mirror of https://github.com/dirtbags/tanks.git
94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
#include <stdlib.h>
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#include <math.h>
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#include "trig.h"
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#ifndef max
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#define max(a,b) (((a) > (b)) ? (a) : (b))
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#define min(a,b) (((a) < (b)) ? (a) : (b))
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#endif
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static float trig_cos_table[] = {
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1.000000, 0.999848, 0.999391, 0.998630, 0.997564, 0.996195,
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0.994522, 0.992546, 0.990268, 0.987688, 0.984808, 0.981627,
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0.978148, 0.974370, 0.970296, 0.965926, 0.961262, 0.956305,
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0.951057, 0.945519, 0.939693, 0.933580, 0.927184, 0.920505,
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0.913545, 0.906308, 0.898794, 0.891007, 0.882948, 0.874620,
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0.866025, 0.857167, 0.848048, 0.838671, 0.829038, 0.819152,
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0.809017, 0.798636, 0.788011, 0.777146, 0.766044, 0.754710,
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0.743145, 0.731354, 0.719340, 0.707107, 0.694658, 0.681998,
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0.669131, 0.656059, 0.642788, 0.629320, 0.615661, 0.601815,
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0.587785, 0.573576, 0.559193, 0.544639, 0.529919, 0.515038,
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0.500000, 0.484810, 0.469472, 0.453990, 0.438371, 0.422618,
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0.406737, 0.390731, 0.374607, 0.358368, 0.342020, 0.325568,
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0.309017, 0.292372, 0.275637, 0.258819, 0.241922, 0.224951,
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0.207912, 0.190809, 0.173648, 0.156434, 0.139173, 0.121869,
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0.104528, 0.087156, 0.069756, 0.052336, 0.034899, 0.017452,
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0.000000,
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};
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float
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trig_cos(int angle)
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{
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int a;
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float ret;
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a = abs(angle) % 180;
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if (a > 90) {
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a = 180 - a;
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}
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ret = trig_cos_table[a];
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a = abs(angle) % 360;
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if ((a > 90) && (a < 270)) {
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ret = -ret;
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}
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return ret;
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}
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float
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trig_sin(int angle)
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{
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return trig_cos(90 - angle);
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}
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float
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trig_tan(int angle)
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{
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return trig_sin(angle) / trig_cos(angle);
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}
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int
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trig_asin(float x)
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{
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return rad2deg(asinf(x));
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}
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int
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trig_acos(float x)
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{
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return rad2deg(acosf(x));
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}
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int
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trig_atan2(float y, float x)
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{
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return rad2deg(atan2f(y, x));
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}
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#if 0
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#include <stdio.h>
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int
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main()
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{
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int i, j;
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float f;
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int t;
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for (i = 0; i < 600; i += 1) {
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printf("%-04d %-0.6f %-0.6f\n", i, trig_cos(i), cosf(deg2rad(i)));
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}
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return 0;
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}
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#endif
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