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lvgl/src/lv_widgets/lv_arc.c

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/**
* @file lv_arc.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_arc.h"
#if LV_USE_ARC != 0
#include "../lv_core/lv_debug.h"
#include "../lv_misc/lv_math.h"
#include "../lv_draw/lv_draw_arc.h"
#include "../lv_themes/lv_theme.h"
/*********************
* DEFINES
*********************/
#define LV_OBJX_NAME "lv_arc"
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static lv_design_res_t lv_arc_design(lv_obj_t * arc, const lv_area_t * clip_area, lv_design_mode_t mode);
static lv_res_t lv_arc_signal(lv_obj_t * arc, lv_signal_t sign, void * param);
static lv_style_list_t * lv_arc_get_style(lv_obj_t * arc, uint8_t part);
static void inv_arc_area(lv_obj_t * arc, uint16_t start_angle, uint16_t end_angle);
/**********************
* STATIC VARIABLES
**********************/
static lv_signal_cb_t ancestor_signal;
static lv_design_cb_t ancestor_design;
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Create a arc object
* @param par pointer to an object, it will be the parent of the new arc
* @param copy pointer to a arc object, if not NULL then the new object will be copied from it
* @return pointer to the created arc
*/
lv_obj_t * lv_arc_create(lv_obj_t * par, const lv_obj_t * copy)
{
LV_LOG_TRACE("arc create started");
/*Create the ancestor of arc*/
lv_obj_t * arc = lv_obj_create(par, copy);
LV_ASSERT_MEM(arc);
if(arc == NULL) return NULL;
/*Allocate the arc type specific extended data*/
lv_arc_ext_t * ext = lv_obj_allocate_ext_attr(arc, sizeof(lv_arc_ext_t));
LV_ASSERT_MEM(ext);
if(ext == NULL) {
lv_obj_del(arc);
return NULL;
}
if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_cb(arc);
if(ancestor_design == NULL) ancestor_design = lv_obj_get_design_cb(arc);
/*Initialize the allocated 'ext' */
ext->rotation_angle = 0;
ext->bg_angle_start = 135;
ext->bg_angle_end = 45;
ext->arc_angle_start = 135;
ext->arc_angle_end = 270;
lv_style_list_init(&ext->style_arc);
lv_obj_set_size(arc, LV_DPI, LV_DPI);
/*The signal and design functions are not copied so set them here*/
lv_obj_set_signal_cb(arc, lv_arc_signal);
lv_obj_set_design_cb(arc, lv_arc_design);
/*Init the new arc arc*/
if(copy == NULL) {
lv_theme_apply(arc, LV_THEME_ARC);
}
/*Copy an existing arc*/
else {
lv_arc_ext_t * copy_ext = lv_obj_get_ext_attr(copy);
ext->arc_angle_start = copy_ext->arc_angle_start;
ext->arc_angle_end = copy_ext->arc_angle_end;
ext->bg_angle_start = copy_ext->bg_angle_start;
ext->bg_angle_end = copy_ext->bg_angle_end;
lv_style_list_copy(&ext->style_arc, &copy_ext->style_arc);
/*Refresh the style with new signal function*/
lv_obj_refresh_style(arc, LV_STYLE_PROP_ALL);
}
LV_LOG_INFO("arc created");
return arc;
}
/*======================
* Add/remove functions
*=====================*/
/*
* New object specific "add" or "remove" functions come here
*/
/*=====================
* Setter functions
*====================*/
/**
* Set the start angle of an arc. 0 deg: right, 90 bottom, etc.
* @param arc pointer to an arc object
* @param start the start angle [0..360]
*/
void lv_arc_set_start_angle(lv_obj_t * arc, uint16_t start)
{
LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
if(start > 360) start -= 360;
/*Too large move, the whole arc need to be invalidated anyway*/
if(LV_MATH_ABS(start - ext->arc_angle_start) >= 180) {
lv_obj_invalidate(arc);
}
/*Only a smaller incremental move*/
else if(ext->arc_angle_start > ext->arc_angle_end && start > ext->arc_angle_end) {
inv_arc_area(arc, LV_MATH_MIN(ext->arc_angle_start, start), LV_MATH_MAX(ext->arc_angle_start, start));
}
/*Only a smaller incremental move*/
else if(ext->arc_angle_start < ext->arc_angle_end && start < ext->arc_angle_end) {
inv_arc_area(arc, LV_MATH_MIN(ext->arc_angle_start, start), LV_MATH_MAX(ext->arc_angle_start, start));
}
/*Crossing the start angle makes the whole arc change*/
else {
lv_obj_invalidate(arc);
}
ext->arc_angle_start = start;
}
/**
* Set the start angle of an arc. 0 deg: right, 90 bottom, etc.
