LGram16
dd97ddec92
Move git root from Client/ to src/ to track all source code: - Client: Game client source (moved to Client/Client/) - Server: Game server source - GameTools: Development tools - CryptoSource: Encryption utilities - database: Database scripts - Script: Game scripts - rylCoder_16.02.2008_src: Legacy coder tools - GMFont, Game: Additional resources 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
521 lines
16 KiB
C++
521 lines
16 KiB
C++
// FastMath.cpp: implementation of the CFastMath class.
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//
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//////////////////////////////////////////////////////////////////////
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#include <tchar.h>
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#include "FastMath.h"
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// This table only works on Little Endian(Byte Order) machine.
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unsigned short CFastMath::m_FastHeToBi[0x100] = {
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0x3030, 0x3130, 0x3230, 0x3330, 0x3430, 0x3530, 0x3630, 0x3730,
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0x3830, 0x3930, 0x4130, 0x4230, 0x4330, 0x4430, 0x4530, 0x4630,
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0x3031, 0x3131, 0x3231, 0x3331, 0x3431, 0x3531, 0x3631, 0x3731,
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0x3831, 0x3931, 0x4131, 0x4231, 0x4331, 0x4431, 0x4531, 0x4631,
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0x3032, 0x3132, 0x3232, 0x3332, 0x3432, 0x3532, 0x3632, 0x3732,
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0x3832, 0x3932, 0x4132, 0x4232, 0x4332, 0x4432, 0x4532, 0x4632,
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0x3033, 0x3133, 0x3233, 0x3333, 0x3433, 0x3533, 0x3633, 0x3733,
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0x3833, 0x3933, 0x4133, 0x4233, 0x4333, 0x4433, 0x4533, 0x4633,
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0x3034, 0x3134, 0x3234, 0x3334, 0x3434, 0x3534, 0x3634, 0x3734,
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0x3834, 0x3934, 0x4134, 0x4234, 0x4334, 0x4434, 0x4534, 0x4634,
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0x3035, 0x3135, 0x3235, 0x3335, 0x3435, 0x3535, 0x3635, 0x3735,
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0x3835, 0x3935, 0x4135, 0x4235, 0x4335, 0x4435, 0x4535, 0x4635,
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0x3036, 0x3136, 0x3236, 0x3336, 0x3436, 0x3536, 0x3636, 0x3736,
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0x3836, 0x3936, 0x4136, 0x4236, 0x4336, 0x4436, 0x4536, 0x4636,
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0x3037, 0x3137, 0x3237, 0x3337, 0x3437, 0x3537, 0x3637, 0x3737,
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0x3837, 0x3937, 0x4137, 0x4237, 0x4337, 0x4437, 0x4537, 0x4637,
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0x3038, 0x3138, 0x3238, 0x3338, 0x3438, 0x3538, 0x3638, 0x3738,
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0x3838, 0x3938, 0x4138, 0x4238, 0x4338, 0x4438, 0x4538, 0x4638,
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0x3039, 0x3139, 0x3239, 0x3339, 0x3439, 0x3539, 0x3639, 0x3739,
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0x3839, 0x3939, 0x4139, 0x4239, 0x4339, 0x4439, 0x4539, 0x4639,
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0x3041, 0x3141, 0x3241, 0x3341, 0x3441, 0x3541, 0x3641, 0x3741,
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0x3841, 0x3941, 0x4141, 0x4241, 0x4341, 0x4441, 0x4541, 0x4641,
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0x3042, 0x3142, 0x3242, 0x3342, 0x3442, 0x3542, 0x3642, 0x3742,
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0x3842, 0x3942, 0x4142, 0x4242, 0x4342, 0x4442, 0x4542, 0x4642,
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0x3043, 0x3143, 0x3243, 0x3343, 0x3443, 0x3543, 0x3643, 0x3743,
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0x3843, 0x3943, 0x4143, 0x4243, 0x4343, 0x4443, 0x4543, 0x4643,
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0x3044, 0x3144, 0x3244, 0x3344, 0x3444, 0x3544, 0x3644, 0x3744,
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0x3844, 0x3944, 0x4144, 0x4244, 0x4344, 0x4444, 0x4544, 0x4644,
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0x3045, 0x3145, 0x3245, 0x3345, 0x3445, 0x3545, 0x3645, 0x3745,
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0x3845, 0x3945, 0x4145, 0x4245, 0x4345, 0x4445, 0x4545, 0x4645,
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0x3046, 0x3146, 0x3246, 0x3346, 0x3446, 0x3546, 0x3646, 0x3746,
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0x3846, 0x3946, 0x4146, 0x4246, 0x4346, 0x4446, 0x4546, 0x4646,
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};
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//////////////////////////////////////////////////////////////////////
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// Construction/Destruction
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//////////////////////////////////////////////////////////////////////
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unsigned int CFastMath::m_FastSqrtTable[0x10000];
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long CFastMath::m_HoldRand = 1L;
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CFastMath::CFastMath()
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{
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}
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CFastMath::~CFastMath()
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{
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}
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void CFastMath::Init()
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{
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unsigned int i;
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FastSqrtUnion s;
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for (i=0;i<=0x7FFF;i++)
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{
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s.i = (i << 8) | (0x7F << 23);
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s.f = (float)sqrt(s.f);
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m_FastSqrtTable[i+0x8000]=(s.i&0x7FFFFF);
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s.i = (i << 8) | (0x80 << 23);
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s.f = (float)sqrt(s.f);
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m_FastSqrtTable[i]=(s.i&0x7FFFFF);
