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lvgl/src/lv_widgets/lv_chart.c
Gabor Kiss-Vamosi ee6c5e3399 run code formatter
2020-05-18 16:57:23 +02:00

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/**
* @file lv_chart.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_chart.h"
#if LV_USE_CHART != 0
#include "../lv_core/lv_debug.h"
#include "../lv_core/lv_refr.h"
#include "../lv_draw/lv_draw.h"
#include "../lv_misc/lv_math.h"
#include "../lv_themes/lv_theme.h"
/*********************
* DEFINES
*********************/
#define LV_OBJX_NAME "lv_chart"
#define LV_CHART_YMIN_DEF 0
#define LV_CHART_YMAX_DEF 100
#define LV_CHART_HDIV_DEF 3
#define LV_CHART_VDIV_DEF 5
#define LV_CHART_PNUM_DEF 10
#define LV_CHART_AXIS_MAJOR_TICK_LEN_COE 1 / 15
#define LV_CHART_AXIS_MINOR_TICK_LEN_COE 2 / 3
#define LV_CHART_AXIS_PRIMARY_Y 1
#define LV_CHART_AXIS_SECONDARY_Y 0
#define LV_CHART_LABEL_ITERATOR_FORWARD 1
#define LV_CHART_LABEL_ITERATOR_REVERSE 0
/**********************
* TYPEDEFS
**********************/
typedef struct {
const char * list_start;
const char * current_pos;
uint8_t items_left;
uint8_t is_reverse_iter;
} lv_chart_label_iterator_t;
/**********************
* STATIC PROTOTYPES
**********************/
static lv_design_res_t lv_chart_design(lv_obj_t * chart, const lv_area_t * clip_area, lv_design_mode_t mode);
static lv_res_t lv_chart_signal(lv_obj_t * chart, lv_signal_t sign, void * param);
static lv_style_list_t * lv_chart_get_style(lv_obj_t * chart, uint8_t part);
static void draw_series_bg(lv_obj_t * chart, const lv_area_t * series_area, const lv_area_t * mask);
static void draw_series_line(lv_obj_t * chart, const lv_area_t * series_area, const lv_area_t * clip_area);
static void draw_series_column(lv_obj_t * chart, const lv_area_t * series_area, const lv_area_t * clip_area);
static void draw_axes(lv_obj_t * chart, const lv_area_t * series_area, const lv_area_t * mask);
static void invalidate_lines(lv_obj_t * chart, uint16_t i);
static void invalidate_columns(lv_obj_t * chart, uint16_t i);
static void get_series_area(lv_obj_t * chart, lv_area_t * series_area);
static void get_next_axis_label(lv_chart_label_iterator_t * iterator, char * buf);
static inline bool is_tick_with_label(uint8_t tick_num, lv_chart_axis_cfg_t * axis);
static lv_chart_label_iterator_t create_axis_label_iter(const char * list, uint8_t iterator_dir);
/**********************
* STATIC VARIABLES
**********************/
static lv_design_cb_t ancestor_design;
static lv_signal_cb_t ancestor_signal;
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Create a chart background objects
* @param par pointer to an object, it will be the parent of the new chart background
* @param copy pointer to a chart background object, if not NULL then the new object will be copied
* from it
* @return pointer to the created chart background
*/
lv_obj_t * lv_chart_create(lv_obj_t * par, const lv_obj_t * copy)
{
LV_LOG_TRACE("chart create started");
/*Create the ancestor basic object*/
lv_obj_t * chart = lv_obj_create(par, copy);
LV_ASSERT_MEM(chart);
if(chart == NULL) return NULL;
/*Allocate the object type specific extended data*/
lv_chart_ext_t * ext = lv_obj_allocate_ext_attr(chart, sizeof(lv_chart_ext_t));
LV_ASSERT_MEM(ext);
if(ext == NULL) {
lv_obj_del(chart);
return NULL;
}
_lv_ll_init(&ext->series_ll, sizeof(lv_chart_series_t));
ext->ymin = LV_CHART_YMIN_DEF;
ext->ymax = LV_CHART_YMAX_DEF;
ext->hdiv_cnt = LV_CHART_HDIV_DEF;
ext->vdiv_cnt = LV_CHART_VDIV_DEF;
ext->point_cnt = LV_CHART_PNUM_DEF;
ext->type = LV_CHART_TYPE_LINE;
ext->update_mode = LV_CHART_UPDATE_MODE_SHIFT;
_lv_memset_00(&ext->x_axis, sizeof(ext->x_axis));
_lv_memset_00(&ext->y_axis, sizeof(ext->y_axis));
_lv_memset_00(&ext->secondary_y_axis, sizeof(ext->secondary_y_axis));
ext->x_axis.major_tick_len = LV_CHART_TICK_LENGTH_AUTO;
ext->x_axis.minor_tick_len = LV_CHART_TICK_LENGTH_AUTO;
ext->y_axis.major_tick_len = LV_CHART_TICK_LENGTH_AUTO;
ext->y_axis.minor_tick_len = LV_CHART_TICK_LENGTH_AUTO;
ext->secondary_y_axis.major_tick_len = LV_CHART_TICK_LENGTH_AUTO;
ext->secondary_y_axis.minor_tick_len = LV_CHART_TICK_LENGTH_AUTO;
lv_style_list_init(&ext->style_series_bg);
lv_style_list_init(&ext->style_series);
if(ancestor_design == NULL) ancestor_design = lv_obj_get_design_cb(chart);
if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_cb(chart);
lv_obj_set_signal_cb(chart, lv_chart_signal);
lv_obj_set_design_cb(chart, lv_chart_design);
/*Init the new chart background object*/
if(copy == NULL) {
lv_obj_set_size(chart, LV_DPI * 3, LV_DPI * 2);
lv_theme_apply(chart, LV_THEME_CHART);
}
else {
lv_chart_ext_t * ext_copy = lv_obj_get_ext_attr(copy);
lv_style_list_copy(&ext->style_series, &ext_copy->style_series);
lv_style_list_copy(&ext->style_series_bg, &ext_copy->style_series_bg);
ext->type = ext_copy->type;
ext->ymin = ext_copy->ymin;
ext->ymax = ext_copy->ymax;
ext->hdiv_cnt = ext_copy->hdiv_cnt;
ext->vdiv_cnt = ext_copy->vdiv_cnt;
ext->point_cnt = ext_copy->point_cnt;
_lv_memcpy(&ext->x_axis, &ext_copy->x_axis, sizeof(lv_chart_axis_cfg_t));
_lv_memcpy(&ext->y_axis, &ext_copy->y_axis, sizeof(lv_chart_axis_cfg_t));
_lv_memcpy(&ext->secondary_y_axis, &ext_copy->secondary_y_axis, sizeof(lv_chart_axis_cfg_t));
/*Refresh the style with new signal function*/
lv_obj_refresh_style(chart, LV_STYLE_PROP_ALL);
}
LV_LOG_INFO("chart created");
return chart;
}
/*======================
* Add/remove functions
*=====================*/
/**
* Allocate and add a data series to the chart
* @param chart pointer to a chart object
* @param color color of the data series
* @return pointer to the allocated data series
*/
lv_chart_series_t * lv_chart_add_series(lv_obj_t * chart, lv_color_t color)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
lv_chart_series_t * ser = _lv_ll_ins_head(&ext->series_ll);
LV_ASSERT_MEM(ser);
if(ser == NULL) return NULL;
