Implement bounding boxes with a separate class

[libs/math.git] / source / geometry / transformedshape.h

diff --git a/source/geometry/transformedshape.h b/source/geometry/transformedshape.h
index 02587bfd87877efac86f365d39e1a68e072a7020..58e571a9db389a058cdb8ab3de1343b4ee87cb3e 100644 (file)
--- 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>