osgEarth 2.1.1

/home/cube/sources/osgearth/src/osgEarthFeatures/ScaleFilter.cpp

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00001 /* -*-c++-*- */
00002 /* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
00003  * Copyright 2008-2010 Pelican Mapping
00004  * http://osgearth.org
00005  *
00006  * osgEarth is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU Lesser General Public License as published by
00008  * the Free Software Foundation; either version 2 of the License, or
00009  * (at your option) any later version.
00010  *
00011  * This program is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  * GNU Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public License
00017  * along with this program.  If not, see <http://www.gnu.org/licenses/>
00018  */
00019 #include <osgEarthFeatures/ScaleFilter>
00020 #include <osgEarth/GeoData>
00021 
00022 using namespace osgEarth;
00023 using namespace osgEarth::Features;
00024 using namespace osgEarth::Symbology;
00025 
00026 ScaleFilter::ScaleFilter() :
00027 _scale( 0.0 )
00028 {
00029     //NOP
00030 }
00031 
00032 ScaleFilter::ScaleFilter( double scale ) :
00033 _scale( scale )
00034 {
00035     //NOP
00036 }
00037 
00038 FilterContext
00039 ScaleFilter::push( FeatureList& input, FilterContext& cx )
00040 {
00041     for( FeatureList::iterator i = input.begin(); i != input.end(); ++i )
00042     {
00043         Feature* input = i->get();
00044         if ( input && input->getGeometry() )
00045         {
00046             Bounds envelope = input->getGeometry()->getBounds();
00047 
00048             // now scale and shift everything
00049             GeometryIterator scale_iter( input->getGeometry() );
00050             while( scale_iter.hasMore() )
00051             {
00052                 Geometry* geom = scale_iter.next();
00053                 for( osg::Vec3dArray::iterator v = geom->begin(); v != geom->end(); v++ )
00054                 {
00055                     double xr = (v->x() - envelope.xMin()) / envelope.width();
00056                     v->x() += (xr - 0.5) * _scale;
00057 
00058                     double yr = (v->y() - envelope.yMin()) / envelope.height();
00059                     v->y() += (yr - 0.5) * _scale;
00060                 }
00061             }
00062         }
00063     }
00064 
00065     return cx;
00066 }
00067 
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