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lvgl/src/lv_objx/lv_chart.c

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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_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_TO_LABEL_DISTANCE 4
#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 bool lv_chart_design(lv_obj_t * chart, const lv_area_t * mask, lv_design_mode_t mode);
static lv_res_t lv_chart_signal(lv_obj_t * chart, lv_signal_t sign, void * param);
static void lv_chart_draw_div(lv_obj_t * chart, const lv_area_t * mask);
static void lv_chart_draw_lines(lv_obj_t * chart, const lv_area_t * mask);
static void lv_chart_draw_points(lv_obj_t * chart, const lv_area_t * mask);
static void lv_chart_draw_cols(lv_obj_t * chart, const lv_area_t * mask);
static void lv_chart_draw_vertical_lines(lv_obj_t * chart, const lv_area_t * mask);
static void lv_chart_draw_areas(lv_obj_t * chart, const lv_area_t * mask);
static void lv_chart_draw_axes(lv_obj_t * chart, const lv_area_t * mask);
static void lv_chart_inv_lines(lv_obj_t * chart, uint16_t i);
static void lv_chart_inv_points(lv_obj_t * chart, uint16_t i);
static void lv_chart_inv_cols(lv_obj_t * chart, uint16_t i);
static void lv_chart_get_next_label(lv_chart_label_iterator_t * iterator, char * buf);
static inline bool lv_chart_is_tick_with_label(uint8_t tick_num, lv_chart_axis_cfg_t * axis);
static lv_chart_label_iterator_t lv_chart_create_label_iter(const char * list, uint8_t iterator_dir);
/**********************
* STATIC VARIABLES
**********************/
static lv_design_cb_t ancestor_design_f;
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 * new_chart = lv_obj_create(par, copy);
LV_ASSERT_MEM(new_chart);
if(new_chart == NULL) return NULL;
/*Allocate the object type specific extended data*/
lv_chart_ext_t * ext = lv_obj_allocate_ext_attr(new_chart, sizeof(lv_chart_ext_t));
LV_ASSERT_MEM(ext);
if(ext == NULL) return NULL;
lv_ll_init(&ext->series_ll, sizeof(lv_chart_series_t));
ext->series.num = 0;
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;
ext->series.opa = LV_OPA_COVER;
ext->series.dark = LV_OPA_50;
ext->series.width = 2;
ext->margin = 0;
memset(&ext->x_axis, 0, sizeof(ext->x_axis));
memset(&ext->y_axis, 0, sizeof(ext->y_axis));
memset(&ext->secondary_y_axis, 0, 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;
if(ancestor_design_f == NULL) ancestor_design_f = lv_obj_get_design_cb(new_chart);
if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_cb(new_chart);
lv_obj_set_signal_cb(new_chart, lv_chart_signal);
lv_obj_set_design_cb(new_chart, lv_chart_design);
/*Init the new chart background object*/
if(copy == NULL) {
lv_obj_set_size(new_chart, LV_DPI * 3, LV_DPI * 2);
/*Set the default styles*/
lv_theme_t * th = lv_theme_get_current();
if(th) {
lv_chart_set_style(new_chart, LV_CHART_STYLE_MAIN, th->style.chart);
} else {
lv_chart_set_style(new_chart, LV_CHART_STYLE_MAIN, &lv_style_pretty);
}
} else {
lv_chart_ext_t * ext_copy = lv_obj_get_ext_attr(copy);
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;
ext->series.opa = ext_copy->series.opa;
ext->margin = ext_copy->margin;
memcpy(&ext->x_axis, &ext_copy->x_axis, sizeof(lv_chart_axis_cfg_t));
memcpy(&ext->y_axis, &ext_copy->y_axis, sizeof(lv_chart_axis_cfg_t));
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(new_chart);
}
LV_LOG_INFO("chart created");
return new_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;
if(ser == NULL) return NULL;
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_rem(&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++;
}
ext->series.num++;
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);
}