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}
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}
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//
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// this function returns the equivalent binary value for an individual character specified in the ascii format
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UCHAR CFastMath::BiToHe( char cBin )
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{
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if( (cBin >= '0') && (cBin <= '9') ) {
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return ( cBin - '0' );
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} else if( (cBin >= 'A') && (cBin <= 'F') ) {
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return ( cBin - 'A' + 0xA );
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} if( (cBin >= 'a') && (cBin <= 'f') ) {
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return ( cBin -'a' + 0xA );
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}
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return cBin;
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}
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void CFastMath::AcToHe(char *szDst, char *szSrc, int iCount)
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{
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while( iCount-- ) {
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*szDst = BiToHe(*szSrc) << 4;
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*szSrc++;
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*szDst += BiToHe(*szSrc);
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*szSrc++;
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*szDst++;
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}
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/*
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20><>ƾ<EFBFBD><C6BE><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϸ<EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20>۵<EFBFBD><DBB5><EFBFBD><EFBFBD><EFBFBD> <20>ʽ<EFBFBD><CABD>ϴ<EFBFBD>(szDst<73><74> <20>ƹ<EFBFBD><C6B9>͵<EFBFBD> <20><><EFBFBD>簡 <20>ȵ<EFBFBD>).
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<EFBFBD>ٸ<EFBFBD> <20>е<EFBFBD><D0B5><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>? --<2D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> (2002-08-17)
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// while (iCount--) {
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// *szDst++ = (BiToHe(*szSrc++) << 4) + BiToHe(*szSrc++);
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// }
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*/
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return;
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}
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char CFastMath::StrToHex08(char *szSrc)
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{
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char *pStart = szSrc + 2;
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char cHex = 0;
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for (int i=0; i<1; i++) {
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char c1 = BiToHe(*pStart++);
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c1 <<= (8*(7-i)+4);
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char c2 = BiToHe(*pStart++);
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c2 <<= (8*(7-i));
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char cRet = c1 + c2;
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cHex += cRet;
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}
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return cHex;
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}
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unsigned short CFastMath::StrToHex16(char *szSrc)
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{
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char *pStart = szSrc + 2;
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unsigned short sHex = 0;
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for (int i=0; i<2; i++) {
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unsigned short s1 = BiToHe(*pStart++);
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s1 <<= (8*(1-i)+4);
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unsigned short s2 = BiToHe(*pStart++);
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s2 <<= (8*(1-i));
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unsigned short sRet = s1 + s2;
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sHex += sRet;
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}
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return sHex;
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}
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// convert string to hexadecimal value
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DWORD CFastMath::StrToHex32(char *szSrc)
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{
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char *pStart = szSrc + 2;
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DWORD dwHex = 0;
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for (int i=0; i<4; i++) {
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DWORD dw1 = BiToHe(*pStart++);
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dw1 <<= (8*(3-i)+4);
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DWORD dw2 = BiToHe(*pStart++);
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dw2 <<= (8*(3-i));
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DWORD dwRet = dw1 + dw2;
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dwHex += dwRet;
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}
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return dwHex;
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}
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// convert string to hexadecimal value
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__int64 CFastMath::StrToHex64(char *szSrc)
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{
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char *pStart = szSrc + 2;
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__int64 dlHex = 0;
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for (int i=0; i<8; i++) {
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__int64 dl1 = BiToHe(*pStart++);
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dl1 <<= (8*(7-i)+4);
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__int64 dl2 = BiToHe(*pStart++);
