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lvgl_cpp/lvgl/extra/widgets/chart/lv_chart.c

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/**
* @file lv_chart.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_chart.h"
#if LV_USE_CHART != 0
#include "../../../misc/lv_assert.h"
/*********************
* DEFINES
*********************/
#define MY_CLASS &lv_chart_class
#define LV_CHART_HDIV_DEF 3
#define LV_CHART_VDIV_DEF 5
#define LV_CHART_POINT_CNT_DEF 10
#define LV_CHART_LABEL_MAX_TEXT_LENGTH 16
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static void lv_chart_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
static void lv_chart_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
static void lv_chart_event(const lv_obj_class_t * class_p, lv_event_t * e);
static void draw_div_lines(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx);
static void draw_series_line(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx);
static void draw_series_bar(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx);
static void draw_series_scatter(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx);
static void draw_cursors(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx);
static void draw_axes(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx);
static uint32_t get_index_from_x(lv_obj_t * obj, lv_coord_t x);
static void invalidate_point(lv_obj_t * obj, uint16_t i);
static void new_points_alloc(lv_obj_t * obj, lv_chart_series_t * ser, uint32_t cnt, lv_coord_t ** a);
lv_chart_tick_dsc_t * get_tick_gsc(lv_obj_t * obj, lv_chart_axis_t axis);
/**********************
* STATIC VARIABLES
**********************/
const lv_obj_class_t lv_chart_class = {
.constructor_cb = lv_chart_constructor,
.destructor_cb = lv_chart_destructor,
.event_cb = lv_chart_event,
.width_def = LV_PCT(100),
.height_def = LV_DPI_DEF * 2,
.instance_size = sizeof(lv_chart_t),
.base_class = &lv_obj_class
};
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
lv_obj_t * lv_chart_create(lv_obj_t * parent)
{
LV_LOG_INFO("begin");
lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
lv_obj_class_init_obj(obj);
return obj;
}
void lv_chart_set_type(lv_obj_t * obj, lv_chart_type_t type)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
if(chart->type == type) return;
if(chart->type == LV_CHART_TYPE_SCATTER) {
lv_chart_series_t * ser;
_LV_LL_READ_BACK(&chart->series_ll, ser) {
lv_mem_free(ser->x_points);
ser->x_points = NULL;
}
}
if(type == LV_CHART_TYPE_SCATTER) {
lv_chart_series_t * ser;
_LV_LL_READ_BACK(&chart->series_ll, ser) {
ser->x_points = lv_mem_alloc(sizeof(lv_point_t) * chart->point_cnt);
LV_ASSERT_MALLOC(ser->x_points);
if(ser->x_points == NULL) return;
}
}
chart->type = type;
lv_chart_refresh(obj);
}
void lv_chart_set_point_count(lv_obj_t * obj, uint16_t cnt)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
if(chart->point_cnt == cnt) return;
lv_chart_series_t * ser;
if(cnt < 1) cnt = 1;
_LV_LL_READ_BACK(&chart->series_ll, ser) {
if(chart->type == LV_CHART_TYPE_SCATTER) {
if(!ser->x_ext_buf_assigned) new_points_alloc(obj, ser, cnt, &ser->x_points);
}
if(!ser->y_ext_buf_assigned) new_points_alloc(obj, ser, cnt, &ser->y_points);
ser->start_point = 0;
}
chart->point_cnt = cnt;
lv_chart_refresh(obj);
}
void lv_chart_set_range(lv_obj_t * obj, lv_chart_axis_t axis, lv_coord_t min, lv_coord_t max)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
max = max == min ? max + 1 : max;
lv_chart_t * chart = (lv_chart_t *)obj;
switch(axis) {
case LV_CHART_AXIS_PRIMARY_Y:
chart->ymin[0] = min;
chart->ymax[0] = max;
break;
case LV_CHART_AXIS_SECONDARY_Y:
chart->ymin[1] = min;
chart->ymax[1] = max;
break;
case LV_CHART_AXIS_PRIMARY_X:
chart->xmin[0] = min;
chart->xmax[0] = max;
break;
case LV_CHART_AXIS_SECONDARY_X:
chart->xmin[1] = min;
chart->xmax[1] = max;
break;
default:
LV_LOG_WARN("Invalid axis: %d", axis);
return;
}
lv_chart_refresh(obj);
}
void lv_chart_set_update_mode(lv_obj_t * obj, lv_chart_update_mode_t update_mode)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
if(chart->update_mode == update_mode) return;
chart->update_mode = update_mode;
lv_obj_invalidate(obj);
}
void lv_chart_set_div_line_count(lv_obj_t * obj, uint8_t hdiv, uint8_t vdiv)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
if(chart->hdiv_cnt == hdiv && chart->vdiv_cnt == vdiv) return;
chart->hdiv_cnt = hdiv;
chart->vdiv_cnt = vdiv;
lv_obj_invalidate(obj);
}
void lv_chart_set_zoom_x(lv_obj_t * obj, uint16_t zoom_x)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
if(chart->zoom_x == zoom_x) return;
chart->zoom_x = zoom_x;
lv_obj_refresh_self_size(obj);
/*Be the chart doesn't remain scrolled out*/
lv_obj_readjust_scroll(obj, LV_ANIM_OFF);
lv_obj_invalidate(obj);
}
void lv_chart_set_zoom_y(lv_obj_t * obj, uint16_t zoom_y)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
if(chart->zoom_y == zoom_y) return;
chart->zoom_y = zoom_y;
lv_obj_refresh_self_size(obj);
/*Be the chart doesn't remain scrolled out*/
lv_obj_readjust_scroll(obj, LV_ANIM_OFF);
lv_obj_invalidate(obj);
}
uint16_t lv_chart_get_zoom_x(const lv_obj_t * obj)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
return chart->zoom_x;
}
uint16_t lv_chart_get_zoom_y(const lv_obj_t * obj)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
return chart->zoom_y;
}
void lv_chart_set_axis_tick(lv_obj_t * obj, lv_chart_axis_t axis, lv_coord_t major_len, lv_coord_t minor_len,
lv_coord_t major_cnt, lv_coord_t minor_cnt, bool label_en, lv_coord_t draw_size)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_tick_dsc_t * t = get_tick_gsc(obj, axis);
t->major_len = major_len;
t->minor_len = minor_len;
t->minor_cnt = minor_cnt;
t->major_cnt = major_cnt;
t->label_en = label_en;
t->draw_size = draw_size;
lv_obj_refresh_ext_draw_size(obj);
lv_obj_invalidate(obj);
}
lv_chart_type_t lv_chart_get_type(const lv_obj_t * obj)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
return chart->type;
}
uint16_t lv_chart_get_point_count(const lv_obj_t * obj)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
return chart->point_cnt;
}
uint16_t lv_chart_get_x_start_point(const lv_obj_t * obj, lv_chart_series_t * ser)
{
LV_UNUSED(obj);
LV_ASSERT_NULL(ser);
return ser->start_point;
}
