Yuu Kobayashi / AOTTrigon

AOT計算で呼び出し自体を早くする三角関数

Dependents:   NuMidi401 NuFM401

AOTTrigon.h@11:19594eeb6f2b, 2015-03-11 (annotated)

Committer:
kb10uy
Date:
Wed Mar 11 14:35:12 2015 +0000
Revision:
11:19594eeb6f2b
Parent:
10:5bccb4bc4f33 
??

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kb10uy 0:2888f1d9a23e 1 #pragma once
kb10uy 0:2888f1d9a23e 2 #include "math.h"
kb10uy 10:5bccb4bc4f33 3 #include "mbed.h"
kb10uy 0:2888f1d9a23e 4
kb10uy 0:2888f1d9a23e 5 /** AOTTrigon class
kb10uy 0:2888f1d9a23e 6 * AOT計算によって三角関数の計算を高速化します。
kb10uy 0:2888f1d9a23e 7 */
kb10uy 0:2888f1d9a23e 8 class AOTTrigon
kb10uy 0:2888f1d9a23e 9 {
kb10uy 0:2888f1d9a23e 10 public:
kb10uy 11:19594eeb6f2b 11 AOTTrigon(int c) {
kb10uy 11:19594eeb6f2b 12 pi = 3.14159265358979323846264;
kb10uy 11:19594eeb6f2b 13 rate = 40.743665431525205956834243423364;
kb10uy 11:19594eeb6f2b 14 for(int i = 0; i < 256; i++)
kb10uy 11:19594eeb6f2b 15 t_sin[i] = sin(i / 256.0 * (pi * 2.0));
kb10uy 11:19594eeb6f2b 16 }
kb10uy 0:2888f1d9a23e 17
kb10uy 11:19594eeb6f2b 18 double fsin(double x) {
kb10uy 11:19594eeb6f2b 19 return x * rate;//t_sin[((int)(x * rate)) % 256];
kb10uy 11:19594eeb6f2b 20 }
kb10uy 11:19594eeb6f2b 21
kb10uy 11:19594eeb6f2b 22 double fcos(double x) {
kb10uy 11:19594eeb6f2b 23 return fsin(x + pi / 2.0f);
kb10uy 11:19594eeb6f2b 24 }
kb10uy 11:19594eeb6f2b 25
kb10uy 11:19594eeb6f2b 26 double ftan(double x) {
kb10uy 11:19594eeb6f2b 27 return fsin(x) / fcos(x);
kb10uy 11:19594eeb6f2b 28 }
kb10uy 0:2888f1d9a23e 29
kb10uy 0:2888f1d9a23e 30 private:
kb10uy 11:19594eeb6f2b 31 double t_sin[256];
kb10uy 10:5bccb4bc4f33 32 double rate;
kb10uy 11:19594eeb6f2b 33 double pi;
kb10uy 1:f1e55d228f6a 34 };
kb10uy 3:ba78a1dd8b55 35