mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-10-03 18:09:02 -04:00
98 lines
1.8 KiB
C
98 lines
1.8 KiB
C
#pragma once
|
|
//
|
|
// FILE: FastTrig.h
|
|
// AUTHOR: Rob Tillaart
|
|
// VERSION: 0.3.1
|
|
// PURPOSE: Arduino library for a faster approximation of sin() and cos()
|
|
// DATE: 2011-08-18
|
|
// URL: https://github.com/RobTillaart/FastTrig
|
|
// https://forum.arduino.cc/index.php?topic=69723.0
|
|
|
|
|
|
#ifdef ESP_PLATFORM
|
|
#include <math.h>
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#else
|
|
#include "Arduino.h"
|
|
#endif
|
|
|
|
|
|
#define FAST_TRIG_LIB_VERSION (F("0.3.1"))
|
|
|
|
#ifdef __cplusplus
|
|
extern "C"
|
|
{
|
|
#endif
|
|
|
|
extern uint16_t sinTable16[];
|
|
extern uint8_t sinTable8[];
|
|
|
|
|
|
///////////////////////////////////////////////////////
|
|
//
|
|
// GONIO INT EXPERIMENTAL
|
|
//
|
|
int isin256(uint32_t v);
|
|
int icos256(uint32_t v);
|
|
|
|
// calculate both in one call.
|
|
void isincos256(uint32_t v, int &si, int &co);
|
|
|
|
|
|
///////////////////////////////////////////////////////
|
|
//
|
|
// GONIO LOOKUP
|
|
//
|
|
float isin(float f);
|
|
|
|
float icos(float x);
|
|
|
|
// calculate both in one call.
|
|
void isincos(float v, float &si, float &co);
|
|
|
|
|
|
float itan(float f);
|
|
|
|
// 0 returns NAN but we have a icot(x) cotangent.
|
|
float icot(float f);
|
|
|
|
|
|
///////////////////////////////////////////////////////
|
|
//
|
|
// INVERSE GONIO LOOKUP
|
|
//
|
|
float iasin(float f);
|
|
|
|
float iacos(float f);
|
|
|
|
// PLACEHOLDER (might be obsolete due to atanFast() formula.
|
|
float iatan(float f);
|
|
|
|
// fast atan() formula, in fact a modified Taylor expansion
|
|
// input = -1 .. 1
|
|
float atanFast(float f);
|
|
|
|
inline float atanHelper(float x);
|
|
|
|
// atan2Fast() folds and mirrors => calls atanFast() + offset.
|
|
float atan2Fast(float y, float x);
|
|
|
|
|
|
///////////////////////////////////////////////////////
|
|
//
|
|
// HYPOT
|
|
// related but not strict gonio.
|
|
//
|
|
// hypotFast() formula for faster hypot() at the price of accuracy
|
|
// experimental!
|
|
float hypotFast(float x, float y);
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
|
|
// -- END OF FILE --
|