?? snake.cpp
字號:
/*++
Copyright (c) 2004-2005 AFE(Active-Free-Elegance)
Module Name:
snake.cpp
Abstract:
the class of Snake,including the basic-method
such as : move,born,and eat,and so on.
Author:
Weijian Luo (Arthur Luo) 15-Jun-2005
E-mail: skybluehacker@yahoo.com.cn
Revision History: 1.0
--*/
#include "snake.h"
CSnake::CSnake(int x_pos,int y_pos,int len)
{
if(len<1) len=1;
int i;
m_length=len; //蛇的身體體長
//初始化蛇的坐標位置
m_pPos=new SPoint[m_length+2];
m_pPos[0].x=x_pos;m_pPos[0].y=y_pos;
for(i=1;i<m_length+2;i++)
{
m_pPos[i].x=0;m_pPos[i].y=0;
}
//初始化蛇的運動狀態
m_newSnake.head=S_NONE;
m_oldSnake.head=S_NONE;
m_newSnake.body=new MoveState[m_length];
m_oldSnake.body=new MoveState[m_length];
for(i=0;i<m_length;i++)
{
m_newSnake.body[i]=S_NONE;
m_newSnake.body[i]=S_NONE;
}
m_newSnake.tail=S_NONE;
m_oldSnake.tail=S_NONE;
//初始化蛇的位圖顯示狀態
m_pStateArray=new BitmapState[m_length+2];
for(i=0;i<m_length+2;i++)
m_pStateArray[i]=M_NONE;
}
CSnake::~CSnake()
{
SAFE_DELETE_ARRAY(m_pStateArray);
SAFE_DELETE_ARRAY(m_pPos);
}
//
//根據新舊兩個身體的運動趨勢情況，返回當前應當顯示的身體狀態
//
BitmapState CSnake::GetRightState(MoveState oldDirect,MoveState newDirect)
{
BitmapState res;
switch(oldDirect)
{
case S_NONE:
switch(newDirect)
{
case S_NONE:
res=M_NONE;
break;
case S_UP:
res=M_UP_UP;
break;
case S_DOWN:
res=M_DOWN_DOWN;
break;
case S_LEFT:
res=M_LEFT_LEFT;
break;
case S_RIGHT:
res=M_RIGHT_RIGHT;
break;
}
break;
case S_UP:
switch(newDirect)
{
case S_UP:
res=M_UP_UP;
break;
case S_LEFT:
res=M_UP_LEFT;
break;
case S_RIGHT:
res=M_UP_RIGHT;
break;
}
break;
case S_DOWN:
switch(newDirect)
{
case S_DOWN:
res=M_DOWN_DOWN;
break;
case S_LEFT:
res=M_DOWN_LEFT;
break;
case S_RIGHT:
res=M_DOWN_RIGHT;
break;
}
break;
case S_LEFT:
switch(newDirect)
{
case S_LEFT:
res=M_LEFT_LEFT;
break;
case S_UP:
res=M_LEFT_UP;
break;
case S_DOWN:
res=M_LEFT_DOWN;
break;
}
break;
case S_RIGHT:
switch(newDirect)
{
case S_RIGHT:
res=M_RIGHT_RIGHT;
break;
case S_UP:
res=M_RIGHT_UP;
break;
case S_DOWN:
res=M_RIGHT_DOWN;
break;
}
break;
}
return res;
}
//
//改變方向
//
void CSnake::ChangeDirect(MoveState d)
{
// 改變方向的條件：非對立方向
// 只能為其左，前，右方
switch(d)
{
case S_NONE:
m_newSnake.head=d;
break;
case S_UP:
if(m_newSnake.head!=S_DOWN) m_newSnake.head=d;
break;
case S_DOWN:
if(m_newSnake.head!=S_UP) m_newSnake.head=d;
break;
case S_LEFT:
if(m_newSnake.head!=S_RIGHT) m_newSnake.head=d;
break;
case S_RIGHT:
if(m_newSnake.head!=S_LEFT) m_newSnake.head=d;
break;
}
}
//
//蛇移動
//
void CSnake::Move(void)
{
int i;
//1.計算新狀態各個節點的狀態
//保存蛇身體各個部位的形狀
for(i=0;i<m_length;i++)
{
m_oldSnake.body[i]=m_newSnake.body[i];
}
//將蛇身體的狀態根據前面的狀態變動一次
m_newSnake.tail=m_newSnake.body[m_length-1];
for(i=m_length-1;i>0;i--)
{
m_newSnake.body[i]=m_newSnake.body[i-1];
}
m_newSnake.body[0]=m_newSnake.head;
//根據新舊狀態特性取正確的狀態
m_pStateArray[0]=GetRightState(m_oldSnake.head,m_newSnake.head);
for(i=0;i<m_length;i++)
m_pStateArray[i+1]=GetRightState(m_oldSnake.body[i],m_newSnake.body[i]);
m_pStateArray[m_length+1]=GetRightState(m_oldSnake.tail,m_newSnake.tail);
//2.將整個蛇的坐標移動
//除蛇頭外，其他部分的新位置為其前一部分的原來位置
for(i=m_length+1;i>0;i--)
m_pPos[i]=m_pPos[i-1];
//蛇頭的新位置根據蛇的運動方向判斷做相應偏移
switch(m_newSnake.head)
{
case S_UP:
m_pPos[0].y-=SNAKE_MOVE;
break;
case S_DOWN:
m_pPos[0].y+=SNAKE_MOVE;
break;
case S_LEFT:
