1 /***************************************************************************
2 * Copyright (c) 2024 Microsoft Corporation
3 *
4 * This program and the accompanying materials are made available under the
5 * terms of the MIT License which is available at
6 * https://opensource.org/licenses/MIT.
7 *
8 * SPDX-License-Identifier: MIT
9 **************************************************************************/
10
11
12 /**************************************************************************/
13 /**************************************************************************/
14 /** */
15 /** GUIX Component */
16 /** */
17 /** Utility (Utility) */
18 /** */
19 /**************************************************************************/
20
21 #define GX_SOURCE_CODE
22
23
24 /* Include necessary system files. */
25
26 #include "gx_api.h"
27 #include "gx_system.h"
28 #include "gx_utility.h"
29
30 /**************************************************************************/
31 /* */
32 /* FUNCTION RELEASE */
33 /* */
34 /* _gx_utility_circle_point_get PORTABLE C */
35 /* 6.1 */
36 /* AUTHOR */
37 /* */
38 /* Kenneth Maxwell, Microsoft Corporation */
39 /* */
40 /* DESCRIPTION */
41 /* */
42 /* This function gets the point on circle with specified angle */
43 /* and radius. */
44 /* */
45 /* INPUT */
46 /* */
47 /* xcenter x-coord of center of circle */
48 /* ycenter y-coord of center of circle */
49 /* r Radius of circle */
50 /* angle The angle where the point is */
51 /* point Return value of the point at */
52 /* the angle */
53 /* */
54 /* OUTPUT */
55 /* */
56 /* None */
57 /* */
58 /* CALLS */
59 /* */
60 /* _gx_utility_math_cos Compute cosine */
61 /* _gx_utility_math_sin Compute sine */
62 /* */
63 /* CALLED BY */
64 /* */
65 /* Application Code */
66 /* GUIX Internal Code */
67 /* */
68 /* RELEASE HISTORY */
69 /* */
70 /* DATE NAME DESCRIPTION */
71 /* */
72 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
73 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
74 /* resulting in version 6.1 */
75 /* */
76 /**************************************************************************/
_gx_utility_circle_point_get(INT xcenter,INT ycenter,UINT r,INT angle,GX_POINT * point)77 UINT _gx_utility_circle_point_get(INT xcenter, INT ycenter, UINT r, INT angle, GX_POINT *point)
78 {
79
80 INT x;
81 INT y;
82 INT d;
83 INT x_sign;
84 INT y_sign;
85 GX_BOOL swap = GX_FALSE;
86
87 angle %= 360;
88
89 if (angle < 0)
90 {
91 angle += 360;
92 }
93
94 if (angle == 0)
95 {
96 point -> gx_point_x = (GX_VALUE)(xcenter + (INT)r);
97 point -> gx_point_y = (GX_VALUE)ycenter;
98 }
99 else if (angle == 90)
100 {
101 point -> gx_point_x = (GX_VALUE)xcenter;
102 point -> gx_point_y = (GX_VALUE)(ycenter - (INT)r);
103 }
104 else if (angle == 180)
105 {
106 point -> gx_point_x = (GX_VALUE)(xcenter - (INT)r);
107 point -> gx_point_y = (GX_VALUE)ycenter;
108 }
109 else if (angle == 270)
110 {
111 point -> gx_point_x = (GX_VALUE)xcenter;
112 point -> gx_point_y = (GX_VALUE)(ycenter + (INT)r);
113 }
114 else
115 {
116 point -> gx_point_x = (GX_VALUE)(GX_FIXED_VAL_TO_INT(r * _gx_utility_math_cos(GX_FIXED_VAL_MAKE(angle))));
117 point -> gx_point_y = (GX_VALUE)(GX_FIXED_VAL_TO_INT(r * _gx_utility_math_sin(GX_FIXED_VAL_MAKE(angle))));
118
119 if (angle <= 90)
120 {
121 x_sign = 1;
122 y_sign = 1;
123
124 if (angle < 45)
125 {
126 swap = GX_TRUE;
127 }
128 }
129 else if (angle <= 180)
130 {
131 x_sign = -1;
132 y_sign = 1;
133
134 if (angle > 135)
135 {
136 swap = GX_TRUE;
137 }
138 }
139 else if (angle <= 270)
140 {
141 x_sign = -1;
142 y_sign = -1;
143
144 if (angle < 225)
145 {
146 swap = GX_TRUE;
147 }
148 }
149 else
150 {
151 x_sign = 1;
152 y_sign = -1;
153
154 if (angle > 315)
155 {
156 swap = GX_TRUE;
157 }
158 }
159
160 x = 0;
161 y = (INT)r;
162 d = (INT)(5 - 4 * r);
163
164 point -> gx_point_x = (GX_VALUE)(point -> gx_point_x * x_sign);
165 point -> gx_point_y = (GX_VALUE)(point -> gx_point_y * y_sign);
166
167 if (swap)
168 {
169 GX_SWAP_VALS(point -> gx_point_x, point -> gx_point_y);
170 }
171
172 while (x <= y)
173 {
174 if ((x > point -> gx_point_x) || (y < point -> gx_point_y))
175 {
176 break;
177 }
178
179 if (d < 0)
180 {
181 d += 8 * x + 12;
182 }
183 else
184 {
185 d += 8 * (x - y) + 20;
186 y--;
187 }
188 x++;
189 }
190
191 if (swap)
192 {
193 GX_SWAP_VALS(x, y);
194 }
195
196 x *= x_sign;
197 y *= y_sign;
198
199 point -> gx_point_x = (GX_VALUE)(xcenter + x);
200 point -> gx_point_y = (GX_VALUE)(ycenter - y);
201 }
202
203 return GX_SUCCESS;
204 }
205
206