/**
* Set the opacity of the data series
* @param chart pointer to a chart object
* @param opa opacity of the data series
*/
void lv_chart_set_series_opa(lv_obj_t * chart, lv_opa_t opa)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(ext->series.opa == opa) return;
ext->series.opa = opa;
lv_obj_invalidate(chart);
}
/**
* Set the line width or point radius of the data series
* @param chart pointer to a chart object
* @param width the new width
*/
void lv_chart_set_series_width(lv_obj_t * chart, lv_coord_t width)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(ext->series.width == width) return;
ext->series.width = width;
lv_obj_invalidate(chart);
}
/**
* Set the dark effect on the bottom of the points or columns
* @param chart pointer to a chart object
* @param dark_eff dark effect level (LV_OPA_TRANSP to turn off)
*/
void lv_chart_set_series_darking(lv_obj_t * chart, lv_opa_t dark_eff)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if(ext->series.dark == dark_eff) return;
ext->series.dark = dark_eff;
lv_obj_invalidate(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) lv_chart_inv_lines(chart, ser->start_point);
if(ext->type & LV_CHART_TYPE_COLUMN) lv_chart_inv_cols(chart, ser->start_point);
if(ext->type & LV_CHART_TYPE_POINT) lv_chart_inv_points(chart, ser->start_point);
if(ext->type & LV_CHART_TYPE_VERTICAL_LINE) lv_chart_inv_lines(chart, ser->start_point);
if(ext->type & LV_CHART_TYPE_AREA) lv_chart_inv_lines(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;
}
/**
* Set the margin around the chart, used for axes value and ticks
* @param chart pointer to an chart object
* @param margin value of the margin [px]
*/
void lv_chart_set_margin(lv_obj_t * chart, uint16_t margin)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
ext->margin = margin;
lv_obj_refresh_ext_draw_pad(chart);
}
/*=====================
* 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_cnt(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;
}
/**
* Get the opacity of the data series
* @param chart pointer to chart object
* @return the opacity of the data series
*/
lv_opa_t lv_chart_get_series_opa(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->series.opa;
}
/**
* Get the data series width
* @param chart pointer to chart object
* @return the width the data series (lines or points)
*/
lv_coord_t lv_chart_get_series_width(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->series.width;
}
/**
* Get the dark effect level on the bottom of the points or columns
* @param chart pointer to chart object
* @return dark effect level (LV_OPA_TRANSP to turn off)
*/
lv_opa_t lv_chart_get_series_darking(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->series.dark;
}
/*=====================
* 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);
}
/**
* Get the margin around the chart, used for axes value and labels
* @param chart pointer to an chart object
* @param return value of the margin
*/
uint16_t lv_chart_get_margin(lv_obj_t * chart)
{
LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
return ext->margin;
}
/**********************
* STATIC FUNCTIONS
**********************/
/**
* Handle the drawing related tasks of the chart backgrounds
* @param chart pointer to an object
* @param mask 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 true/false, depends on 'mode'
*/
static bool lv_chart_design(lv_obj_t * chart, const lv_area_t * mask, lv_design_mode_t mode)
{
if(mode == LV_DESIGN_COVER_CHK) {
/*Return false if the object is not covers the mask_p area*/
return ancestor_design_f(chart, mask, mode);
} else if(mode == LV_DESIGN_DRAW_MAIN) {
/*Draw the background*/
