
 356     } else if ((projectionNode = cameraNode->getNode("frustum")) != 0
 357                || (projectionNode = cameraNode->getNode("ortho")) != 0) {
 358         double top = projectionNode->getDoubleValue("top", 0.0);
 359         double bottom = projectionNode->getDoubleValue("bottom", 0.0);
 360         double left = projectionNode->getDoubleValue("left", 0.0);
 361         double right = projectionNode->getDoubleValue("right", 0.0);
 362         double zNear = projectionNode->getDoubleValue("near", 0.0);
 363         double zFar = projectionNode->getDoubleValue("far", 0.0);
 364         if (cameraNode->getNode("frustum")) {
 365             pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 366             cameraFlags |= PROJECTION_ABSOLUTE;
 367         } else {
 368             pOff.makeOrtho(left, right, bottom, top, zNear, zFar);
 369             cameraFlags |= (PROJECTION_ABSOLUTE | ORTHO);
 370         }
 371     } else {
 372         // old style shear parameters
 373         double shearx = cameraNode->getDoubleValue("shear-x", 0);
 374         double sheary = cameraNode->getDoubleValue("shear-y", 0);
 375         pOff.makeTranslate(-shearx, -sheary, 0);
 376     }
 377     CameraInfo* info = addCamera(cameraFlags, camera, pOff, vOff);
 378     // If a viewport isn't set on the camera, then it's hard to dig it
 379     // out of the SceneView objects in the viewer, and the coordinates
 380     // of mouse events are somewhat bizzare.
 381     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 382     buildViewport(info, viewportNode, window->gc->getTraits());
 383     return info;
 384 }
 385
 386 CameraInfo* CameraGroup::buildGUICamera(SGPropertyNode* cameraNode,
 387                                         GraphicsWindow* window)
 388 {
 389     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 390     const SGPropertyNode* windowNode = (cameraNode
 391                                         ? cameraNode->getNode("window")
 392                                         : 0);
 393     static int cameraNum = 0;
 394     if (!window) {
 395         if (windowNode) {
 396             // New style window declaration / definition
 397             window = wBuild->buildWindow(windowNode);
 398
 399         } else {
 400             return 0;
 401         }
 402     }
 403     Camera* camera = new Camera;
 404     camera->setAllowEventFocus(false);
 405     camera->setGraphicsContext(window->gc.get());
 406     camera->setViewport(new Viewport);
 407     // XXX Camera needs to be drawn last; eventually the render order
 408     // should be assigned by a camera manager.
 409     camera->setRenderOrder(osg::Camera::POST_RENDER, 100);
 410         camera->setClearMask(0);
 411     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 412                                & ~(CullSettings::COMPUTE_NEAR_FAR_MODE
 413                                    | CullSettings::CULLING_MODE));
 414     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 415     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 416     camera->setProjectionResizePolicy(Camera::FIXED);
 417     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
 418     const int cameraFlags = GUI;
 419     CameraInfo* result = addCamera(cameraFlags, camera, Matrixd::identity(),
 420                                    Matrixd::identity(), false);
 421     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 422     buildViewport(result, viewportNode, window->gc->getTraits());
 423
 424     // Disable statistics for the GUI camera.
