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annotate libs/ft2static/freetype/fttrigon.h @ 2:334d17aed7de

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author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 02 Feb 2014 18:36:38 +0200
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nuclear@0 1 /***************************************************************************/
nuclear@0 2 /* */
nuclear@0 3 /* fttrigon.h */
nuclear@0 4 /* */
nuclear@0 5 /* FreeType trigonometric functions (specification). */
nuclear@0 6 /* */
nuclear@0 7 /* Copyright 2001, 2003, 2005, 2007 by */
nuclear@0 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
nuclear@0 9 /* */
nuclear@0 10 /* This file is part of the FreeType project, and may only be used, */
nuclear@0 11 /* modified, and distributed under the terms of the FreeType project */
nuclear@0 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
nuclear@0 13 /* this file you indicate that you have read the license and */
nuclear@0 14 /* understand and accept it fully. */
nuclear@0 15 /* */
nuclear@0 16 /***************************************************************************/
nuclear@0 17
nuclear@0 18
nuclear@0 19 #ifndef __FTTRIGON_H__
nuclear@0 20 #define __FTTRIGON_H__
nuclear@0 21
nuclear@0 22 #include FT_FREETYPE_H
nuclear@0 23
nuclear@0 24 #ifdef FREETYPE_H
nuclear@0 25 #error "freetype.h of FreeType 1 has been loaded!"
nuclear@0 26 #error "Please fix the directory search order for header files"
nuclear@0 27 #error "so that freetype.h of FreeType 2 is found first."
nuclear@0 28 #endif
nuclear@0 29
nuclear@0 30
nuclear@0 31 FT_BEGIN_HEADER
nuclear@0 32
nuclear@0 33
nuclear@0 34 /*************************************************************************/
nuclear@0 35 /* */
nuclear@0 36 /* <Section> */
nuclear@0 37 /* computations */
nuclear@0 38 /* */
nuclear@0 39 /*************************************************************************/
nuclear@0 40
nuclear@0 41
nuclear@0 42 /*************************************************************************
nuclear@0 43 *
nuclear@0 44 * @type:
nuclear@0 45 * FT_Angle
nuclear@0 46 *
nuclear@0 47 * @description:
nuclear@0 48 * This type is used to model angle values in FreeType. Note that the
nuclear@0 49 * angle is a 16.16 fixed float value expressed in degrees.
nuclear@0 50 *
nuclear@0 51 */
nuclear@0 52 typedef FT_Fixed FT_Angle;
nuclear@0 53
nuclear@0 54
nuclear@0 55 /*************************************************************************
nuclear@0 56 *
nuclear@0 57 * @macro:
nuclear@0 58 * FT_ANGLE_PI
nuclear@0 59 *
nuclear@0 60 * @description:
nuclear@0 61 * The angle pi expressed in @FT_Angle units.
nuclear@0 62 *
nuclear@0 63 */
nuclear@0 64 #define FT_ANGLE_PI ( 180L << 16 )
nuclear@0 65
nuclear@0 66
nuclear@0 67 /*************************************************************************
nuclear@0 68 *
nuclear@0 69 * @macro:
nuclear@0 70 * FT_ANGLE_2PI
nuclear@0 71 *
nuclear@0 72 * @description:
nuclear@0 73 * The angle 2*pi expressed in @FT_Angle units.
nuclear@0 74 *
nuclear@0 75 */
nuclear@0 76 #define FT_ANGLE_2PI ( FT_ANGLE_PI * 2 )
nuclear@0 77
nuclear@0 78
nuclear@0 79 /*************************************************************************
nuclear@0 80 *
nuclear@0 81 * @macro:
nuclear@0 82 * FT_ANGLE_PI2
nuclear@0 83 *
nuclear@0 84 * @description:
nuclear@0 85 * The angle pi/2 expressed in @FT_Angle units.
nuclear@0 86 *
nuclear@0 87 */
nuclear@0 88 #define FT_ANGLE_PI2 ( FT_ANGLE_PI / 2 )
nuclear@0 89
nuclear@0 90
nuclear@0 91 /*************************************************************************
nuclear@0 92 *
nuclear@0 93 * @macro:
nuclear@0 94 * FT_ANGLE_PI4
nuclear@0 95 *
nuclear@0 96 * @description:
nuclear@0 97 * The angle pi/4 expressed in @FT_Angle units.
