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lvgl/lv_objx/lv_chart.c

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/**
* @file lv_chart.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_conf.h"
#if USE_LV_CHART != 0
#include <lvgl/lv_objx/lv_chart.h>
#include "lvgl/lv_draw/lv_draw.h"
/*********************
* DEFINES
*********************/
#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
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static bool lv_chart_design(lv_obj_t* obj_dp, const area_t * mask_p, lv_design_mode_t mode);
static void lv_charts_init(void);
static void lv_chart_draw_div(lv_obj_t* obj_dp, const area_t * mask_p);
static void lv_chart_draw_lines(lv_obj_t* obj_dp, const area_t * mask_p);
static void lv_chart_draw_points(lv_obj_t* obj_dp, const area_t * mask_p);
static void lv_chart_draw_cols(lv_obj_t* obj_dp, const area_t * mask_p);
/**********************
* STATIC VARIABLES
**********************/
static lv_design_f_t ancestor_design_fp;
static lv_charts_t lv_charts_def;
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/*-----------------
* Create function
*-----------------*/
/**
* Create a chart background objects
* @param par_dp pointer to an object, it will be the parent of the new chart background
* @param copy_dp 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_dp, lv_obj_t * copy_dp)
{
/*Create the ancestor basic object*/
lv_obj_t * new_obj_dp = lv_rect_create(par_dp, copy_dp);
dm_assert(new_obj_dp);
/*Allocate the object type specific extended data*/
lv_chart_ext_t * ext_dp = lv_obj_alloc_ext(new_obj_dp, sizeof(lv_chart_ext_t));
dm_assert(ext_dp);
if(ancestor_design_fp == NULL) {
ancestor_design_fp = lv_obj_get_design_f(new_obj_dp);
}
ll_init(&ext_dp->dl_ll, sizeof(cord_t *));
ext_dp->dl_num = 0;
lv_obj_set_signal_f(new_obj_dp, lv_chart_signal);
lv_obj_set_design_f(new_obj_dp, lv_chart_design);
/*Init the new chart background object*/
if(copy_dp == NULL) {
ext_dp->type = LV_CHART_LINE;
lv_obj_set_style(new_obj_dp, lv_charts_get(LV_CHARTS_DEF, NULL));
ext_dp->ymin = LV_CHART_YMIN_DEF;
ext_dp->ymax = LV_CHART_YMAX_DEF;
ext_dp->hdiv_num = LV_CHART_HDIV_DEF;
ext_dp->vdiv_num = LV_CHART_VDIV_DEF;
ext_dp->pnum = LV_CHART_PNUM_DEF;
} else {
lv_chart_ext_t * ext_copy_dp = lv_obj_get_ext(copy_dp);
ext_dp->type = ext_copy_dp->type;
ext_dp->ymin = ext_copy_dp->ymin;
ext_dp->ymax = ext_copy_dp->ymax;
ext_dp->hdiv_num = ext_copy_dp->hdiv_num;
ext_dp->vdiv_num = ext_copy_dp->vdiv_num;
ext_dp->pnum = ext_copy_dp->pnum;
}
return new_obj_dp;
}
/**
* Signal function of the chart background
* @param obj_dp pointer to a chart background object
* @param sign a signal type from lv_signal_t enum
* @param param pointer to a signal specific variable
*/
bool lv_chart_signal(lv_obj_t* obj_dp, lv_signal_t sign, void * param)
{
bool valid;
/* Include the ancient signal function */
valid = lv_rect_signal(obj_dp, sign, param);
/* The object can be deleted so check its validity and then
* make the object specific signal handling */
if(valid != false) {
cord_t ** datal;
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
switch(sign) {
case LV_SIGNAL_CLEANUP:
LL_READ(ext_dp->dl_ll, datal) {
dm_free(*datal);
}
ll_clear(&ext_dp->dl_ll);
break;
default:
break;
}
}
return valid;
}
cord_t * lv_chart_add_dataline(lv_obj_t* obj_dp)
{
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
cord_t ** dl_dp = ll_ins_head(&ext_dp->dl_ll);
cord_t def = (ext_dp->ymax - ext_dp->ymin) >> 2; /*1/4 range as default value*/
if(dl_dp == NULL) return NULL;
*dl_dp = dm_alloc(sizeof(cord_t) * ext_dp->pnum);
uint16_t i;
cord_t * p_tmp = *dl_dp;
for(i = 0; i < ext_dp->pnum; i++) {
