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         AffineTransformation<T, D> inverse_trans;
  18
  19 public:
  20         TransformedShape(const Shape<T, D> &, const AffineTransformation<T, D> &);
  21         TransformedShape(const TransformedShape &);
  22         TransformedShape &operator=(const TransformedShape &);
  23         ~TransformedShape();
  24
  25         virtual TransformedShape *clone() const;
  26
  27         const Shape<T, D> &get_shape() const { return *shape; }
  28         const AffineTransformation<T, D> &get_transformation() const { return transformation; }
  29
  30         virtual HyperBox<T, D> get_axis_aligned_bounding_box() const;
  31         virtual bool check_intersection(const Ray<T, D> &) const;
  32 };
  33
  34 template<typename T, unsigned D>
  35 inline TransformedShape<T, D>::TransformedShape(const Shape<T, D> &s, const AffineTransformation<T, D> &t):
  36         shape(s.clone()),
  37         transformation(t),
  38         inverse_trans(invert(t))
  39 { }
  40
  41 template<typename T, unsigned D>
  42 inline TransformedShape<T, D>::TransformedShape(const TransformedShape &other):
  43         shape(other.shape->clone()),
  44         transformation(other.transformation),
  45         inverse_trans(other.inverse_trans)
  46 { }
  47
  48 template<typename T, unsigned D>
  49 inline TransformedShape<T, D> &TransformedShape<T, D>::operator=(const TransformedShape<T, D> &other)
  50 {
  51         delete shape;
  52         shape = other.shape->clone();
  53         transformation = other.transformation;
  54         inverse_trans = other.inverse_trans;
  55 }
  56
  57 template<typename T, unsigned D>
  58 inline TransformedShape<T, D>::~TransformedShape()
  59 {
  60         delete shape;
  61 }
  62
  63 template<typename T, unsigned D>
  64 inline TransformedShape<T, D> *TransformedShape<T, D>::clone() const
  65 {
  66         return new TransformedShape<T, D>(*this);
  67 }
  68
  69 template<typename T, unsigned D>
  70 inline HyperBox<T, D> TransformedShape<T, D>::get_axis_aligned_bounding_box() const
  71 {
  72         // XXX This is not correct for most shapes
  73         return shape->get_axis_aligned_bounding_box();
  74 }
  75
  76 template<typename T, unsigned D>
  77 inline bool TransformedShape<T, D>::check_intersection(const Ray<T, D> &ray) const
  78 {
  79         Ray<T, D> local_ray(inverse_trans.transform(ray.get_start()),
  80                 inverse_trans.transform_linear(ray.get_direction()));
  81         return shape->check_intersection(local_ray);
  82 }
  83
  84 } // namespace Geometry
  85 } // namespace Msp
  86
  87 #endif