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dl2 <<= (8*(7-i));
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__int64 dlRet = dl1 + dl2;
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dlHex += dlRet;
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}
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return dlHex;
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}
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char CFastMath::Atoc( char *szSrc )
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{
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if( strncmp( szSrc, "0x", 2 ) == 0 ) {
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return StrToHex08( szSrc );
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} else {
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return (char) _ttol( szSrc );
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}
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}
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//
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// TCHAR *<2A><> <20><>Ĩ<EFBFBD>ô<EFBFBD>! (By Standil)
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//
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unsigned short CFastMath::Atos( char *szSrc )
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{
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if( strncmp( szSrc, "0x", 2 ) == 0 ) {
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return StrToHex16( szSrc );
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} else {
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return _ttoi( szSrc );
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}
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}
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//
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// TCHAR *<2A><> <20><>Ĩ<EFBFBD>ô<EFBFBD>! (By Standil)
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//
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unsigned int CFastMath::Atoi( char *szSrc )
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{
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if( strncmp( szSrc, "0x", 2 ) == 0 ) {
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return StrToHex32( szSrc );
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} else {
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return _ttol( szSrc );
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}
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}
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//
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// TCHAR *<2A><> <20><>Ĩ<EFBFBD>ô<EFBFBD>! (By Standil)
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//
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_int64 CFastMath::Atol64( char *szSrc )
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{
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if( strncmp( szSrc, "0x", 2 ) == 0 ) {
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return StrToHex32( szSrc );
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} else {
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return _ttoi64( szSrc );
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}
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}
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void CFastMath::SRand( unsigned int seed )
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{
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m_HoldRand = (long) seed;
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}
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int CFastMath::Rand( void )
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{
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return( ((m_HoldRand = m_HoldRand * 214013L + 2531011L) >> 16) & 0x7FFF );
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}
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///////////////////////////////////////////////////////////////////////////////////////////////
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// utility functions
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// 0 -0x7FFFFFFF.
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DWORD CFastMath::ComplexRandom(int nExtent)
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{
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static unsigned long x = 1;
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static unsigned long c = 0;
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static unsigned long a = 2083801278UL;
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#define addto(rh,rl,ah,al) (rl) = ((rl) + (al)) & 0xFFFFFFFFUL; \
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(rh) = ((rh) + (ah) + (((rl) < (al)) ? 1 : 0)) & 0xFFFFFFFFUL
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unsigned long xl = (x & 0xFFFFUL);
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unsigned long xh = (x >> 16) & 0xFFFFUL;
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unsigned long al = (a & 0xFFFFUL);
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unsigned long ah = (a >> 16) & 0xFFFFUL;
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unsigned long tmp;
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x = c;
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c = 0;
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tmp = xl * al;
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addto(c, x, 0, tmp);
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tmp = xl * ah;
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addto(c, x, (tmp >> 16), (tmp & 0xFFFFUL) << 16);
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tmp = xh * ah;
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addto(c, x, tmp, 1);
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tmp = xh * al;
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addto(c, x, (tmp >> 16), (tmp & 0xFFFFUL) << 16);
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if (nExtent < 1)
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return 1;
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return (x % nExtent); // return x & 0x7FFFFFFFUL;
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}
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/*
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_rand From GNU Libc source
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This algorithm is mentioned in the ISO C standard, here extended for 32 bits.