void lv_chart_get_point_pos_by_id(lv_obj_t * obj, lv_chart_series_t * ser, uint16_t id, lv_point_t * p_out)
{
LV_ASSERT_NULL(obj);
LV_ASSERT_NULL(ser);
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
if(id >= chart->point_cnt) {
LV_LOG_WARN("Invalid index: %d", id);
p_out->x = 0;
p_out->y = 0;
return;
}
lv_coord_t w = ((int32_t)lv_obj_get_content_width(obj) * chart->zoom_x) >> 8;
lv_coord_t h = ((int32_t)lv_obj_get_content_height(obj) * chart->zoom_y) >> 8;
if(chart->type == LV_CHART_TYPE_LINE) {
p_out->x = (w * id) / (chart->point_cnt - 1);
}
else if(chart->type == LV_CHART_TYPE_SCATTER) {
p_out->x = lv_map(ser->x_points[id], chart->xmin[ser->x_axis_sec], chart->xmax[ser->x_axis_sec], 0, w);
}
else if(chart->type == LV_CHART_TYPE_BAR) {
uint32_t ser_cnt = _lv_ll_get_len(&chart->series_ll);
int32_t ser_gap = ((int32_t)lv_obj_get_style_pad_column(obj,
LV_PART_ITEMS) * chart->zoom_x) >> 8; /*Gap between the column on the ~same X*/
int32_t block_gap = ((int32_t)lv_obj_get_style_pad_column(obj,
LV_PART_MAIN) * chart->zoom_x) >> 8; /*Gap between the column on ~adjacent X*/
lv_coord_t block_w = (w - ((chart->point_cnt - 1) * block_gap)) / chart->point_cnt;
lv_coord_t col_w = block_w / ser_cnt;
p_out->x = (int32_t)((int32_t)w * id) / chart->point_cnt;
lv_chart_series_t * ser_i = NULL;
_LV_LL_READ_BACK(&chart->series_ll, ser_i) {
if(ser_i == ser) break;
p_out->x += col_w;
}
p_out->x += (col_w - ser_gap) / 2;
}
lv_coord_t border_width = lv_obj_get_style_border_width(obj, LV_PART_MAIN);
p_out->x += lv_obj_get_style_pad_left(obj, LV_PART_MAIN) + border_width;
p_out->x -= lv_obj_get_scroll_left(obj);
int32_t temp_y = 0;
temp_y = (int32_t)((int32_t)ser->y_points[id] - chart->ymin[ser->y_axis_sec]) * h;
temp_y = temp_y / (chart->ymax[ser->y_axis_sec] - chart->ymin[ser->y_axis_sec]);
p_out->y = h - temp_y;
p_out->y += lv_obj_get_style_pad_top(obj, LV_PART_MAIN) + border_width;
p_out->y -= lv_obj_get_scroll_top(obj);
}
void lv_chart_refresh(lv_obj_t * obj)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_obj_invalidate(obj);
}
/*======================
* Series
*=====================*/
lv_chart_series_t * lv_chart_add_series(lv_obj_t * obj, lv_color_t color, lv_chart_axis_t axis)
{
LV_LOG_INFO("begin");
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
lv_chart_series_t * ser = _lv_ll_ins_head(&chart->series_ll);
LV_ASSERT_MALLOC(ser);
if(ser == NULL) return NULL;
lv_coord_t def = LV_CHART_POINT_NONE;
ser->color = color;
ser->y_points = lv_mem_alloc(sizeof(lv_coord_t) * chart->point_cnt);
LV_ASSERT_MALLOC(ser->y_points);
if(chart->type == LV_CHART_TYPE_SCATTER) {
ser->x_points = lv_mem_alloc(sizeof(lv_coord_t) * chart->point_cnt);
LV_ASSERT_MALLOC(ser->x_points);
}
if(ser->y_points == NULL) {
_lv_ll_remove(&chart->series_ll, ser);
lv_mem_free(ser);
return NULL;
}
ser->start_point = 0;
ser->y_ext_buf_assigned = false;
ser->hidden = 0;
ser->x_axis_sec = axis & LV_CHART_AXIS_SECONDARY_X ? 1 : 0;
ser->y_axis_sec = axis & LV_CHART_AXIS_SECONDARY_Y ? 1 : 0;
uint16_t i;
lv_coord_t * p_tmp = ser->y_points;
for(i = 0; i < chart->point_cnt; i++) {
*p_tmp = def;
p_tmp++;
}
return ser;
}
void lv_chart_remove_series(lv_obj_t * obj, lv_chart_series_t * series)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(series);
lv_chart_t * chart = (lv_chart_t *)obj;
if(!series->y_ext_buf_assigned && series->y_points) lv_mem_free(series->y_points);
_lv_ll_remove(&chart->series_ll, series);
lv_mem_free(series);
return;
}
void lv_chart_hide_series(lv_obj_t * chart, lv_chart_series_t * series, bool hide)
{
LV_ASSERT_OBJ(chart, MY_CLASS);
LV_ASSERT_NULL(series);
series->hidden = hide ? 1 : 0;
lv_chart_refresh(chart);
}
void lv_chart_set_series_color(lv_obj_t * chart, lv_chart_series_t * series, lv_color_t color)
{
LV_ASSERT_OBJ(chart, MY_CLASS);
LV_ASSERT_NULL(series);
series->color = color;
lv_chart_refresh(chart);
}
void lv_chart_set_x_start_point(lv_obj_t * obj, lv_chart_series_t * ser, uint16_t id)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(ser);
lv_chart_t * chart = (lv_chart_t *)obj;
if(id >= chart->point_cnt) return;
ser->start_point = id;
}
lv_chart_series_t * lv_chart_get_series_next(const lv_obj_t * obj, const lv_chart_series_t * ser)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
if(ser == NULL) return _lv_ll_get_head(&chart->series_ll);
else return _lv_ll_get_next(&chart->series_ll, ser);
}
/*=====================
* Cursor
*====================*/
/**
* Add a cursor with a given color
* @param chart pointer to chart object
* @param color color of the cursor
* @param dir direction of the cursor. `LV_DIR_RIGHT/LEFT/TOP/DOWN/HOR/VER/ALL`. OR-ed values are possible
* @return pointer to the created cursor
*/
lv_chart_cursor_t * lv_chart_add_cursor(lv_obj_t * obj, lv_color_t color, lv_dir_t dir)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
lv_chart_cursor_t * cursor = _lv_ll_ins_head(&chart->cursor_ll);
LV_ASSERT_MALLOC(cursor);
if(cursor == NULL) return NULL;
cursor->pos.x = LV_CHART_POINT_NONE;
cursor->pos.y = LV_CHART_POINT_NONE;
cursor->point_id = LV_CHART_POINT_NONE;
cursor->pos_set = 0;
cursor->color = color;
cursor->dir = dir;
return cursor;
}
/**
* Set the coordinate of the cursor with respect
* to the origin of series area of the chart.
* @param chart pointer to a chart object.
* @param cursor pointer to the cursor.
* @param pos the new coordinate of cursor relative to the series area
*/
void lv_chart_set_cursor_pos(lv_obj_t * chart, lv_chart_cursor_t * cursor, lv_point_t * pos)
{
LV_ASSERT_NULL(cursor);
LV_UNUSED(chart);
cursor->pos.x = pos->x;
cursor->pos.y = pos->y;
cursor->pos_set = 1;
lv_chart_refresh(chart);
}
/**
* Set the coordinate of the cursor with respect
* to the origin of series area of the chart.
* @param chart pointer to a chart object.
* @param cursor pointer to the cursor.
* @param pos the new coordinate of cursor relative to the series area
*/
void lv_chart_set_cursor_point(lv_obj_t * chart, lv_chart_cursor_t * cursor, lv_chart_series_t * ser, uint16_t point_id)
{
LV_ASSERT_NULL(cursor);
LV_UNUSED(chart);
cursor->point_id = point_id;
cursor->pos_set = 0;
if(ser == NULL) ser = lv_chart_get_series_next(chart, NULL);
cursor->ser = ser;
lv_chart_refresh(chart);
}
/**
* Get the coordinate of the cursor with respect
* to the origin of series area of the chart.
