1 /**
2  * @file lv_draw_arc.c
3  *
4  */
5 
6 /*********************
7  *      INCLUDES
8  *********************/
9 #include "lv_draw_private.h"
10 #include "../core/lv_obj.h"
11 #include "lv_draw_arc.h"
12 #include "../core/lv_obj_event.h"
13 #include "../stdlib/lv_string.h"
14 
15 /*********************
16  *      DEFINES
17  *********************/
18 
19 /**********************
20  *      TYPEDEFS
21  **********************/
22 
23 /**********************
24  *  STATIC PROTOTYPES
25  **********************/
26 
27 /**********************
28  *  STATIC VARIABLES
29  **********************/
30 
31 /**********************
32  *      MACROS
33  **********************/
34 
35 /**********************
36  *   GLOBAL FUNCTIONS
37  **********************/
38 
lv_draw_arc_dsc_init(lv_draw_arc_dsc_t * dsc)39 void lv_draw_arc_dsc_init(lv_draw_arc_dsc_t * dsc)
40 {
41     lv_memzero(dsc, sizeof(lv_draw_arc_dsc_t));
42     dsc->width = 1;
43     dsc->opa = LV_OPA_COVER;
44     dsc->color = lv_color_black();
45     dsc->base.dsc_size = sizeof(lv_draw_arc_dsc_t);
46 }
47 
lv_draw_task_get_arc_dsc(lv_draw_task_t * task)48 lv_draw_arc_dsc_t * lv_draw_task_get_arc_dsc(lv_draw_task_t * task)
49 {
50     return task->type == LV_DRAW_TASK_TYPE_ARC ? (lv_draw_arc_dsc_t *)task->draw_dsc : NULL;
51 }
52 
lv_draw_arc(lv_layer_t * layer,const lv_draw_arc_dsc_t * dsc)53 void lv_draw_arc(lv_layer_t * layer, const lv_draw_arc_dsc_t * dsc)
54 {
55     if(dsc->opa <= LV_OPA_MIN) return;
56     if(dsc->width == 0) return;
57     if(dsc->start_angle == dsc->end_angle) return;
58 
59     LV_PROFILER_DRAW_BEGIN;
60     lv_area_t a;
61     a.x1 = dsc->center.x - dsc->radius;
62     a.y1 = dsc->center.y - dsc->radius;
63     a.x2 = dsc->center.x + dsc->radius - 1;
64     a.y2 = dsc->center.y + dsc->radius - 1;
65     lv_draw_task_t * t = lv_draw_add_task(layer, &a);
66 
67     t->draw_dsc = lv_malloc(sizeof(*dsc));
68     LV_ASSERT_MALLOC(t->draw_dsc);
69     lv_memcpy(t->draw_dsc, dsc, sizeof(*dsc));
70     t->type = LV_DRAW_TASK_TYPE_ARC;
71 
72     lv_draw_finalize_task_creation(layer, t);
73 
74     LV_PROFILER_DRAW_END;
75 }
76 
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)77 void lv_draw_arc_get_area(int32_t x, int32_t y, uint16_t radius,  lv_value_precise_t start_angle,
78                           lv_value_precise_t end_angle,
79                           int32_t w, bool rounded, lv_area_t * area)
80 {
81     int32_t rout = radius;
82     int32_t start_angle_int = (int32_t) start_angle;
83     int32_t end_angle_int = (int32_t) end_angle;
84 
85     /*Special case: full arc invalidation */
86     if(end_angle_int == start_angle_int + 360) {
87         area->x1 = x - rout;
88         area->y1 = y - rout;
89         area->x2 = x + rout;
90         area->y2 = y + rout;
91         return;
92     }
93 
94     if(start_angle_int > 360) start_angle_int -= 360;
95     if(end_angle_int > 360) end_angle_int -= 360;
96 
97     int32_t rin = radius - w;
98     int32_t extra_area = rounded ? w / 2 + 1 : 0;
99     uint8_t start_quarter = start_angle_int / 90;
100     uint8_t end_quarter = end_angle_int / 90;
101 
102     /*360 deg still counts as quarter 3 (360 / 90 would be 4)*/
103     if(start_quarter == 4) start_quarter = 3;
104     if(end_quarter == 4) end_quarter = 3;
105 
106     if(start_quarter == end_quarter && start_angle_int <= end_angle_int) {
107         if(start_quarter == 0) {
108             area->y1 = y + ((lv_trigo_sin(start_angle_int) * rin) >> LV_TRIGO_SHIFT) - extra_area;
109             area->x2 = x + ((lv_trigo_sin(start_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
110 
111             area->y2 = y + ((lv_trigo_sin(end_angle_int) * rout) >> LV_TRIGO_SHIFT) + extra_area;