lv_coord_t def = LV_CHART_POINT_DEF;
ser->color = color;
ser->points = lv_mem_alloc(sizeof(lv_coord_t) * ext->point_cnt);
LV_ASSERT_MEM(ser->points);
if(ser->points == NULL) {
_lv_ll_remove(&ext->series_ll, ser);
lv_mem_free(ser);
return NULL;
}
ser->start_point = 0;
uint16_t i;
lv_coord_t * p_tmp = ser->points;
for(i = 0; i < ext->point_cnt; i++) {
*p_tmp = def;
p_tmp++;
}
return ser;
}
/**
* Clear the point of a serie
* @param chart pointer to a chart object
* @param serie pointer to the chart's serie to clear
*/
void lv_chart_clear_serie(lv_obj_t * chart, lv_chart_series_t * serie)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
LV_ASSERT_NULL(serie);
if(chart == NULL || serie == NULL) return;
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(ext == NULL) return;
uint32_t i;
for(i = 0; i < ext->point_cnt; i++) {
serie->points[i] = LV_CHART_POINT_DEF;
}
serie->start_point = 0;
}
/*=====================
* Setter functions
*====================*/
/**
* Set the number of horizontal and vertical division lines
* @param chart pointer to a graph background object
* @param hdiv number of horizontal division lines
* @param vdiv number of vertical division lines
*/
void lv_chart_set_div_line_count(lv_obj_t * chart, uint8_t hdiv, uint8_t vdiv)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(ext->hdiv_cnt == hdiv && ext->vdiv_cnt == vdiv) return;
ext->hdiv_cnt = hdiv;
ext->vdiv_cnt = vdiv;
lv_obj_invalidate(chart);
}
/**
* Set the minimal and maximal y values
* @param chart pointer to a graph background object
* @param ymin y minimum value
* @param ymax y maximum value
*/
void lv_chart_set_range(lv_obj_t * chart, lv_coord_t ymin, lv_coord_t ymax)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(ext->ymin == ymin && ext->ymax == ymax) return;
ext->ymin = ymin;
ext->ymax = ymax;
lv_chart_refresh(chart);
}
/**
* Set a new type for a chart
* @param chart pointer to a chart object
* @param type new type of the chart (from 'lv_chart_type_t' enum)
*/
void lv_chart_set_type(lv_obj_t * chart, lv_chart_type_t type)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(ext->type == type) return;
ext->type = type;
lv_chart_refresh(chart);
}
/**
* Set the number of points on a data line on a chart
* @param chart pointer r to chart object
* @param point_cnt new number of points on the data lines
*/
void lv_chart_set_point_count(lv_obj_t * chart, uint16_t point_cnt)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(ext->point_cnt == point_cnt) return;
lv_chart_series_t * ser;
uint16_t point_cnt_old = ext->point_cnt;
uint16_t i;
lv_coord_t def = LV_CHART_POINT_DEF;
if(point_cnt < 1) point_cnt = 1;
_LV_LL_READ_BACK(ext->series_ll, ser) {
if(ser->start_point != 0) {
lv_coord_t * new_points = lv_mem_alloc(sizeof(lv_coord_t) * point_cnt);
LV_ASSERT_MEM(new_points);
if(new_points == NULL) return;
if(point_cnt >= point_cnt_old) {
for(i = 0; i < point_cnt_old; i++) {
new_points[i] =
ser->points[(i + ser->start_point) % point_cnt_old]; /*Copy old contents to new array*/
}
for(i = point_cnt_old; i < point_cnt; i++) {
new_points[i] = def; /*Fill up the rest with default value*/
}
}
else {
for(i = 0; i < point_cnt; i++) {
new_points[i] =
ser->points[(i + ser->start_point) % point_cnt_old]; /*Copy old contents to new array*/
}
}
/*Switch over pointer from old to new*/
lv_mem_free(ser->points);
ser->points = new_points;
}
else {
ser->points = lv_mem_realloc(ser->points, sizeof(lv_coord_t) * point_cnt);
LV_ASSERT_MEM(ser->points);
if(ser->points == NULL) return;
/*Initialize the new points*/
if(point_cnt > point_cnt_old) {
for(i = point_cnt_old - 1; i < point_cnt; i++) {
ser->points[i] = def;
}
}
}
ser->start_point = 0;
}
ext->point_cnt = point_cnt;
lv_chart_refresh(chart);
}
/**
* Initialize all data points with a value
* @param chart pointer to chart object
* @param ser pointer to a data series on 'chart'
* @param y the new value for all points
*/
void lv_chart_init_points(lv_obj_t * chart, lv_chart_series_t * ser, lv_coord_t y)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
LV_ASSERT_NULL(ser);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
uint16_t i;
for(i = 0; i < ext->point_cnt; i++) {
ser->points[i] = y;
}
ser->start_point = 0;
lv_chart_refresh(chart);
}
/**
* Set the value of points from an array
* @param chart pointer to chart object
* @param ser pointer to a data series on 'chart'
* @param y_array array of 'lv_coord_t' points (with 'points count' elements )
*/
void lv_chart_set_points(lv_obj_t * chart, lv_chart_series_t * ser, lv_coord_t y_array[])
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
LV_ASSERT_NULL(ser);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
memcpy(ser->points, y_array, ext->point_cnt * (sizeof(lv_coord_t)));
ser->start_point = 0;
lv_chart_refresh(chart);
}
/**
* Shift all data left and set the rightmost data on a data line
* @param chart pointer to chart object
* @param ser pointer to a data series on 'chart'
* @param y the new value of the rightmost data
*/
void lv_chart_set_next(lv_obj_t * chart, lv_chart_series_t * ser, lv_coord_t y)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
LV_ASSERT_NULL(ser);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(ext->update_mode == LV_CHART_UPDATE_MODE_SHIFT) {
ser->points[ser->start_point] =
y; /*This was the place of the former left most value, after shifting it is the rightmost*/
ser->start_point = (ser->start_point + 1) % ext->point_cnt;
lv_chart_refresh(chart);
}
else if(ext->update_mode == LV_CHART_UPDATE_MODE_CIRCULAR) {
ser->points[ser->start_point] = y;
if(ext->type & LV_CHART_TYPE_LINE) invalidate_lines(chart, ser->start_point);
if(ext->type & LV_CHART_TYPE_COLUMN) invalidate_columns(chart, ser->start_point);
ser->start_point = (ser->start_point + 1) % ext->point_cnt; /*update the x for next incoming y*/
}
}
/**
* Set update mode of the chart object.
