d2simplex Class Reference

A triangle in 2D. More...

#include <d2simplex.h>

Inheritance diagram for d2simplex:

Collaboration diagram for d2simplex:

List of all members.

Public Member Functions
bool const	intersects (d2simplex const &s2) const
	Do the two simplexes intersect?
bool const	sees (d2simplex const &s2) const
	If one simplex sees the other there is no intersection.
void	rotate (doublec theta)
	Anticlockwise rotation of the simplex about its center.
void	translate (pt2c &x)
	Shift the simplex.
Public Attributes
point2< double >	v [3]
	Ordered in anticlockwise direction.

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Detailed Description

A triangle in 2D.

Definition at line 14 of file d2simplex.h.

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Member Function Documentation

bool const d2simplex::intersects

(

d2simplex const &

s2

)

const

Do the two simplexes intersect?

Reimplemented in d2simplexSeparateAxis.

void d2simplex::rotate

(

doublec

theta

)

Anticlockwise rotation of the simplex about its center.

Definition at line 16 of file d2simplex.cpp.

References d2homogeneous::matrixMultiply(), d2homogeneous::setRotateAboutPoint(), and v.

Referenced by d2simplextestmenu01::readImmediate().

{
  point2<double> c(v[0]);
  c += v[1];
  c += v[2];
  c *= (1.0/3.0);

  d2homogeneous R;

  R.setRotateAboutPoint(theta,c);

  for (uint i=0; i<3; ++i)
    R.matrixMultiply(v[i]);

/*
  double const cos_t = cos(theta);
  double const sin_t = sin(theta);

  pt2c r1(cos_t,-sin_t);
  pt2c r2(sin_t,cos_t);

  pt2 z;
  for (uint i=0; i<3; ++i)
  {
    z.x = r1.dot(v[i]);
    z.y = r2.dot(v[i]);
    v[i] = z;
  }
*/


}

bool const d2simplex::sees

(

d2simplex const &

s2

)

const

If one simplex sees the other there is no intersection.

Reimplemented in d2simplexSeparateAxis.

void d2simplex::translate

(

pt2c &

x

)

Shift the simplex.

Definition at line 9 of file d2simplex.cpp.

References v.

Referenced by d2simplextestmenu01::readImmediate(), and d2simplextest::test01().

{
  for (uint i=0; i<3; ++i)
    v[i] += x; 
}

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Member Data Documentation

point2<double> d2simplex::v[3]

Ordered in anticlockwise direction.

Definition at line 19 of file d2simplex.h.

Referenced by d2simplexNormals::draw(), d2simplexFill::draw(), d2simplexOutline::draw(), rotate(), d2simplexSeparateAxis::sees(), d2simplextest::test01(), and translate().

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The documentation for this class was generated from the following files:

• intersectiontests/d2simplex.h
• intersectiontests/d2simplex.cpp