lv_draw_rect(&chart->coords, mask, lv_obj_get_style(chart), lv_obj_get_opa_scale(chart));
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
lv_chart_draw_div(chart, mask);
/* Adjust the mask to remove the margin (clips chart contents to be within background) */
lv_area_t mask_tmp, adjusted_mask;
lv_obj_get_coords(chart, &mask_tmp);
bool union_ok = lv_area_intersect(&adjusted_mask, mask, &mask_tmp);
if(union_ok) {
if(ext->type & LV_CHART_TYPE_LINE) lv_chart_draw_lines(chart, &adjusted_mask);
if(ext->type & LV_CHART_TYPE_COLUMN) lv_chart_draw_cols(chart, &adjusted_mask);
if(ext->type & LV_CHART_TYPE_POINT) lv_chart_draw_points(chart, &adjusted_mask);
if(ext->type & LV_CHART_TYPE_VERTICAL_LINE) lv_chart_draw_vertical_lines(chart, &adjusted_mask);
if(ext->type & LV_CHART_TYPE_AREA) lv_chart_draw_areas(chart, &adjusted_mask);
}
lv_chart_draw_axes(chart, mask);
}
return true;
}
/**
* 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;
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);
} else if(sign == LV_SIGNAL_REFR_EXT_DRAW_PAD) {
/*Provide extra px draw area around the chart*/
chart->ext_draw_pad = ext->margin;
}
return res;
}
/**
* Draw the division lines on chart background
* @param chart pointer to chart object
* @param mask mask, inherited from the design function
*/
static void lv_chart_draw_div(lv_obj_t * chart, const lv_area_t * mask)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
const lv_style_t * style = lv_obj_get_style(chart);
lv_opa_t opa_scale = lv_obj_get_opa_scale(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_obj_get_width(chart);
lv_coord_t h = lv_obj_get_height(chart);
lv_coord_t x_ofs = chart->coords.x1;
lv_coord_t y_ofs = chart->coords.y1;
if(ext->hdiv_cnt != 0) {
/*Draw side lines if no border*/
if(style->body.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 - style->line.width) * div_i) / (ext->hdiv_cnt + 1);
p1.y += y_ofs;
p2.y = p1.y;
lv_draw_line(&p1, &p2, mask, style, opa_scale);
}
}
if(ext->vdiv_cnt != 0) {
/*Draw side lines if no border*/
if(style->body.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 - style->line.width) * div_i) / (ext->vdiv_cnt + 1);
p1.x += x_ofs;
p2.x = p1.x;
lv_draw_line(&p1, &p2, mask, style, opa_scale);
}
}
}
/**
* Draw the data lines as lines on a chart
* @param obj pointer to chart object
*/
static void lv_chart_draw_lines(lv_obj_t * chart, const lv_area_t * mask)
{
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_obj_get_width(chart);
lv_coord_t h = lv_obj_get_height(chart);
lv_coord_t x_ofs = chart->coords.x1;
lv_coord_t y_ofs = chart->coords.y1;
int32_t y_tmp;
lv_coord_t p_prev;
lv_coord_t p_act;
lv_chart_series_t * ser;
lv_opa_t opa_scale = lv_obj_get_opa_scale(chart);
lv_style_t style;
lv_style_copy(&style, &lv_style_plain);
style.line.opa = ext->series.opa;
style.line.width = ext->series.width;
/*Go through all data lines*/
LV_LL_READ_BACK(ext->series_ll, ser)
{
style.line.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;
p_prev = start_point;
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 = 1; 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;
if(ser->points[p_prev] != LV_CHART_POINT_DEF && ser->points[p_act] != LV_CHART_POINT_DEF)
lv_draw_line(&p1, &p2, mask, &style, opa_scale);
p_prev = p_act;
}
}
}
/**
* Draw the data lines as points on a chart
* @param chart pointer to chart object
* @param mask mask, inherited from the design function
*/
static void lv_chart_draw_points(lv_obj_t * chart, const lv_area_t * mask)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
uint16_t i;
lv_area_t cir_a;
lv_coord_t w = lv_obj_get_width(chart);
lv_coord_t h = lv_obj_get_height(chart);
lv_coord_t x_ofs = chart->coords.x1;