 425     result->camera->setStats(0);
 426     updateCameras(result);
 427     return result;
 428 }
 429
 430 CameraGroup* CameraGroup::buildCameraGroup(osgViewer::Viewer* viewer,
 431                                            SGPropertyNode* gnode)
 432 {
 433     CameraGroup* cgroup = new CameraGroup(viewer);
 434     for (int i = 0; i < gnode->nChildren(); ++i) {
 435         SGPropertyNode* pNode = gnode->getChild(i);
 436         const char* name = pNode->getName();
 437         if (!strcmp(name, "camera")) {
 438             cgroup->buildCamera(pNode);
 439         } else if (!strcmp(name, "window")) {
 440             WindowBuilder::getWindowBuilder()->buildWindow(pNode);
 441         } else if (!strcmp(name, "gui")) {
 442             cgroup->buildGUICamera(pNode);
 443         }
 444     }
 445     return cgroup;
 446 }
 447
 448 void CameraGroup::setCameraCullMasks(Node::NodeMask nm)
 449 {
 450     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
 451         if ((*i)->flags & GUI)
 452             continue;
 453         (*i)->camera->setCullMask(nm & ~simgear::BACKGROUND_BIT);
 454         (*i)->farCamera->setCullMask(nm);
 455     }
 456 }
 457
 458 void CameraGroup::resized()
 459 {
 460     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
 461         CameraInfo *info = i->get();
 462         const Viewport* viewport = info->camera->getViewport();
 463         info->x = viewport->x();
 464         info->y = viewport->y();
 465         info->width = viewport->width();
 466         info->height = viewport->height();
 467     }
 468 }
 469
 470 Camera* getGUICamera(CameraGroup* cgroup)
 471 {
 472     CameraGroup::CameraIterator end = cgroup->camerasEnd();
 473     CameraGroup::CameraIterator result
 474         = std::find_if(cgroup->camerasBegin(), end,
 475                        FlagTester<CameraInfo>(CameraGroup::GUI));
 476     if (result != end)
 477         return (*result)->camera.get();
 478     else
 479         return 0;
 480 }
 481
 482 bool computeIntersections(const CameraGroup* cgroup,
 483                           const osgGA::GUIEventAdapter* ea,
 484                           osgUtil::LineSegmentIntersector::Intersections& intersections)
 485 {
 486     using osgUtil::Intersector;
 487     using osgUtil::LineSegmentIntersector;
 488     double x, y;
 489     eventToWindowCoords(ea, x, y);
 490     // Find camera that contains event
 491     for (CameraGroup::ConstCameraIterator iter = cgroup->camerasBegin(),
 492              e = cgroup->camerasEnd();
 493          iter != e;
 494          ++iter) {
 495         const CameraInfo* cinfo = iter->get();
 496         if ((cinfo->flags & CameraGroup::DO_INTERSECTION_TEST) == 0)
 497             continue;
 498         const Camera* camera = cinfo->camera.get();
 499         if (camera->getGraphicsContext() != ea->getGraphicsContext())
 500             continue;
 501         const Viewport* viewport = camera->getViewport();
 502         double epsilon = 0.5;
 503         if (!(x >= viewport->x() - epsilon
 504               && x < viewport->x() + viewport->width() -1.0 + epsilon
 505               && y >= viewport->y() - epsilon
 506               && y < viewport->y() + viewport->height() -1.0 + epsilon))
 507             continue;
 508         LineSegmentIntersector::CoordinateFrame cf = Intersector::WINDOW;
 509         ref_ptr<LineSegmentIntersector> picker
 510             = new LineSegmentIntersector(cf, x, y);
 511         osgUtil::IntersectionVisitor iv(picker.get());
 512         const_cast<Camera*>(camera)->accept(iv);
 513         if (picker->containsIntersections()) {
 514             intersections = picker->getIntersections();
 515             return true;
 516         } else {
 517             break;
 518         }
 519     }
 520     intersections.clear();
 521     return false;
 522 }
 523
 524 void warpGUIPointer(CameraGroup* cgroup, int x, int y)
 525 {
 526     using osgViewer::GraphicsWindow;
 527     Camera* guiCamera = getGUICamera(cgroup);
 528     if (!guiCamera)
 529         return;
 530     Viewport* vport = guiCamera->getViewport();
 531     GraphicsWindow* gw
 532         = dynamic_cast<GraphicsWindow*>(guiCamera->getGraphicsContext());
 533     if (!gw)
 534         return;
 535     globals->get_renderer()->getEventHandler()->setMouseWarped();
 536     // Translate the warp request into the viewport of the GUI camera,
 537     // send the request to the window, then transform the coordinates
 538     // for the Viewer's event queue.
 539     double wx = x + vport->x();
 540     double wyUp = vport->height() + vport->y() - y;
 541     double wy;
 542     const GraphicsContext::Traits* traits = gw->getTraits();
 543     if (gw->getEventQueue()->getCurrentEventState()->getMouseYOrientation()
 544         == osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS) {
 545         wy = traits->height - wyUp;
 546     } else {
 547         wy = wyUp;
 548     }
 549     gw->getEventQueue()->mouseWarped(wx, wy);
 550     gw->requestWarpPointer(wx, wy);
 551     osgGA::GUIEventAdapter* eventState
 552         = cgroup->getViewer()->getEventQueue()->getCurrentEventState();
 553     double viewerX
 554         = (eventState->getXmin()
 555            + ((wx / double(traits->width))
 556               * (eventState->getXmax() - eventState->getXmin())));
 557     double viewerY
 558         = (eventState->getYmin()
 559            + ((wyUp / double(traits->height))
 560               * (eventState->getYmax() - eventState->getYmin())));
 561     cgroup->getViewer()->getEventQueue()->mouseWarped(viewerX, viewerY);
 562 }
 563 }