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FIXED/UPDATED: Add support for chart axes ticks and value labels / chart label.

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This commit is contained in:
user-0
2019-03-23 22:21:02 +02:00
parent 0150586db7
commit db4f4f0360
3 changed files with 59 additions and 69 deletions
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1
lv_conf_template.h
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@@ -257,6 +257,7 @@ typedef void * lv_obj_user_data_t; /*Declare the type of the user data
/*Chart (dependencies: -)*/
#define LV_USE_CHART 1
#define LV_CHART_AXIS_TICK_LABEL_MAX_LEN 16
/*Table (dependencies: lv_label)*/
#define LV_USE_TABLE 1

85
src/lv_objx/lv_chart.c
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@@ -20,8 +20,6 @@
#define LV_CHART_HDIV_DEF 3
#define LV_CHART_VDIV_DEF 5
#define LV_CHART_PNUM_DEF 10
#define LV_CHART_AXIS_MARGIN 50
#define LV_CHART_AXIS_TICK_LABEL_MAX_LEN 16
#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
@@ -90,6 +88,7 @@ lv_obj_t * lv_chart_create(lv_obj_t * par, const lv_obj_t * copy)
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));
@@ -120,8 +119,9 @@ lv_obj_t * lv_chart_create(lv_obj_t * par, const lv_obj_t * copy)
ext->vdiv_cnt = ext_copy->vdiv_cnt;
ext->point_cnt = ext_copy->point_cnt;
ext->series.opa = ext_copy->series.opa;
ext->x_axis = ext_copy->x_axis;
ext->y_axis = ext_copy->y_axis;
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));
/*Refresh the style with new signal function*/
lv_obj_refresh_style(new_chart);
@@ -401,14 +401,13 @@ void lv_chart_set_next(lv_obj_t * chart, lv_chart_series_t * ser, lv_coord_t y)
}
/**
* Set the x-axis label of a chart
* @param chart pointer to a chart object
* @param text pointer to the label text (not copied)
* Set the margin around the chart, used for axes value and labels
* @param margin value of the margin
*/
void lv_chart_set_label(lv_obj_t* chart, const char* text)
void lv_chart_set_margin(lv_obj_t* chart, uint16_t margin)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
ext->x_axis.label = text;
ext->margin = margin;
lv_obj_refresh_ext_size(chart);
}
@@ -418,32 +417,37 @@ void lv_chart_set_label(lv_obj_t* chart, const char* text)
* @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 step in ticks between two value labels
* @param label label to show for this axis (only X)
* @param major_tick_len the length of the major tick, AUTO if 0
* @param minor_tick_len the length of the minor tick, AUTO if 0
* @param options extra options
*/
void lv_chart_set_x_ticks( lv_obj_t* chart,
const char* list_of_values,
uint8_t num_tick_marks,
const char* label,
uint8_t major_tick_len,
uint8_t minor_tick_len,
lv_chart_axis_options_t options)
{
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.label = label;
ext->x_axis.major_tick_len = major_tick_len;
ext->x_axis.minor_tick_len = minor_tick_len;
ext->x_axis.options = options;
}
void lv_chart_set_y_ticks( lv_obj_t* chart,
const char* list_of_values,
uint8_t num_tick_marks,
const char* label,
uint8_t major_tick_len,
uint8_t minor_tick_len,
lv_chart_axis_options_t options)
{
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.label = label;
ext->y_axis.major_tick_len = major_tick_len;
ext->y_axis.minor_tick_len = minor_tick_len;
ext->y_axis.options = options;
}
@@ -565,6 +569,7 @@ static bool lv_chart_design(lv_obj_t * chart, const lv_area_t * mask, lv_design_
static lv_res_t lv_chart_signal(lv_obj_t * chart, lv_signal_t sign, void * param)
{
lv_res_t res;
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
/* Include the ancient signal function */
res = ancestor_signal(chart, sign, param);
@@ -572,7 +577,6 @@ static lv_res_t lv_chart_signal(lv_obj_t * chart, lv_signal_t sign, void * param
if(sign == LV_SIGNAL_CLEANUP) {
lv_coord_t ** datal;
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
LV_LL_READ(ext->series_ll, datal) {
lv_mem_free(*datal);
}
@@ -585,15 +589,8 @@ static lv_res_t lv_chart_signal(lv_obj_t * chart, lv_signal_t sign, void * param
}
buf->type[i] = "lv_chart";
} else if(sign == LV_SIGNAL_REFR_EXT_SIZE) {
/*Provide extra px draw area around the chart if needed*/
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) ||
(ext->y_axis.list_of_values != NULL || ext->y_axis.num_tick_marks != 0) ||
(ext->x_axis.label == NULL) )
{ /* Reserve some space for axis ticks and labels, predefined by the user */
chart->ext_size += LV_CHART_AXIS_MARGIN;
}
/*Provide extra px draw area around the chart*/
chart->ext_size = ext->margin;
}
return res;
@@ -977,8 +974,15 @@ static void lv_chart_draw_y_ticks(lv_obj_t * chart, const lv_area_t * mask)
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->y_axis.major_tick_len == 0)
major_tick_len = (int32_t)w * LV_CHART_AXIS_MAJOR_TICK_LEN_COE;
else
major_tick_len = ext->y_axis.major_tick_len;
if(ext->y_axis.minor_tick_len == 0)
minor_tick_len = major_tick_len * LV_CHART_AXIS_MINOR_TICK_LEN_COE;
else
minor_tick_len = ext->y_axis.minor_tick_len;
/* count the '\n'-s to determine the number of options */
list_index = 0;
@@ -1084,8 +1088,15 @@ static void lv_chart_draw_x_ticks(lv_obj_t * chart, const lv_area_t * mask)
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 == 0)
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 == 0)
minor_tick_len = major_tick_len * LV_CHART_AXIS_MINOR_TICK_LEN_COE;
else
minor_tick_len = ext->x_axis.minor_tick_len;
/* count the '\n'-s to determine the number of options */
list_index = 0;
@@ -1167,35 +1178,9 @@ static void lv_chart_draw_x_ticks(lv_obj_t * chart, const lv_area_t * mask)
}
}
static void lv_chart_draw_x_axis_label(lv_obj_t * chart, const lv_area_t * mask)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
if (ext->x_axis.label != NULL)
{
const lv_style_t * style = lv_obj_get_style(chart);
lv_opa_t opa_scale = lv_obj_get_opa_scale(chart);
lv_coord_t w = lv_obj_get_width(chart);
lv_point_t size;
lv_txt_get_size(&size, ext->x_axis.label, style->text.font, style->text.letter_space, style->text.line_space, LV_COORD_MAX, LV_TXT_FLAG_CENTER);
lv_area_t label_area;
label_area.x1 = chart->coords.x1 + w/2 - size.x/2;
label_area.y1 = chart->coords.y1 - LV_CHART_AXIS_TO_LABEL_DISTANCE - (style->text.font->h_px / 4) - size.y/2;
label_area.x2 = label_area.x1 + size.x;
label_area.y2 = label_area.y1 + size.y/2;
lv_draw_label(&label_area, mask, style, opa_scale, ext->x_axis.label, LV_TXT_FLAG_CENTER, NULL);
}
}
static void lv_chart_draw_axes(lv_obj_t * chart, const lv_area_t * mask)
{
lv_chart_draw_y_ticks(chart, mask);
lv_chart_draw_x_ticks(chart, mask);
lv_chart_draw_x_axis_label(chart, mask);
}
#endif