* @param chart pointer to a chart object
* @param cursor pointer to cursor
* @return coordinate of the cursor as lv_point_t
*/
lv_point_t lv_chart_get_cursor_point(lv_obj_t * chart, lv_chart_cursor_t * cursor)
{
LV_ASSERT_NULL(cursor);
LV_UNUSED(chart);
return cursor->pos;
}
/*=====================
* Set/Get value(s)
*====================*/
void lv_chart_set_all_value(lv_obj_t * obj, lv_chart_series_t * ser, lv_coord_t value)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(ser);
lv_chart_t * chart = (lv_chart_t *)obj;
uint16_t i;
for(i = 0; i < chart->point_cnt; i++) {
ser->y_points[i] = value;
}
ser->start_point = 0;
lv_chart_refresh(obj);
}
void lv_chart_set_next_value(lv_obj_t * obj, lv_chart_series_t * ser, lv_coord_t value)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(ser);
lv_chart_t * chart = (lv_chart_t *)obj;
ser->y_points[ser->start_point] = value;
invalidate_point(obj, ser->start_point);
ser->start_point = (ser->start_point + 1) % chart->point_cnt;
invalidate_point(obj, ser->start_point);
}
void lv_chart_set_next_value2(lv_obj_t * obj, lv_chart_series_t * ser, lv_coord_t x_value, lv_coord_t y_value)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(ser);
lv_chart_t * chart = (lv_chart_t *)obj;
if(chart->type != LV_CHART_TYPE_SCATTER) {
LV_LOG_WARN("Type must be LV_CHART_TYPE_SCATTER");
return;
}
ser->x_points[ser->start_point] = x_value;
ser->y_points[ser->start_point] = y_value;
ser->start_point = (ser->start_point + 1) % chart->point_cnt;
invalidate_point(obj, ser->start_point);
}
void lv_chart_set_value_by_id(lv_obj_t * obj, lv_chart_series_t * ser, uint16_t id, lv_coord_t value)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(ser);
lv_chart_t * chart = (lv_chart_t *)obj;
if(id >= chart->point_cnt) return;
ser->y_points[id] = value;
invalidate_point(obj, id);
}
void lv_chart_set_value_by_id2(lv_obj_t * obj, lv_chart_series_t * ser, uint16_t id, lv_coord_t x_value,
lv_coord_t y_value)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(ser);
lv_chart_t * chart = (lv_chart_t *)obj;
if(chart->type != LV_CHART_TYPE_SCATTER) {
LV_LOG_WARN("Type must be LV_CHART_TYPE_SCATTER");
return;
}
if(id >= chart->point_cnt) return;
ser->x_points[id] = x_value;
ser->y_points[id] = y_value;
invalidate_point(obj, id);
}
void lv_chart_set_ext_y_array(lv_obj_t * obj, lv_chart_series_t * ser, lv_coord_t array[])
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(ser);
if(!ser->y_ext_buf_assigned && ser->y_points) lv_mem_free(ser->y_points);
ser->y_ext_buf_assigned = true;
ser->y_points = array;
lv_obj_invalidate(obj);
}
void lv_chart_set_ext_x_array(lv_obj_t * obj, lv_chart_series_t * ser, lv_coord_t array[])
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(ser);
if(!ser->x_ext_buf_assigned && ser->x_points) lv_mem_free(ser->x_points);
ser->x_ext_buf_assigned = true;
ser->x_points = array;
lv_obj_invalidate(obj);
}
lv_coord_t * lv_chart_get_y_array(const lv_obj_t * obj, lv_chart_series_t * ser)
{
LV_UNUSED(obj);
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(ser);
return ser->y_points;
}
lv_coord_t * lv_chart_get_x_array(const lv_obj_t * obj, lv_chart_series_t * ser)
{
LV_UNUSED(obj);
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(ser);
return ser->x_points;
}
uint32_t lv_chart_get_pressed_point(const lv_obj_t * obj)
{
lv_chart_t * chart = (lv_chart_t *)obj;
return chart->pressed_point_id;
}
/**********************
* STATIC FUNCTIONS
**********************/
static void lv_chart_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
{
LV_UNUSED(class_p);
LV_TRACE_OBJ_CREATE("begin");
lv_chart_t * chart = (lv_chart_t *)obj;
_lv_ll_init(&chart->series_ll, sizeof(lv_chart_series_t));
_lv_ll_init(&chart->cursor_ll, sizeof(lv_chart_cursor_t));
chart->ymin[0] = 0;
chart->xmin[0] = 0;
chart->ymin[1] = 0;
chart->xmin[1] = 0;
chart->ymax[0] = 100;
chart->xmax[0] = 100;
chart->ymax[1] = 100;
chart->xmax[1] = 100;
chart->hdiv_cnt = LV_CHART_HDIV_DEF;
chart->vdiv_cnt = LV_CHART_VDIV_DEF;
chart->point_cnt = LV_CHART_POINT_CNT_DEF;
chart->pressed_point_id = LV_CHART_POINT_NONE;
chart->type = LV_CHART_TYPE_LINE;
chart->update_mode = LV_CHART_UPDATE_MODE_SHIFT;
chart->zoom_x = LV_IMG_ZOOM_NONE;
chart->zoom_y = LV_IMG_ZOOM_NONE;
LV_TRACE_OBJ_CREATE("finished");
}
static void lv_chart_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
{
LV_UNUSED(class_p);
LV_TRACE_OBJ_CREATE("begin");
lv_chart_t * chart = (lv_chart_t *)obj;
lv_chart_series_t * ser;
while(chart->series_ll.head) {
ser = _lv_ll_get_head(&chart->series_ll);
if(!ser->y_ext_buf_assigned) lv_mem_free(ser->y_points);
_lv_ll_remove(&chart->series_ll, ser);
lv_mem_free(ser);
}
_lv_ll_clear(&chart->series_ll);
lv_chart_cursor_t * cur;
while(chart->cursor_ll.head) {
cur = _lv_ll_get_head(&chart->cursor_ll);
_lv_ll_remove(&chart->cursor_ll, cur);
lv_mem_free(cur);
}
_lv_ll_clear(&chart->cursor_ll);
LV_TRACE_OBJ_CREATE("finished");
}
static void lv_chart_event(const lv_obj_class_t * class_p, lv_event_t * e)
{
LV_UNUSED(class_p);
/*Call the ancestor's event handler*/
lv_res_t res;
res = lv_obj_event_base(MY_CLASS, e);
if(res != LV_RES_OK) return;
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * obj = lv_event_get_target(e);
lv_chart_t * chart = (lv_chart_t *)obj;
if(code == LV_EVENT_PRESSED) {
lv_indev_t * indev = lv_indev_get_act();
lv_point_t p;
lv_indev_get_point(indev, &p);
p.x -= obj->coords.x1;
uint32_t id = get_index_from_x(obj, p.x + lv_obj_get_scroll_left(obj));
if(id != chart->pressed_point_id) {
invalidate_point(obj, id);
invalidate_point(obj, chart->pressed_point_id);
chart->pressed_point_id = id;
lv_event_send(obj, LV_EVENT_VALUE_CHANGED, NULL);
}
}
else if(code == LV_EVENT_RELEASED) {
invalidate_point(obj, chart->pressed_point_id);
chart->pressed_point_id = LV_CHART_POINT_NONE;
}
else if(code == LV_EVENT_SIZE_CHANGED) {
lv_obj_refresh_self_size(obj);
}
else if(code == LV_EVENT_REFR_EXT_DRAW_SIZE) {
lv_event_set_ext_draw_size(e, LV_MAX4(chart->tick[0].draw_size, chart->tick[1].draw_size, chart->tick[2].draw_size,
chart->tick[3].draw_size));
}
else if(code == LV_EVENT_GET_SELF_SIZE) {
lv_point_t * p = lv_event_get_param(e);
p->x = ((int32_t)lv_obj_get_content_width(obj) * chart->zoom_x) >> 8;
p->y = ((int32_t)lv_obj_get_content_height(obj) * chart->zoom_y) >> 8;
}
else if(code == LV_EVENT_DRAW_MAIN) {
lv_draw_ctx_t * draw_ctx = lv_event_get_draw_ctx(e);
draw_div_lines(obj, draw_ctx);
draw_axes(obj, draw_ctx);
if(_lv_ll_is_empty(&chart->series_ll) == false) {