lv_coord_t y_ofs = chart->coords.y1;
int32_t y_tmp;
lv_coord_t p_act;
lv_chart_series_t * ser;
uint8_t series_cnt = 0;
lv_style_t style_point;
lv_style_copy(&style_point, &lv_style_plain);
style_point.body.border.width = 0;
style_point.body.radius = LV_RADIUS_CIRCLE;
style_point.body.opa = ext->series.opa;
style_point.body.radius = ext->series.width;
/*Go through all data lines*/
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;
style_point.body.main_color = ser->color;
style_point.body.grad_color = lv_color_mix(LV_COLOR_BLACK, ser->color, ext->series.dark);
for(i = 0; i < ext->point_cnt; i++) {
cir_a.x1 = ((w * i) / (ext->point_cnt - 1)) + x_ofs;
cir_a.x2 = cir_a.x1 + style_point.body.radius;
cir_a.x1 -= style_point.body.radius;
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);
cir_a.y1 = h - y_tmp + y_ofs - 1;
cir_a.y2 = cir_a.y1 + style_point.body.radius;
cir_a.y1 -= style_point.body.radius;
if(ser->points[p_act] != LV_CHART_POINT_DEF)
lv_draw_rect(&cir_a, mask, &style_point, lv_obj_get_opa_scale(chart));
}
series_cnt++;
}
}
/**
* 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 lv_chart_draw_cols(lv_obj_t * chart, const lv_area_t * mask)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
uint16_t i;
lv_area_t col_a;
lv_area_t col_mask;
bool mask_ret;
lv_coord_t w = lv_obj_get_width(chart);
lv_coord_t h = lv_obj_get_height(chart);
int32_t y_tmp;
lv_chart_series_t * ser;
lv_style_t rects;
lv_coord_t col_w = w / ((ext->series.num + 1) * ext->point_cnt); /* Suppose + 1 series as separator*/
lv_coord_t x_ofs = col_w / 2; /*Shift with a half col.*/
lv_style_copy(&rects, &lv_style_plain);
rects.body.border.width = 0;
rects.body.radius = 0;
rects.body.opa = ext->series.opa;
col_a.y2 = chart->coords.y2;
lv_coord_t x_act;
/*Go through all points*/
for(i = 0; i < ext->point_cnt; i++) {
x_act = (int32_t)((int32_t)w * i) / ext->point_cnt;
x_act += chart->coords.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;
x_act += col_w;
if(col_a.x2 < mask->x1) continue;
if(col_a.x1 > mask->x2) break;
rects.body.main_color = ser->color;
rects.body.grad_color = lv_color_mix(LV_COLOR_BLACK, ser->color, ext->series.dark);
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 + chart->coords.y1;
mask_ret = lv_area_intersect(&col_mask, mask, &col_a);
if(mask_ret != false && ser->points[p_act] != LV_CHART_POINT_DEF) {
lv_draw_rect(&chart->coords, &col_mask, &rects, lv_obj_get_opa_scale(chart));
}
}
}
}
/**
* Draw the data lines as vertical lines on a chart if there is only 1px between point
* @param obj pointer to chart object
*/
static void lv_chart_draw_vertical_lines(lv_obj_t * chart, const lv_area_t * mask)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
lv_coord_t w = lv_obj_get_width(chart);
/*Vertical lines works only if the width == point count. Else use the normal line type*/
if(ext->point_cnt != w) {
lv_chart_draw_lines(chart, mask);
return;
}
uint16_t i;
lv_point_t p1;
lv_point_t p2;
lv_coord_t p_act;
lv_coord_t h = lv_obj_get_height(chart);
lv_coord_t x_ofs = chart->coords.x1;
lv_coord_t y_ofs = chart->coords.y1;
int32_t y_tmp;
lv_chart_series_t * ser;
lv_opa_t opa_scale = lv_obj_get_opa_scale(chart);
lv_style_t style;
lv_style_copy(&style, &lv_style_plain);
style.line.opa = ext->series.opa;
style.line.width = ext->series.width;
/*Go through all data lines*/
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;
style.line.color = ser->color;
p1.x = 0 + x_ofs;
p2.x = 0 + x_ofs;
y_tmp = (int32_t)((int32_t)ser->points[0] - ext->ymin) * h;
y_tmp = y_tmp / (ext->ymax - ext->ymin);
p2.y = h - y_tmp + y_ofs;
p1.y = p2.y;
for(i = 0; i < ext->point_cnt; i++) {