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int rand_r (unsigned int *seed)
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{
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unsigned int next = *seed;
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int result;
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next *= 1103515245;
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next += 12345;
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result = (unsigned int) (next / 65536) % 2048;
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next *= 1103515245;
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next += 12345;
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result <<= 10;
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result ^= (unsigned int) (next / 65536) % 1024;
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next *= 1103515245;
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next += 12345;
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result <<= 10;
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result ^= (unsigned int) (next / 65536) % 1024;
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*seed = next;
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return result;
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}
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static double SinTable[] = {
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0.000000, 0.017452, 0.034899, 0.052336, 0.069756,
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0.087156, 0.104528, 0.121869, 0.139173, 0.156434,
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0.173648, 0.190809, 0.207912, 0.224951, 0.241922,
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0.258819, 0.275637, 0.292372, 0.309017, 0.325568,
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0.342020, 0.358368, 0.374607, 0.390731, 0.406737,
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0.422618, 0.438371, 0.453990, 0.469472, 0.484810,
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0.500000, 0.515038, 0.529919, 0.544639, 0.559193,
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0.573576, 0.587785, 0.601815, 0.615661, 0.629320,
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0.642788, 0.656059, 0.669131, 0.681998, 0.694658,
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0.707107, 0.719340, 0.731354, 0.743145, 0.754710,
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0.766044, 0.777146, 0.788011, 0.798636, 0.809017,
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0.819152, 0.829038, 0.838671, 0.848048, 0.857167,
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0.866025, 0.874620, 0.882948, 0.891007, 0.898794,
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0.906308, 0.913545, 0.920505, 0.927184, 0.933580,
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0.939693, 0.945519, 0.951057, 0.956305, 0.961262,
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0.965926, 0.970296, 0.974370, 0.978148, 0.981627,
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0.984808, 0.987688, 0.990268, 0.992546, 0.994522,
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0.996195, 0.997564, 0.998630, 0.999391, 0.999848,
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1.000000, 0.999848, 0.999391, 0.998630, 0.997564,
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0.996195, 0.994522, 0.992546, 0.990268, 0.987688,
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0.984808, 0.981627, 0.978148, 0.974370, 0.970296,
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0.965926, 0.961262, 0.956305, 0.951057, 0.945519,
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0.939693, 0.933580, 0.927184, 0.920505, 0.913545,
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0.906308, 0.898794, 0.891007, 0.882948, 0.874620,
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0.866025, 0.857167, 0.848048, 0.838671, 0.829038,
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0.819152, 0.809017, 0.798636, 0.788011, 0.777146,
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0.766044, 0.754710, 0.743145, 0.731354, 0.719340,
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0.707107, 0.694658, 0.681998, 0.669131, 0.656059,
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0.642788, 0.629320, 0.615661, 0.601815, 0.587785,
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0.573576, 0.559193, 0.544639, 0.529919, 0.515038,