* @param chart pointer to a chart object
* @param update mode
*/
void lv_chart_set_update_mode(lv_obj_t * chart, lv_chart_update_mode_t update_mode)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(ext->update_mode == update_mode) return;
ext->update_mode = update_mode;
lv_obj_invalidate(chart);
}
/**
* Set the length of the tick marks on the x axis
* @param chart pointer to the chart
* @param major_tick_len the length of the major tick or `LV_CHART_TICK_LENGTH_AUTO` to set automatically
* (where labels are added)
* @param minor_tick_len the length of the minor tick, `LV_CHART_TICK_LENGTH_AUTO` to set automatically
* (where no labels are added)
*/
void lv_chart_set_x_tick_length(lv_obj_t * chart, uint8_t major_tick_len, uint8_t minor_tick_len)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
ext->x_axis.major_tick_len = major_tick_len;
ext->x_axis.minor_tick_len = minor_tick_len;
}
/**
* Set the length of the tick marks on the y axis
* @param chart pointer to the chart
* @param major_tick_len the length of the major tick or `LV_CHART_TICK_LENGTH_AUTO` to set automatically
* (where labels are added)
* @param minor_tick_len the length of the minor tick, `LV_CHART_TICK_LENGTH_AUTO` to set automatically
* (where no labels are added)
*/
void lv_chart_set_y_tick_length(lv_obj_t * chart, uint8_t major_tick_len, uint8_t minor_tick_len)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
ext->y_axis.major_tick_len = major_tick_len;
ext->y_axis.minor_tick_len = minor_tick_len;
}
/**
* Set the length of the tick marks on the secondary y axis
* @param chart pointer to the chart
* @param major_tick_len the length of the major tick or `LV_CHART_TICK_LENGTH_AUTO` to set automatically
* (where labels are added)
* @param minor_tick_len the length of the minor tick, `LV_CHART_TICK_LENGTH_AUTO` to set automatically
* (where no labels are added)
*/
void lv_chart_set_secondary_y_tick_length(lv_obj_t * chart, uint8_t major_tick_len, uint8_t minor_tick_len)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
ext->secondary_y_axis.major_tick_len = major_tick_len;
ext->secondary_y_axis.minor_tick_len = minor_tick_len;
}
/**
* Set the x-axis tick count and labels of a chart
* @param chart pointer to a chart object
* @param list_of_values list of string values, terminated with \n, except the last
* @param num_tick_marks if list_of_values is NULL: total number of ticks per axis
* else number of ticks between two value labels
* @param options extra options
*/
void lv_chart_set_x_tick_texts(lv_obj_t * chart, const char * list_of_values, uint8_t num_tick_marks,
lv_chart_axis_options_t options)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
LV_ASSERT_NULL(list_of_values);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
ext->x_axis.num_tick_marks = num_tick_marks;
ext->x_axis.list_of_values = list_of_values;
ext->x_axis.options = options;
}
/**
* Set the y-axis tick count and labels of a chart
* @param chart pointer to a chart object
* @param list_of_values list of string values, terminated with \n, except the last
* @param num_tick_marks if list_of_values is NULL: total number of ticks per axis
* else number of ticks between two value labels
* @param options extra options
*/
void lv_chart_set_y_tick_texts(lv_obj_t * chart, const char * list_of_values, uint8_t num_tick_marks,
lv_chart_axis_options_t options)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
LV_ASSERT_NULL(list_of_values);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
ext->y_axis.num_tick_marks = num_tick_marks;
ext->y_axis.list_of_values = list_of_values;
ext->y_axis.options = options;
}
/**
* Set the secondary y-axis tick count and labels of a chart
* @param chart pointer to a chart object
* @param list_of_values list of string values, terminated with \n, except the last
* @param num_tick_marks if list_of_values is NULL: total number of ticks per axis
* else number of ticks between two value labels
* @param options extra options
*/
void lv_chart_set_secondary_y_tick_texts(lv_obj_t * chart, const char * list_of_values, uint8_t num_tick_marks,
lv_chart_axis_options_t options)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
LV_ASSERT_NULL(list_of_values);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
ext->secondary_y_axis.num_tick_marks = num_tick_marks;
ext->secondary_y_axis.list_of_values = list_of_values;
ext->secondary_y_axis.options = options;
}
/*=====================
* Getter functions
*====================*/
/**
* Get the type of a chart
* @param chart pointer to chart object
* @return type of the chart (from 'lv_chart_t' enum)
*/
lv_chart_type_t lv_chart_get_type(const lv_obj_t * chart)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
return ext->type;
}
/**
* Get the data point number per data line on chart
* @param chart pointer to chart object
* @return point number on each data line
*/