* @param arc pointer to an arc object
* @param start the start angle [0..360]
*/
void lv_arc_set_end_angle(lv_obj_t * arc, uint16_t end)
{
LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
if(end > (ext->arc_angle_start + 360)) end = ext->arc_angle_start + 360;
/*Too large move, the whole arc need to be invalidated anyway*/
if(LV_MATH_ABS(end - ext->arc_angle_end) >= 180) {
lv_obj_invalidate(arc);
}
/*Only a smaller incremental move*/
else if(ext->arc_angle_end > ext->arc_angle_start && end > ext->arc_angle_start) {
inv_arc_area(arc, LV_MATH_MIN(ext->arc_angle_end, end), LV_MATH_MAX(ext->arc_angle_end, end));
}
/*Only a smaller incremental move*/
else if(ext->arc_angle_end < ext->arc_angle_start && end < ext->arc_angle_start) {
inv_arc_area(arc, LV_MATH_MIN(ext->arc_angle_end, end), LV_MATH_MAX(ext->arc_angle_end, end));
}
/*Crossing the end angle makes the whole arc change*/
else {
lv_obj_invalidate(arc);
}
ext->arc_angle_end = end;
}
/**
* Set the start and end angles
* @param arc pointer to an arc object
* @param start the start angle
* @param end the end angle
*/
void lv_arc_set_angles(lv_obj_t * arc, uint16_t start, uint16_t end)
{
LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
if(start > 360) start -= 360;
if(end > (start + 360)) end = start + 360;
inv_arc_area(arc, ext->arc_angle_start, ext->arc_angle_end);
ext->arc_angle_start = start;
ext->arc_angle_end = end;
inv_arc_area(arc, ext->arc_angle_start, ext->arc_angle_end);
}
/**
* Set the start angle of an arc background. 0 deg: right, 90 bottom, etc.
* @param arc pointer to an arc object
* @param start the start angle
*/
void lv_arc_set_bg_start_angle(lv_obj_t * arc, uint16_t start)
{
LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
if(start > 360) start -= 360;
/*Too large move, the whole arc need to be invalidated anyway*/
if(LV_MATH_ABS(start - ext->bg_angle_start) >= 180) {
lv_obj_invalidate(arc);
}
/*Only a smaller incremental move*/
else if(ext->bg_angle_start > ext->bg_angle_end && start > ext->bg_angle_end) {
inv_arc_area(arc, LV_MATH_MIN(ext->bg_angle_start, start), LV_MATH_MAX(ext->bg_angle_start, start));
}
/*Only a smaller incremental move*/
else if(ext->bg_angle_start < ext->bg_angle_end && start < ext->bg_angle_end) {
inv_arc_area(arc, LV_MATH_MIN(ext->bg_angle_start, start), LV_MATH_MAX(ext->bg_angle_start, start));
}
/*Crossing the start angle makes the whole arc change*/
else {
lv_obj_invalidate(arc);
}
ext->bg_angle_start = start;
}
/**
* Set the start angle of an arc background. 0 deg: right, 90 bottom etc.
* @param arc pointer to an arc object
* @param end the end angle
*/
void lv_arc_set_bg_end_angle(lv_obj_t * arc, uint16_t end)
{
LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
if(end > (ext->bg_angle_start + 360)) end = ext->bg_angle_start + 360;
/*Too large move, the whole arc need to be invalidated anyway*/
if(LV_MATH_ABS(end - ext->bg_angle_end) >= 180) {
lv_obj_invalidate(arc);
}
/*Only a smaller incremental move*/
else if(ext->bg_angle_end > ext->bg_angle_start && end > ext->bg_angle_start) {
inv_arc_area(arc, LV_MATH_MIN(ext->bg_angle_end, end), LV_MATH_MAX(ext->bg_angle_end, end));
}
/*Only a smaller incremental move*/
else if(ext->bg_angle_end < ext->bg_angle_start && end < ext->bg_angle_start) {
inv_arc_area(arc, LV_MATH_MIN(ext->bg_angle_end, end), LV_MATH_MAX(ext->bg_angle_end, end));
}
/*Crossing the end angle makes the whole arc change*/
else {
lv_obj_invalidate(arc);
}
ext->bg_angle_end = end;
}
/**
* Set the start and end angles of the arc background
* @param arc pointer to an arc object
* @param start the start angle
* @param end the end angle
*/
void lv_arc_set_bg_angles(lv_obj_t * arc, uint16_t start, uint16_t end)
{
LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
if(start > 360) start -= 360;
if(end > (start + 360)) end = start + 360;
inv_arc_area(arc, ext->bg_angle_start, ext->bg_angle_end);
ext->bg_angle_start = start;
ext->bg_angle_end = end;
inv_arc_area(arc, ext->bg_angle_start, ext->bg_angle_end);
}
/**
* Set the rotation for the whole arc
* @param arc pointer to an arc object
* @param rotation_angle rotation angle
*/
void lv_arc_set_rotation(lv_obj_t * arc, uint16_t rotation_angle)
{
LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
ext->rotation_angle = rotation_angle;
lv_obj_invalidate(arc);
}
/*=====================
* Getter functions
*====================*/
/**
* Get the start angle of an arc.