*p_tmp = def;
p_tmp++;
}
ext_dp->dl_num++;
return *dl_dp;
}
/**
* Refresh a chart if its data line has changed
* @param obj_dp pionter to chart object
*/
void lv_chart_refr(lv_obj_t * obj_dp)
{
lv_obj_inv(obj_dp);
}
/*=====================
* Setter functions
*====================*/
/**
* Set the number of horizontal and vertical division lines
* @param obj_dp pointer to a graph background object
* @param hdiv number of horizontal division lines
* @param vdiv number of vertical division lines
*/
void lv_chart_set_hvdiv(lv_obj_t * obj_dp, uint8_t hdiv, uint8_t vdiv)
{
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
ext_dp->hdiv_num = hdiv;
ext_dp->vdiv_num = vdiv;
lv_obj_inv(obj_dp);
}
/**
* Set the minimal and maximal x and y values
* @param obj_dp pointer to a graph background object
* @param xmin x minimum value
* @param xmax x maximum value
* @param ymin y minimum value
* @param ymax y maximum value
*/
void lv_chart_set_range(lv_obj_t * obj_dp, cord_t ymin, cord_t ymax)
{
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
ext_dp->ymin = ymin;
ext_dp->ymax = ymax;
lv_chart_refr(obj_dp);
}
/**
* Set a new type for a chart
* @param obj_dp pointer to a chart object
* @param type ew type of the chart (from 'lv_chart_type_t' enum)
*/
void lv_chart_set_type(lv_obj_t * obj_dp, lv_chart_type_t type)
{
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
ext_dp->type = type;
lv_chart_refr(obj_dp);
}
/**
* Set the number of points on a data line on a chart
* @param obj_dp pointer r to chart object
* @param pnum new number of points on the data lines
*/
void lv_chart_set_pnum(lv_obj_t * obj_dp, uint16_t pnum)
{
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
cord_t ** y_data;
if(pnum < 1) pnum = 1;
LL_READ_BACK(ext_dp->dl_ll, y_data) {
*y_data = dm_realloc(*y_data, sizeof(cord_t) * pnum);
}
ext_dp->pnum = pnum;
lv_chart_refr(obj_dp);
}
/**
* Shift all data right and set the most right data on a data line
* @param obj_dp pointer to chart object
* @param dl_p pointer to a data line on 'obj_dp'
* @param y the new value of the most right data
*/
void lv_chart_set_next(lv_obj_t * obj_dp, cord_t * dl_p, cord_t y)
{
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
uint16_t i;
for(i = 0; i < ext_dp->pnum - 1; i++) {
dl_p[i] = dl_p[i + 1];
}
dl_p[ext_dp->pnum - 1] = y;
lv_chart_refr(obj_dp);
}
/*=====================
* Getter functions
*====================*/
/**
* Return with a pointer to a built-in style and/or copy it to a variable
* @param style a style name from lv_charts_builtin_t enum
* @param copy_p copy the style to this variable. (NULL if unused)
* @return pointer to an lv_charts_t style
*/
lv_charts_t * lv_charts_get(lv_charts_builtin_t style, lv_charts_t * copy_p)
{
static bool style_inited = false;
/*Make the style initialization if it is not done yet*/
if(style_inited == false) {
lv_charts_init();
style_inited = true;
}
lv_charts_t * style_p;
switch(style) {
case LV_CHARTS_DEF:
style_p = &lv_charts_def;
break;
default:
style_p = &lv_charts_def;
}
if(copy_p != NULL) {
if(style_p != NULL) memcpy(copy_p, style_p, sizeof(lv_charts_t));
else memcpy(copy_p, &lv_charts_def, sizeof(lv_charts_t));
}
return style_p;
}
/**
* Get the type of a chart
* @param obj_dp pointer to chart object
* @return type of the chart (from 'lv_chart_t' enum)
*/
lv_chart_type_t lv_chart_get_type(lv_obj_t * obj_dp)
{
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
return ext_dp->type;
}
/**
* Get the data point number per data line on chart
* @param obj_dp pointer to chart object
* @return point number on each data line
*/
uint16_t lv_chart_get_pnum(lv_obj_t * obj_dp)
{