if(chart->type == LV_CHART_TYPE_LINE) draw_series_line(obj, draw_ctx);
else if(chart->type == LV_CHART_TYPE_BAR) draw_series_bar(obj, draw_ctx);
else if(chart->type == LV_CHART_TYPE_SCATTER) draw_series_scatter(obj, draw_ctx);
}
draw_cursors(obj, draw_ctx);
}
}
static void draw_div_lines(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx)
{
lv_chart_t * chart = (lv_chart_t *)obj;
lv_area_t series_clip_area;
bool mask_ret = _lv_area_intersect(&series_clip_area, &obj->coords, draw_ctx->clip_area);
if(mask_ret == false) return;
const lv_area_t * clip_area_ori = draw_ctx->clip_area;
draw_ctx->clip_area = &series_clip_area;
int16_t i;
int16_t i_start;
int16_t i_end;
lv_point_t p1;
lv_point_t p2;
lv_coord_t border_width = lv_obj_get_style_border_width(obj, LV_PART_MAIN);
lv_coord_t pad_left = lv_obj_get_style_pad_left(obj, LV_PART_MAIN) + border_width;
lv_coord_t pad_top = lv_obj_get_style_pad_top(obj, LV_PART_MAIN) + border_width;
lv_coord_t w = ((int32_t)lv_obj_get_content_width(obj) * chart->zoom_x) >> 8;
lv_coord_t h = ((int32_t)lv_obj_get_content_height(obj) * chart->zoom_y) >> 8;
lv_draw_line_dsc_t line_dsc;
lv_draw_line_dsc_init(&line_dsc);
lv_obj_init_draw_line_dsc(obj, LV_PART_MAIN, &line_dsc);
lv_obj_draw_part_dsc_t part_draw_dsc;
lv_obj_draw_dsc_init(&part_draw_dsc, draw_ctx);
part_draw_dsc.part = LV_PART_MAIN;
part_draw_dsc.class_p = MY_CLASS;
part_draw_dsc.type = LV_CHART_DRAW_PART_DIV_LINE_INIT;
part_draw_dsc.line_dsc = &line_dsc;
part_draw_dsc.id = 0xFFFFFFFF;
part_draw_dsc.p1 = NULL;
part_draw_dsc.p2 = NULL;
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
lv_opa_t border_opa = lv_obj_get_style_border_opa(obj, LV_PART_MAIN);
lv_coord_t border_w = lv_obj_get_style_border_width(obj, LV_PART_MAIN);
lv_border_side_t border_side = lv_obj_get_style_border_side(obj, LV_PART_MAIN);
lv_coord_t scroll_left = lv_obj_get_scroll_left(obj);
lv_coord_t scroll_top = lv_obj_get_scroll_top(obj);
if(chart->hdiv_cnt != 0) {
lv_coord_t y_ofs = obj->coords.y1 + pad_top - scroll_top;
p1.x = obj->coords.x1;
p2.x = obj->coords.x2;
i_start = 0;
i_end = chart->hdiv_cnt;
if(border_opa > LV_OPA_MIN && border_w > 0) {
if((border_side & LV_BORDER_SIDE_TOP) && (lv_obj_get_style_pad_top(obj, LV_PART_MAIN) == 0)) i_start++;
if((border_side & LV_BORDER_SIDE_BOTTOM) && (lv_obj_get_style_pad_bottom(obj, LV_PART_MAIN) == 0)) i_end--;
}
for(i = i_start; i < i_end; i++) {
p1.y = (int32_t)((int32_t)h * i) / (chart->hdiv_cnt - 1);
p1.y += y_ofs;
p2.y = p1.y;
part_draw_dsc.class_p = MY_CLASS;
part_draw_dsc.type = LV_CHART_DRAW_PART_DIV_LINE_HOR;
part_draw_dsc.p1 = &p1;
part_draw_dsc.p2 = &p2;
part_draw_dsc.id = i;
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
lv_draw_line(draw_ctx, &line_dsc, &p1, &p2);
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &part_draw_dsc);
}
}
if(chart->vdiv_cnt != 0) {
lv_coord_t x_ofs = obj->coords.x1 + pad_left - scroll_left;
p1.y = obj->coords.y1;
p2.y = obj->coords.y2;
i_start = 0;
i_end = chart->vdiv_cnt;
if(border_opa > LV_OPA_MIN && border_w > 0) {
if((border_side & LV_BORDER_SIDE_LEFT) && (lv_obj_get_style_pad_left(obj, LV_PART_MAIN) == 0)) i_start++;
if((border_side & LV_BORDER_SIDE_RIGHT) && (lv_obj_get_style_pad_right(obj, LV_PART_MAIN) == 0)) i_end--;
}
for(i = i_start; i < i_end; i++) {
p1.x = (int32_t)((int32_t)w * i) / (chart->vdiv_cnt - 1);
p1.x += x_ofs;
p2.x = p1.x;
part_draw_dsc.class_p = MY_CLASS;
part_draw_dsc.type = LV_CHART_DRAW_PART_DIV_LINE_VER;
part_draw_dsc.p1 = &p1;
part_draw_dsc.p2 = &p2;
part_draw_dsc.id = i;
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
lv_draw_line(draw_ctx, &line_dsc, &p1, &p2);
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &part_draw_dsc);
}
}
part_draw_dsc.id = 0xFFFFFFFF;
part_draw_dsc.p1 = NULL;
part_draw_dsc.p2 = NULL;
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &part_draw_dsc);
draw_ctx->clip_area = clip_area_ori;
}
static void draw_series_line(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx)
{
lv_area_t clip_area;
if(_lv_area_intersect(&clip_area, &obj->coords, draw_ctx->clip_area) == false) return;
const lv_area_t * clip_area_ori = draw_ctx->clip_area;
draw_ctx->clip_area = &clip_area;
lv_chart_t * chart = (lv_chart_t *)obj;
if(chart->point_cnt < 2) return;
uint16_t i;
lv_point_t p1;
lv_point_t p2;
lv_coord_t border_width = lv_obj_get_style_border_width(obj, LV_PART_MAIN);
lv_coord_t pad_left = lv_obj_get_style_pad_left(obj, LV_PART_MAIN) + border_width;
lv_coord_t pad_top = lv_obj_get_style_pad_top(obj, LV_PART_MAIN) + border_width;
lv_coord_t w = ((int32_t)lv_obj_get_content_width(obj) * chart->zoom_x) >> 8;
lv_coord_t h = ((int32_t)lv_obj_get_content_height(obj) * chart->zoom_y) >> 8;
lv_coord_t x_ofs = obj->coords.x1 + pad_left - lv_obj_get_scroll_left(obj);
lv_coord_t y_ofs = obj->coords.y1 + pad_top - lv_obj_get_scroll_top(obj);
lv_chart_series_t * ser;
lv_area_t series_clip_area;
bool mask_ret = _lv_area_intersect(&series_clip_area, &obj->coords, draw_ctx->clip_area);
if(mask_ret == false) return;
lv_draw_line_dsc_t line_dsc_default;
lv_draw_line_dsc_init(&line_dsc_default);
lv_obj_init_draw_line_dsc(obj, LV_PART_ITEMS, &line_dsc_default);
lv_draw_rect_dsc_t point_dsc_default;
lv_draw_rect_dsc_init(&point_dsc_default);
lv_obj_init_draw_rect_dsc(obj, LV_PART_INDICATOR, &point_dsc_default);
lv_coord_t point_w = lv_obj_get_style_width(obj, LV_PART_INDICATOR) / 2;
lv_coord_t point_h = lv_obj_get_style_height(obj, LV_PART_INDICATOR) / 2;
/*Do not bother with line ending is the point will over it*/
if(LV_MIN(point_w, point_h) > line_dsc_default.width / 2) line_dsc_default.raw_end = 1;
if(line_dsc_default.width == 1) line_dsc_default.raw_end = 1;
/*If there are mire points than pixels draw only vertical lines*/
bool crowded_mode = chart->point_cnt >= w ? true : false;
/*Go through all data lines*/
_LV_LL_READ_BACK(&chart->series_ll, ser) {
if(ser->hidden) continue;
line_dsc_default.color = ser->color;
point_dsc_default.bg_color = ser->color;
lv_coord_t start_point = chart->update_mode == LV_CHART_UPDATE_MODE_SHIFT ? ser->start_point : 0;
p1.x = x_ofs;
p2.x = 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->y_points[p_prev] - chart->ymin[ser->y_axis_sec]) * h;
y_tmp = y_tmp / (chart->ymax[ser->y_axis_sec] - chart->ymin[ser->y_axis_sec]);
p2.y = h - y_tmp + y_ofs;
lv_obj_draw_part_dsc_t part_draw_dsc;
lv_obj_draw_dsc_init(&part_draw_dsc, draw_ctx);
part_draw_dsc.class_p = MY_CLASS;
part_draw_dsc.type = LV_CHART_DRAW_PART_LINE_AND_POINT;
part_draw_dsc.part = LV_PART_ITEMS;