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;
if(p1.y == p2.y) {
p2.x++;
}
if(ser->points[p_act] != LV_CHART_POINT_DEF) {
lv_draw_line(&p1, &p2, mask, &style, opa_scale);
}
p2.x = ((w * p_act) / (ext->point_cnt - 1)) + x_ofs;
p1.x = p2.x;
p1.y = p2.y;
}
}
}
/**
* Draw the data lines as areas on a chart
* @param obj pointer to chart object
*/
static void lv_chart_draw_areas(lv_obj_t * chart, const lv_area_t * mask)
{
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_obj_get_width(chart);
lv_coord_t h = lv_obj_get_height(chart);
lv_coord_t x_ofs = chart->coords.x1;
lv_coord_t y_ofs = chart->coords.y1;
int32_t y_tmp;
lv_coord_t p_prev;
lv_coord_t p_act;
lv_chart_series_t * ser;
lv_opa_t opa_scale = lv_obj_get_opa_scale(chart);
lv_style_t style;
lv_style_copy(&style, &lv_style_plain);
/*Go through all data lines*/
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;
style.body.main_color = ser->color;
style.body.opa = ext->series.opa;
p2.x = 0 + x_ofs;
p_prev = start_point;
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 = 1; i < ext->point_cnt; i++) {
p1.x = p2.x;
p1.y = p2.y;
p_act = (start_point + i) % ext->point_cnt;
p2.x = ((w * i) / (ext->point_cnt - 1)) + x_ofs;
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;
if(ser->points[p_prev] != LV_CHART_POINT_DEF && ser->points[p_act] != LV_CHART_POINT_DEF) {
lv_point_t triangle_points[3];
triangle_points[0] = p1;
triangle_points[1] = p2;
triangle_points[2].x = p1.x;
triangle_points[2].y = chart->coords.y2;
lv_draw_triangle(triangle_points, mask, &style, opa_scale);
triangle_points[2].x = p2.x;
triangle_points[0].y = chart->coords.y2;
lv_draw_triangle(triangle_points, mask, &style, opa_scale);
}
p_prev = p_act;
}
}
}
/**
* 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 lv_chart_create_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 lv_chart_get_next_label(lv_chart_label_iterator_t * iterator, char * buf)
{
uint8_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 lv_chart_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 lv_chart_draw_y_ticks(lv_obj_t * chart, 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) {
const lv_style_t * style = lv_obj_get_style(chart);
lv_opa_t opa_scale = lv_obj_get_opa_scale(chart);
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 = chart->coords.y1;
lv_coord_t h = lv_obj_get_height(chart);
lv_coord_t w = lv_obj_get_width(chart);
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 = chart->coords.x1;
else
x_ofs = chart->coords.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 = lv_chart_create_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));
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.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 */
/* draw a line at moving y position */
p2.y = p1.y =
y_ofs + (int32_t)((int32_t)(h - style->line.width) * i) / num_scale_ticks;
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, style, opa_scale);
else if((y_axis->options & LV_CHART_AXIS_DRAW_LAST_TICK) != 0)
lv_draw_line(&p1, &p2, mask, style, opa_scale);
} else {
if(i != num_scale_ticks)
lv_draw_line(&p1, &p2, mask, style, opa_scale);
else if((y_axis->options & LV_CHART_AXIS_DRAW_LAST_TICK) != 0)
lv_draw_line(&p1, &p2, mask, style, opa_scale);
}
/* draw values if available */
if(num_of_labels != 0) {
/* add text only to major tick */
if(lv_chart_is_tick_with_label(i, y_axis)) {
lv_chart_get_next_label(&iter, buf);
/* reserve appropriate area */
lv_point_t size;
lv_txt_get_size(&size, buf, style->text.font, style->text.letter_space, style->text.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 - LV_CHART_AXIS_TO_LABEL_DISTANCE;
a.x2 = p2.x - LV_CHART_AXIS_TO_LABEL_DISTANCE;
