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74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/**
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* @file math_base.h
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*
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*/
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#ifndef LV_MATH_H
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#define LV_MATH_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*********************
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* INCLUDES
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*********************/
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#include <stdint.h>
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/*********************
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* DEFINES
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*********************/
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#define LV_MATH_MIN(a,b) ((a) < (b) ? (a) : (b))
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#define LV_MATH_MAX(a,b) ((a) > (b) ? (a) : (b))
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#define LV_MATH_ABS(x) ((x) > 0 ? (x) : (-(x)))
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#define LV_TRIGO_SIN_MAX 32767
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#define LV_TRIGO_SHIFT 15 /* >> LV_TRIGO_SHIFT to normalize*/
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#define LV_BEZIER_VAL_MAX 1024 /*Max time in Bezier functions (not [0..1] to use integers) */
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#define LV_BEZIER_VAL_SHIFT 10 /*log2(LV_BEZIER_VAL_MAX): used to normalize up scaled values*/
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* GLOBAL PROTOTYPES
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**********************/
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/**
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* Convert a number to string
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* @param num a number
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* @param buf pointer to a `char` buffer. The result will be stored here (max 10 elements)
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* @return same as `buf` (just for convenience)
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*/
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char * lv_math_num_to_str(int32_t num, char * buf);
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/**
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* Return with sinus of an angle
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* @param angle
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* @return sinus of 'angle'. sin(-90) = -32767, sin(90) = 32767
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*/
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int16_t lv_trigo_sin(int16_t angle);
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/**
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* Calculate a value of a Cubic Bezier function.
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* @param t time in range of [0..LV_BEZIER_VAL_MAX]
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* @param u0 start values in range of [0..LV_BEZIER_VAL_MAX]
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* @param u1 control value 1 values in range of [0..LV_BEZIER_VAL_MAX]
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* @param u2 control value 2 in range of [0..LV_BEZIER_VAL_MAX]
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* @param u3 end values in range of [0..LV_BEZIER_VAL_MAX]
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* @return the value calculated from the given parameters in range of [0..LV_BEZIER_VAL_MAX]
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*/
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int32_t lv_bezier3(uint32_t t, int32_t u0, int32_t u1, int32_t u2, int32_t u3);
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/**********************
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* MACROS
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**********************/
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif
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