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
  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 bool check_intersection(const Ray<T, D> &) const;
  30 };
  31
  32 template<typename T, unsigned D>
  33 inline TransformedShape<T, D>::TransformedShape(const Shape<T, D> &s, const AffineTransformation<T, D> &t):
  34         shape(s.clone()),
  35         transformation(t)
  36 { }
  37
  38 template<typename T, unsigned D>
  39 inline TransformedShape<T, D>::TransformedShape(const TransformedShape &other):
  40         shape(other.shape->clone()),
  41         transformation(other.transformation)
  42 { }
  43
  44 template<typename T, unsigned D>
  45 inline TransformedShape<T, D> &TransformedShape<T, D>::operator=(const TransformedShape<T, D> &other)
  46 {
  47         delete shape;
  48         shape = other.shape->clone();
  49         transformation = other.transformation();
  50 }
  51
  52 template<typename T, unsigned D>
  53 inline TransformedShape<T, D>::~TransformedShape()
  54 {
  55         delete shape;
  56 }
  57
  58 template<typename T, unsigned D>
  59 inline TransformedShape<T, D> *TransformedShape<T, D>::clone() const
  60 {
  61         return new TransformedShape<T, D>(*this);
  62 }
  63
  64 template<typename T, unsigned D>
  65 inline bool TransformedShape<T, D>::check_intersection(const Ray<T, D> &ray) const
  66 {
  67         // TODO cache the inverse transformation for performance
  68         LinAl::SquareMatrix<T, D+1> inverse_trans = LinAl::invert(transformation.get_matrix());
  69         Ray<T, D> trans_ray(reduce_vector(inverse_trans*augment_vector(ray.get_start(), T(1))),
  70                 reduce_vector(inverse_trans*augment_vector(ray.get_direction(), T(0))));
  71         return shape->check_intersection(trans_ray);
  72 }
  73
  74 } // namespace Geometry
  75 } // namespace Msp
  76
  77 #endif