1 /**
2  * @file lv_draw_arc.c
3  *
4  */
5 
6 /*********************
7  *      INCLUDES
8  *********************/
9 #include "lv_draw.h"
10 #include "lv_draw_arc.h"
11 
12 /*********************
13  *      DEFINES
14  *********************/
15 
16 /**********************
17  *      TYPEDEFS
18  **********************/
19 
20 /**********************
21  *  STATIC PROTOTYPES
22  **********************/
23 
24 /**********************
25  *  STATIC VARIABLES
26  **********************/
27 
28 /**********************
29  *      MACROS
30  **********************/
31 
32 /**********************
33  *   GLOBAL FUNCTIONS
34  **********************/
35 
lv_draw_arc_dsc_init(lv_draw_arc_dsc_t * dsc)36 void lv_draw_arc_dsc_init(lv_draw_arc_dsc_t * dsc)
37 {
38     lv_memset_00(dsc, sizeof(lv_draw_arc_dsc_t));
39     dsc->width = 1;
40     dsc->opa = LV_OPA_COVER;
41     dsc->color = lv_color_black();
42 }
43 
lv_draw_arc(lv_draw_ctx_t * draw_ctx,const lv_draw_arc_dsc_t * dsc,const lv_point_t * center,uint16_t radius,uint16_t start_angle,uint16_t end_angle)44 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,
45                  uint16_t start_angle, uint16_t end_angle)
46 {
47     if(dsc->opa <= LV_OPA_MIN) return;
48     if(dsc->width == 0) return;
49     if(start_angle == end_angle) return;
50 
51     draw_ctx->draw_arc(draw_ctx, dsc, center, radius, start_angle, end_angle);
52 
53     //    const lv_draw_backend_t * backend = lv_draw_backend_get();
54     //    backend->draw_arc(center_x, center_y, radius, start_angle, end_angle, clip_area, dsc);
55 }
56 
lv_draw_arc_get_area(lv_coord_t x,lv_coord_t y,uint16_t radius,uint16_t start_angle,uint16_t end_angle,lv_coord_t w,bool rounded,lv_area_t * area)57 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,
58                           lv_coord_t w, bool rounded, lv_area_t * area)
59 {
60     lv_coord_t rout = radius;
61 
62     /*Special case: full arc invalidation */
63     if(end_angle == start_angle + 360) {
64         area->x1 = x - rout;
65         area->y1 = y - rout;
66         area->x2 = x + rout;
67         area->y2 = y + rout;
68         return;
69     }
70 
71     if(start_angle > 360) start_angle -= 360;
72     if(end_angle > 360) end_angle -= 360;
73 
74     lv_coord_t rin = radius - w;
75     lv_coord_t extra_area = rounded ? w / 2 + 1 : 0;
76     uint8_t start_quarter = start_angle / 90;
77     uint8_t end_quarter = end_angle / 90;
78 
79     /*360 deg still counts as quarter 3 (360 / 90 would be 4)*/
80     if(start_quarter == 4) start_quarter = 3;
81     if(end_quarter == 4) end_quarter = 3;
82 
83     if(start_quarter == end_quarter && start_angle <= end_angle) {
84         if(start_quarter == 0) {
85             area->y1 = y + ((lv_trigo_sin(start_angle) * rin) >> LV_TRIGO_SHIFT) - extra_area;
86             area->x2 = x + ((lv_trigo_sin(start_angle + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
87 
88             area->y2 = y + ((lv_trigo_sin(end_angle) * rout) >> LV_TRIGO_SHIFT) + extra_area;
89             area->x1 = x + ((lv_trigo_sin(end_angle + 90) * rin) >> LV_TRIGO_SHIFT) - extra_area;
90         }
91         else if(start_quarter == 1) {
92             area->y2 = y + ((lv_trigo_sin(start_angle) * rout) >> LV_TRIGO_SHIFT) + extra_area;
93             area->x2 = x + ((lv_trigo_sin(start_angle + 90) * rin) >> LV_TRIGO_SHIFT) + extra_area;