} else {
a.x1 = p2.x + LV_CHART_AXIS_TO_LABEL_DISTANCE;
a.x2 = p2.x + size.x + LV_CHART_AXIS_TO_LABEL_DISTANCE;
}
lv_draw_label(&a, mask, style, opa_scale, buf, LV_TXT_FLAG_CENTER, NULL, NULL, NULL, lv_obj_get_base_dir(chart));
}
}
}
}
}
static void lv_chart_draw_x_ticks(lv_obj_t * chart, 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) {
const lv_style_t * style = lv_obj_get_style(chart);
lv_opa_t opa_scale = lv_obj_get_opa_scale(chart);
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 = chart->coords.x1;
lv_coord_t y_ofs = chart->coords.y1;
lv_coord_t h = lv_obj_get_height(chart);
lv_coord_t w = lv_obj_get_width(chart);
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 = lv_chart_create_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 - style->line.width) * i) / num_scale_ticks;
if(i != num_scale_ticks)
lv_draw_line(&p1, &p2, mask, style, opa_scale);
else if((ext->x_axis.options & LV_CHART_AXIS_DRAW_LAST_TICK) != 0)
lv_draw_line(&p1, &p2, mask, style, opa_scale);
/* draw values if available */
if(num_of_labels != 0) {
/* add text only to major tick */
if(lv_chart_is_tick_with_label(i, &(ext->x_axis))) {
lv_chart_get_next_label(&iter, buf);
/* reserve appropriate area */
lv_point_t size;
lv_txt_get_size(&size, buf, style->text.font, style->text.letter_space, style->text.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 + LV_CHART_AXIS_TO_LABEL_DISTANCE), (p2.x + size.x / 2),
(p2.y + size.y + LV_CHART_AXIS_TO_LABEL_DISTANCE)};
lv_draw_label(&a, mask, style, opa_scale, buf, LV_TXT_FLAG_CENTER, NULL, NULL, NULL, lv_obj_get_base_dir(chart));
}
}
}
}
}
static void lv_chart_draw_axes(lv_obj_t * chart, const lv_area_t * mask)
{
lv_chart_draw_y_ticks(chart, mask, LV_CHART_AXIS_PRIMARY_Y);
lv_chart_draw_y_ticks(chart, mask, LV_CHART_AXIS_SECONDARY_Y);
lv_chart_draw_x_ticks(chart, mask);
}
/**
* invalid area of the new line data lines on a chart
* @param obj pointer to chart object
*/
static void lv_chart_inv_lines(lv_obj_t * chart, uint16_t i)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
lv_coord_t w = lv_obj_get_width(chart);
lv_coord_t x_ofs = chart->coords.x1;
if(i < ext->point_cnt) {
lv_area_t coords;
lv_obj_get_coords(chart, &coords);
if(i < ext->point_cnt - 1) {
coords.x1 = ((w * i) / (ext->point_cnt - 1)) + x_ofs - ext->series.width;
coords.x2 = ((w * (i + 1)) / (ext->point_cnt - 1)) + x_ofs + ext->series.width;
lv_obj_invalidate_area(chart, &coords);
}
if(i > 0) {
coords.x1 = ((w * (i - 1)) / (ext->point_cnt - 1)) + x_ofs - ext->series.width;
coords.x2 = ((w * i) / (ext->point_cnt - 1)) + x_ofs + ext->series.width;
lv_obj_invalidate_area(chart, &coords);
}
}
}
/**
* invalid area of the new point data lines on a chart
* @param chart pointer to chart object
* @param mask mask, inherited from the design function
*/
static void lv_chart_inv_points(lv_obj_t * chart, uint16_t i)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
lv_area_t cir_a;
lv_coord_t w = lv_obj_get_width(chart);
lv_coord_t x_ofs = chart->coords.x1;
lv_obj_get_coords(chart, &cir_a);
cir_a.x1 = ((w * i) / (ext->point_cnt - 1)) + x_ofs;
cir_a.x2 = cir_a.x1 + ext->series.width;
cir_a.x1 -= ext->series.width;
lv_inv_area(lv_obj_get_disp(chart), &cir_a);
}
/**
* 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 lv_chart_inv_cols(lv_obj_t * chart, uint16_t i)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
lv_area_t col_a;
lv_coord_t w = lv_obj_get_width(chart);
lv_coord_t col_w = w / ((ext->series.num + 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 += chart->coords.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);
}
#endif
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