112             area->x1 = x + ((lv_trigo_sin(end_angle_int + 90) * rin) >> LV_TRIGO_SHIFT) - extra_area;
113         }
114         else if(start_quarter == 1) {
115             area->y2 = y + ((lv_trigo_sin(start_angle_int) * rout) >> LV_TRIGO_SHIFT) + extra_area;
116             area->x2 = x + ((lv_trigo_sin(start_angle_int + 90) * rin) >> LV_TRIGO_SHIFT) + extra_area;
117 
118             area->y1 = y + ((lv_trigo_sin(end_angle_int) * rin) >> LV_TRIGO_SHIFT) - extra_area;
119             area->x1 = x + ((lv_trigo_sin(end_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
120         }
121         else if(start_quarter == 2) {
122             area->x1 = x + ((lv_trigo_sin(start_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
123             area->y2 = y + ((lv_trigo_sin(start_angle_int) * rin) >> LV_TRIGO_SHIFT) + extra_area;
124 
125             area->y1 = y + ((lv_trigo_sin(end_angle_int) * rout) >> LV_TRIGO_SHIFT) - extra_area;
126             area->x2 = x + ((lv_trigo_sin(end_angle_int + 90) * rin) >> LV_TRIGO_SHIFT) + extra_area;
127         }
128         else if(start_quarter == 3) {
129             area->x1 = x + ((lv_trigo_sin(start_angle_int + 90) * rin) >> LV_TRIGO_SHIFT) - extra_area;
130             area->y1 = y + ((lv_trigo_sin(start_angle_int) * rout) >> LV_TRIGO_SHIFT) - extra_area;
131 
132             area->x2 = x + ((lv_trigo_sin(end_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
133             area->y2 = y + ((lv_trigo_sin(end_angle_int) * rin) >> LV_TRIGO_SHIFT) + extra_area;
134         }
135     }
136     else if(start_quarter == 0 && end_quarter == 1) {
137         area->x1 = x + ((lv_trigo_sin(end_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
138         area->y1 = y + ((LV_MIN(lv_trigo_sin(end_angle_int),
139                                 lv_trigo_sin(start_angle_int))  * rin) >> LV_TRIGO_SHIFT) - extra_area;
140         area->x2 = x + ((lv_trigo_sin(start_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
141         area->y2 = y + rout + extra_area;
142     }
143     else if(start_quarter == 1 && end_quarter == 2) {
144         area->x1 = x - rout - extra_area;
145         area->y1 = y + ((lv_trigo_sin(end_angle_int) * rout) >> LV_TRIGO_SHIFT) - extra_area;
146         area->x2 = x + ((LV_MAX(lv_trigo_sin(start_angle_int + 90),
147                                 lv_trigo_sin(end_angle_int + 90)) * rin) >> LV_TRIGO_SHIFT) + extra_area;
148         area->y2 = y + ((lv_trigo_sin(start_angle_int) * rout) >> LV_TRIGO_SHIFT) + extra_area;
149     }
150     else if(start_quarter == 2 && end_quarter == 3) {
151         area->x1 = x + ((lv_trigo_sin(start_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
152         area->y1 = y - rout - extra_area;
153         area->x2 = x + ((lv_trigo_sin(end_angle_int + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
154         area->y2 = y + (LV_MAX(lv_trigo_sin(end_angle_int) * rin,
155                                lv_trigo_sin(start_angle_int) * rin) >> LV_TRIGO_SHIFT) + extra_area;
156     }
157     else if(start_quarter == 3 && end_quarter == 0) {
158         area->x1 = x + ((LV_MIN(lv_trigo_sin(end_angle_int + 90),
159                                 lv_trigo_sin(start_angle_int + 90)) * rin) >> LV_TRIGO_SHIFT) - extra_area;
160         area->y1 = y + ((lv_trigo_sin(start_angle_int) * rout) >> LV_TRIGO_SHIFT) - extra_area;
161         area->x2 = x + rout + extra_area;
162         area->y2 = y + ((lv_trigo_sin(end_angle_int) * rout) >> LV_TRIGO_SHIFT) + extra_area;
163 
164     }
165     else {
166         area->x1 = x - rout;
167         area->y1 = y - rout;
168         area->x2 = x + rout;
169         area->y2 = y + rout;
170     }
171 }
172 
173 /**********************
174  *   STATIC FUNCTIONS
175  **********************/
176