94 
95             area->y1 = y + ((lv_trigo_sin(end_angle) * rin) >> LV_TRIGO_SHIFT) - extra_area;
96             area->x1 = x + ((lv_trigo_sin(end_angle + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
97         }
98         else if(start_quarter == 2) {
99             area->x1 = x + ((lv_trigo_sin(start_angle + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
100             area->y2 = y + ((lv_trigo_sin(start_angle) * rin) >> LV_TRIGO_SHIFT) + extra_area;
101 
102             area->y1 = y + ((lv_trigo_sin(end_angle) * rout) >> LV_TRIGO_SHIFT) - extra_area;
103             area->x2 = x + ((lv_trigo_sin(end_angle + 90) * rin) >> LV_TRIGO_SHIFT) + extra_area;
104         }
105         else if(start_quarter == 3) {
106             area->x1 = x + ((lv_trigo_sin(start_angle + 90) * rin) >> LV_TRIGO_SHIFT) - extra_area;
107             area->y1 = y + ((lv_trigo_sin(start_angle) * rout) >> LV_TRIGO_SHIFT) - extra_area;
108 
109             area->x2 = x + ((lv_trigo_sin(end_angle + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
110             area->y2 = y + ((lv_trigo_sin(end_angle) * rin) >> LV_TRIGO_SHIFT) + extra_area;
111         }
112     }
113     else if(start_quarter == 0 && end_quarter == 1) {
114         area->x1 = x + ((lv_trigo_sin(end_angle + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
115         area->y1 = y + ((LV_MIN(lv_trigo_sin(end_angle),
116                                 lv_trigo_sin(start_angle))  * rin) >> LV_TRIGO_SHIFT) - extra_area;
117         area->x2 = x + ((lv_trigo_sin(start_angle + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
118         area->y2 = y + rout + extra_area;
119     }
120     else if(start_quarter == 1 && end_quarter == 2) {
121         area->x1 = x - rout - extra_area;
122         area->y1 = y + ((lv_trigo_sin(end_angle) * rout) >> LV_TRIGO_SHIFT) - extra_area;
123         area->x2 = x + ((LV_MAX(lv_trigo_sin(start_angle + 90),
124                                 lv_trigo_sin(end_angle + 90)) * rin) >> LV_TRIGO_SHIFT) + extra_area;
125         area->y2 = y + ((lv_trigo_sin(start_angle) * rout) >> LV_TRIGO_SHIFT) + extra_area;
126     }
127     else if(start_quarter == 2 && end_quarter == 3) {
128         area->x1 = x + ((lv_trigo_sin(start_angle + 90) * rout) >> LV_TRIGO_SHIFT) - extra_area;
129         area->y1 = y - rout - extra_area;
130         area->x2 = x + ((lv_trigo_sin(end_angle + 90) * rout) >> LV_TRIGO_SHIFT) + extra_area;
131         area->y2 = y + (LV_MAX(lv_trigo_sin(end_angle) * rin,
132                                lv_trigo_sin(start_angle) * rin) >> LV_TRIGO_SHIFT) + extra_area;
133     }
134     else if(start_quarter == 3 && end_quarter == 0) {
135         area->x1 = x + ((LV_MIN(lv_trigo_sin(end_angle + 90),
136                                 lv_trigo_sin(start_angle + 90)) * rin) >> LV_TRIGO_SHIFT) - extra_area;
137         area->y1 = y + ((lv_trigo_sin(start_angle) * rout) >> LV_TRIGO_SHIFT) - extra_area;
138         area->x2 = x + rout + extra_area;
139         area->y2 = y + ((lv_trigo_sin(end_angle) * rout) >> LV_TRIGO_SHIFT) + extra_area;
140 
141     }
142     else {
143         area->x1 = x - rout;
144         area->y1 = y - rout;
145         area->x2 = x + rout;
146         area->y2 = y + rout;
147     }
148 }
149 
150 /**********************
151  *   STATIC FUNCTIONS
152  **********************/
153