intmath.java

来自「Sony Ericsson手机上的Facebook客户端全套代码」· Java 代码 · 共 208 行

// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) 
// Source File Name:   IntMath.java

package se.southend.drops.math;


public class IntMath
{

    public IntMath()
    {
    }

    public static final int abs(int value)
    {
        return value >= 0 ? value : -value;
    }

    public static final int max(int value1, int value2)
    {
        return value1 <= value2 ? value2 : value1;
    }

    public static final int min(int value1, int value2)
    {
        return value1 >= value2 ? value2 : value1;
    }

    public static final int cos(int alpha)
    {
        alpha &= 0x3ff;
        if(alpha < 256)
            return cos[alpha];
        if(alpha < 512)
            return -cos[511 - alpha];
        if(alpha < 768)
            return -cos[alpha - 512];
        else
            return cos[1023 - alpha];
    }

    public static final int sin(int alpha)
    {
        alpha &= 0x3ff;
        if(alpha < 256)
            return cos[255 - alpha];
        if(alpha < 512)
            return cos[alpha - 256];
        if(alpha < 768)
            return -cos[767 - alpha];
        else
            return -cos[alpha - 768];
    }

    public static final int sqrt(long val)
    {
        if(val > 1L)
            if(val < 4L)
            {
                val++;
                val >>= 1;
            } else
            if(val < 16L)
            {
                val += 11L;
                val /= 6L;
            } else
            if(val < 64L)
            {
                val += 96L;
                val = 1520L / val;
                val = 17L - val;
            } else
            if(val < 256L)
            {
                val += 390L;
                val = 12020L / val;
                val = 34L - val;
            } else
            if(val < 1024L)
            {
                val += 1535L;
                val = 0x17638L / val;
                val = 69L - val;
            } else
            if(val < 4096L)
            {
                val += 6185L;
                val = 0xbb500L / val;
                val = 138L - val;
            } else
            if(val < 16384L)
            {
                val += 24810L;
                val = 0x5da800L / val;
                val = 276L - val;
            } else
            if(val < 0x10000L)
            {
                val += 0x182f2L;
                val = 0x2ed0000L / val;
                val = 553L - val;
            } else
            if(val < 0x40000L)
            {
                val += 0x60d9cL;
                val = 0x176a0000L / val;
                val = 1106L - val;
            } else
            if(val < 0x100000L)
            {
                val >>= 2;
                val += 0x60d9cL;
                val = 0x176a0000L / val;
                val = 1106L - val;
                val <<= 1;
            } else
            if(val < 0x400000L)
            {
                val >>= 4;
                val += 0x60d9cL;
                val = 0x176a0000L / val;
                val = 1106L - val;
                val <<= 2;
            } else
            if(val < 0x1000000L)
            {
                val >>= 6;
                val += 0x60d9cL;
                val = 0x176a0000L / val;
                val = 1106L - val;
                val <<= 3;
            } else
            if(val < 0x4000000L)
            {
                val >>= 8;
                val += 0x60d9cL;
                val = 0x176a0000L / val;
                val = 1106L - val;
                val <<= 4;
            } else
            if(val < 0x10000000L)
            {
                val >>= 10;
                val += 0x60d9cL;
                val = 0x176a0000L / val;
                val = 1106L - val;
                val <<= 5;
            } else
            if(val < 0x40000000L)
            {
                val >>= 12;
                val += 0x60d9cL;
                val = 0x176a0000L / val;
                val = 1106L - val;
                val <<= 6;
            } else
            {
                val >>= 14;
                val += 0x60d9cL;
                val = 0x176a0000L / val;
                val = 1106L - val;
                val <<= 7;
            }
        return (int)val;
    }

    public static final int UNIT = 16;
    public static final int SQRT_2 = 0x16a0a;
    public static final int PI = 0x3243f;
    public static final int QUARTER_PERIOD = 256;
    public static final int HALF_PERIOD = 512;
    public static final int THREE_QUARTER_PERIOD = 768;
    public static final int PERIOD = 1024;
    public static final int EIGHTH_PERIOD = 128;
    private static final int cos[] = {
        0x10000, 65534, 65531, 65524, 65516, 65505, 65491, 65475, 65457, 65436, 
        65412, 65386, 65358, 65327, 65294, 65258, 65220, 65179, 65136, 65091, 
        65043, 64992, 64939, 64884, 64826, 64766, 64703, 64638, 64571, 64501, 
        64428, 64353, 64276, 64197, 64115, 64030, 63943, 63854, 63762, 63668, 
        63571, 63473, 63371, 63268, 63162, 63053, 62942, 62829, 62714, 62596, 
        62475, 62353, 62228, 62100, 61971, 61839, 61705, 61568, 61429, 61288, 
        61144, 60998, 60850, 60700, 60547, 60392, 60235, 60075, 59913, 59749, 
        59583, 59414, 59243, 59070, 58895, 58718, 58538, 58356, 58172, 57986, 
        57797, 57606, 57414, 57219, 57022, 56822, 56621, 56417, 56212, 56004, 
        55794, 55582, 55368, 55152, 54933, 54713, 54491, 54266, 54040, 53811, 
        53581, 53348, 53114, 52877, 52639, 52398, 52155, 51911, 51665, 51416, 
        51166, 50914, 50660, 50403, 50146, 49886, 49624, 49360, 49095, 48828, 
        48558, 48288, 48015, 47740, 47464, 47186, 46906, 46624, 46340, 46055, 
        45768, 45480, 45189, 44897, 44603, 44308, 44011, 43712, 43412, 43110, 
        42806, 42501, 42194, 41885, 41575, 41263, 40950, 40636, 40319, 40002, 
        39682, 39362, 39039, 38716, 38390, 38064, 37736, 37406, 37075, 36743, 
        36409, 36074, 35738, 35400, 35061, 34721, 34379, 34036, 33692, 33346, 
        32999, 32651, 32302, 31952, 31600, 31247, 30893, 30538, 30181, 29824, 
        29465, 29105, 28745, 28383, 28020, 27656, 27291, 26925, 26557, 26189, 
        25820, 25450, 25079, 24707, 24334, 23960, 23586, 23210, 22833, 22456, 
        22078, 21699, 21319, 20938, 20557, 20175, 19792, 19408, 19024, 18638, 
        18253, 17866, 17479, 17091, 16702, 16313, 15923, 15533, 15142, 14751, 
        14359, 13966, 13573, 13179, 12785, 12390, 11995, 11600, 11204, 10807, 
        10410, 10013, 9616, 9218, 8819, 8421, 8022, 7623, 7223, 6823, 
        6423, 6023, 5622, 5222, 4821, 4420, 4018, 3617, 3215, 2814, 
        2412, 2010, 1608, 1206, 804, 402
    };

}