* @param arc pointer to an arc object
* @return the start angle [0..360]
*/
uint16_t lv_arc_get_angle_start(lv_obj_t * arc)
{
LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
return ext->arc_angle_start;
}
/**
* Get the end angle of an arc.
* @param arc pointer to an arc object
* @return the end angle [0..360]
*/
uint16_t lv_arc_get_angle_end(lv_obj_t * arc)
{
LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
return ext->arc_angle_end;
}
/**
* Get the start angle of an arc background.
* @param arc pointer to an arc object
* @return the start angle [0..360]
*/
uint16_t lv_arc_get_bg_angle_start(lv_obj_t * arc)
{
LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
return ext->bg_angle_start;
}
/**
* Get the end angle of an arc background.
* @param arc pointer to an arc object
* @return the end angle [0..360]
*/
uint16_t lv_arc_get_bg_angle_end(lv_obj_t * arc)
{
LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
return ext->bg_angle_end;
}
/*=====================
* Other functions
*====================*/
/*
* New object specific "other" functions come here
*/
/**********************
* STATIC FUNCTIONS
**********************/
/**
* Handle the drawing related tasks of the arcs
* @param arc pointer to an object
* @param clip_area the object will be drawn only in this area
* @param mode LV_DESIGN_COVER_CHK: only check if the object fully covers the 'mask_p' area
* (return 'true' if yes)
* LV_DESIGN_DRAW: draw the object (always return 'true')
* LV_DESIGN_DRAW_POST: drawing after every children are drawn
* @param return an element of `lv_design_res_t`
*/
static lv_design_res_t lv_arc_design(lv_obj_t * arc, const lv_area_t * clip_area, lv_design_mode_t mode)
{
/*Return false if the object is not covers the mask_p area*/
if(mode == LV_DESIGN_COVER_CHK) {
return LV_DESIGN_RES_NOT_COVER;
}
/*Draw the object*/
else if(mode == LV_DESIGN_DRAW_MAIN) {
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
lv_draw_rect_dsc_t bg_dsc;
lv_draw_rect_dsc_init(&bg_dsc);
lv_obj_init_draw_rect_dsc(arc, LV_ARC_PART_BG, &bg_dsc);
lv_draw_rect(&arc->coords, clip_area, &bg_dsc);
lv_coord_t left_bg = lv_obj_get_style_pad_left(arc, LV_ARC_PART_BG);
lv_coord_t right_bg = lv_obj_get_style_pad_right(arc, LV_ARC_PART_BG);
lv_coord_t top_bg = lv_obj_get_style_pad_top(arc, LV_ARC_PART_BG);
lv_coord_t bottom_bg = lv_obj_get_style_pad_bottom(arc, LV_ARC_PART_BG);
lv_coord_t r = (LV_MATH_MIN(lv_obj_get_width(arc) - left_bg - right_bg,
lv_obj_get_height(arc) - top_bg - bottom_bg)) / 2;
lv_coord_t x = arc->coords.x1 + r + left_bg;
lv_coord_t y = arc->coords.y1 + r + top_bg;
lv_draw_line_dsc_t arc_dsc;
lv_draw_line_dsc_init(&arc_dsc);
lv_obj_init_draw_line_dsc(arc, LV_ARC_PART_BG, &arc_dsc);
lv_draw_arc(x, y, r, ext->bg_angle_start + ext->rotation_angle, ext->bg_angle_end + ext->rotation_angle, clip_area, &arc_dsc);
lv_draw_line_dsc_init(&arc_dsc);
lv_obj_init_draw_line_dsc(arc, LV_ARC_PART_INDIC, &arc_dsc);
/*make the indicator arc smaller or larger according to its greatest padding value*/
lv_coord_t left_indic = lv_obj_get_style_pad_left(arc, LV_ARC_PART_INDIC);
lv_coord_t right_indic = lv_obj_get_style_pad_right(arc, LV_ARC_PART_INDIC);
lv_coord_t top_indic = lv_obj_get_style_pad_top(arc, LV_ARC_PART_INDIC);