part_draw_dsc.line_dsc = &line_dsc_default;
part_draw_dsc.rect_dsc = &point_dsc_default;
part_draw_dsc.sub_part_ptr = ser;
lv_coord_t y_min = p2.y;
lv_coord_t y_max = p2.y;
for(i = 0; i < chart->point_cnt; i++) {
p1.x = p2.x;
p1.y = p2.y;
if(p1.x > clip_area_ori->x2 + point_w + 1) break;
p2.x = ((w * i) / (chart->point_cnt - 1)) + x_ofs;
p_act = (start_point + i) % chart->point_cnt;
y_tmp = (int32_t)((int32_t)ser->y_points[p_act] - chart->ymin[ser->y_axis_sec]) * h;
y_tmp = y_tmp / (chart->ymax[ser->y_axis_sec] - chart->ymin[ser->y_axis_sec]);
p2.y = h - y_tmp + y_ofs;
if(p2.x < clip_area_ori->x1 - point_w - 1) {
p_prev = p_act;
continue;
}
/*Don't draw the first point. A second point is also required to draw the line*/
if(i != 0) {
if(crowded_mode) {
if(ser->y_points[p_prev] != LV_CHART_POINT_NONE && ser->y_points[p_act] != LV_CHART_POINT_NONE) {
/*Draw only one vertical line between the min and max y-values on the same x-value*/
y_max = LV_MAX(y_max, p2.y);
y_min = LV_MIN(y_min, p2.y);
if(p1.x != p2.x) {
lv_coord_t y_cur = p2.y;
p2.x--; /*It's already on the next x value*/
p1.x = p2.x;
p1.y = y_min;
p2.y = y_max;
if(p1.y == p2.y) p2.y++; /*If they are the same no line will be drawn*/
lv_draw_line(draw_ctx, &line_dsc_default, &p1, &p2);
p2.x++; /*Compensate the previous x--*/
y_min = y_cur; /*Start the line of the next x from the current last y*/
y_max = y_cur;
}
}
}
else {
lv_area_t point_area;
point_area.x1 = p1.x - point_w;
point_area.x2 = p1.x + point_w;
point_area.y1 = p1.y - point_h;
point_area.y2 = p1.y + point_h;
part_draw_dsc.id = i - 1;
part_draw_dsc.p1 = ser->y_points[p_prev] != LV_CHART_POINT_NONE ? &p1 : NULL;
part_draw_dsc.p2 = ser->y_points[p_act] != LV_CHART_POINT_NONE ? &p2 : NULL;
part_draw_dsc.draw_area = &point_area;
part_draw_dsc.value = ser->y_points[p_prev];
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
if(ser->y_points[p_prev] != LV_CHART_POINT_NONE && ser->y_points[p_act] != LV_CHART_POINT_NONE) {
lv_draw_line(draw_ctx, &line_dsc_default, &p1, &p2);
}
if(point_w && point_h && ser->y_points[p_prev] != LV_CHART_POINT_NONE) {
lv_draw_rect(draw_ctx, &point_dsc_default, &point_area);
}
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &part_draw_dsc);
}
}
p_prev = p_act;
}
/*Draw the last point*/
if(!crowded_mode && i == chart->point_cnt) {
if(ser->y_points[p_act] != LV_CHART_POINT_NONE) {
lv_area_t point_area;
point_area.x1 = p2.x - point_w;
point_area.x2 = p2.x + point_w;
point_area.y1 = p2.y - point_h;
point_area.y2 = p2.y + point_h;
part_draw_dsc.id = i - 1;
part_draw_dsc.p1 = NULL;
part_draw_dsc.p2 = NULL;
part_draw_dsc.draw_area = &point_area;
part_draw_dsc.value = ser->y_points[p_act];
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
lv_draw_rect(draw_ctx, &point_dsc_default, &point_area);
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &part_draw_dsc);
}
}
}
draw_ctx->clip_area = clip_area_ori;
}
static void draw_series_scatter(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx)
{
lv_area_t clip_area;
if(_lv_area_intersect(&clip_area, &obj->coords, draw_ctx->clip_area) == false) return;
const lv_area_t * clip_area_ori = draw_ctx->clip_area;
draw_ctx->clip_area = &clip_area;
lv_chart_t * chart = (lv_chart_t *)obj;
uint16_t i;
lv_point_t p1;
lv_point_t p2;
lv_coord_t border_width = lv_obj_get_style_border_width(obj, LV_PART_MAIN);
lv_coord_t pad_left = lv_obj_get_style_pad_left(obj, LV_PART_MAIN);
lv_coord_t pad_top = lv_obj_get_style_pad_top(obj, LV_PART_MAIN);
lv_coord_t w = ((int32_t)lv_obj_get_content_width(obj) * chart->zoom_x) >> 8;
lv_coord_t h = ((int32_t)lv_obj_get_content_height(obj) * chart->zoom_y) >> 8;
lv_coord_t x_ofs = obj->coords.x1 + pad_left + border_width - lv_obj_get_scroll_left(obj);
lv_coord_t y_ofs = obj->coords.y1 + pad_top + border_width - lv_obj_get_scroll_top(obj);
lv_chart_series_t * ser;
lv_draw_line_dsc_t line_dsc_default;
lv_draw_line_dsc_init(&line_dsc_default);
lv_obj_init_draw_line_dsc(obj, LV_PART_ITEMS, &line_dsc_default);
lv_draw_rect_dsc_t point_dsc_default;
lv_draw_rect_dsc_init(&point_dsc_default);
lv_obj_init_draw_rect_dsc(obj, LV_PART_INDICATOR, &point_dsc_default);
lv_coord_t point_w = lv_obj_get_style_width(obj, LV_PART_INDICATOR) / 2;
lv_coord_t point_h = lv_obj_get_style_height(obj, LV_PART_INDICATOR) / 2;
/*Do not bother with line ending is the point will over it*/
if(LV_MIN(point_w, point_h) > line_dsc_default.width / 2) line_dsc_default.raw_end = 1;
if(line_dsc_default.width == 1) line_dsc_default.raw_end = 1;
/*Go through all data lines*/
_LV_LL_READ_BACK(&chart->series_ll, ser) {
if(ser->hidden) continue;
line_dsc_default.color = ser->color;
point_dsc_default.bg_color = ser->color;
lv_coord_t start_point = chart->update_mode == LV_CHART_UPDATE_MODE_SHIFT ? ser->start_point : 0;
p1.x = x_ofs;
p2.x = x_ofs;
lv_coord_t p_act = start_point;
lv_coord_t p_prev = start_point;
if(ser->y_points[p_act] != LV_CHART_POINT_CNT_DEF) {
p2.x = lv_map(ser->x_points[p_act], chart->xmin[ser->x_axis_sec], chart->xmax[ser->x_axis_sec], 0, w);
p2.x += x_ofs;
p2.y = lv_map(ser->y_points[p_act], chart->ymin[ser->y_axis_sec], chart->ymax[ser->y_axis_sec], 0, h);
p2.y = h - p2.y;
p2.y += y_ofs;
}
else {
p2.x = LV_COORD_MIN;
p2.y = LV_COORD_MIN;
}
lv_obj_draw_part_dsc_t part_draw_dsc;
lv_obj_draw_dsc_init(&part_draw_dsc, draw_ctx);
part_draw_dsc.part = LV_PART_ITEMS;
part_draw_dsc.class_p = MY_CLASS;
part_draw_dsc.type = LV_CHART_DRAW_PART_LINE_AND_POINT;
part_draw_dsc.line_dsc = &line_dsc_default;
part_draw_dsc.rect_dsc = &point_dsc_default;
part_draw_dsc.sub_part_ptr = ser;
for(i = 0; i < chart->point_cnt; i++) {
p1.x = p2.x;
p1.y = p2.y;
p_act = (start_point + i) % chart->point_cnt;
if(ser->y_points[p_act] != LV_CHART_POINT_NONE) {
p2.y = lv_map(ser->y_points[p_act], chart->ymin[ser->y_axis_sec], chart->ymax[ser->y_axis_sec], 0, h);
p2.y = h - p2.y;
p2.y += y_ofs;
p2.x = lv_map(ser->x_points[p_act], chart->xmin[ser->x_axis_sec], chart->xmax[ser->x_axis_sec], 0, w);
p2.x += x_ofs;
}
else {
p_prev = p_act;
continue;
}
/*Don't draw the first point. A second point is also required to draw the line*/
if(i != 0) {
lv_area_t point_area;
point_area.x1 = p1.x - point_w;
point_area.x2 = p1.x + point_w;
point_area.y1 = p1.y - point_h;
point_area.y2 = p1.y + point_h;
part_draw_dsc.id = i - 1;
part_draw_dsc.p1 = ser->y_points[p_prev] != LV_CHART_POINT_NONE ? &p1 : NULL;
part_draw_dsc.p2 = ser->y_points[p_act] != LV_CHART_POINT_NONE ? &p2 : NULL;
part_draw_dsc.draw_area = &point_area;
