206 lines
2.4 KiB
C++
206 lines
2.4 KiB
C++
#include "stdafx.h"
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#include "defs.h"
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static void __sine(void);
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static void expsin(void);
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void
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eval_sin(void)
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{
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push(cadr(p1));
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eval();
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sine();
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}
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void
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sine(void)
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{
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save();
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__sine();
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restore();
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}
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static void
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__sine(void)
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{
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int n, u;
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double d;
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p1 = pop();
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if (p1->k == DOUBLE) {
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d = sin(p1->u.d);
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if (fabs(d) < 1e-10)
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d = 0.0;
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push_double(d);
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return;
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}
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if (expomode == 1) {
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push(p1);
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expsin();
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return;
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}
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// multiply by 180/pi
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push(p1);
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push_integer(180);
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multiply();
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push_symbol(PI);
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divide();
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n = pop_integer();
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if (n == (int) 0x80000000) {
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push_symbol(SIN);
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push(p1);
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list(2);
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return;
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}
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if (n < 0) {
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n = -n;
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u = -1;
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} else
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u = 1;
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switch (n % 360) {
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case 0:
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push_integer(0);
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break;
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case 30:
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push_rational(u, 2);
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break;
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case 90:
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push_integer(u);
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break;
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case 150:
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push_rational(u, 2);
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break;
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case 180:
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push_integer(0);
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break;
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case 210:
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push_rational(-u, 2);
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break;
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case 270:
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push_integer(-u);
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break;
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case 330:
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push_rational(-u, 2);
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break;
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default:
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push_symbol(SIN);
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push(p1);
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list(2);
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break;
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}
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}
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static void
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expsin(void)
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{
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save();
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p1 = pop();
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push(unit_imaginary);
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push(p1);
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multiply();
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exponential();
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push(unit_imaginary);
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divide();
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push_integer(2);
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divide();
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push(unit_imaginary);
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negate();
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push(p1);
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multiply();
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exponential();
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push(unit_imaginary);
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divide();
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push_integer(2);
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divide();
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subtract();
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restore();
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}
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static char *s[] = {
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"expomode=0",
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"",
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"sin(-pi)", // -180 degrees
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"0",
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"sin(-pi*5/6)", // -150 degrees
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"-1/2",
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"sin(-3/4*pi)", // -135 degrees
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"sin(-3/4*pi)",
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"sin(-2/3*pi)", // -120 degrees
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"sin(-2/3*pi)",
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"sin(-pi/2)", // -90 degrees
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"-1",
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"sin(-1/3*pi)", // -60 degrees
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"sin(-1/3*pi)",
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"sin(-1/4*pi)", // -45 degrees
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"sin(-1/4*pi)",
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"sin(-pi/6)", // -30 degrees
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"-1/2",
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"sin(0)", // 0 degrees
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"0",
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"sin(pi/6)", // 30 degrees
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"1/2",
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"sin(1/4*pi)", // 45 degrees
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"sin(1/4*pi)",
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"sin(1/3*pi)", // 60 degrees
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"sin(1/3*pi)",
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"sin(pi/2)", // 90 degrees
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"1",
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"sin(2/3*pi)", // 120 degrees
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"sin(2/3*pi)",
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"sin(3/4*pi)", // 135 degrees
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"sin(3/4*pi)",
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"sin(pi*5/6)", // 150 degrees
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"1/2",
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"sin(pi)", // 180 degrees
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"0",
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"sin(pi*7/6)", // 210 degrees
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"-1/2",
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"expomode=1",
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"",
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"sin(x)",
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"1/2*i*exp(-i*x)-1/2*i*exp(i*x)",
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"expomode=0",
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"",
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};
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void
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test_sin(void)
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{
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test(__FILE__, s, sizeof s / sizeof (char *));
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}
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