Macros | Functions
hal_gfx_math.h File Reference

Header file containing functions prototypes of Graphics library. More...

Go to the source code of this file.

## Macros
#define | HAL_GFX_E 2.71828182845904523536f
| e More...
#define | HAL_GFX_LOG2E 1.44269504088896340736f
| log2(e) More...
#define | HAL_GFX_LOG10E 0.434294481903251827651f
| log10(e) More...
#define | HAL_GFX_LN2 0.693147180559945309417f
| ln(2) More...
#define | HAL_GFX_LN10 2.30258509299404568402f
| ln(10) More...
#define | HAL_GFX_PI 3.14159265358979323846f
| pi More...
#define | HAL_GFX_PI_2 1.57079632679489661923f
| pi/2 More...
#define | HAL_GFX_PI_4 0.785398163397448309616f
| pi/4 More...
#define | HAL_GFX_1_PI 0.318309886183790671538f
| 1/pi More...
#define | HAL_GFX_2_PI 0.636619772367581343076f
| 2/pi More...
#define | HAL_GFX_2_SQRTPI 1.12837916709551257390f
| 2/sqrt(pi) More...
#define | HAL_GFX_SQRT2 1.41421356237309504880f
| sqrt(2) More...
#define | HAL_GFX_SQRT1_2 0.707106781186547524401f
| 1/sqrt(2) More...
#define | hal_gfx_min2(a, b) (((a)<(b))?( a):(b))
| Find the minimum of two values. More...
#define | hal_gfx_max2(a, b) (((a)>(b))?( a):(b))
| Find the maximum of two values. More...
#define | hal_gfx_clamp(val, min, max) hal_gfx_min2((max), hal_gfx_max2((min), (val)))
| Clamp value. More...
#define | hal_gfx_abs(a) (((a)< 0 )?(-(a)):(a))
| Calculate the absolute value of int. More...
#define | hal_gfx_absf(a) (((a)< 0.f )?(-(a)):(a))
| Calculate the absolute value of float. More...
#define | hal_gfx_floats_equal(x, y) (hal_gfx_absf((x) - (y)) <= 0.00001f * hal_gfx_min2(hal_gfx_absf(x), hal_gfx_absf(y)))
| Compare two floats. More...
#define | hal_gfx_float_is_zero(x) (hal_gfx_absf(x) <= 0.00001f)
| Checks if value x is zero. More...
#define | hal_gfx_deg_to_rad(d) (0.0174532925199f * (d))
| Convert degrees to radians. More...
#define | hal_gfx_rad_to_deg(r) (57.295779513f * (r))
| onvert radians to degries. More...
#define | hal_gfx_i2fx(a) ((a)*0x10000)
| Convert integer to 16.16 fixed point. More...
#define | hal_gfx_floor(f) ((int)(f) - ( (int)(f) > (f) ))
| Floor function. More...
#define | hal_gfx_ceil(f) ((int)(f) + ( (int)(f) < (f) ))
| Ceiling function. More...

## Functions
float | hal_gfx_sin (float angle_degrees)
| Fast sine approximation of a given angle. More...
float | hal_gfx_cos (float angle_degrees)
| Fast cosine approximation of a given angle. More...
float | hal_gfx_tan (float angle_degrees)
| Fast tangent approximation of a given angle. More...
float | hal_gfx_pow (float x, float y)
| A rough approximation of x raised to the power of y. More...
float | hal_gfx_sqrt (float x)
| A rough approximation of the square root of x. More...
float | hal_gfx_atan (float x)
| A floating-point approximation of the inverse tangent of x. More...
int | hal_gfx_f2fx (float f)
| Convert float to 16.16 fixed point. More...

## Detailed Description

Header file containing functions prototypes of Graphics library.

Author
  BLE Driver Team

Attention

  ##### Copyright (c) 2019 GOODIX

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Definition in file hal_gfx_math.h.