part_draw_dsc.value = ser->y_points[p_prev];
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
if(ser->y_points[p_prev] != LV_CHART_POINT_NONE && ser->y_points[p_act] != LV_CHART_POINT_NONE) {
lv_draw_line(draw_ctx, &line_dsc_default, &p1, &p2);
if(point_w && point_h) {
lv_draw_rect(draw_ctx, &point_dsc_default, &point_area);
}
}
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &part_draw_dsc);
}
p_prev = p_act;
}
/*Draw the last point*/
if(i == chart->point_cnt) {
if(ser->y_points[p_act] != LV_CHART_POINT_NONE) {
lv_area_t point_area;
point_area.x1 = p2.x - point_w;
point_area.x2 = p2.x + point_w;
point_area.y1 = p2.y - point_h;
point_area.y2 = p2.y + point_h;
part_draw_dsc.id = i - 1;
part_draw_dsc.p1 = NULL;
part_draw_dsc.p2 = NULL;
part_draw_dsc.draw_area = &point_area;
part_draw_dsc.value = ser->y_points[p_act];
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
lv_draw_rect(draw_ctx, &point_dsc_default, &point_area);
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &part_draw_dsc);
}
}
}
draw_ctx->clip_area = clip_area_ori;
}
static void draw_series_bar(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx)
{
lv_area_t clip_area;
if(_lv_area_intersect(&clip_area, &obj->coords, draw_ctx->clip_area) == false) return;
const lv_area_t * clip_area_ori = draw_ctx->clip_area;
draw_ctx->clip_area = &clip_area;
lv_chart_t * chart = (lv_chart_t *)obj;
uint16_t i;
lv_area_t col_a;
lv_coord_t pad_left = lv_obj_get_style_pad_left(obj, LV_PART_MAIN);
lv_coord_t pad_top = lv_obj_get_style_pad_top(obj, LV_PART_MAIN);
lv_coord_t w = ((int32_t)lv_obj_get_content_width(obj) * chart->zoom_x) >> 8;
lv_coord_t h = ((int32_t)lv_obj_get_content_height(obj) * chart->zoom_y) >> 8;
int32_t y_tmp;
lv_chart_series_t * ser;
uint32_t ser_cnt = _lv_ll_get_len(&chart->series_ll);
int32_t block_gap = ((int32_t)lv_obj_get_style_pad_column(obj,
LV_PART_MAIN) * chart->zoom_x) >> 8; /*Gap between the column on ~adjacent X*/
lv_coord_t block_w = (w - ((chart->point_cnt - 1) * block_gap)) / chart->point_cnt;
lv_coord_t col_w = block_w / ser_cnt;
int32_t ser_gap = ((int32_t)lv_obj_get_style_pad_column(obj,
LV_PART_ITEMS) * chart->zoom_x) >> 8; /*Gap between the column on the ~same X*/
lv_coord_t x_ofs = pad_left - lv_obj_get_scroll_left(obj);
lv_coord_t y_ofs = pad_top - lv_obj_get_scroll_top(obj);
lv_draw_rect_dsc_t col_dsc;
lv_draw_rect_dsc_init(&col_dsc);
lv_obj_init_draw_rect_dsc(obj, LV_PART_ITEMS, &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 = obj->coords.y2 + col_dsc.radius;
lv_obj_draw_part_dsc_t part_draw_dsc;
lv_obj_draw_dsc_init(&part_draw_dsc, draw_ctx);
part_draw_dsc.part = LV_PART_ITEMS;
part_draw_dsc.class_p = MY_CLASS;
part_draw_dsc.type = LV_CHART_DRAW_PART_BAR;
/*Go through all points*/
for(i = 0; i < chart->point_cnt; i++) {
lv_coord_t x_act = (int32_t)((int32_t)(w + block_gap) * i) / (chart->point_cnt) + obj->coords.x1 + x_ofs;
part_draw_dsc.id = i;
/*Draw the current point of all data line*/
_LV_LL_READ_BACK(&chart->series_ll, ser) {
if(ser->hidden) continue;
lv_coord_t start_point = chart->update_mode == LV_CHART_UPDATE_MODE_SHIFT ? ser->start_point : 0;
col_a.x1 = x_act;
col_a.x2 = col_a.x1 + col_w - ser_gap - 1;
x_act += col_w;
if(col_a.x2 < clip_area.x1) continue;
if(col_a.x1 > clip_area.x2) break;
col_dsc.bg_color = ser->color;
lv_coord_t p_act = (start_point + i) % chart->point_cnt;
y_tmp = (int32_t)((int32_t)ser->y_points[p_act] - chart->ymin[ser->y_axis_sec]) * h;
y_tmp = y_tmp / (chart->ymax[ser->y_axis_sec] - chart->ymin[ser->y_axis_sec]);
col_a.y1 = h - y_tmp + obj->coords.y1 + y_ofs;
if(ser->y_points[p_act] != LV_CHART_POINT_NONE) {
part_draw_dsc.draw_area = &col_a;
part_draw_dsc.rect_dsc = &col_dsc;
part_draw_dsc.sub_part_ptr = ser;
part_draw_dsc.value = ser->y_points[p_act];
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
lv_draw_rect(draw_ctx, &col_dsc, &col_a);
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &part_draw_dsc);
}
}
}
draw_ctx->clip_area = clip_area_ori;
}
static void draw_cursors(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_chart_t * chart = (lv_chart_t *)obj;
if(_lv_ll_is_empty(&chart->cursor_ll)) return;
lv_area_t clip_area;
if(!_lv_area_intersect(&clip_area, draw_ctx->clip_area, &obj->coords)) return;
const lv_area_t * clip_area_ori = draw_ctx->clip_area;
draw_ctx->clip_area = &clip_area;
lv_point_t p1;
lv_point_t p2;
lv_chart_cursor_t * cursor;
lv_draw_line_dsc_t line_dsc_ori;
lv_draw_line_dsc_init(&line_dsc_ori);
lv_obj_init_draw_line_dsc(obj, LV_PART_CURSOR, &line_dsc_ori);
lv_draw_rect_dsc_t point_dsc_ori;
lv_draw_rect_dsc_init(&point_dsc_ori);
point_dsc_ori.bg_opa = line_dsc_ori.opa;
point_dsc_ori.radius = LV_RADIUS_CIRCLE;
lv_draw_line_dsc_t line_dsc_tmp;
lv_draw_rect_dsc_t point_dsc_tmp;
lv_coord_t point_w = lv_obj_get_style_width(obj, LV_PART_CURSOR) / 2;
lv_coord_t point_h = lv_obj_get_style_width(obj, LV_PART_CURSOR) / 2;
lv_obj_draw_part_dsc_t part_draw_dsc;
lv_obj_draw_dsc_init(&part_draw_dsc, draw_ctx);
part_draw_dsc.line_dsc = &line_dsc_tmp;
part_draw_dsc.rect_dsc = &point_dsc_tmp;
part_draw_dsc.part = LV_PART_CURSOR;
part_draw_dsc.class_p = MY_CLASS;
part_draw_dsc.type = LV_CHART_DRAW_PART_CURSOR;
/*Go through all cursor lines*/
_LV_LL_READ_BACK(&chart->cursor_ll, cursor) {
lv_memcpy(&line_dsc_tmp, &line_dsc_ori, sizeof(lv_draw_line_dsc_t));
lv_memcpy(&point_dsc_tmp, &point_dsc_ori, sizeof(lv_draw_rect_dsc_t));
line_dsc_tmp.color = cursor->color;
point_dsc_tmp.bg_color = cursor->color;
part_draw_dsc.p1 = &p1;
part_draw_dsc.p2 = &p2;
lv_coord_t cx;
lv_coord_t cy;
if(cursor->pos_set) {
cx = cursor->pos.x;
cy = cursor->pos.y;
}
else {
if(cursor->point_id == LV_CHART_POINT_NONE) continue;
lv_point_t p;
lv_chart_get_point_pos_by_id(obj, cursor->ser, cursor->point_id, &p);
cx = p.x;
cy = p.y;
}
cx += obj->coords.x1;
cy += obj->coords.y1;
lv_area_t point_area;
if(point_w && point_h) {
point_area.x1 = cx - point_w;
point_area.x2 = cx + point_w;
point_area.y1 = cy - point_h;
point_area.y2 = cy + point_h;
part_draw_dsc.draw_area = &point_area;
}
else {
part_draw_dsc.draw_area = NULL;
}
if(cursor->dir & LV_DIR_HOR) {
p1.x = cursor->dir & LV_DIR_LEFT ? obj->coords.x1 : cx;
p1.y = cy;
p2.x = cursor->dir & LV_DIR_RIGHT ? obj->coords.x2 : cx;
p2.y = p1.y;
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
lv_draw_line(draw_ctx, &line_dsc_tmp, &p1, &p2);
lv_draw_rect(draw_ctx, &point_dsc_tmp, &point_area);
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &part_draw_dsc);
}