m_pPos[0].x-=SNAKE_MOVE;
break;
case S_RIGHT:
m_pPos[0].x+=SNAKE_MOVE;
break;
}
}
//
//蛇的身體增長
//
void CSnake::AddBody(int n)
{
// 分配臨時的"save類型"變量，用作保留
// 蛇的各種數據狀態
int i;
Snake_Struct saveOldSnake,saveNewSnake;
BitmapState *savestateArray;
SPoint *savePos;
//保存蛇的位置信息
// pos
savePos=new SPoint[m_length+2];
for(i=0;i<m_length+2;i++)
savePos[i]=m_pPos[i];
//保存蛇的狀態信息
// 1.oldSnake
// 2.newSnake
// 3.stateArray
//1
saveOldSnake.head=m_oldSnake.head;
saveOldSnake.body=new MoveState[m_length];
for(i=0;i<m_length;i++)
saveOldSnake.body[i]=m_oldSnake.body[i];
saveOldSnake.tail=m_oldSnake.tail;
//2
saveNewSnake.head=m_newSnake.head;
saveNewSnake.body=new MoveState[m_length];
for(i=0;i<m_length;i++)
saveNewSnake.body[i]=m_newSnake.body[i];
saveNewSnake.tail=m_newSnake.tail;
//3
savestateArray=new BitmapState[m_length+2];
for(i=0;i<m_length+2;i++)
savestateArray[i]=m_pStateArray[i];
//將長度增長
m_length+=n;
//釋放所有蛇的身體存儲數據空間
delete[] m_oldSnake.body;m_oldSnake.body=NULL;
delete[] m_newSnake.body;m_newSnake.body=NULL;
delete[] m_pStateArray;m_pStateArray=NULL;
delete[] m_pPos;m_pPos=NULL;
//創建并初始化增長后的蛇的存儲數據空間
m_newSnake.head=S_NONE;
m_oldSnake.head=S_NONE;
m_newSnake.body=new MoveState[m_length];
m_oldSnake.body=new MoveState[m_length];
for(i=0;i<m_length;i++)
{
m_newSnake.body[i]=S_NONE;
m_newSnake.body[i]=S_NONE;
}
m_newSnake.tail=S_NONE;
m_oldSnake.tail=S_NONE;
m_pStateArray=new BitmapState[m_length+2];
for(i=0;i<m_length+2;i++)
m_pStateArray[i]=M_NONE;
m_pPos=new SPoint[m_length+2];
for(i=0;i<m_length+2;i++)
{
m_pPos[i].x=0;
m_pPos[i].y=0;
}
//恢復原來長度的數據(新的用初始化的數據)
//a. newSnake ,oldSnake狀態
//b. stateArray
//c. pos
//a
m_newSnake.head=saveNewSnake.head;
m_oldSnake.head=saveOldSnake.head;
for(i=0;i<m_length-n;i++)
{
m_newSnake.body[i]=saveNewSnake.body[i];
m_oldSnake.body[i]=saveOldSnake.body[i];
}
m_newSnake.tail=saveNewSnake.tail;
m_oldSnake.tail=saveOldSnake.tail;
//b
for(i=0;i<m_length-n+2;i++)
m_pStateArray[i]=savestateArray[i];
//c
for(i=0;i<m_length-n+2;i++)
m_pPos[i]=savePos[i];
}
//
//設置蛇頭的坐標
//
void CSnake::SetHeadPos(int x,int y)
{
m_pPos[0].x=x;m_pPos[0].y=y;
}
//
//取蛇的狀態標識數組
//
BitmapState* CSnake::GetStateArray(void)
{
return m_pStateArray;
}
//
//取蛇的位置數組
//
SPoint* CSnake::GetPos(void)
{
return m_pPos;
}
//
//取蛇身的長度
//
int CSnake::GetLength(void)
{
return m_length+2;
}
//
//檢測蛇頭是否觸碰到其身體
//
bool CSnake::IsHeadTouchBody(int x,int y)
{
int i;
for(i=1;i<m_length+2;i++)
if(m_pPos[i].x==x&&m_pPos[i].y==y) return true;
return false;
}
//
//初始化 用作游戲結束后重新開始
//
void CSnake::Initial(void )
{
//釋放以前的所有存儲空間
SAFE_DELETE_ARRAY(m_pStateArray);
SAFE_DELETE_ARRAY(m_pPos);
//創建蛇身長度為1的蛇，并做各種初始化
int i;
int x = 0;
int y = 0;
//初始化蛇的坐標位置
m_length=1;
m_pPos=new SPoint[m_length+2];
m_pPos[0].x=x;m_pPos[0].y=y;
for(i=1;i<m_length+2;i++)
{
m_pPos[i].x=0;m_pPos[i].y=0;
}
//初始化蛇的運動狀態
m_newSnake.head=S_NONE;
m_oldSnake.head=S_NONE;
m_newSnake.body=new MoveState[m_length];
m_oldSnake.body=new MoveState[m_length];
for(i=0;i<m_length;i++)
{
m_newSnake.body[i]=S_NONE;
m_newSnake.body[i]=S_NONE;
}
m_newSnake.tail=S_NONE;
m_oldSnake.tail=S_NONE;
//初始化蛇的位圖顯示狀態
m_pStateArray=new BitmapState[m_length+2];
for(i=0;i<m_length+2;i++)
m_pStateArray[i]=M_NONE;
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