1 files changed, 132 insertions, 0 deletions
diff --git a/source/blender/freestyle/intern/view_map/OccluderSource.cpp b/source/blender/freestyle/intern/view_map/OccluderSource.cpp
new file mode 100644
index 00000000000..356e281be4b
--- /dev/null
+++ b/source/blender/freestyle/intern/view_map/OccluderSource.cpp
@@ -0,0 +1,132 @@
+//
+//  Filename         : OccluderSource.h
+//  Author(s)        : Alexander Beels
+//  Purpose          : Class to define a cell grid surrounding
+//                     the projected image of a scene
+//  Date of creation : 2010-12-21
+//
+///////////////////////////////////////////////////////////////////////////////
+
+
+//
+//  Copyright (C) : Please refer to the COPYRIGHT file distributed 
+//   with this source distribution. 
+//
+//  This program is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU General Public License
+//  as published by the Free Software Foundation; either version 2
+//  of the License, or (at your option) any later version.
+//
+//  This program 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
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "OccluderSource.h"
+#include <algorithm>
+
+OccluderSource::OccluderSource (const GridHelpers::Transform& t, WingedEdge& we) : wingedEdge(we), valid(false), transform(t) {
+	begin();
+}
+
+OccluderSource::~OccluderSource() {
+}
+
+void OccluderSource::buildCachedPolygon() {
+	vector<Vec3r> vertices(GridHelpers::enumerateVertices((*currentFace)->getEdgeList()));
+	// This doesn't work, because our functor's polymorphism won't survive the copy:
+	// std::transform(vertices.begin(), vertices.end(), vertices.begin(), transform);
+	// so we have to do:
+	for ( vector<Vec3r>::iterator i = vertices.begin(); i != vertices.end(); ++i ) {
+		(*i) = transform(*i);
+	}
+	cachedPolygon = Polygon3r(vertices, transform((*currentFace)->GetNormal()));
+}
+
+void OccluderSource::begin() {
+ 	vector<WShape*>& wshapes = wingedEdge.getWShapes();
+	currentShape = wshapes.begin();
+	shapesEnd = wshapes.end();
+	valid = false;
+	if ( currentShape != shapesEnd ) {
+		vector<WFace*>& wFaces = (*currentShape)->GetFaceList();
+		currentFace = wFaces.begin();
+		facesEnd = wFaces.end();
+
+		if ( currentFace != facesEnd ) {
+			buildCachedPolygon();
+			valid = true;
+		}
+	}
+}
+
+bool OccluderSource::next() {
+	if ( valid ) {
+		++currentFace;
+		while ( currentFace == facesEnd ) {
+			++currentShape;
+			if ( currentShape == shapesEnd ) {
+				valid = false;
+				return false;
+			} else {
+				vector<WFace*>& wFaces = (*currentShape)->GetFaceList();
+				currentFace = wFaces.begin();
+				facesEnd = wFaces.end();
+			}
+		}
+		buildCachedPolygon();
+		return true;
+	}
+	return false;
+}
+
+bool OccluderSource::isValid() {
+	// Or:
+	// return currentShapes != shapesEnd && currentFace != facesEnd;
+	return valid;
+}
+
+WFace* OccluderSource::getWFace() {
+	return valid ? *currentFace : NULL;
+}
+
+Polygon3r OccluderSource::getCameraSpacePolygon() {
+	return Polygon3r(GridHelpers::enumerateVertices((*currentFace)->getEdgeList()), (*currentFace)->GetNormal());
+}
+
+Polygon3r& OccluderSource::getGridSpacePolygon() {
+	return cachedPolygon;
+}
+
+void OccluderSource::getOccluderProscenium(real proscenium[4]) {
+	begin();
+	const Vec3r& initialPoint = cachedPolygon.getVertices()[0];
+	proscenium[0] = proscenium[1] = initialPoint[0];
+	proscenium[2] = proscenium[3] = initialPoint[1];
+	while ( isValid() ) {
+		GridHelpers::expandProscenium (proscenium, cachedPolygon);
+		next();
+	}
+	cout << "Proscenium: (" << proscenium[0] << ", " << proscenium[1] << ", " << proscenium[2] << ", " << proscenium[3] << ")" << endl;
+}
+
+real OccluderSource::averageOccluderArea() {
+	real area = 0.0;
+	unsigned numFaces = 0;
+	for ( begin(); isValid(); next() ) {
+		Vec3r min, max;
+		cachedPolygon.getBBox(min, max);
+		area += (max[0] - min[0]) * (max[1] - min[1]);
+		++numFaces;
+	}
+	area /= numFaces;
+	return area;
+}
+
+