lv_coord_t bottom_indic = lv_obj_get_style_pad_bottom(arc, LV_ARC_PART_INDIC);
r -= LV_MATH_MAX4(left_indic, right_indic, top_indic, bottom_indic);
lv_draw_arc(x, y, r, ext->arc_angle_start + ext->rotation_angle, ext->arc_angle_end + ext->rotation_angle, clip_area, &arc_dsc);
}
/*Post draw when the children are drawn*/
else if(mode == LV_DESIGN_DRAW_POST) {
}
return LV_DESIGN_RES_OK;
}
/**
* Signal function of the arc
* @param arc pointer to a arc object
* @param sign a signal type from lv_signal_t enum
* @param param pointer to a signal specific variable
* @return LV_RES_OK: the object is not deleted in the function; LV_RES_INV: the object is deleted
*/
static lv_res_t lv_arc_signal(lv_obj_t * arc, lv_signal_t sign, void * param)
{
lv_res_t res;
if(sign == LV_SIGNAL_GET_STYLE) {
lv_get_style_info_t * info = param;
info->result = lv_arc_get_style(arc, info->part);
if(info->result != NULL) return LV_RES_OK;
else return ancestor_signal(arc, sign, param);
}
/* Include the ancient signal function */
res = ancestor_signal(arc, 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);
if(sign == LV_SIGNAL_CLEANUP) {
lv_obj_clean_style_list(arc, LV_ARC_PART_INDIC);
}
return res;
}
/**
* Get the style descriptor of a part of the object
* @param arc pointer the object
* @param part the part of the object. (LV_ARC_PART_...)
* @return pointer to the style descriptor of the specified part
*/
static lv_style_list_t * lv_arc_get_style(lv_obj_t * arc, uint8_t part)
{
LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
lv_style_list_t * style_dsc_p;
switch(part) {
case LV_ARC_PART_BG:
style_dsc_p = &arc->style_list;
break;
case LV_ARC_PART_INDIC:
style_dsc_p = &ext->style_arc;
break;
default:
style_dsc_p = NULL;
}
return style_dsc_p;
}
static void inv_arc_area(lv_obj_t * arc, uint16_t start_angle, uint16_t end_angle)
{
lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
start_angle += ext->rotation_angle;
end_angle += ext->rotation_angle;
if(start_angle >= 360) start_angle -= 360;
if(end_angle >= 360) end_angle -= 360;
uint8_t start_quarter = start_angle / 90;
uint8_t end_quarter = end_angle / 90;
lv_coord_t left = lv_obj_get_style_pad_left(arc, LV_ARC_PART_BG);
lv_coord_t right = lv_obj_get_style_pad_right(arc, LV_ARC_PART_BG);
lv_coord_t top = lv_obj_get_style_pad_top(arc, LV_ARC_PART_BG);
lv_coord_t bottom = lv_obj_get_style_pad_bottom(arc, LV_ARC_PART_BG);
lv_coord_t rout = (LV_MATH_MIN(lv_obj_get_width(arc) - left - right, lv_obj_get_height(arc) - top - bottom)) / 2;
lv_coord_t x = arc->coords.x1 + rout + left;
lv_coord_t y = arc->coords.y1 + rout + top;
lv_style_int_t w = lv_obj_get_style_line_width(arc, LV_ARC_PART_INDIC);
lv_style_int_t rounded = lv_obj_get_style_line_rounded(arc, LV_ARC_PART_INDIC);
lv_coord_t rin = rout - w;
lv_coord_t extra_area = rounded ? w / 2 + 2 : 0;
lv_area_t inv_area;
if(start_quarter == end_quarter && start_angle <= end_angle) {
if(start_quarter == 0) {
inv_area.y1 = y + ((lv_trigo_sin(start_angle) * rin) >> LV_TRIGO_SHIFT) - extra_area;
inv_area.x2 = x + ((lv_trigo_sin(start_angle + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
inv_area.y2 = y + ((lv_trigo_sin(end_angle) * rout) >> LV_TRIGO_SHIFT) + extra_area;
inv_area.x1 = x + ((lv_trigo_sin(end_angle + 90) * rin) >> LV_TRIGO_SHIFT) - extra_area;
