www.pudn.com > BucklandSimpleSoccer.rar > Goal.h

#ifndef GOAL_H 
#define GOAL_H 
//------------------------------------------------------------------------ 
// 
//Name:   Goal.h 
// 
//Desc:   class to define a goal for a soccer pitch. The goal is defined 
//        by two 2D vectors representing the left and right posts. 
// 
//        Each time-step the method Scored should be called to determine 
//        if a goal has been scored. 
// 
//Author: Mat Buckland 2003 (fup@ai-junkie.com) 
// 
//------------------------------------------------------------------------ 
#include "SoccerBall.h" 
#include "2D/Vector2D.h" 
#include "2D/geometry.h" 
 
 
 
class Goal  
{ 
 
private: 
 
  Vector2D   m_vLeftPost; 
  Vector2D   m_vRightPost; 
 
  //a vector representing the facing direction of the goal 
  Vector2D   m_vFacing; 
 
  //the position of the center of the goal line 
  Vector2D   m_vCenter; 
 
  //each time Scored() detects a goal this is incremented 
  int        m_iNumGoalsScored; 
 
public: 
 
  Goal(Vector2D left, Vector2D right, Vector2D facing):m_vLeftPost(left), 
                                                       m_vRightPost(right), 
                                                       m_vCenter((left+right)/2.0), 
                                                       m_iNumGoalsScored(0), 
                                                       m_vFacing(facing) 
  {  } 
 
  //Given the current ball position and the previous ball position, 
  //this method returns true if the ball has crossed the goal line  
  //and increments m_iNumGoalsScored 
  inline bool Scored(const SoccerBall*const ball); 
 
  //-----------------------------------------------------accessor methods 
  Vector2D Center()const{return m_vCenter;} 
  Vector2D Facing()const{return m_vFacing;} 
  Vector2D LeftPost()const{return m_vLeftPost;} 
  Vector2D RightPost()const{return m_vRightPost;} 
 
  int      NumGoalsScored()const{return m_iNumGoalsScored;} 
  void     ResetGoalsScored(){m_iNumGoalsScored = 0;} 
}; 
 
 
///////////////////////////////////////////////////////////////////////// 
 
bool Goal::Scored(const SoccerBall*const ball) 
{ 
  if (LineIntersection2D(ball->Pos(), ball->OldPos(), m_vLeftPost, m_vRightPost)) 
  { 
    ++m_iNumGoalsScored; 
 
    return true; 
  } 
 
  return false; 
} 
 
 
#endif