uint16_t lv_chart_get_point_count(const lv_obj_t * chart)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
return ext->point_cnt;
}
/*=====================
* Other functions
*====================*/
/**
* Refresh a chart if its data line has changed
* @param chart pointer to chart object
*/
void lv_chart_refresh(lv_obj_t * chart)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_obj_invalidate(chart);
}
/**********************
* STATIC FUNCTIONS
**********************/
/**
* Handle the drawing related tasks of the chart backgrounds
* @param chart pointer to an object
* @param clip_area the object will be drawn only in this area
* @param mode LV_DESIGN_COVER_CHK: only check if the object fully covers the 'mask_p' area
* (return 'true' if yes)
* LV_DESIGN_DRAW: draw the object (always return 'true')
* LV_DESIGN_DRAW_POST: drawing after every children are drawn
* @param return an element of `lv_design_res_t`
*/
static lv_design_res_t lv_chart_design(lv_obj_t * chart, const lv_area_t * clip_area, lv_design_mode_t mode)
{
if(mode == LV_DESIGN_COVER_CHK) {
return ancestor_design(chart, clip_area, mode);
}
else if(mode == LV_DESIGN_DRAW_MAIN) {
/*Draw the background*/
lv_draw_rect_dsc_t bg_dsc;
lv_draw_rect_dsc_init(&bg_dsc);
lv_obj_init_draw_rect_dsc(chart, LV_CHART_PART_BG, &bg_dsc);
lv_draw_rect(&chart->coords, clip_area, &bg_dsc);
lv_area_t series_area;
get_series_area(chart, &series_area);
draw_series_bg(chart, &series_area, clip_area);
draw_axes(chart, &series_area, clip_area);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(ext->type & LV_CHART_TYPE_LINE) draw_series_line(chart, &series_area, clip_area);
if(ext->type & LV_CHART_TYPE_COLUMN) draw_series_column(chart, &series_area, clip_area);
}
return LV_DESIGN_RES_OK;
}
/**
* Signal function of the chart background
* @param chart pointer to a chart background object
* @param sign a signal type from lv_signal_t enum
* @param param pointer to a signal specific variable
*/
static lv_res_t lv_chart_signal(lv_obj_t * chart, lv_signal_t sign, void * param)
{
/* Include the ancient signal function */
lv_res_t res;
if(sign == LV_SIGNAL_GET_STYLE) {
lv_get_style_info_t * info = param;
info->result = lv_chart_get_style(chart, info->part);
if(info->result != NULL) return LV_RES_OK;
else return ancestor_signal(chart, sign, param);
}
res = ancestor_signal(chart, sign, param);
if(res != LV_RES_OK) return res;
if(sign == LV_SIGNAL_GET_TYPE) return lv_obj_handle_get_type_signal(param, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(sign == LV_SIGNAL_CLEANUP) {
lv_coord_t ** datal;
_LV_LL_READ(ext->series_ll, datal) {
lv_mem_free(*datal);
}
_lv_ll_clear(&ext->series_ll);
lv_obj_clean_style_list(chart, LV_CHART_PART_SERIES);
lv_obj_clean_style_list(chart, LV_CHART_PART_SERIES_BG);
}
return res;
}
/**
* Get the style descriptor of a part of the object
* @param chart pointer the object
* @param part the part of the chart. (LV_CHART_PART_...)
* @return pointer to the style descriptor of the specified part
*/
static lv_style_list_t * lv_chart_get_style(lv_obj_t * chart, uint8_t part)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
lv_style_list_t * style_dsc_p;
switch(part) {
case LV_CHART_PART_BG:
style_dsc_p = &chart->style_list;
break;
case LV_CHART_PART_SERIES_BG:
style_dsc_p = &ext->style_series_bg;
break;
case LV_CHART_PART_SERIES:
style_dsc_p = &ext->style_series;
break;
default:
style_dsc_p = NULL;
}
return style_dsc_p;
}
/**
* Draw the division lines on chart background
* @param chart pointer to chart object
* @param clip_area mask, inherited from the design function
*/
static void draw_series_bg(lv_obj_t * chart, const lv_area_t * series_area, const lv_area_t * clip_area)
{
/*Draw the background of the series*/
lv_draw_rect_dsc_t bg_dsc;
lv_draw_rect_dsc_init(&bg_dsc);
lv_obj_init_draw_rect_dsc(chart, LV_CHART_PART_SERIES_BG, &bg_dsc);
lv_draw_rect(series_area, clip_area, &bg_dsc);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
uint8_t div_i;
uint8_t div_i_end;
uint8_t div_i_start;
lv_point_t p1;
lv_point_t p2;
lv_coord_t w = lv_area_get_width(series_area);
lv_coord_t h = lv_area_get_height(series_area);
lv_coord_t x_ofs = series_area->x1;
lv_coord_t y_ofs = series_area->y1;
lv_draw_line_dsc_t line_dsc;
lv_draw_line_dsc_init(&line_dsc);
lv_obj_init_draw_line_dsc(chart, LV_CHART_PART_SERIES_BG, &line_dsc);
if(ext->hdiv_cnt != 0) {
/*Draw side lines if no border*/
if(bg_dsc.border_width != 0) {
div_i_start = 1;
div_i_end = ext->hdiv_cnt;
}
else {
div_i_start = 0;
div_i_end = ext->hdiv_cnt + 1;
}
p1.x = 0 + x_ofs;
p2.x = w - 1 + x_ofs;
for(div_i = div_i_start; div_i <= div_i_end; div_i++) {
p1.y = (int32_t)((int32_t)(h - line_dsc.width) * div_i) / (ext->hdiv_cnt + 1);
p1.y += y_ofs;
p2.y = p1.y;
lv_draw_line(&p1, &p2, clip_area, &line_dsc);
}
}
if(ext->vdiv_cnt != 0) {
/*Draw side lines if no border*/
if(bg_dsc.border_width != 0) {
