#ifndef COLLISIONS_H#define COLLISIONS_H#include <GL/glut.h>#include "polygon.h"#include "vector3d.h"const double PI = 3.1415926535897932;const enum SPHERE_POSITION{	BEHIND,	INTERSECTS,	IN_FRONT};/*****************Plane-line collision functions*******************///distance of a plane from origin, normal & point are on planefloat planeDistance( const Vector3d& normal, const Vector3d& point );//tests the intersection between a triangle on the plane and a linebool intersectPlane( const Vector3d* poly, const Vector3d* line, Vector3d normal, float& originDistance );//overloaded to take a polygon objectbool intersectPlane( MyPolygon poly, const Vector3d* line, Vector3d normal, float& originDistance );/****************Polygon-Line collision functions******************///returns angle in radians, vectors must be normaliseddouble angleBetweenVectors( const Vector3d& normalisedVector1, const Vector3d& normalisedVector2 );//returns the point of intersection, assuming there is one!Vector3d intersectionPoint( Vector3d normal, const Vector3d* line, const float& distance );//returns true/false if the intersection point is inside the polygonbool insidePolygon( const Vector3d& intersection, const Vector3d* poly, const long vertexCount );//THE ray/polygon test functionbool intersectPolygon( const Vector3d* poly, const Vector3d* line, const int vertexCount );//overloaded ray/polygon test functionbool intersectPolygon( MyPolygon poly, const Vector3d* line );/****************Sphere-Polygon collision functions****************///returns the absolute value, ie without a signfloat absolute( float number );//uses pythagoras to get the distance between 2 3d points - SAME AS LENGTH CALCULATIONfloat distanceBetweenPoints( Vector3d point1, Vector3d point2 );//returns the point on line closest to point argumentVector3d closestPointOnLine( Vector3d& lineStart, Vector3d& lineEnd, Vector3d& point );//classifies a sphere according to its postion relative to the planeSPHERE_POSITION classifySphere( Vector3d& centre, Vector3d& planeNormal, Vector3d& pointOnPlane, float radius, float &distance );//hits the edge only, not an inside/outside testbool edgeSphereCollision( Vector3d& centre, Vector3d* poly, int vertexCount, float radius );//THE function to test for sphere/polygon collisionsbool spherePolygonCollision( Vector3d* poly, int vertexCount, Vector3d& centre, float radius );//overloaded for MyPolygon objectbool spherePolygonCollision( MyPolygon poly, Vector3d& centre, float radius );#endif		//COLLISIONS_H    

  void Breakout::run( ){	fRate.setSpeedFactor( );		//use fRate.speedfactor to modify all movement//	cout << "FPS : " << fRate.fps << endl;		if( ball.isActive( ) )	{		ball.move( fRate.speedFactor );		testCollisions( );	}}//code to move the ballvoid Ball::move( GLfloat timeBasedModifier ){	location += speed * direction * timeBasedModifier;}