nuclear@0 98 *
nuclear@0 99 */
nuclear@0 100 #define FT_ANGLE_PI4 ( FT_ANGLE_PI / 4 )
nuclear@0 101
nuclear@0 102
nuclear@0 103 /*************************************************************************
nuclear@0 104 *
nuclear@0 105 * @function:
nuclear@0 106 * FT_Sin
nuclear@0 107 *
nuclear@0 108 * @description:
nuclear@0 109 * Return the sinus of a given angle in fixed point format.
nuclear@0 110 *
nuclear@0 111 * @input:
nuclear@0 112 * angle ::
nuclear@0 113 * The input angle.
nuclear@0 114 *
nuclear@0 115 * @return:
nuclear@0 116 * The sinus value.
nuclear@0 117 *
nuclear@0 118 * @note:
nuclear@0 119 * If you need both the sinus and cosinus for a given angle, use the
nuclear@0 120 * function @FT_Vector_Unit.
nuclear@0 121 *
nuclear@0 122 */
nuclear@0 123 FT_EXPORT( FT_Fixed )
nuclear@0 124 FT_Sin( FT_Angle angle );
nuclear@0 125
nuclear@0 126
nuclear@0 127 /*************************************************************************
nuclear@0 128 *
nuclear@0 129 * @function:
nuclear@0 130 * FT_Cos
nuclear@0 131 *
nuclear@0 132 * @description:
nuclear@0 133 * Return the cosinus of a given angle in fixed point format.
nuclear@0 134 *
nuclear@0 135 * @input:
nuclear@0 136 * angle ::
nuclear@0 137 * The input angle.
nuclear@0 138 *
nuclear@0 139 * @return:
nuclear@0 140 * The cosinus value.
nuclear@0 141 *
nuclear@0 142 * @note:
nuclear@0 143 * If you need both the sinus and cosinus for a given angle, use the
nuclear@0 144 * function @FT_Vector_Unit.
nuclear@0 145 *
nuclear@0 146 */
nuclear@0 147 FT_EXPORT( FT_Fixed )
nuclear@0 148 FT_Cos( FT_Angle angle );
nuclear@0 149
nuclear@0 150
nuclear@0 151 /*************************************************************************
nuclear@0 152 *
nuclear@0 153 * @function:
nuclear@0 154 * FT_Tan
nuclear@0 155 *
nuclear@0 156 * @description:
nuclear@0 157 * Return the tangent of a given angle in fixed point format.
nuclear@0 158 *
nuclear@0 159 * @input:
nuclear@0 160 * angle ::
nuclear@0 161 * The input angle.
nuclear@0 162 *
nuclear@0 163 * @return:
nuclear@0 164 * The tangent value.
nuclear@0 165 *
nuclear@0 166 */
nuclear@0 167 FT_EXPORT( FT_Fixed )
nuclear@0 168 FT_Tan( FT_Angle angle );
nuclear@0 169
nuclear@0 170
nuclear@0 171 /*************************************************************************
nuclear@0 172 *
nuclear@0 173 * @function:
nuclear@0 174 * FT_Atan2
nuclear@0 175 *
nuclear@0 176 * @description:
nuclear@0 177 * Return the arc-tangent corresponding to a given vector (x,y) in
nuclear@0 178 * the 2d plane.
nuclear@0 179 *
nuclear@0 180 * @input:
nuclear@0 181 * x ::
nuclear@0 182 * The horizontal vector coordinate.
nuclear@0 183 *
nuclear@0 184 * y ::
nuclear@0 185 * The vertical vector coordinate.
nuclear@0 186 *
nuclear@0 187 * @return:
nuclear@0 188 * The arc-tangent value (i.e. angle).
nuclear@0 189 *
nuclear@0 190 */
nuclear@0 191 FT_EXPORT( FT_Angle )
nuclear@0 192 FT_Atan2( FT_Fixed x,
nuclear@0 193 FT_Fixed y );
nuclear@0 194
nuclear@0 195
nuclear@0 196 /*************************************************************************
nuclear@0 197 *
nuclear@0 198 * @function:
nuclear@0 199 * FT_Angle_Diff
nuclear@0 200 *
nuclear@0 201 * @description:
nuclear@0 202 * Return the difference between two angles. The result is always
nuclear@0 203 * constrained to the ]-PI..PI] interval.
