X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;ds=sidebyside;f=source%2Fgeometry%2Ftransformedshape.h;h=58e571a9db389a058cdb8ab3de1343b4ee87cb3e;hb=09cc3a8648dd20e9a07d669b353c4a120b67c1c4;hp=02587bfd87877efac86f365d39e1a68e072a7020;hpb=f7dcf3f0be55316bf20ac0c318dd90cb78a75c80;p=libs%2Fmath.git

diff --git a/source/geometry/transformedshape.h b/source/geometry/transformedshape.h
index 02587bf..58e571a 100644
--- a/source/geometry/transformedshape.h
+++ b/source/geometry/transformedshape.h
@@ -2,6 +2,7 @@
 #define MSP_GEOMETRY_TRANSFORMEDSHAPE_H_
 
 #include "affinetransformation.h"
+#include "boundingbox.h"
 #include "ray.h"
 #include "shape.h"
 
@@ -30,7 +31,7 @@ public:
 	const Shape<T, D> &get_shape() const { return *shape; }
 	const AffineTransformation<T, D> &get_transformation() const { return transformation; }
 
-	virtual HyperBox<T, D> get_axis_aligned_bounding_box() const;
+	virtual BoundingBox<T, D> get_axis_aligned_bounding_box() const;
 	virtual bool contains(const LinAl::Vector<T, D> &) const;
 private:
 	Ray<T, D> make_local_ray(const Ray<T, D> &) const;
@@ -75,10 +76,28 @@ inline TransformedShape<T, D> *TransformedShape<T, D>::clone() const
 }
 
 template<typename T, unsigned D>
-inline HyperBox<T, D> TransformedShape<T, D>::get_axis_aligned_bounding_box() const
+inline BoundingBox<T, D> TransformedShape<T, D>::get_axis_aligned_bounding_box() const
 {
-	// XXX This is not correct for most shapes
-	return shape->get_axis_aligned_bounding_box();
+	BoundingBox<T, D> inner_bbox = shape->get_axis_aligned_bounding_box();
+
+	LinAl::Vector<T, D> min_pt;
+	LinAl::Vector<T, D> max_pt;
+	for(unsigned i=0; i<(1<<D); ++i)
+	{
+		LinAl::Vector<T, D> point;
+		for(unsigned j=0; j<D; ++j)
+			point[j] = ((i>>j)&1 ? inner_bbox.get_maximum_coordinate(j) : inner_bbox.get_minimum_coordinate(j));
+
+		point = transformation.transform(point);
+
+		for(unsigned j=0; j<D; ++j)
+		{
+			min_pt[j] = std::min(min_pt[j], point[j]);
+			max_pt[j] = std::max(min_pt[j], point[j]);
+		}
+	}
+
+	return BoundingBox<T, D>(min_pt, max_pt);
 }
 
 template<typename T, unsigned D>