?? sinecosine.java
字號(hào):
/**
* 非作者授權(quán),請(qǐng)勿用于商業(yè)用途。
* @author bruce.fine@gmail.com
* sin cos 表格求法
* */
public class Sinecosine {
static short sineTable[] = {
0, 4, 9, 13, 18, 22, 27, 31, 36, 40,
44, 49, 53, 58, 62, 66, 71, 75, 79, 83,
88, 92, 96, 100, 104, 108, 112, 116, 120, 124,
128, 132, 136, 139, 143, 147, 150, 154, 158, 161,
165, 168, 171, 175, 178, 181, 184, 187, 190, 193,
196, 199, 202, 204, 207, 210, 212, 215, 217, 219,
222, 224, 226, 228, 230, 232, 234, 236, 237, 239,
241, 242, 243, 245, 246, 247, 248, 249, 250, 251,
252, 253, 254, 254, 255, 255, 255, 1, 1, 1,
1
};
static int sinFP(int angle) {
int sin;
if (angle <= 90) {
sin = sineTable[angle];
if (sin == 1) {
sin = 256;
}
}
else if (angle <= 180) {
sin = sineTable[180 - angle];
if (sin == 1) {
sin = 256;
}
}
else if (angle <= 270) {
sin = -sineTable[angle - 180];
if (sin == -1) {
sin = -256;
}
}
else { /* angle <= 360 */
sin = -sineTable[360 - angle];
if (sin == -1) {
sin = -256;
}
}
return sin;
}
static int cosFP(int angle) {
int cos;
if (angle <= 90) {
cos = sineTable[90 - angle];
if (cos == 1) {
cos = 256;
}
}
else if (angle <= 180) {
cos = -sineTable[angle - 90];
if (cos == -1) {
cos = -256;
}
}
else if (angle <= 270) {
cos = -sineTable[270 - angle];
if (cos == -1) {
cos = -256;
}
}
else { /* angle <= 360 */
cos = sineTable[angle - 270];
if (cos == 1) {
cos = 256;
}
}
return cos;
}
}
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