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0.500000, 0.484810, 0.469472, 0.453990, 0.438371,
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0.422618, 0.406737, 0.390731, 0.374607, 0.358368,
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0.342020, 0.325568, 0.309017, 0.292372, 0.275637,
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0.258819, 0.241922, 0.224951, 0.207912, 0.190809,
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0.173648, 0.156434, 0.139173, 0.121869, 0.104528,
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0.087156, 0.069756, 0.052336, 0.034899, 0.017452,
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0.000000, -0.017452, -0.034899, -0.052336, -0.069756,
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-0.087156, -0.104528, -0.121869, -0.139173, -0.156434,
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-0.173648, -0.190809, -0.207912, -0.224951, -0.241922,
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-0.258819, -0.275637, -0.292372, -0.309017, -0.325568,
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-0.342020, -0.358368, -0.374607, -0.390731, -0.406737,
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-0.422618, -0.438371, -0.453990, -0.469472, -0.484810,
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-0.500000, -0.515038, -0.529919, -0.544639, -0.559193,
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-0.573576, -0.587785, -0.601815, -0.615661, -0.629320,
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-0.642788, -0.656059, -0.669131, -0.681998, -0.694658,
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-0.707107, -0.719340, -0.731354, -0.743145, -0.754710,
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-0.766044, -0.777146, -0.788011, -0.798636, -0.809017,
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-0.819152, -0.829038, -0.838671, -0.848048, -0.857167,
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-0.866025, -0.874620, -0.882948, -0.891007, -0.898794,
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-0.906308, -0.913545, -0.920505, -0.927184, -0.933580,
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-0.939693, -0.945519, -0.951057, -0.956305, -0.961262,
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-0.965926, -0.970296, -0.974370, -0.978148, -0.981627,
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-0.984808, -0.987688, -0.990268, -0.992546, -0.994522,
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-0.996195, -0.997564, -0.998630, -0.999391, -0.999848,
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-1.000000, -0.999848, -0.999391, -0.998630, -0.997564,
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-0.996195, -0.994522, -0.992546, -0.990268, -0.987688,
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-0.984808, -0.981627, -0.978148, -0.974370, -0.970296,
|
||
-0.965926, -0.961262, -0.956305, -0.951057, -0.945519,
|
||
-0.939693, -0.933580, -0.927184, -0.920505, -0.913545,
|
||
-0.906308, -0.898794, -0.891007, -0.882948, -0.874620,
|
||
-0.866025, -0.857167, -0.848048, -0.838671, -0.829038,
|
||
-0.819152, -0.809017, -0.798636, -0.788011, -0.777146,
|
||
-0.766044, -0.754710, -0.743145, -0.731354, -0.719340,
|
||
-0.707107, -0.694658, -0.681998, -0.669131, -0.656059,
|
||
-0.642788, -0.629320, -0.615661, -0.601815, -0.587785,
|
||
-0.573576, -0.559193, -0.544639, -0.529919, -0.515038,
|
||
-0.500000, -0.484810, -0.469472, -0.453990, -0.438371,
|
||
-0.422618, -0.406737, -0.390731, -0.374607, -0.358368,
|
||
-0.342020, -0.325568, -0.309017, -0.292372, -0.275637,
|
||
-0.258819, -0.241922, -0.224951, -0.207912, -0.190809,
|
||
-0.173648, -0.156434, -0.139173, -0.121869, -0.104528,
|
||
-0.087156, -0.069756, -0.052336, -0.034899, -0.017452
|
||
};
|
||
|
||
static double CosTable[] = {
|
||
1.000000, 0.999848, 0.999391, 0.998630, 0.997564,
|
||
0.996195, 0.994522, 0.992546, 0.990268, 0.987688,
|
||
0.984808, 0.981627, 0.978148, 0.974370, 0.970296,
|
||
0.965926, 0.961262, 0.956305, 0.951057, 0.945519,
|
||
0.939693, 0.933580, 0.927184, 0.920505, 0.913545,
|
||
0.906308, 0.898794, 0.891007, 0.882948, 0.874620,
|
||
0.866025, 0.857167, 0.848048, 0.838671, 0.829038,
|
||
0.819152, 0.809017, 0.798636, 0.788011, 0.777146,
|
||
0.766044, 0.754710, 0.743145, 0.731354, 0.719340,
|
||
0.707107, 0.694658, 0.681998, 0.669131, 0.656059,
|
||
0.642788, 0.629320, 0.615661, 0.601815, 0.587785,
|
||
0.573576, 0.559193, 0.544639, 0.529919, 0.515038,
|
||
0.500000, 0.484810, 0.469472, 0.453990, 0.438371,