lv_obj_invalidate_area(arc, &inv_area);
}
else if(start_quarter == 1) {
inv_area.y2 = y + ((lv_trigo_sin(start_angle) * rout) >> LV_TRIGO_SHIFT) + extra_area;
inv_area.x2 = x + ((lv_trigo_sin(start_angle + 90) * rin) >> LV_TRIGO_SHIFT) + extra_area;
inv_area.y1 = y + ((lv_trigo_sin(end_angle) * rin) >> LV_TRIGO_SHIFT) - extra_area;
inv_area.x1 = x + ((lv_trigo_sin(end_angle + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
lv_obj_invalidate_area(arc, &inv_area);
}
else if(start_quarter == 2) {
inv_area.x1 = x + ((lv_trigo_sin(start_angle + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
inv_area.y2 = y + ((lv_trigo_sin(start_angle) * rin) >> LV_TRIGO_SHIFT) + extra_area;
inv_area.y1 = y + ((lv_trigo_sin(end_angle) * rout) >> LV_TRIGO_SHIFT) - extra_area;
inv_area.x2 = x + ((lv_trigo_sin(end_angle + 90) * rin) >> LV_TRIGO_SHIFT) + extra_area;
lv_obj_invalidate_area(arc, &inv_area);
}
else if(start_quarter == 3) {
/*Small arc here*/
inv_area.x1 = x + ((lv_trigo_sin(start_angle + 90) * rin) >> LV_TRIGO_SHIFT) - extra_area;
inv_area.y1 = y + ((lv_trigo_sin(start_angle) * rout) >> LV_TRIGO_SHIFT) - extra_area;
inv_area.x2 = x + ((lv_trigo_sin(end_angle + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
inv_area.y2 = y + ((lv_trigo_sin(end_angle) * rin) >> LV_TRIGO_SHIFT) + extra_area;
lv_obj_invalidate_area(arc, &inv_area);
}
}
else if(start_quarter == 0 && end_quarter == 1) {
inv_area.x1 = x + ((lv_trigo_sin(end_angle + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
inv_area.y1 = y + ((LV_MATH_MIN(lv_trigo_sin(end_angle),
lv_trigo_sin(start_angle)) * rin) >> LV_TRIGO_SHIFT) - extra_area;
inv_area.x2 = x + ((lv_trigo_sin(start_angle + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
inv_area.y2 = y + rout + extra_area;
lv_obj_invalidate_area(arc, &inv_area);
}
else if(start_quarter == 1 && end_quarter == 2) {
inv_area.x1 = x - rout - extra_area;
inv_area.y1 = y + ((lv_trigo_sin(end_angle) * rout) >> LV_TRIGO_SHIFT) - extra_area;
inv_area.x2 = x + ((LV_MATH_MAX(lv_trigo_sin(start_angle + 90),
lv_trigo_sin(end_angle + 90)) * rin) >> LV_TRIGO_SHIFT) + extra_area;
inv_area.y2 = y + ((lv_trigo_sin(start_angle) * rout) >> LV_TRIGO_SHIFT) + extra_area;
lv_obj_invalidate_area(arc, &inv_area);
}
else if(start_quarter == 2 && end_quarter == 3) {
inv_area.x1 = x + ((lv_trigo_sin(start_angle + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
inv_area.y1 = y - rout - extra_area;
inv_area.x2 = x + ((lv_trigo_sin(end_angle + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
inv_area.y2 = y + (LV_MATH_MAX(lv_trigo_sin(end_angle) * rin,
lv_trigo_sin(start_angle) * rin) >> LV_TRIGO_SHIFT) + extra_area;
lv_obj_invalidate_area(arc, &inv_area);
}
else if(start_quarter == 3 && end_quarter == 0) {
inv_area.x1 = x + ((LV_MATH_MIN(lv_trigo_sin(end_angle + 90),
lv_trigo_sin(start_angle + 90)) * rin) >> LV_TRIGO_SHIFT) - extra_area;
inv_area.y1 = y + ((lv_trigo_sin(start_angle) * rout) >> LV_TRIGO_SHIFT) - extra_area;
inv_area.x2 = x + rout + extra_area;
inv_area.y2 = y + ((lv_trigo_sin(end_angle) * rout) >> LV_TRIGO_SHIFT) + extra_area;
lv_obj_invalidate_area(arc, &inv_area);
}
else {
lv_obj_invalidate(arc);
}
}
#endif
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