if(cursor->dir & LV_DIR_VER) {
p1.x = cx;
p1.y = cursor->dir & LV_DIR_TOP ? obj->coords.y1 : cy;
p2.x = p1.x;
p2.y = cursor->dir & LV_DIR_BOTTOM ? obj->coords.y2 : cy;
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
lv_draw_line(draw_ctx, &line_dsc_tmp, &p1, &p2);
lv_draw_rect(draw_ctx, &point_dsc_tmp, &point_area);
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &part_draw_dsc);
}
}
draw_ctx->clip_area = clip_area_ori;
}
static void draw_y_ticks(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx, lv_chart_axis_t axis)
{
lv_chart_t * chart = (lv_chart_t *)obj;
lv_chart_tick_dsc_t * t = get_tick_gsc(obj, axis);
if(t->major_cnt <= 1) return;
if(!t->label_en && !t->major_len && !t->minor_len) return;
uint8_t sec_axis = axis == LV_CHART_AXIS_PRIMARY_Y ? 0 : 1;
uint32_t i;
lv_point_t p1;
lv_point_t p2;
lv_coord_t border_width = lv_obj_get_style_border_width(obj, LV_PART_MAIN);
lv_coord_t pad_top = lv_obj_get_style_pad_top(obj, LV_PART_MAIN);
lv_coord_t h = ((int32_t)lv_obj_get_content_height(obj) * chart->zoom_y) >> 8;
lv_coord_t y_ofs = obj->coords.y1 + pad_top + border_width - lv_obj_get_scroll_top(obj);
lv_coord_t label_gap;
lv_coord_t x_ofs;
if(axis == LV_CHART_AXIS_PRIMARY_Y) {
label_gap = lv_obj_get_style_pad_left(obj, LV_PART_TICKS);
x_ofs = obj->coords.x1;
}
else {
label_gap = lv_obj_get_style_pad_right(obj, LV_PART_TICKS);
x_ofs = obj->coords.x2;
}
lv_coord_t major_len = t->major_len;
lv_coord_t minor_len = t->minor_len;
/*tick lines on secondary y axis are drawn in other direction*/
if(axis == LV_CHART_AXIS_SECONDARY_Y) {
major_len *= -1;
minor_len *= -1;
}
lv_draw_line_dsc_t line_dsc;
lv_draw_line_dsc_init(&line_dsc);
lv_obj_init_draw_line_dsc(obj, LV_PART_TICKS, &line_dsc);
lv_draw_label_dsc_t label_dsc;
lv_draw_label_dsc_init(&label_dsc);
lv_obj_init_draw_label_dsc(obj, LV_PART_TICKS, &label_dsc);
lv_obj_draw_part_dsc_t part_draw_dsc;
lv_obj_draw_dsc_init(&part_draw_dsc, draw_ctx);
part_draw_dsc.class_p = MY_CLASS;
part_draw_dsc.type = LV_CHART_DRAW_PART_TICK_LABEL;
part_draw_dsc.id = axis;
part_draw_dsc.part = LV_PART_TICKS;
part_draw_dsc.line_dsc = &line_dsc;
part_draw_dsc.label_dsc = &label_dsc;
uint32_t total_tick_num = (t->major_cnt - 1) * (t->minor_cnt);
for(i = 0; i <= total_tick_num; i++) {
/*draw a line at moving y position*/
p2.y = p1.y = y_ofs + (int32_t)((int32_t)(h - line_dsc.width) * i) / total_tick_num;
/*first point of the tick*/
p1.x = x_ofs;
/*move extra pixel out of chart boundary*/
if(axis == LV_CHART_AXIS_PRIMARY_Y) p1.x--;
else p1.x++;
/*second point of the tick*/
bool major = false;
if(i % t->minor_cnt == 0) major = true;
if(major) p2.x = p1.x - major_len; /*major tick*/
else p2.x = p1.x - minor_len; /*minor tick*/
part_draw_dsc.p1 = &p1;
part_draw_dsc.p2 = &p2;
int32_t tick_value = lv_map(total_tick_num - i, 0, total_tick_num, chart->ymin[sec_axis], chart->ymax[sec_axis]);
part_draw_dsc.value = tick_value;
/*add text only to major tick*/
if(major && t->label_en) {
char buf[LV_CHART_LABEL_MAX_TEXT_LENGTH];
lv_snprintf(buf, sizeof(buf), "%" LV_PRId32, tick_value);
part_draw_dsc.label_dsc = &label_dsc;
part_draw_dsc.text = buf;
part_draw_dsc.text_length = LV_CHART_LABEL_MAX_TEXT_LENGTH;
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
/*reserve appropriate area*/
lv_point_t size;
lv_txt_get_size(&size, part_draw_dsc.text, label_dsc.font, label_dsc.letter_space, label_dsc.line_space, LV_COORD_MAX,
LV_TEXT_FLAG_NONE);
/*set the area at some distance of the major tick len left of the tick*/
lv_area_t a;
a.y1 = p2.y - size.y / 2;
a.y2 = p2.y + size.y / 2;
if(!sec_axis) {
a.x1 = p2.x - size.x - label_gap;
a.x2 = p2.x - label_gap;
}
else {
a.x1 = p2.x + label_gap;
a.x2 = p2.x + size.x + label_gap;
}
if(a.y2 >= obj->coords.y1 &&
a.y1 <= obj->coords.y2) {
lv_draw_label(draw_ctx, &label_dsc, &a, part_draw_dsc.text, NULL);
}
}
else {
part_draw_dsc.label_dsc = NULL;
part_draw_dsc.text = NULL;
part_draw_dsc.text_length = 0;
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
}
if(p1.y + line_dsc.width / 2 >= obj->coords.y1 &&
p2.y - line_dsc.width / 2 <= obj->coords.y2) {
lv_draw_line(draw_ctx, &line_dsc, &p1, &p2);
}
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &part_draw_dsc);
}
}
static void draw_x_ticks(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx, lv_chart_axis_t axis)
{
lv_chart_t * chart = (lv_chart_t *)obj;
lv_chart_tick_dsc_t * t = get_tick_gsc(obj, axis);
if(t->major_cnt <= 1) return;
if(!t->label_en && !t->major_len && !t->minor_len) return;
uint32_t i;
lv_point_t p1;
lv_point_t p2;
lv_coord_t pad_left = lv_obj_get_style_pad_left(obj, LV_PART_MAIN) + lv_obj_get_style_border_width(obj, LV_PART_MAIN);
lv_coord_t w = ((int32_t)lv_obj_get_content_width(obj) * chart->zoom_x) >> 8;
lv_draw_label_dsc_t label_dsc;
lv_draw_label_dsc_init(&label_dsc);
lv_obj_init_draw_label_dsc(obj, LV_PART_TICKS, &label_dsc);
lv_coord_t x_ofs = obj->coords.x1 + pad_left - lv_obj_get_scroll_left(obj);
lv_coord_t y_ofs;
lv_coord_t label_gap;
if(axis == LV_CHART_AXIS_PRIMARY_X) {
label_gap = t->label_en ? lv_obj_get_style_pad_bottom(obj, LV_PART_TICKS) : 0;
y_ofs = obj->coords.y2;
}
else {
label_gap = t->label_en ? lv_obj_get_style_pad_top(obj, LV_PART_TICKS) : 0;
y_ofs = obj->coords.y1;
}
if(axis == LV_CHART_AXIS_PRIMARY_X) {
if(y_ofs > draw_ctx->clip_area->y2) return;
if(y_ofs + label_gap + label_dsc.font->line_height + t->major_len < draw_ctx->clip_area->y1) return;
}
lv_draw_line_dsc_t line_dsc;
lv_draw_line_dsc_init(&line_dsc);
lv_obj_init_draw_line_dsc(obj, LV_PART_TICKS, &line_dsc);
line_dsc.dash_gap = 0;
line_dsc.dash_width = 0;
lv_obj_draw_part_dsc_t part_draw_dsc;
lv_obj_draw_dsc_init(&part_draw_dsc, draw_ctx);
part_draw_dsc.class_p = MY_CLASS;
part_draw_dsc.type = LV_CHART_DRAW_PART_TICK_LABEL;
part_draw_dsc.id = LV_CHART_AXIS_PRIMARY_X;
part_draw_dsc.part = LV_PART_TICKS;
part_draw_dsc.label_dsc = &label_dsc;
part_draw_dsc.line_dsc = &line_dsc;
uint8_t sec_axis = axis == LV_CHART_AXIS_PRIMARY_X ? 0 : 1;
/*The columns ticks should be aligned to the center of blocks*/
if(chart->type == LV_CHART_TYPE_BAR) {
int32_t block_gap = ((int32_t)lv_obj_get_style_pad_column(obj,
LV_PART_MAIN) * chart->zoom_x) >> 8; /*Gap between the columns on ~adjacent X*/
lv_coord_t block_w = (w + block_gap) / (chart->point_cnt);
x_ofs += (block_w - block_gap) / 2;
w -= block_w - block_gap;
}
p1.y = y_ofs;
uint32_t total_tick_num = (t->major_cnt - 1) * t->minor_cnt;
for(i = 0; i <= total_tick_num; i++) { /*one extra loop - it may not exist in the list, empty label*/