div_i_start = 1;
div_i_end = ext->vdiv_cnt;
}
else {
div_i_start = 0;
div_i_end = ext->vdiv_cnt + 1;
}
p1.y = 0 + y_ofs;
p2.y = h + y_ofs - 1;
for(div_i = div_i_start; div_i <= div_i_end; div_i++) {
p1.x = (int32_t)((int32_t)(w - line_dsc.width) * div_i) / (ext->vdiv_cnt + 1);
p1.x += x_ofs;
p2.x = p1.x;
lv_draw_line(&p1, &p2, clip_area, &line_dsc);
}
}
}
/**
* Draw the data lines as lines on a chart
* @param obj pointer to chart object
*/
static void draw_series_line(lv_obj_t * chart, const lv_area_t * series_area, const lv_area_t * clip_area)
{
lv_area_t com_area;
if(_lv_area_intersect(&com_area, series_area, clip_area) == false) return;
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
uint16_t i;
lv_point_t p1;
lv_point_t p2;
lv_coord_t w = lv_area_get_width(series_area);
lv_coord_t h = lv_area_get_height(series_area);
lv_coord_t x_ofs = series_area->x1;
lv_coord_t y_ofs = series_area->y1;
lv_chart_series_t * ser;
lv_area_t series_mask;
bool mask_ret = _lv_area_intersect(&series_mask, series_area, clip_area);
if(mask_ret == false) return;
lv_draw_line_dsc_t line_dsc;
lv_draw_line_dsc_init(&line_dsc);
lv_obj_init_draw_line_dsc(chart, LV_CHART_PART_SERIES, &line_dsc);
lv_draw_mask_fade_param_t mask_fade_p;
int16_t mask_fade_id = LV_MASK_ID_INV;
lv_draw_rect_dsc_t area_dsc;
bool has_area = lv_obj_get_style_bg_opa(chart, LV_CHART_PART_SERIES) > LV_OPA_MIN ? true : false;
bool has_fade = false;
if(has_area) {
lv_draw_rect_dsc_init(&area_dsc);
lv_obj_init_draw_rect_dsc(chart, LV_CHART_PART_SERIES, &area_dsc);
area_dsc.border_width = 0;
has_fade = area_dsc.bg_grad_dir == LV_GRAD_DIR_VER ? true : false;
if(has_fade) {
lv_draw_mask_fade_init(&mask_fade_p, series_area, area_dsc.bg_main_color_stop, series_area->y1,
area_dsc.bg_grad_color_stop, series_area->y2);
}
}
lv_draw_rect_dsc_t point_dsc;
lv_draw_rect_dsc_init(&point_dsc);
point_dsc.bg_opa = line_dsc.opa;
point_dsc.radius = LV_RADIUS_CIRCLE;
lv_coord_t point_radius = lv_obj_get_style_size(chart, LV_CHART_PART_SERIES);
/*Do not bother with line ending is the point will over it*/
if(point_radius > line_dsc.width / 2) line_dsc.raw_end = 1;
/*Go through all data lines*/
_LV_LL_READ_BACK(ext->series_ll, ser) {
line_dsc.color = ser->color;
point_dsc.bg_color = ser->color;
area_dsc.bg_color = ser->color;
area_dsc.bg_grad_color = ser->color;
lv_coord_t start_point = ext->update_mode == LV_CHART_UPDATE_MODE_SHIFT ? ser->start_point : 0;
p1.x = 0 + x_ofs;
p2.x = 0 + x_ofs;
lv_coord_t p_act = start_point;
lv_coord_t p_prev = start_point;
int32_t y_tmp = (int32_t)((int32_t)ser->points[p_prev] - ext->ymin) * h;
y_tmp = y_tmp / (ext->ymax - ext->ymin);
p2.y = h - y_tmp + y_ofs;
for(i = 0; i < ext->point_cnt; i++) {
p1.x = p2.x;
p1.y = p2.y;
p2.x = ((w * i) / (ext->point_cnt - 1)) + x_ofs;
p_act = (start_point + i) % ext->point_cnt;
y_tmp = (int32_t)((int32_t)ser->points[p_act] - ext->ymin) * h;
y_tmp = y_tmp / (ext->ymax - ext->ymin);
p2.y = h - y_tmp + y_ofs;
/*Don't draw the first point. A second point is also required to draw the line*/
if(i != 0 && ser->points[p_prev] != LV_CHART_POINT_DEF && ser->points[p_act] != LV_CHART_POINT_DEF) {
lv_draw_line(&p1, &p2, &series_mask, &line_dsc);
lv_coord_t y_top = LV_MATH_MIN(p1.y, p2.y);
if(has_area && y_top <= clip_area->y2) {
int16_t mask_line_id;
lv_draw_mask_line_param_t mask_line_p;
lv_draw_mask_line_points_init(&mask_line_p, p1.x, p1.y, p2.x, p2.y, LV_DRAW_MASK_LINE_SIDE_BOTTOM);
mask_line_id = lv_draw_mask_add(&mask_line_p, NULL);
lv_area_t a;
a.x1 = p1.x;
a.x2 = p2.x - 1;
a.y1 = y_top;
a.y2 = series_area->y2;
if(has_fade) mask_fade_id = lv_draw_mask_add(&mask_fade_p, NULL);
lv_draw_rect(&a, &series_mask, &area_dsc);
lv_draw_mask_remove_id(mask_line_id);
lv_draw_mask_remove_id(mask_fade_id);
}
}
if(point_radius) {
lv_area_t point_area;
point_area.x1 = p1.x;
point_area.x2 = point_area.x1 + point_radius;
point_area.x1 -= point_radius;
point_area.y1 = p1.y;
point_area.y2 = point_area.y1 + point_radius;
point_area.y1 -= point_radius;
if(ser->points[p_act] != LV_CHART_POINT_DEF) {
/*Don't limit to `series_mask` to get full circles on the ends*/
lv_draw_rect(&point_area, clip_area, &point_dsc);
}
}
p_prev = p_act;
}
/*Draw the last point*/
if(point_radius) {
lv_area_t point_area;
point_area.x1 = p2.x;
point_area.x2 = point_area.x1 + point_radius;
point_area.x1 -= point_radius;
point_area.y1 = p2.y;
point_area.y2 = point_area.y1 + point_radius;
point_area.y1 -= point_radius;
if(ser->points[p_act] != LV_CHART_POINT_DEF) {
/*Don't limit to `series_mask` to get full circles on the ends*/
lv_draw_rect(&point_area, clip_area, &point_dsc);
}
}
}
}
/**
* Draw the data lines as columns on a chart
* @param chart pointer to chart object
* @param mask mask, inherited from the design function
*/
static void draw_series_column(lv_obj_t * chart, const lv_area_t * series_area, const lv_area_t * clip_area)
{