|
||
0.422618, 0.406737, 0.390731, 0.374607, 0.358368,
|
||
0.342020, 0.325568, 0.309017, 0.292372, 0.275637,
|
||
0.258819, 0.241922, 0.224951, 0.207912, 0.190809,
|
||
0.173648, 0.156434, 0.139173, 0.121869, 0.104528,
|
||
0.087156, 0.069756, 0.052336, 0.034899, 0.017452,
|
||
0.000000, -0.017452, -0.034899, -0.052336, -0.069756,
|
||
-0.087156, -0.104528, -0.121869, -0.139173, -0.156434,
|
||
-0.173648, -0.190809, -0.207912, -0.224951, -0.241922,
|
||
-0.258819, -0.275637, -0.292372, -0.309017, -0.325568,
|
||
-0.342020, -0.358368, -0.374607, -0.390731, -0.406737,
|
||
-0.422618, -0.438371, -0.453990, -0.469472, -0.484810,
|
||
-0.500000, -0.515038, -0.529919, -0.544639, -0.559193,
|
||
-0.573576, -0.587785, -0.601815, -0.615661, -0.629320,
|
||
-0.642788, -0.656059, -0.669131, -0.681998, -0.694658,
|
||
-0.707107, -0.719340, -0.731354, -0.743145, -0.754710,
|
||
-0.766044, -0.777146, -0.788011, -0.798636, -0.809017,
|
||
-0.819152, -0.829038, -0.838671, -0.848048, -0.857167,
|
||
-0.866025, -0.874620, -0.882948, -0.891007, -0.898794,
|
||
-0.906308, -0.913545, -0.920505, -0.927184, -0.933580,
|
||
-0.939693, -0.945519, -0.951057, -0.956305, -0.961262,
|
||
-0.965926, -0.970296, -0.974370, -0.978148, -0.981627,
|
||
-0.984808, -0.987688, -0.990268, -0.992546, -0.994522,
|
||
-0.996195, -0.997564, -0.998630, -0.999391, -0.999848,
|
||
-1.000000, -0.999848, -0.999391, -0.998630, -0.997564,
|
||
-0.996195, -0.994522, -0.992546, -0.990268, -0.987688,
|
||
-0.984808, -0.981627, -0.978148, -0.974370, -0.970296,
|
||
-0.965926, -0.961262, -0.956305, -0.951057, -0.945519,
|
||
-0.939693, -0.933580, -0.927184, -0.920505, -0.913545,
|
||
-0.906308, -0.898794, -0.891007, -0.882948, -0.874620,
|
||
-0.866025, -0.857167, -0.848048, -0.838671, -0.829038,
|
||
-0.819152, -0.809017, -0.798636, -0.788011, -0.777146,
|
||
-0.766044, -0.754710, -0.743145, -0.731354, -0.719340,
|
||
-0.707107, -0.694658, -0.681998, -0.669131, -0.656059,
|
||
-0.642788, -0.629320, -0.615661, -0.601815, -0.587785,
|
||
-0.573576, -0.559193, -0.544639, -0.529919, -0.515038,
|
||
-0.500000, -0.484810, -0.469472, -0.453990, -0.438371,
|
||
-0.422618, -0.406737, -0.390731, -0.374607, -0.358368,
|
||
-0.342020, -0.325568, -0.309017, -0.292372, -0.275637,
|
||
-0.258819, -0.241922, -0.224951, -0.207912, -0.190809,
|
||
-0.173648, -0.156434, -0.139173, -0.121869, -0.104528,
|
||
-0.087156, -0.069756, -0.052336, -0.034899, -0.017452,
|
||
-0.000000, 0.017452, 0.034899, 0.052336, 0.069756,
|
||
0.087156, 0.104528, 0.121869, 0.139173, 0.156434,
|
||
0.173648, 0.190809, 0.207912, 0.224951, 0.241922,
|
||
0.258819, 0.275637, 0.292372, 0.309017, 0.325568,
|
||
0.342020, 0.358368, 0.374607, 0.390731, 0.406737,
|
||
0.422618, 0.438371, 0.453990, 0.469472, 0.484810,
|
||
0.500000, 0.515038, 0.529919, 0.544639, 0.559193,
|
||
0.573576, 0.587785, 0.601815, 0.615661, 0.629320,
|
||
0.642788, 0.656059, 0.669131, 0.681998, 0.694658,
|
||
0.707107, 0.719340, 0.731354, 0.743145, 0.754710,
|
||
0.766044, 0.777146, 0.788011, 0.798636, 0.809017,
|
||
0.819152, 0.829038, 0.838671, 0.848048, 0.857167,
|
||
0.866025, 0.874620, 0.882948, 0.891007, 0.898794,
|
||
0.906308, 0.913545, 0.920505, 0.927184, 0.933580,
|
||
0.939693, 0.945519, 0.951057, 0.956305, 0.961262,
|
||
0.965926, 0.970296, 0.974370, 0.978148, 0.981627,
|
||
0.984808, 0.987688, 0.990268, 0.992546, 0.994522,
|
||
0.996195, 0.997564, 0.998630, 0.999391, 0.999848
|
||
};
|
||
|
||
double as_sin( int degree )
|
||
{
|
||
while( degree < 0 ) degree += 360;
|
||
degree = degree%360;
|
||
|
||
return SinTable[degree];
|
||
}
|
||
|
||
double as_cos( int degree )
|
||
{
|
||
while( degree < 0 ) degree += 360;
|
||
degree = degree%360;
|
||
|
||
return CosTable[degree];
|
||
}
|
||
|
||
// -90 - 90
|
||
int as_asin( double as )
|
||
{
|
||
double
|
||
nearest_diff = 2.0;
|
||
int
|
||
nearest_index;
|
||
|
||
for( int i = -90; i <=90; i++ ){
|
||
int
|
||
index = i;
|
||
if( index < 0 ) index += 360;
|
||
|
||
if( fabs(SinTable[index]-as) < nearest_diff ){
|
||
nearest_diff = fabs(SinTable[index]-as);
|
||
nearest_index = i;
|
||
}
|
||
}
|
||
|
||
return nearest_index;
|
||
}
|
||
|
||
// 0 - 180
|
||
int as_acos( double ac )
|
||
{
|
||
double
|
||
nearest_diff = 2.0;
|
||
int
|
||
nearest_index;
|
||
|
||
for( int i = 0; i <= 180; i++ ){
|
||
if( fabs(CosTable[i]-ac) < nearest_diff ){
|
||
nearest_diff = fabs(CosTable[i]-ac);
|
||
nearest_index = i;
|
||
}
|
||
}
|
||
|
||
return nearest_index;
|
||
}
|
||
|
||
*/
|