bool major = false;
if(i % t->minor_cnt == 0) major = true;
/*draw a line at moving x position*/
p2.x = p1.x = x_ofs + (int32_t)((int32_t)(w - line_dsc.width) * i) / total_tick_num;
if(sec_axis) p2.y = p1.y - (major ? t->major_len : t->minor_len);
else p2.y = p1.y + (major ? t->major_len : t->minor_len);
part_draw_dsc.p1 = &p1;
part_draw_dsc.p2 = &p2;
/*add text only to major tick*/
int32_t tick_value;
if(chart->type == LV_CHART_TYPE_SCATTER) {
tick_value = lv_map(i, 0, total_tick_num, chart->xmin[sec_axis], chart->xmax[sec_axis]);
}
else {
tick_value = i / t->minor_cnt;
}
part_draw_dsc.value = tick_value;
if(major && t->label_en) {
char buf[LV_CHART_LABEL_MAX_TEXT_LENGTH];
lv_snprintf(buf, sizeof(buf), "%" LV_PRId32, tick_value);
part_draw_dsc.label_dsc = &label_dsc;
part_draw_dsc.text = buf;
part_draw_dsc.text_length = LV_CHART_LABEL_MAX_TEXT_LENGTH;
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
/*reserve appropriate area*/
lv_point_t size;
lv_txt_get_size(&size, part_draw_dsc.text, label_dsc.font, label_dsc.letter_space, label_dsc.line_space, LV_COORD_MAX,
LV_TEXT_FLAG_NONE);
/*set the area at some distance of the major tick len under of the tick*/
lv_area_t a;
a.x1 = (p2.x - size.x / 2);
a.x2 = (p2.x + size.x / 2);
if(sec_axis) {
a.y2 = p2.y - label_gap;
a.y1 = a.y2 - size.y;
}
else {
a.y1 = p2.y + label_gap;
a.y2 = a.y1 + size.y;
}
if(a.x2 >= obj->coords.x1 &&
a.x1 <= obj->coords.x2) {
lv_draw_label(draw_ctx, &label_dsc, &a, part_draw_dsc.text, NULL);
}
}
else {
part_draw_dsc.label_dsc = NULL;
part_draw_dsc.text = NULL;
part_draw_dsc.text_length = 0;
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
}
if(p1.x + line_dsc.width / 2 >= obj->coords.x1 &&
p2.x - line_dsc.width / 2 <= obj->coords.x2) {
lv_draw_line(draw_ctx, &line_dsc, &p1, &p2);
}
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &part_draw_dsc);
}
}
static void draw_axes(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx)
{
draw_y_ticks(obj, draw_ctx, LV_CHART_AXIS_PRIMARY_Y);
draw_y_ticks(obj, draw_ctx, LV_CHART_AXIS_SECONDARY_Y);
draw_x_ticks(obj, draw_ctx, LV_CHART_AXIS_PRIMARY_X);
draw_x_ticks(obj, draw_ctx, LV_CHART_AXIS_SECONDARY_X);
}
/**
* Get the nearest index to an X coordinate
* @param chart pointer to a chart object
* @param coord the coordination of the point relative to the series area.
* @return the found index
*/
static uint32_t get_index_from_x(lv_obj_t * obj, lv_coord_t x)
{
lv_chart_t * chart = (lv_chart_t *)obj;
lv_coord_t w = ((int32_t)lv_obj_get_content_width(obj) * chart->zoom_x) >> 8;
lv_coord_t pad_left = lv_obj_get_style_pad_left(obj, LV_PART_MAIN);
x -= pad_left;
if(x < 0) return 0;
if(x > w) return chart->point_cnt - 1;
if(chart->type == LV_CHART_TYPE_LINE) return (x * (chart->point_cnt - 1) + w / 2) / w;
if(chart->type == LV_CHART_TYPE_BAR) return (x * chart->point_cnt) / w;
return 0;
}
static void invalidate_point(lv_obj_t * obj, uint16_t i)
{
lv_chart_t * chart = (lv_chart_t *)obj;
if(i >= chart->point_cnt) return;
lv_coord_t w = ((int32_t)lv_obj_get_content_width(obj) * chart->zoom_x) >> 8;
lv_coord_t scroll_left = lv_obj_get_scroll_left(obj);
/*In shift mode the whole chart changes so the whole object*/
if(chart->update_mode == LV_CHART_UPDATE_MODE_SHIFT) {
lv_obj_invalidate(obj);
return;
}
if(chart->type == LV_CHART_TYPE_LINE) {
lv_coord_t bwidth = lv_obj_get_style_border_width(obj, LV_PART_MAIN);
lv_coord_t pleft = lv_obj_get_style_pad_left(obj, LV_PART_MAIN);
lv_coord_t x_ofs = obj->coords.x1 + pleft + bwidth - scroll_left;
lv_coord_t line_width = lv_obj_get_style_line_width(obj, LV_PART_ITEMS);
lv_coord_t point_w = lv_obj_get_style_width(obj, LV_PART_INDICATOR);
lv_area_t coords;
lv_area_copy(&coords, &obj->coords);
coords.y1 -= line_width + point_w;
coords.y2 += line_width + point_w;
if(i < chart->point_cnt - 1) {
coords.x1 = ((w * i) / (chart->point_cnt - 1)) + x_ofs - line_width - point_w;
coords.x2 = ((w * (i + 1)) / (chart->point_cnt - 1)) + x_ofs + line_width + point_w;
lv_obj_invalidate_area(obj, &coords);
}
if(i > 0) {
coords.x1 = ((w * (i - 1)) / (chart->point_cnt - 1)) + x_ofs - line_width - point_w;
coords.x2 = ((w * i) / (chart->point_cnt - 1)) + x_ofs + line_width + point_w;
lv_obj_invalidate_area(obj, &coords);
}
}
else if(chart->type == LV_CHART_TYPE_BAR) {
lv_area_t col_a;
int32_t block_gap = ((int32_t)lv_obj_get_style_pad_column(obj,
LV_PART_MAIN) * chart->zoom_x) >> 8; /*Gap between the column on ~adjacent X*/
lv_coord_t block_w = (w + block_gap) / chart->point_cnt;
lv_coord_t x_act;
x_act = (int32_t)((int32_t)(block_w) * i) ;
x_act += obj->coords.x1 + lv_obj_get_style_pad_left(obj, LV_PART_MAIN);
lv_obj_get_coords(obj, &col_a);
col_a.x1 = x_act - scroll_left;
col_a.x2 = col_a.x1 + block_w;
col_a.x1 -= block_gap;
lv_obj_invalidate_area(obj, &col_a);
}
else if(chart->type == LV_CHART_TYPE_SCATTER) {
lv_obj_invalidate(obj);
}
else {
lv_obj_invalidate(obj);
}
}
static void new_points_alloc(lv_obj_t * obj, lv_chart_series_t * ser, uint32_t cnt, lv_coord_t ** a)
{
if((*a) == NULL) return;
lv_chart_t * chart = (lv_chart_t *) obj;
uint32_t point_cnt_old = chart->point_cnt;
uint32_t i;
if(ser->start_point != 0) {
lv_coord_t * new_points = lv_mem_alloc(sizeof(lv_coord_t) * cnt);
LV_ASSERT_MALLOC(new_points);
if(new_points == NULL) return;
if(cnt >= point_cnt_old) {
for(i = 0; i < point_cnt_old; i++) {
new_points[i] =
(*a)[(i + ser->start_point) % point_cnt_old]; /*Copy old contents to new array*/
}
for(i = point_cnt_old; i < cnt; i++) {
new_points[i] = LV_CHART_POINT_NONE; /*Fill up the rest with default value*/
}
}
else {
for(i = 0; i < cnt; i++) {
new_points[i] =
(*a)[(i + ser->start_point) % point_cnt_old]; /*Copy old contents to new array*/
}
}
/*Switch over pointer from old to new*/
lv_mem_free((*a));
(*a) = new_points;
}
else {
(*a) = lv_mem_realloc((*a), sizeof(lv_coord_t) * cnt);
LV_ASSERT_MALLOC((*a));
if((*a) == NULL) return;
/*Initialize the new points*/
if(cnt > point_cnt_old) {
for(i = point_cnt_old - 1; i < cnt; i++) {
(*a)[i] = LV_CHART_POINT_NONE;
}
}
}
}
lv_chart_tick_dsc_t * get_tick_gsc(lv_obj_t * obj, lv_chart_axis_t axis)
{
lv_chart_t * chart = (lv_chart_t *) obj;
switch(axis) {
case LV_CHART_AXIS_PRIMARY_Y:
return &chart->tick[0];
case LV_CHART_AXIS_PRIMARY_X:
return &chart->tick[1];
case LV_CHART_AXIS_SECONDARY_Y:
return &chart->tick[2];
case LV_CHART_AXIS_SECONDARY_X:
return &chart->tick[3];
default:
return NULL;
}
}
#endif
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