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
return ext_dp->pnum;
}
/**********************
* STATIC FUNCTIONS
**********************/
/**
* Handle the drawing related tasks of the chart backgrounds
* @param obj_dp 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* obj_dp, const area_t * mask_p, 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_fp(obj_dp, mask_p, mode);
} else if(mode == LV_DESIGN_DRAW_MAIN) {
/*Draw the rectangle ancient*/
ancestor_design_fp(obj_dp, mask_p, mode);
/*Draw the object*/
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
lv_chart_draw_div(obj_dp, mask_p);
switch(ext_dp->type) {
case LV_CHART_LINE:
lv_chart_draw_lines(obj_dp, mask_p);
break;
case LV_CHART_COL:
lv_chart_draw_cols(obj_dp, mask_p);
break;
case LV_CHART_POINT:
lv_chart_draw_points(obj_dp, mask_p);
break;
default:
break;
}
}
return true;
}
/**
* Draw the division lines on chart background
* @param obj_dp pointer to chart object
* @param mask_p mask, inherited from the design function
*/
static void lv_chart_draw_div(lv_obj_t* obj_dp, const area_t * mask_p)
{
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
lv_charts_t * style_p = lv_obj_get_style(obj_dp);
uint8_t div_i;
point_t p1;
point_t p2;
cord_t w = lv_obj_get_width(obj_dp);
cord_t h = lv_obj_get_height(obj_dp);
opa_t div_opa = (uint16_t)lv_obj_get_opa(obj_dp) * style_p->div_line_opa / 100;
cord_t x_ofs = lv_obj_get_x(obj_dp);
cord_t y_ofs = lv_obj_get_y(obj_dp);
p1.x = 0 + x_ofs;
p2.x = w + x_ofs;
for(div_i = 1; div_i <= ext_dp->hdiv_num; div_i ++) {
p1.y = (int32_t)((int32_t)h * div_i) / (ext_dp->hdiv_num + 1);
p1.y += y_ofs;
p2.y = p1.y;
lv_draw_line(&p1, &p2, mask_p, &style_p->div_lines, div_opa);
}
p1.y = 0 + y_ofs;
p2.y = h + y_ofs;
for(div_i = 1; div_i <= ext_dp->vdiv_num; div_i ++) {
p1.x = (int32_t)((int32_t)w * div_i) / (ext_dp->vdiv_num + 1);
p1.x += x_ofs;
p2.x = p1.x;
lv_draw_line(&p1, &p2, mask_p, &style_p->div_lines, div_opa);
}
}
/**
* Draw the data lines as lines on a chart
* @param obj_dp pointer to chart object
* @param mask_p mask, inherited from the design function
*/
static void lv_chart_draw_lines(lv_obj_t* obj_dp, const area_t * mask_p)
{
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
lv_charts_t * style_p = lv_obj_get_style(obj_dp);
uint8_t i;
point_t p1;
point_t p2;
cord_t w = lv_obj_get_width(obj_dp);
cord_t h = lv_obj_get_height(obj_dp);
opa_t opa = (uint16_t)lv_obj_get_opa(obj_dp) * style_p->data_opa / 100;
cord_t x_ofs = lv_obj_get_x(obj_dp);
cord_t y_ofs = lv_obj_get_y(obj_dp);
int32_t y_tmp;
cord_t ** y_data;
uint8_t dl_cnt = 0;
lv_lines_t lines;
lv_lines_get(LV_LINES_CHART, &lines);
/*Go through all data lines*/
LL_READ_BACK(ext_dp->dl_ll, y_data) {
lines.objs.color = style_p->color[dl_cnt];
lines.width = style_p->width;
p1.x = 0 + x_ofs;
p2.x = 0 + x_ofs;
y_tmp = (int32_t)((int32_t) (*y_data)[0] - ext_dp->ymin) * h;
y_tmp = y_tmp / (ext_dp->ymax - ext_dp->ymin);
p2.y = h - y_tmp + y_ofs;
for(i = 1; i < ext_dp->pnum; i ++) {
p1.x = p2.x;
p1.y = p2.y;
p2.x = (w / (ext_dp->pnum - 1)) * i + x_ofs;
y_tmp = (int32_t)((int32_t) (*y_data)[i] - ext_dp->ymin) * h;
y_tmp = y_tmp / (ext_dp->ymax - ext_dp->ymin);
p2.y = h - y_tmp + y_ofs;
lv_draw_line(&p1, &p2, mask_p, &lines, opa);
}
dl_cnt++;
}
}
/**
* Draw the data lines as points on a chart
* @param obj_dp pointer to chart object
* @param mask_p mask, inherited from the design function
*/
static void lv_chart_draw_points(lv_obj_t* obj_dp, const area_t * mask_p)
{
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
lv_charts_t * style_p = lv_obj_get_style(obj_dp);
uint8_t i;
area_t cir_a;
cord_t w = lv_obj_get_width(obj_dp);
