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lvgl/src/draw/lv_draw_arc.c

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/**
* @file lv_draw_arc.c
*
*/
/*********************
* INCLUDES
*********************/
#include "../core/lv_obj.h"
#include "lv_draw_arc.h"
#include "../core/lv_obj_event.h"
#include "../stdlib/lv_string.h"
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
void lv_draw_arc_dsc_init(lv_draw_arc_dsc_t * dsc)
{
lv_memzero(dsc, sizeof(lv_draw_arc_dsc_t));
dsc->width = 1;
dsc->opa = LV_OPA_COVER;
dsc->color = lv_color_black();
}
lv_draw_arc_dsc_t * lv_draw_task_get_arc_dsc(lv_draw_task_t * task)
{
return task->type == LV_DRAW_TASK_TYPE_ARC ? (lv_draw_arc_dsc_t *)task->draw_dsc : NULL;
}
void lv_draw_arc(lv_layer_t * layer, const lv_draw_arc_dsc_t * dsc)
{
if(dsc->opa <= LV_OPA_MIN) return;
if(dsc->width == 0) return;
if(dsc->start_angle == dsc->end_angle) return;
LV_PROFILER_BEGIN;
lv_area_t a;
a.x1 = dsc->center.x - dsc->radius;
a.y1 = dsc->center.y - dsc->radius;
a.x2 = dsc->center.x + dsc->radius - 1;
a.y2 = dsc->center.y + dsc->radius - 1;
lv_draw_task_t * t = lv_draw_add_task(layer, &a);
t->draw_dsc = lv_malloc(sizeof(*dsc));
lv_memcpy(t->draw_dsc, dsc, sizeof(*dsc));
t->type = LV_DRAW_TASK_TYPE_ARC;
lv_draw_finalize_task_creation(layer, t);
LV_PROFILER_END;
}
void lv_draw_arc_get_area(int32_t x, int32_t y, uint16_t radius, lv_value_precise_t start_angle,
lv_value_precise_t end_angle,
int32_t w, bool rounded, lv_area_t * area)
{
int32_t rout = radius;
int32_t start_angle_int = (int32_t) start_angle;
int32_t end_angle_int = (int32_t) end_angle;
/*Special case: full arc invalidation */
if(end_angle_int == start_angle_int + 360) {
area->x1 = x - rout;
area->y1 = y - rout;
area->x2 = x + rout;
area->y2 = y + rout;
return;
}
if(start_angle_int > 360) start_angle_int -= 360;
if(end_angle_int > 360) end_angle_int -= 360;
int32_t rin = radius - w;
int32_t extra_area = rounded ? w / 2 + 1 : 0;
uint8_t start_quarter = start_angle_int / 90;
uint8_t end_quarter = end_angle_int / 90;
/*360 deg still counts as quarter 3 (360 / 90 would be 4)*/
if(start_quarter == 4) start_quarter = 3;
if(end_quarter == 4) end_quarter = 3;
if(start_quarter == end_quarter && start_angle_int <= end_angle_int) {
if(start_quarter == 0) {
area->y1 = y + ((lv_trigo_sin(start_angle_int) * rin) >> LV_TRIGO_SHIFT) - extra_area;
area->x2 = x + ((lv_trigo_sin(start_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
area->y2 = y + ((lv_trigo_sin(end_angle_int) * rout) >> LV_TRIGO_SHIFT) + extra_area;
area->x1 = x + ((lv_trigo_sin(end_angle_int + 90) * rin) >> LV_TRIGO_SHIFT) - extra_area;
}
else if(start_quarter == 1) {
area->y2 = y + ((lv_trigo_sin(start_angle_int) * rout) >> LV_TRIGO_SHIFT) + extra_area;
area->x2 = x + ((lv_trigo_sin(start_angle_int + 90) * rin) >> LV_TRIGO_SHIFT) + extra_area;
area->y1 = y + ((lv_trigo_sin(end_angle_int) * rin) >> LV_TRIGO_SHIFT) - extra_area;
area->x1 = x + ((lv_trigo_sin(end_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
}
else if(start_quarter == 2) {
area->x1 = x + ((lv_trigo_sin(start_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
area->y2 = y + ((lv_trigo_sin(start_angle_int) * rin) >> LV_TRIGO_SHIFT) + extra_area;
area->y1 = y + ((lv_trigo_sin(end_angle_int) * rout) >> LV_TRIGO_SHIFT) - extra_area;
area->x2 = x + ((lv_trigo_sin(end_angle_int + 90) * rin) >> LV_TRIGO_SHIFT) + extra_area;
}
else if(start_quarter == 3) {
area->x1 = x + ((lv_trigo_sin(start_angle_int + 90) * rin) >> LV_TRIGO_SHIFT) - extra_area;
area->y1 = y + ((lv_trigo_sin(start_angle_int) * rout) >> LV_TRIGO_SHIFT) - extra_area;
area->x2 = x + ((lv_trigo_sin(end_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
area->y2 = y + ((lv_trigo_sin(end_angle_int) * rin) >> LV_TRIGO_SHIFT) + extra_area;
}
}
else if(start_quarter == 0 && end_quarter == 1) {
area->x1 = x + ((lv_trigo_sin(end_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
area->y1 = y + ((LV_MIN(lv_trigo_sin(end_angle_int),
lv_trigo_sin(start_angle_int)) * rin) >> LV_TRIGO_SHIFT) - extra_area;
area->x2 = x + ((lv_trigo_sin(start_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
area->y2 = y + rout + extra_area;
}
else if(start_quarter == 1 && end_quarter == 2) {
area->x1 = x - rout - extra_area;
area->y1 = y + ((lv_trigo_sin(end_angle_int) * rout) >> LV_TRIGO_SHIFT) - extra_area;
area->x2 = x + ((LV_MAX(lv_trigo_sin(start_angle_int + 90),
lv_trigo_sin(end_angle_int + 90)) * rin) >> LV_TRIGO_SHIFT) + extra_area;
area->y2 = y + ((lv_trigo_sin(start_angle_int) * rout) >> LV_TRIGO_SHIFT) + extra_area;
}
else if(start_quarter == 2 && end_quarter == 3) {
area->x1 = x + ((lv_trigo_sin(start_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
area->y1 = y - rout - extra_area;
area->x2 = x + ((lv_trigo_sin(end_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
area->y2 = y + (LV_MAX(lv_trigo_sin(end_angle_int) * rin,
lv_trigo_sin(start_angle_int) * rin) >> LV_TRIGO_SHIFT) + extra_area;
}
else if(start_quarter == 3 && end_quarter == 0) {
area->x1 = x + ((LV_MIN(lv_trigo_sin(end_angle_int + 90),
lv_trigo_sin(start_angle_int + 90)) * rin) >> LV_TRIGO_SHIFT) - extra_area;
area->y1 = y + ((lv_trigo_sin(start_angle_int) * rout) >> LV_TRIGO_SHIFT) - extra_area;
area->x2 = x + rout + extra_area;
area->y2 = y + ((lv_trigo_sin(end_angle_int) * rout) >> LV_TRIGO_SHIFT) + extra_area;
}
else {
area->x1 = x - rout;
area->y1 = y - rout;
area->x2 = x + rout;
area->y2 = y + rout;
}
}
/**********************
* STATIC FUNCTIONS
**********************/
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