lv_area_t com_area;
if(_lv_area_intersect(&com_area, series_area, clip_area) == false) return;
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
uint16_t i;
lv_area_t col_a;
lv_coord_t w = lv_area_get_width(series_area);
lv_coord_t h = lv_area_get_height(series_area);
int32_t y_tmp;
lv_chart_series_t * ser;
lv_coord_t col_w = w / ((_lv_ll_get_len(&ext->series_ll) + 1) * ext->point_cnt); /* Suppose + 1 series as separator*/
lv_coord_t x_ofs = col_w / 2; /*Shift with a half col.*/
lv_style_int_t col_space = lv_obj_get_style_pad_inner(chart, LV_CHART_PART_SERIES);
lv_draw_rect_dsc_t col_dsc;
lv_draw_rect_dsc_init(&col_dsc);
lv_obj_init_draw_rect_dsc(chart, LV_CHART_PART_SERIES, &col_dsc);
col_dsc.bg_grad_dir = LV_GRAD_DIR_NONE;
col_dsc.bg_opa = LV_OPA_COVER;
/*Make the cols longer with `radius` to clip the rounding from the bottom*/
col_a.y2 = series_area->y2 + col_dsc.radius;
lv_area_t series_mask;
bool mask_ret = _lv_area_intersect(&series_mask, series_area, clip_area);
if(mask_ret == false) return;
/*Go through all points*/
for(i = 0; i < ext->point_cnt; i++) {
lv_coord_t x_act = (int32_t)((int32_t)w * i) / ext->point_cnt;
x_act += series_area->x1 + x_ofs;
/*Draw the current point of all data line*/
_LV_LL_READ_BACK(ext->series_ll, ser) {
lv_coord_t start_point = ext->update_mode == LV_CHART_UPDATE_MODE_SHIFT ? ser->start_point : 0;
col_a.x1 = x_act;
col_a.x2 = col_a.x1 + col_w - col_space;
x_act += col_w;
if(col_a.x2 < series_mask.x1) continue;
if(col_a.x1 > series_mask.x2) break;
col_dsc.bg_color = ser->color;
lv_coord_t p_act = (start_point + i) % ext->point_cnt;
y_tmp = (int32_t)((int32_t)ser->points[p_act] - ext->ymin) * h;
y_tmp = y_tmp / (ext->ymax - ext->ymin);
col_a.y1 = h - y_tmp + series_area->y1;
if(ser->points[p_act] != LV_CHART_POINT_DEF) {
lv_draw_rect(&col_a, &series_mask, &col_dsc);
}
}
}
}
/**
* Create iterator for newline-separated list
* @param list pointer to newline-separated labels list
* @param iterator_dir LV_CHART_ITERATOR_FORWARD or LV_CHART_LABEL_ITERATOR_REVERSE
* @return lv_chart_label_iterator_t
*/
static lv_chart_label_iterator_t create_axis_label_iter(const char * list, uint8_t iterator_dir)
{
lv_chart_label_iterator_t iterator = {0};
uint8_t j;
iterator.list_start = list;
/* count number of list items */
for(j = 0; list[j] != '\0'; j++) {
if(list[j] == '\n')
iterator.items_left++;
}
if(iterator_dir == LV_CHART_LABEL_ITERATOR_FORWARD) {
iterator.is_reverse_iter = 0;
iterator.current_pos = list;
}
else {
iterator.is_reverse_iter = 1;
// -1 to skip '\0' at the end of the string
iterator.current_pos = list + j - 1;
}
iterator.items_left++;
return iterator;
}
/**
* Get next label from iterator created by lv_chart_create_label_iter()
* @param iterator iterator to get label from
* @param[out] buf buffer to point next label to
*/
static void get_next_axis_label(lv_chart_label_iterator_t * iterator, char * buf)
{
uint32_t label_len = 0;
if(iterator->is_reverse_iter) {
const char * label_start;
/* count the length of the current label*/
while((*iterator->current_pos != '\n') &&
(iterator->current_pos != iterator->list_start)) {
iterator->current_pos--;
label_len++;
}
label_start = iterator->current_pos;
if(*iterator->current_pos == '\n') {
/* do not copy \n symbol, +1 to skip it*/
label_start++;
/* skip newline*/
iterator->current_pos--;
}
else {
/* it is last label in list (first one from the beginning )*/
label_len++;
}
/* do not allow output buffer overflow */
if(label_len > LV_CHART_AXIS_TICK_LABEL_MAX_LEN) {
label_len = LV_CHART_AXIS_TICK_LABEL_MAX_LEN;
}
strncpy(buf, label_start, label_len);
}
else {
/* search for tick string */
while(iterator->current_pos[label_len] != '\n' &&
iterator->current_pos[label_len] != '\0') {
/* do not overflow the buffer, but move to the end of the current label */
if(label_len < LV_CHART_AXIS_TICK_LABEL_MAX_LEN) {
buf[label_len] = iterator->current_pos[label_len];
label_len++;
}
else {
label_len++;
}
}
iterator->current_pos += label_len;
/* do not allow output buffer overflow */
if(label_len > LV_CHART_AXIS_TICK_LABEL_MAX_LEN) {
label_len = LV_CHART_AXIS_TICK_LABEL_MAX_LEN;
}
if(*iterator->current_pos == '\n') iterator->current_pos++;
}
/* terminate the string */
buf[label_len] = '\0';
}
/**
* Check whether there should be a label next to tick with given
* number
* @param tick_num number of the tick to check
* @param axis pointer to struct containing info on the axis
* @return true if label should be located next to current tick
*/
static inline bool is_tick_with_label(uint8_t tick_num, lv_chart_axis_cfg_t * axis)
{
return ((tick_num == 0) || ((tick_num % axis->num_tick_marks) == 0));
}
static void draw_y_ticks(lv_obj_t * chart, const lv_area_t * series_area, const lv_area_t * mask, uint8_t which_axis)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
lv_chart_axis_cfg_t * y_axis = (which_axis == LV_CHART_AXIS_PRIMARY_Y) ?
