153 lines
5.8 KiB
C
153 lines
5.8 KiB
C
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/**
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* @file lv_draw_arc.c
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*
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*/
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/*********************
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* INCLUDES
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*********************/
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#include "lv_draw.h"
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#include "lv_draw_arc.h"
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/*********************
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* DEFINES
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*********************/
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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/**********************
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* STATIC VARIABLES
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**********************/
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/**********************
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* MACROS
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**********************/
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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void lv_draw_arc_dsc_init(lv_draw_arc_dsc_t * dsc)
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{
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lv_memset_00(dsc, sizeof(lv_draw_arc_dsc_t));
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dsc->width = 1;
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dsc->opa = LV_OPA_COVER;
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dsc->color = lv_color_black();
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}
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void lv_draw_arc(lv_draw_ctx_t * draw_ctx, const lv_draw_arc_dsc_t * dsc, const lv_point_t * center, uint16_t radius,
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uint16_t start_angle, uint16_t end_angle)
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{
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if(dsc->opa <= LV_OPA_MIN) return;
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if(dsc->width == 0) return;
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if(start_angle == end_angle) return;
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draw_ctx->draw_arc(draw_ctx, dsc, center, radius, start_angle, end_angle);
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// const lv_draw_backend_t * backend = lv_draw_backend_get();
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// backend->draw_arc(center_x, center_y, radius, start_angle, end_angle, clip_area, dsc);
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}
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void lv_draw_arc_get_area(lv_coord_t x, lv_coord_t y, uint16_t radius, uint16_t start_angle, uint16_t end_angle,
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lv_coord_t w, bool rounded, lv_area_t * area)
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{
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lv_coord_t rout = radius;
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/*Special case: full arc invalidation */
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if(end_angle == start_angle + 360) {
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area->x1 = x - rout;
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area->y1 = y - rout;
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area->x2 = x + rout;
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area->y2 = y + rout;
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return;
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}
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if(start_angle > 360) start_angle -= 360;
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if(end_angle > 360) end_angle -= 360;
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lv_coord_t rin = radius - w;
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lv_coord_t extra_area = rounded ? w / 2 + 1 : 0;
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uint8_t start_quarter = start_angle / 90;
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uint8_t end_quarter = end_angle / 90;
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/*360 deg still counts as quarter 3 (360 / 90 would be 4)*/
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if(start_quarter == 4) start_quarter = 3;
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if(end_quarter == 4) end_quarter = 3;
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if(start_quarter == end_quarter && start_angle <= end_angle) {
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if(start_quarter == 0) {
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area->y1 = y + ((lv_trigo_sin(start_angle) * rin) >> LV_TRIGO_SHIFT) - extra_area;
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area->x2 = x + ((lv_trigo_sin(start_angle + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
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area->y2 = y + ((lv_trigo_sin(end_angle) * rout) >> LV_TRIGO_SHIFT) + extra_area;
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area->x1 = x + ((lv_trigo_sin(end_angle + 90) * rin) >> LV_TRIGO_SHIFT) - extra_area;
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}
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else if(start_quarter == 1) {
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area->y2 = y + ((lv_trigo_sin(start_angle) * rout) >> LV_TRIGO_SHIFT) + extra_area;
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area->x2 = x + ((lv_trigo_sin(start_angle + 90) * rin) >> LV_TRIGO_SHIFT) + extra_area;
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area->y1 = y + ((lv_trigo_sin(end_angle) * rin) >> LV_TRIGO_SHIFT) - extra_area;
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area->x1 = x + ((lv_trigo_sin(end_angle + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
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}
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else if(start_quarter == 2) {
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area->x1 = x + ((lv_trigo_sin(start_angle + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
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area->y2 = y + ((lv_trigo_sin(start_angle) * rin) >> LV_TRIGO_SHIFT) + extra_area;
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area->y1 = y + ((lv_trigo_sin(end_angle) * rout) >> LV_TRIGO_SHIFT) - extra_area;
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area->x2 = x + ((lv_trigo_sin(end_angle + 90) * rin) >> LV_TRIGO_SHIFT) + extra_area;
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}
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else if(start_quarter == 3) {
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area->x1 = x + ((lv_trigo_sin(start_angle + 90) * rin) >> LV_TRIGO_SHIFT) - extra_area;
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area->y1 = y + ((lv_trigo_sin(start_angle) * rout) >> LV_TRIGO_SHIFT) - extra_area;
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area->x2 = x + ((lv_trigo_sin(end_angle + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
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area->y2 = y + ((lv_trigo_sin(end_angle) * rin) >> LV_TRIGO_SHIFT) + extra_area;
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}
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}
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else if(start_quarter == 0 && end_quarter == 1) {
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area->x1 = x + ((lv_trigo_sin(end_angle + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
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area->y1 = y + ((LV_MIN(lv_trigo_sin(end_angle),
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lv_trigo_sin(start_angle)) * rin) >> LV_TRIGO_SHIFT) - extra_area;
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area->x2 = x + ((lv_trigo_sin(start_angle + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
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area->y2 = y + rout + extra_area;
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}
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else if(start_quarter == 1 && end_quarter == 2) {
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area->x1 = x - rout - extra_area;
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area->y1 = y + ((lv_trigo_sin(end_angle) * rout) >> LV_TRIGO_SHIFT) - extra_area;
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area->x2 = x + ((LV_MAX(lv_trigo_sin(start_angle + 90),
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lv_trigo_sin(end_angle + 90)) * rin) >> LV_TRIGO_SHIFT) + extra_area;
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area->y2 = y + ((lv_trigo_sin(start_angle) * rout) >> LV_TRIGO_SHIFT) + extra_area;
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}
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else if(start_quarter == 2 && end_quarter == 3) {
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area->x1 = x + ((lv_trigo_sin(start_angle + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
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area->y1 = y - rout - extra_area;
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area->x2 = x + ((lv_trigo_sin(end_angle + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
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area->y2 = y + (LV_MAX(lv_trigo_sin(end_angle) * rin,
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lv_trigo_sin(start_angle) * rin) >> LV_TRIGO_SHIFT) + extra_area;
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}
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else if(start_quarter == 3 && end_quarter == 0) {
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area->x1 = x + ((LV_MIN(lv_trigo_sin(end_angle + 90),
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lv_trigo_sin(start_angle + 90)) * rin) >> LV_TRIGO_SHIFT) - extra_area;
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area->y1 = y + ((lv_trigo_sin(start_angle) * rout) >> LV_TRIGO_SHIFT) - extra_area;
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area->x2 = x + rout + extra_area;
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area->y2 = y + ((lv_trigo_sin(end_angle) * rout) >> LV_TRIGO_SHIFT) + extra_area;
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}
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else {
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area->x1 = x - rout;
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area->y1 = y - rout;
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area->x2 = x + rout;
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area->y2 = y + rout;
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}
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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