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https://github.com/lvgl/lvgl.git
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146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/**
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* @file lv_math.c
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*
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*/
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/*********************
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* INCLUDES
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*********************/
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#include "lv_math.h"
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#include <stdbool.h>
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/*********************
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* DEFINES
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*********************/
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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/**********************
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* STATIC VARIABLES
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**********************/
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static int16_t sin0_90_table[] = {
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0, 572, 1144, 1715, 2286, 2856, 3425, 3993, 4560, 5126,
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5690, 6252, 6813, 7371, 7927, 8481, 9032, 9580, 10126, 10668,
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11207, 11743, 12275, 12803, 13328, 13848, 14364, 14876, 15383, 15886,
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16383, 16876, 17364, 17846, 18323, 18794, 19260, 19720, 20173, 20621,
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21062, 21497, 21925, 22347, 22762, 23170, 23571, 23964, 24351, 24730,
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25101, 25465, 25821, 26169, 26509, 26841, 27165, 27481, 27788, 28087,
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28377, 28659, 28932, 29196, 29451, 29697, 29934, 30162, 30381, 30591,
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30791, 30982, 31163, 31335, 31498, 31650, 31794, 31927, 32051, 32165,
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32269, 32364, 32448, 32523, 32587, 32642, 32687, 32722, 32747, 32762,
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32767
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};
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/**********************
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* MACROS
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**********************/
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/**********************
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* GLOBAL FUNCTIONS
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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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if (num == 0) {
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buf[0] = '0';
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buf[1] = '\0';
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return buf;
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}
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int8_t digitCount = 0;
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int8_t i = 0;
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if (num < 0) {
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buf[digitCount++] = '-';
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num = abs(num);
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++i;
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}
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while (num) {
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char digit = num % 10;
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buf[digitCount++] = digit + 48;
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num /= 10;
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}
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buf[digitCount] = '\0';
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digitCount--;
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while (digitCount > i) {
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char temp = buf[i];
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buf[i] = buf[digitCount];
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buf[digitCount] = temp;
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digitCount--;
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i++;
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}
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return buf;
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}
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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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int16_t ret = 0;
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angle = angle % 360;
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if(angle < 0) angle = 360 + angle;
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if(angle < 90) {
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ret = sin0_90_table[angle];
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} else if(angle >= 90 && angle < 180) {
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angle = 180 - angle;
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ret = sin0_90_table[angle];
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} else if(angle >= 180 && angle < 270) {
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angle = angle - 180;
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ret = - sin0_90_table[angle];
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} else { /*angle >=270*/
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angle = 360 - angle;
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ret = - sin0_90_table[angle];
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}
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return ret;
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}
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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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uint32_t t_rem = 1024 - t;
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uint32_t t_rem2 = (t_rem * t_rem) >> 10;
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uint32_t t_rem3 = (t_rem2 * t_rem) >> 10;
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uint32_t t2 = (t * t) >> 10;
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uint32_t t3 = (t2 * t) >> 10;
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uint32_t v1 = ((uint32_t)t_rem3 * u0) >> 10;
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uint32_t v2 = ((uint32_t)3 * t_rem2 * t * u1) >> 20;
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uint32_t v3 = ((uint32_t)3 * t_rem * t2 * u2) >> 20;
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uint32_t v4 = ((uint32_t)t3 * u3) >> 10;
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return v1 + v2 + v3 + v4;
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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