cord_t h = lv_obj_get_height(obj_dp);
opa_t opa = (uint16_t)lv_obj_get_opa(obj_dp) * style_p->data_opa / 100;
cord_t x_ofs = lv_obj_get_x(obj_dp);
cord_t y_ofs = lv_obj_get_y(obj_dp);
int32_t y_tmp;
cord_t ** y_data;
uint8_t dl_cnt = 0;
lv_rects_t rects;
cord_t rad = style_p->width;
lv_rects_get(LV_RECTS_DEF, &rects);
rects.bwidth = 0;
rects.empty = 0;
rects.round = LV_RECT_CIRCLE;
/*Go through all data lines*/
LL_READ_BACK(ext_dp->dl_ll, y_data) {
rects.objs.color = style_p->color[dl_cnt];
rects.gcolor = color_mix(COLOR_BLACK, style_p->color[dl_cnt], style_p->dark_eff);
for(i = 0; i < ext_dp->pnum; i ++) {
cir_a.x1 = (w / (ext_dp->pnum - 1)) * i + x_ofs;
cir_a.x2 = cir_a.x1 + rad;
cir_a.x1 -= rad;
y_tmp = (int32_t)((int32_t) (*y_data)[i] - ext_dp->ymin) * h;
y_tmp = y_tmp / (ext_dp->ymax - ext_dp->ymin);
cir_a.y1 = h - y_tmp + y_ofs;
cir_a.y2 = cir_a.y1 + rad;
cir_a.y1 -= rad;
lv_draw_rect(&cir_a, mask_p, &rects, opa);
}
dl_cnt++;
}
}
/**
* Draw the data lines as columns on a chart
* @param obj_dp pointer to chart object
* @param mask_p mask, inherited from the design function
*/
static void lv_chart_draw_cols(lv_obj_t* obj_dp, const area_t * mask_p)
{
lv_chart_ext_t * ext_dp = lv_obj_get_ext(obj_dp);
lv_charts_t * style_p = lv_obj_get_style(obj_dp);
uint8_t i;
area_t col_a;
area_t col_mask;
bool mask_ret;
cord_t w = lv_obj_get_width(obj_dp);
cord_t h = lv_obj_get_height(obj_dp);
opa_t opa = (uint16_t)lv_obj_get_opa(obj_dp) * style_p->data_opa / 100;
int32_t y_tmp;
cord_t ** y_data;
uint8_t dl_cnt = 0;
lv_rects_t rects;
cord_t x_ofs = w / ((ext_dp->dl_num + 1) * ext_dp->pnum) / 2; /*Shift with a half col.*/
lv_rects_get(LV_RECTS_DEF, &rects);
rects.bwidth = 0;
rects.empty = 0;
rects.round = 0;
col_a.y2 = obj_dp->cords.y2;
/*Go through all data lines*/
LL_READ_BACK(ext_dp->dl_ll, y_data) {
rects.objs.color = style_p->color[dl_cnt];
rects.gcolor = color_mix(COLOR_BLACK, style_p->color[dl_cnt], style_p->dark_eff);
for(i = 0; i < ext_dp->pnum; i ++) {
/*Calculate the x coordinates. Suppose (dl_num + 1) * pnum columns */
col_a.x1 = (int32_t)((int32_t)w * (i * (ext_dp->dl_num + 1) + dl_cnt)) /
(ext_dp->pnum * (ext_dp->dl_num + 1)) + obj_dp->cords.x1;
col_a.x2 = (int32_t)((int32_t)w * (i * (ext_dp->dl_num + 1) + dl_cnt + 1 )) /
(ext_dp->pnum * (ext_dp->dl_num + 1)) + obj_dp->cords.x1 - 1;
col_a.x1 += x_ofs;
col_a.x2 += x_ofs;
y_tmp = (int32_t)((int32_t) (*y_data)[i] - ext_dp->ymin) * h;
y_tmp = y_tmp / (ext_dp->ymax - ext_dp->ymin);
col_a.y1 = h - y_tmp + obj_dp->cords.y1;
mask_ret = area_union(&col_mask, mask_p, &col_a);
if(mask_ret != false) {
lv_draw_rect(&obj_dp->cords, &col_mask, &rects, opa);
}
}
dl_cnt++;
}
}
/**
* Initialize the chart styles
*/
static void lv_charts_init(void)
{
/*Default style*/
/* Background */
lv_rects_get(LV_RECTS_DEF, &lv_charts_def.bg_rects);
lv_charts_def.bg_rects.objs.color = COLOR_MAKE(0x60, 0x80, 0xA0);
lv_charts_def.bg_rects.gcolor = COLOR_WHITE;
lv_charts_def.bg_rects.bcolor = COLOR_BLACK;
/* Div. line */
lv_lines_get(LV_LINES_DECOR, &lv_charts_def.div_lines);
lv_charts_def.div_lines.width = 1 * LV_STYLE_MULT;
lv_charts_def.div_lines.objs.color = COLOR_BLACK;
lv_charts_def.div_line_opa = OPA_COVER;
/*Data lines*/
lv_charts_def.width = 3 * LV_STYLE_MULT;
lv_charts_def.data_opa = 100;
lv_charts_def.dark_eff = 150;
lv_charts_def.color[0] = COLOR_RED;
lv_charts_def.color[1] = COLOR_LIME;
lv_charts_def.color[2] = COLOR_BLUE;
lv_charts_def.color[3] = COLOR_MAGENTA;
lv_charts_def.color[4] = COLOR_CYAN;
lv_charts_def.color[5] = COLOR_YELLOW;
lv_charts_def.color[6] = COLOR_WHITE;
lv_charts_def.color[7] = COLOR_GRAY;
}
#endif
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