source/geometry/transformedshape.h

   1 #ifndef MSP_GEOMETRY_TRANSFORMEDSHAPE_H_
   2 #define MSP_GEOMETRY_TRANSFORMEDSHAPE_H_
   3
   4 #include "affinetransformation.h"
   5 #include "ray.h"
   6 #include "shape.h"
   7
   8 namespace Msp {
   9 namespace Geometry {
  10
  11 template<typename T, unsigned D>
  12 class TransformedShape: public Shape<T, D>
  13 {
  14 private:
  15         Shape<T, D> *shape;
  16         AffineTransformation<T, D> transformation;
  17
  18 public:
  19         TransformedShape(const Shape<T, D> &, const AffineTransformation<T, D> &);
  20         TransformedShape(const TransformedShape &);
  21         TransformedShape &operator=(const TransformedShape &);
  22         ~TransformedShape();
  23
  24         virtual TransformedShape *clone() const;
  25
  26         const Shape<T, D> &get_shape() const { return *shape; }
  27         const AffineTransformation<T, D> &get_transformation() const { return transformation; }
  28
  29         virtual HyperBox<T, D> get_axis_aligned_bounding_box() const;
  30         virtual bool check_intersection(const Ray<T, D> &) const;
  31 };
  32
  33 template<typename T, unsigned D>
  34 inline TransformedShape<T, D>::TransformedShape(const Shape<T, D> &s, const AffineTransformation<T, D> &t):
  35         shape(s.clone()),
  36         transformation(t)
  37 { }
  38
  39 template<typename T, unsigned D>
  40 inline TransformedShape<T, D>::TransformedShape(const TransformedShape &other):
  41         shape(other.shape->clone()),
  42         transformation(other.transformation)
  43 { }
  44
  45 template<typename T, unsigned D>
  46 inline TransformedShape<T, D> &TransformedShape<T, D>::operator=(const TransformedShape<T, D> &other)
  47 {
  48         delete shape;
  49         shape = other.shape->clone();
  50         transformation = other.transformation();
  51 }
  52
  53 template<typename T, unsigned D>
  54 inline TransformedShape<T, D>::~TransformedShape()
  55 {
  56         delete shape;
  57 }
  58
  59 template<typename T, unsigned D>
  60 inline TransformedShape<T, D> *TransformedShape<T, D>::clone() const
  61 {
  62         return new TransformedShape<T, D>(*this);
  63 }
  64
  65 template<typename T, unsigned D>
  66 inline HyperBox<T, D> TransformedShape<T, D>::get_axis_aligned_bounding_box() const
  67 {
  68         // XXX This is not correct for most shapes
  69         return shape->get_axis_aligned_bounding_box();
  70 }
  71
  72 template<typename T, unsigned D>
  73 inline bool TransformedShape<T, D>::check_intersection(const Ray<T, D> &ray) const
  74 {
  75         // TODO cache the inverse transformation for performance
  76         LinAl::SquareMatrix<T, D+1> inverse_trans = LinAl::invert(transformation.get_matrix());
  77         Ray<T, D> trans_ray(reduce_vector(inverse_trans*augment_vector(ray.get_start(), T(1))),
  78                 reduce_vector(inverse_trans*augment_vector(ray.get_direction(), T(0))));
  79         return shape->check_intersection(trans_ray);
  80 }
  81
  82 } // namespace Geometry
  83 } // namespace Msp
  84
  85 #endif