&ext->y_axis : &ext->secondary_y_axis;
if(y_axis->list_of_values == NULL && y_axis->num_tick_marks == 0) return;
uint8_t i;
uint8_t num_of_labels;
uint8_t num_scale_ticks;
int8_t major_tick_len, minor_tick_len;
uint8_t iter_dir;
lv_point_t p1;
lv_point_t p2;
lv_coord_t x_ofs;
lv_chart_label_iterator_t iter;
lv_coord_t y_ofs = series_area->y1;
lv_coord_t h = lv_area_get_height(series_area);
lv_coord_t w = lv_area_get_width(series_area);
char buf[LV_CHART_AXIS_TICK_LABEL_MAX_LEN + 1]; /* up to N symbols per label + null terminator */
/* chose correct side of the chart */
if(which_axis == LV_CHART_AXIS_PRIMARY_Y)
x_ofs = series_area->x1;
else
x_ofs = series_area->x2;
/* calculate the size of tick marks */
if(y_axis->major_tick_len == LV_CHART_TICK_LENGTH_AUTO)
major_tick_len = (int32_t)w * LV_CHART_AXIS_MAJOR_TICK_LEN_COE;
else
major_tick_len = y_axis->major_tick_len;
if(y_axis->minor_tick_len == LV_CHART_TICK_LENGTH_AUTO)
minor_tick_len = major_tick_len * LV_CHART_AXIS_MINOR_TICK_LEN_COE;
else
minor_tick_len = y_axis->minor_tick_len;
/* tick lines on secondary y axis are drawn in other direction*/
if(which_axis == LV_CHART_AXIS_SECONDARY_Y) {
major_tick_len *= -1;
minor_tick_len *= -1;
}
iter_dir = (y_axis->options & LV_CHART_AXIS_INVERSE_LABELS_ORDER) ? LV_CHART_LABEL_ITERATOR_REVERSE :
LV_CHART_LABEL_ITERATOR_FORWARD;
iter = create_axis_label_iter(y_axis->list_of_values, iter_dir);
/*determine the number of options */
num_of_labels = iter.items_left;
/* we can't have string labels without ticks step, set to 1 if not specified */
if(y_axis->num_tick_marks == 0) y_axis->num_tick_marks = 1;
/* calculate total number of ticks */
if(num_of_labels < 2)
num_scale_ticks = y_axis->num_tick_marks;
else
num_scale_ticks = (y_axis->num_tick_marks * (num_of_labels - 1));
lv_style_int_t label_dist = which_axis == LV_CHART_AXIS_PRIMARY_Y ?
lv_obj_get_style_pad_left(chart, LV_CHART_PART_SERIES_BG) : lv_obj_get_style_pad_right(chart, LV_CHART_PART_SERIES_BG);
lv_draw_line_dsc_t line_dsc;
lv_draw_line_dsc_init(&line_dsc);
lv_obj_init_draw_line_dsc(chart, LV_CHART_PART_BG, &line_dsc);
lv_draw_label_dsc_t label_dsc;
lv_draw_label_dsc_init(&label_dsc);
lv_obj_init_draw_label_dsc(chart, LV_CHART_PART_BG, &label_dsc);
for(i = 0; i < (num_scale_ticks + 1); i++) { /* one extra loop - it may not exist in the list, empty label */
/* draw a line at moving y position */
p2.y = p1.y =
y_ofs + (int32_t)((int32_t)(h - line_dsc.width) * i) / num_scale_ticks;
if(p2.y - label_dsc.font->line_height > mask->y2) return;
if(p2.y + label_dsc.font->line_height < mask->y1) {
get_next_axis_label(&iter, buf);
continue;
}
/* first point of the tick */
p1.x = x_ofs;
/* move extra pixel out of chart boundary */
if(which_axis == LV_CHART_AXIS_PRIMARY_Y)
p1.x--;
else
p1.x++;
/* second point of the tick */
if((num_of_labels != 0) && (i == 0 || i % y_axis->num_tick_marks == 0))
p2.x = p1.x - major_tick_len; /* major tick */
else
p2.x = p1.x - minor_tick_len; /* minor tick */
if(y_axis->options & LV_CHART_AXIS_INVERSE_LABELS_ORDER) {
/*if label order is inversed last tick have number 0*/
if(i != 0)
lv_draw_line(&p1, &p2, mask, &line_dsc);
else if((y_axis->options & LV_CHART_AXIS_DRAW_LAST_TICK) != 0)
lv_draw_line(&p1, &p2, mask, &line_dsc);
}
else {
if(i != num_scale_ticks)
lv_draw_line(&p1, &p2, mask, &line_dsc);
else if((y_axis->options & LV_CHART_AXIS_DRAW_LAST_TICK) != 0)
lv_draw_line(&p1, &p2, mask, &line_dsc);
}
/* draw values if available */
if(num_of_labels != 0) {
/* add text only to major tick */
if(is_tick_with_label(i, y_axis)) {
get_next_axis_label(&iter, buf);
/* reserve appropriate area */
lv_point_t size;
_lv_txt_get_size(&size, buf, label_dsc.font, label_dsc.letter_space, label_dsc.line_space,
LV_COORD_MAX, LV_TXT_FLAG_CENTER);
/* set the area at some distance of the major tick len left of the tick */
lv_area_t a = {.y1 = p2.y - size.y / 2, .y2 = p2.y + size.y / 2};
if(which_axis == LV_CHART_AXIS_PRIMARY_Y) {
a.x1 = p2.x - size.x - label_dist;
a.x2 = p2.x - label_dist;
}
else {
a.x1 = p2.x + label_dist;
a.x2 = p2.x + size.x + label_dist;
}
lv_draw_label(&a, mask, &label_dsc, buf, NULL);
}
}
}
}
static void draw_x_ticks(lv_obj_t * chart, const lv_area_t * series_area, const lv_area_t * mask)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(ext->x_axis.list_of_values == NULL && ext->x_axis.num_tick_marks == 0) return;
uint8_t i;
uint8_t num_of_labels;
uint8_t num_scale_ticks;
uint8_t major_tick_len, minor_tick_len;
lv_chart_label_iterator_t iter;
lv_point_t p1;
lv_point_t p2;
lv_coord_t x_ofs = series_area->x1;
lv_coord_t y_ofs = series_area->y1;
lv_coord_t h = lv_area_get_height(series_area);
lv_coord_t w = lv_area_get_width(series_area);
lv_style_int_t label_dist = lv_obj_get_style_pad_bottom(chart, LV_CHART_PART_SERIES_BG);
lv_draw_label_dsc_t label_dsc;
lv_draw_label_dsc_init(&label_dsc);
lv_obj_init_draw_label_dsc(chart, LV_CHART_PART_BG, &label_dsc);
if(h + y_ofs > mask->y2) return;
if(h + y_ofs + label_dsc.font->line_height + label_dist < mask->y1) return;
lv_draw_line_dsc_t line_dsc;
lv_draw_line_dsc_init(&line_dsc);
lv_obj_init_draw_line_dsc(chart, LV_CHART_PART_BG, &line_dsc);
