lvgl/src/lv_draw/lv_draw_arc.c

/**
 * @file lv_draw_arc.c
 *
 */

/*********************
 *      INCLUDES
 *********************/
#include "lv_draw_arc.h"
#include "lv_mask.h"

/*********************
 *      DEFINES
 *********************/

/**********************
 *      TYPEDEFS
 **********************/

/**********************
 *  STATIC PROTOTYPES
 **********************/

/**********************
 *  STATIC VARIABLES
 **********************/

/**********************
 *      MACROS
 **********************/

/**********************
 *   GLOBAL FUNCTIONS
 **********************/

/**
 * Draw an arc. (Can draw pie too with great thickness.)
 * @param center_x the x coordinate of the center of the arc
 * @param center_y the y coordinate of the center of the arc
 * @param radius the radius of the arc
 * @param mask the arc will be drawn only in this mask
 * @param start_angle the start angle of the arc (0 deg on the bottom, 90 deg on the right)
 * @param end_angle the end angle of the arc
 * @param style style of the arc (`body.thickness`, `body.main_color`, `body.opa` is used)
 * @param opa_scale scale down all opacities by the factor
 */
void lv_draw_arc(lv_coord_t center_x, lv_coord_t center_y, uint16_t radius, const lv_area_t * clip_area,
                 uint16_t start_angle, uint16_t end_angle, const lv_style_t * style, lv_opa_t opa_scale)
{

    lv_style_t circle_style;
    lv_style_copy(&circle_style, style);
    circle_style.body.radius = LV_RADIUS_CIRCLE;
    circle_style.body.opa = LV_OPA_TRANSP;
    circle_style.body.border.width = style->line.width;
    circle_style.body.border.color = style->line.color;


    lv_mask_param_t mask_angle_param;
    lv_mask_angle_init(&mask_angle_param, center_x, center_y, start_angle, end_angle);

    int16_t mask_angle_id = lv_mask_add(lv_mask_angle, &mask_angle_param, NULL);


    printf("s:%d, e:%d\n", start_angle, end_angle);


    lv_area_t area;
    area.x1 = center_x - radius;
    area.y1 = center_y - radius;
    area.x2 = center_x + radius;
    area.y2 = center_y + radius;

    lv_draw_rect(&area, clip_area, &circle_style, LV_OPA_COVER);

    lv_mask_remove_id(mask_angle_id);

}


/**********************
 *   STATIC FUNCTIONS
 **********************/