source: src/Shapes/Shape.cpp@ 2ad482

/*
 * Shape.cpp
 *
 *  Created on: Jun 18, 2010
 *      Author: crueger
 */

#include "Shape.hpp"
#include "Shape_impl.hpp"

#include "Helpers/Assert.hpp"

#include <string>

using namespace std;

Shape::Shape(const Shape& src) :
  impl(src.getImpl())
{}

Shape::~Shape(){}

bool Shape::isInside(const Vector &point) const{
  return impl->isInside(point);
}

bool Shape::isOnSurface(const Vector &point) const{
  return impl->isOnSurface(point);
}

Vector Shape::getNormal(const Vector &point) const throw (NotOnSurfaceException){
  return impl->getNormal(point);
}

LineSegmentSet Shape::getLineIntersections(const Line &line){
  return impl->getLineIntersections(line);
}

Shape::Shape(Shape::impl_ptr _impl) :
    impl(_impl)
{}

Shape &Shape::operator=(const Shape& rhs){
  if(&rhs!=this){
    impl=rhs.getImpl();
  }
  return *this;
}

std::string Shape::toString() const{
  return impl->toString();
}

Shape::impl_ptr Shape::getImpl() const{
  return impl;
}

// allows arbitrary friendship, but only if implementation is known
Shape::impl_ptr getShapeImpl(const Shape &shape){
  return shape.getImpl();
}

/***************************** Some simple Shapes ***************************/

Shape Everywhere(){
  static Shape::impl_ptr impl = Shape::impl_ptr(new Everywhere_impl());
  return Shape(impl);
}

Shape Nowhere(){
  static Shape::impl_ptr impl = Shape::impl_ptr(new Nowhere_impl());
  return Shape(impl);
}

/****************************** Operators ***********************************/

// AND

AndShape_impl::AndShape_impl(const Shape::impl_ptr &_lhs, const Shape::impl_ptr &_rhs) :
  lhs(_lhs),rhs(_rhs)
{}

AndShape_impl::~AndShape_impl(){}

bool AndShape_impl::isInside(const Vector &point){
  return lhs->isInside(point) && rhs->isInside(point);
}

bool AndShape_impl::isOnSurface(const Vector &point){
  // check the number of surfaces that this point is on
  int surfaces =0;
  surfaces += lhs->isOnSurface(point);
  surfaces += rhs->isOnSurface(point);

  switch(surfaces){
    case 0:
      return false;
      // no break necessary
    case 1:
      // if it is inside for the object where it does not lie on
      // the surface the whole point lies inside
      return (lhs->isOnSurface(point) && rhs->isInside(point)) ||
             (rhs->isOnSurface(point) && lhs->isInside(point));
      // no break necessary
    case 2:
      {
        // it lies on both Shapes... could be an edge or an inner point
        // test the direction of the normals
        Vector direction=lhs->getNormal(point)+rhs->getNormal(point);
        // if the directions are opposite we lie on the inside
        return !direction.IsZero();
      }
      // no break necessary
    default:
      // if this happens there is something wrong
      ASSERT(0,"Default case should have never been used");
  }
  return false; // never reached
}

Vector AndShape_impl::getNormal(const Vector &point) throw (NotOnSurfaceException){
  Vector res;
  if(!isOnSurface(point)){
    throw NotOnSurfaceException(__FILE__,__LINE__);
  }
  res += lhs->isOnSurface(point)?lhs->getNormal(point):zeroVec;
  res += rhs->isOnSurface(point)?rhs->getNormal(point):zeroVec;
  res.Normalize();
  return res;
}

LineSegmentSet AndShape_impl::getLineIntersections(const Line &line){
  return intersect(lhs->getLineIntersections(line),rhs->getLineIntersections(line));
}

string AndShape_impl::toString(){
  return string("(") + lhs->toString() + string("&&") + rhs->toString() + string(")");
}

Shape operator&&(const Shape &lhs,const Shape &rhs){
  Shape::impl_ptr newImpl = Shape::impl_ptr(new AndShape_impl(getShapeImpl(lhs),getShapeImpl(rhs)));
  return Shape(newImpl);
}

// OR

OrShape_impl::OrShape_impl(const Shape::impl_ptr &_lhs, const Shape::impl_ptr &_rhs) :
  lhs(_lhs),rhs(_rhs)
{}

OrShape_impl::~OrShape_impl(){}

bool OrShape_impl::isInside(const Vector &point){
  return rhs->isInside(point) || lhs->isInside(point);
}

bool OrShape_impl::isOnSurface(const Vector &point){
  // check the number of surfaces that this point is on
  int surfaces =0;
  surfaces += lhs->isOnSurface(point);
  surfaces += rhs->isOnSurface(point);

  switch(surfaces){
    case 0:
      return false;
      // no break necessary
    case 1:
      // if it is inside for the object where it does not lie on
      // the surface the whole point lies inside
      return (lhs->isOnSurface(point) && !rhs->isInside(point)) ||
             (rhs->isOnSurface(point) && !lhs->isInside(point));
      // no break necessary
    case 2:
      {
        // it lies on both Shapes... could be an edge or an inner point
        // test the direction of the normals
        Vector direction=lhs->getNormal(point)+rhs->getNormal(point);
        // if the directions are opposite we lie on the inside
        return !direction.IsZero();
      }
      // no break necessary
    default:
      // if this happens there is something wrong
      ASSERT(0,"Default case should have never been used");
  }
  return false; // never reached
}

Vector OrShape_impl::getNormal(const Vector &point) throw (NotOnSurfaceException){
  Vector res;
  if(!isOnSurface(point)){
    throw NotOnSurfaceException(__FILE__,__LINE__);
  }
  res += lhs->isOnSurface(point)?lhs->getNormal(point):zeroVec;
  res += rhs->isOnSurface(point)?rhs->getNormal(point):zeroVec;
  res.Normalize();
  return res;
}

LineSegmentSet OrShape_impl::getLineIntersections(const Line &line){
  return merge(lhs->getLineIntersections(line),rhs->getLineIntersections(line));
}

string OrShape_impl::toString(){
  return string("(") + lhs->toString() + string("||") + rhs->toString() + string(")");
}

Shape operator||(const Shape &lhs,const Shape &rhs){
  Shape::impl_ptr newImpl = Shape::impl_ptr(new OrShape_impl(getShapeImpl(lhs),getShapeImpl(rhs)));
  return Shape(newImpl);
}

// NOT

NotShape_impl::NotShape_impl(const Shape::impl_ptr &_arg) :
  arg(_arg)
{}

NotShape_impl::~NotShape_impl(){}

bool NotShape_impl::isInside(const Vector &point){
  return !arg->isInside(point);
}

bool NotShape_impl::isOnSurface(const Vector &point){
  return arg->isOnSurface(point);
}

Vector NotShape_impl::getNormal(const Vector &point) throw(NotOnSurfaceException){
  return -1*arg->getNormal(point);
}

LineSegmentSet NotShape_impl::getLineIntersections(const Line &line){
  return invert(arg->getLineIntersections(line));
}

string NotShape_impl::toString(){
  return string("!") + arg->toString();
}

Shape operator!(const Shape &arg){
  Shape::impl_ptr newImpl = Shape::impl_ptr(new NotShape_impl(getShapeImpl(arg)));
  return Shape(newImpl);
}

/**************** global operations *********************************/
ostream &operator<<(ostream &ost,const Shape &shape){
  ost << shape.toString();
  return ost;
}