/* The columns don't start at the most right position
* so change the width and offset accordingly. */
if(ext->type == LV_CHART_TYPE_COLUMN) {
uint32_t ser_num = _lv_ll_get_len(&ext->series_ll);
lv_coord_t col_w = w / ((ser_num + 1) * ext->point_cnt); /* Suppose + 1 series as separator*/
x_ofs += col_w / 2 + (col_w * (ser_num) / 2);
w -= col_w * ser_num + col_w;
}
char buf[LV_CHART_AXIS_TICK_LABEL_MAX_LEN + 1]; /* up to N symbols per label + null terminator */
/* calculate the size of tick marks */
if(ext->x_axis.major_tick_len == LV_CHART_TICK_LENGTH_AUTO)
major_tick_len = (int32_t)w * LV_CHART_AXIS_MAJOR_TICK_LEN_COE;
else
major_tick_len = ext->x_axis.major_tick_len;
if(ext->x_axis.minor_tick_len == LV_CHART_TICK_LENGTH_AUTO)
minor_tick_len = major_tick_len * LV_CHART_AXIS_MINOR_TICK_LEN_COE;
else
minor_tick_len = ext->x_axis.minor_tick_len;
/*determine the number of options */
iter = create_axis_label_iter(ext->x_axis.list_of_values, LV_CHART_LABEL_ITERATOR_FORWARD);
num_of_labels = iter.items_left;
/* we can't have string labels without ticks step, set to 1 if not specified */
if(ext->x_axis.num_tick_marks == 0) ext->x_axis.num_tick_marks = 1;
/* calculate total number of marks */
if(num_of_labels < 2)
num_scale_ticks = ext->x_axis.num_tick_marks;
else
num_scale_ticks = (ext->x_axis.num_tick_marks * (num_of_labels - 1));
for(i = 0; i < (num_scale_ticks + 1); i++) { /* one extra loop - it may not exist in the list, empty label */
/* first point of the tick */
p1.y = h + y_ofs;
/* second point of the tick */
if((num_of_labels != 0) && (i == 0 || i % ext->x_axis.num_tick_marks == 0))
p2.y = p1.y + major_tick_len; /* major tick */
else
p2.y = p1.y + minor_tick_len; /* minor tick */
/* draw a line at moving x position */
p2.x = p1.x = x_ofs + (int32_t)((int32_t)(w - line_dsc.width) * i) / num_scale_ticks;
if(i != num_scale_ticks)
lv_draw_line(&p1, &p2, mask, &line_dsc);
else if((ext->x_axis.options & LV_CHART_AXIS_DRAW_LAST_TICK) != 0)
lv_draw_line(&p1, &p2, mask, &line_dsc);
/* draw values if available */
if(num_of_labels != 0) {
/* add text only to major tick */
if(is_tick_with_label(i, &(ext->x_axis))) {
get_next_axis_label(&iter, buf);
/* reserve appropriate area */
lv_point_t size;
_lv_txt_get_size(&size, buf, label_dsc.font, label_dsc.letter_space, label_dsc.line_space,
LV_COORD_MAX, LV_TXT_FLAG_CENTER);
/* set the area at some distance of the major tick len under of the tick */
lv_area_t a = {(p2.x - size.x / 2), (p2.y + label_dist), (p2.x + size.x / 2),
(p2.y + size.y + label_dist)
};
lv_draw_label(&a, mask, &label_dsc, buf, NULL);
}
}
}
}
static void draw_axes(lv_obj_t * chart, const lv_area_t * series_area, const lv_area_t * mask)
{
draw_y_ticks(chart, series_area, mask, LV_CHART_AXIS_PRIMARY_Y);
draw_y_ticks(chart, series_area, mask, LV_CHART_AXIS_SECONDARY_Y);
draw_x_ticks(chart, series_area, mask);
}
/**
* invalid area of the new line data lines on a chart
* @param obj pointer to chart object
*/
static void invalidate_lines(lv_obj_t * chart, uint16_t i)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(i >= ext->point_cnt) return;
lv_area_t series_area;
get_series_area(chart, &series_area);
lv_coord_t w = lv_area_get_width(&series_area);
lv_coord_t x_ofs = series_area.x1;
lv_style_int_t line_width = lv_obj_get_style_line_width(chart, LV_CHART_PART_SERIES);
lv_style_int_t point_radius = lv_obj_get_style_size(chart, LV_CHART_PART_SERIES);
lv_area_t coords;
lv_area_copy(&coords, &series_area);
if(i < ext->point_cnt - 1) {
coords.x1 = ((w * i) / (ext->point_cnt - 1)) + x_ofs - line_width - point_radius;
coords.x2 = ((w * (i + 1)) / (ext->point_cnt - 1)) + x_ofs + line_width + point_radius;
lv_obj_invalidate_area(chart, &coords);
}
if(i > 0) {
coords.x1 = ((w * (i - 1)) / (ext->point_cnt - 1)) + x_ofs - line_width - point_radius;
coords.x2 = ((w * i) / (ext->point_cnt - 1)) + x_ofs + line_width + point_radius;
lv_obj_invalidate_area(chart, &coords);
}
}
/**
* invalid area of the new column data lines on a chart
* @param chart pointer to chart object
* @param mask mask, inherited from the design function
*/
static void invalidate_columns(lv_obj_t * chart, uint16_t i)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
lv_area_t series_area;
get_series_area(chart, &series_area);
lv_area_t col_a;
lv_coord_t w = lv_area_get_width(&series_area);
lv_coord_t col_w = w / ((_lv_ll_get_len(&ext->series_ll) + 1) * ext->point_cnt); /* Suppose + 1 series as separator*/
lv_coord_t x_ofs = col_w / 2; /*Shift with a half col.*/
lv_coord_t x_act;
x_act = (int32_t)((int32_t)w * i) / ext->point_cnt;
x_act += series_area.x1 + x_ofs;
lv_obj_get_coords(chart, &col_a);
col_a.x1 = x_act;
col_a.x2 = col_a.x1 + col_w;
_lv_inv_area(lv_obj_get_disp(chart), &col_a);
}
static void get_series_area(lv_obj_t * chart, lv_area_t * series_area)
{
lv_area_copy(series_area, &chart->coords);
series_area->x1 += lv_obj_get_style_pad_left(chart, LV_CHART_PART_BG);
series_area->x2 -= lv_obj_get_style_pad_right(chart, LV_CHART_PART_BG);
series_area->y1 += lv_obj_get_style_pad_top(chart, LV_CHART_PART_BG);
series_area->y2 -= lv_obj_get_style_pad_bottom(chart, LV_CHART_PART_BG);
}
#endif
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