分類: 算法

『CRC32』同『MD5』『SHA1』壹樣,計『貳进制』數值『指紋』,佢速度快,HASH校验值肆字節.两DWORD值相等比較. 适宜網络數據傳輸, 校驗數據係咪完璧.

DWORD CRC32_Table[256] = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
};

DWORD CRC32(PBYTE buf, int len){
int i;
DWORD crc;

crc = 0xffffffffL;
for (i = 0; i < len; ++i )
crc = CRC32_Table[(crc ^ buf[i]) & 0xff] ^ (crc >> 8);

crc = crc ^ 0xffffffffL;
return crc;
}

 

首先角度格式為『0<= A <360』

小於0

while(angle < 0.0f) angle = angle + 360.0f;

大於等於360

while(angle >= 360.0f) angle = angle – 360.0f;

事因正圓分360份,即360度.360度即係0度.

當夾角誇越0度, 即BEGIN > END, 要延展角度. 即加360度.

bool Compute_Angle_In_RAC(float angle,float begin,float end){

float    _angle = Format_Angle(angle);//格式角 float    _begin = Format_Angle(begin);//格式角 float    _end  = Format_Angle(end);//格式角

if(_begin > _end){ _end   = _end + 360; if(_angle > 0 && _angle < end ) _angle = _angle + 360; }

if( _angle >= _begin && _angle <= _end )// 夾角落㸃 return true; return false; }

 

 

事因『風水羅盤』由弧扇形基座組成. 要開發弧扇形碰撞技術.

先定義弧扇結构, 『角度』『弧度』係硬幣两面, 係相, 可相互轉換換

角度 = 弧度 * 180.0/PI

弧度= 角度 * PI/180.0

弧扇形基座有两『弧度』相等弧形, 离中點距离唔同, 遠离中點弧.較埋中點弧,

typedef struct ARC2D_TYP {	弧扇結构
VECTOR2D center;	中心點
float angle;	角度
float rotate;	轉旋
float far;	最远點
float near;	最近點
}ARC2D, *ARC2D_PTR;

首要判断命中㸃是咪係『最远點』『最近點』之間.

命中㸃

Init_VECTOR2D(&va,x,y);

計觸摸㸃同弧中心㸃距離

Sub_VECTOR2D(&vdiff, &arc->center, &va);

計向量長度

float length = Length_VECTOR2D(&vdiff);

判断命中弧線之間

if(length < arc->near || length > arc->far )

return false;

計落點位於弧扇夹角之間. 弧扇夹两邊長壹致. 即等邊三角形, 視同两直角三角形.

sin(a)= 對邊/斜邊.
a= asinf (對邊/斜邊)	asinf(弧度)

計弧扇邊長

Copy_VECTOR2D(&va,&vdiff);

Init_VECTOR2D(&vb,0,length);

Sub_VECTOR2D(&vdiff, &va, &vb);

cEdge = Length_VECTOR2D(&vdiff);

計va和vb之间的夹角

cAngle = RAD_TO_DEG( asinf((cEdge / 2) / bEdge) ) * 2;

判断命中弧形夹角之間

begin = (-arc->angle/2) + arc->rotate ;

end   = (arc->angle/2) + arc->rotate ;

return Compute_Angle_In_RAC(cAngle, begin, end); // 夹角落㸃

 

判断頂是咪係弧內

bool Compute_Angle_In_RAC(float angle,float begin,float end){

float offset;

angle = Format_Angle(angle);//格式角

begin = Format_Angle(begin);//格式角

end = Format_Angle(end);//格式角

if(_begin > _end){

_end   = _end + 360;

if(_angle > 0 && _angle < end )

_angle = _angle + 360;

}

 

if( _angle >= _begin && _angle <= _end )// 夹角落㸃

return true; return false;

}

 

歸壹角/格式角

float Format_Angle(float angle){

if(angle < 0)

angle = angle + 360;

else

if(angle >= 360)

angle = angle – 360;

return angle;

}