20
src/lv_objx/lv_chart.h
View File

@@ -62,8 +62,9 @@ typedef struct
{
const char* list_of_values;
uint8_t num_tick_marks;
const char* label;
lv_chart_axis_options_t options;
uint8_t major_tick_len;
uint8_t minor_tick_len;
} lv_chart_axis_cfg_t;
/*Data of chart */
@@ -80,6 +81,7 @@ typedef struct
lv_chart_type_t type; /*Line, column or point chart (from 'lv_chart_type_t')*/
lv_chart_axis_cfg_t y_axis;
lv_chart_axis_cfg_t x_axis;
uint16_t margin;
struct {
lv_coord_t width; /*Line width or point radius*/
uint8_t num; /*Number of data lines in dl_ll*/
@@ -211,11 +213,10 @@ static inline void lv_chart_set_style(lv_obj_t *chart, lv_style_t *style)
}
/**
* Set the x-axis label of a chart
* @param chart pointer to a chart object
* @param text pointer to the label text (not copied)
* Set the margin around the chart, used for axes value and labels
* @param margin value of the margin
*/
void lv_chart_set_label(lv_obj_t* chart, const char* text);
void lv_chart_set_margin(lv_obj_t* chart, uint16_t margin);
/**
* Set the x/y-axis ticks of a chart
@@ -223,19 +224,22 @@ void lv_chart_set_label(lv_obj_t* chart, const char* text);
* @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 step in ticks between two value labels
* @param label label to show for this axis (only X)
* @param major_tick_len the length of the major tick, AUTO if 0
* @param minor_tick_len the length of the minor tick, AUTO if 0
* @param options extra options
*/
void lv_chart_set_x_ticks( lv_obj_t* chart,
const char* list_of_values,
uint8_t num_tick_marks,
const char* label,
uint8_t major_tick_len,
uint8_t minor_tick_len,
lv_chart_axis_options_t options);
void lv_chart_set_y_ticks( lv_obj_t* chart,
const char* list_of_values,
uint8_t num_tick_marks,
const char* label,
uint8_t major_tick_len,
uint8_t minor_tick_len,
lv_chart_axis_options_t options);
/*=====================