Introduced osgVolume::Layer and Locator classes mirrroring similar classes in osgTerrain.

2009-01-05 11:26:26 +00:00
parent 788bead9fe
commit cedffd3adb
8 changed files with 549 additions and 3 deletions
--- a/src/osgVolume/Locator.cpp
+++ b/src/osgVolume/Locator.cpp
@@ -0,0 +1,167 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
+*/
+
+#include <osgVolume/Locator>
+
+#include <list>
+
+using namespace osgVolume;
+
+void Locator::setTransformAsExtents(double minX, double minY, double maxX, double maxY, double minZ, double maxZ)
+{
+    _transform.set(maxX-minX, 0.0,       0.0,       0.0,
+                   0.0,       maxY-minY, 0.0,       0.0,
+                   0.0,       0.0,       maxZ-minZ, 0.0,
+                   minX,      minY,      minZ,      1.0); 
+
+    _inverse.invert(_transform);
+}
+
+bool Locator::convertLocalToModel(const osg::Vec3d& local, osg::Vec3d& world) const
+{
+    world = local * _transform;
+    return true;
+}
+
+bool Locator::convertModelToLocal(const osg::Vec3d& world, osg::Vec3d& local) const
+{
+    local = world * _inverse;
+    return true;
+}
+
+bool Locator::computeLocalBounds(Locator& source, osg::Vec3d& bottomLeft, osg::Vec3d& topRight) const
+{
+    typedef std::list<osg::Vec3d> Corners;
+    Corners corners;
+
+    osg::Vec3d cornerNDC;
+    if (convertLocalToModel(osg::Vec3d(0.0,0.0,0.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(1.0,0.0,0.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(0.0,1.0,0.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(1.0,1.0,0.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(0.0,0.0,1.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(1.0,0.0,1.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(0.0,1.0,1.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(1.0,1.0,1.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (corners.empty()) return false;
+
+
+    for(Corners::iterator itr = corners.begin();
+        itr != corners.end();
+        ++itr)
+    {
+        bottomLeft.x() = osg::minimum( bottomLeft.x(), itr->x());
+        bottomLeft.y() = osg::minimum( bottomLeft.y(), itr->y());
+        bottomLeft.z() = osg::minimum( bottomLeft.z(), itr->z());
+        topRight.x() = osg::maximum( topRight.x(), itr->x());
+        topRight.y() = osg::maximum( topRight.y(), itr->y());
+        topRight.z() = osg::maximum( topRight.z(), itr->z());
+    }
+    
+    return true;
+}
+
+bool Locator::computeLocalBounds(osg::Vec3d& bottomLeft, osg::Vec3d& topRight) const
+{
+    typedef std::list<osg::Vec3d> Corners;
+    Corners corners;
+
+    osg::Vec3d cornerNDC;
+    if (convertLocalToModel(osg::Vec3d(0.0,0.0,0.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(1.0,0.0,0.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(0.0,1.0,0.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(1.0,1.0,0.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(0.0,0.0,1.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(1.0,0.0,1.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(0.0,1.0,1.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (convertLocalToModel(osg::Vec3d(1.0,1.0,1.0), cornerNDC))
+    {
+        corners.push_back(cornerNDC);
+    }
+
+    if (corners.empty()) return false;
+
+    for(Corners::iterator itr = corners.begin();
+        itr != corners.end();
+        ++itr)
+    {
+        bottomLeft.x() = osg::minimum( bottomLeft.x(), itr->x());
+        bottomLeft.y() = osg::minimum( bottomLeft.y(), itr->y());
+        bottomLeft.z() = osg::minimum( bottomLeft.z(), itr->z());
+        topRight.x() = osg::maximum( topRight.x(), itr->x());
+        topRight.y() = osg::maximum( topRight.y(), itr->y());
+        topRight.z() = osg::maximum( topRight.z(), itr->z());
+    }
+    
+    return true;
+}