nuclear@0 204 *
nuclear@0 205 * @input:
nuclear@0 206 * angle1 ::
nuclear@0 207 * First angle.
nuclear@0 208 *
nuclear@0 209 * angle2 ::
nuclear@0 210 * Second angle.
nuclear@0 211 *
nuclear@0 212 * @return:
nuclear@0 213 * Constrained value of `value2-value1'.
nuclear@0 214 *
nuclear@0 215 */
nuclear@0 216 FT_EXPORT( FT_Angle )
nuclear@0 217 FT_Angle_Diff( FT_Angle angle1,
nuclear@0 218 FT_Angle angle2 );
nuclear@0 219
nuclear@0 220
nuclear@0 221 /*************************************************************************
nuclear@0 222 *
nuclear@0 223 * @function:
nuclear@0 224 * FT_Vector_Unit
nuclear@0 225 *
nuclear@0 226 * @description:
nuclear@0 227 * Return the unit vector corresponding to a given angle. After the
nuclear@0 228 * call, the value of `vec.x' will be `sin(angle)', and the value of
nuclear@0 229 * `vec.y' will be `cos(angle)'.
nuclear@0 230 *
nuclear@0 231 * This function is useful to retrieve both the sinus and cosinus of a
nuclear@0 232 * given angle quickly.
nuclear@0 233 *
nuclear@0 234 * @output:
nuclear@0 235 * vec ::
nuclear@0 236 * The address of target vector.
nuclear@0 237 *
nuclear@0 238 * @input:
nuclear@0 239 * angle ::
nuclear@0 240 * The address of angle.
nuclear@0 241 *
nuclear@0 242 */
nuclear@0 243 FT_EXPORT( void )
nuclear@0 244 FT_Vector_Unit( FT_Vector* vec,
nuclear@0 245 FT_Angle angle );
nuclear@0 246
nuclear@0 247
nuclear@0 248 /*************************************************************************
nuclear@0 249 *
nuclear@0 250 * @function:
nuclear@0 251 * FT_Vector_Rotate
nuclear@0 252 *
nuclear@0 253 * @description:
nuclear@0 254 * Rotate a vector by a given angle.
nuclear@0 255 *
nuclear@0 256 * @inout:
nuclear@0 257 * vec ::
nuclear@0 258 * The address of target vector.
nuclear@0 259 *
nuclear@0 260 * @input:
nuclear@0 261 * angle ::
nuclear@0 262 * The address of angle.
nuclear@0 263 *
nuclear@0 264 */
nuclear@0 265 FT_EXPORT( void )
nuclear@0 266 FT_Vector_Rotate( FT_Vector* vec,
nuclear@0 267 FT_Angle angle );
nuclear@0 268
nuclear@0 269
nuclear@0 270 /*************************************************************************
nuclear@0 271 *
nuclear@0 272 * @function:
nuclear@0 273 * FT_Vector_Length
nuclear@0 274 *
nuclear@0 275 * @description:
nuclear@0 276 * Return the length of a given vector.
nuclear@0 277 *
nuclear@0 278 * @input:
nuclear@0 279 * vec ::
nuclear@0 280 * The address of target vector.
nuclear@0 281 *
nuclear@0 282 * @return:
nuclear@0 283 * The vector length, expressed in the same units that the original
nuclear@0 284 * vector coordinates.
nuclear@0 285 *
nuclear@0 286 */
nuclear@0 287 FT_EXPORT( FT_Fixed )
nuclear@0 288 FT_Vector_Length( FT_Vector* vec );
nuclear@0 289
nuclear@0 290
nuclear@0 291 /*************************************************************************
nuclear@0 292 *
nuclear@0 293 * @function:
nuclear@0 294 * FT_Vector_Polarize
nuclear@0 295 *
nuclear@0 296 * @description:
nuclear@0 297 * Compute both the length and angle of a given vector.
nuclear@0 298 *
nuclear@0 299 * @input:
nuclear@0 300 * vec ::
nuclear@0 301 * The address of source vector.
nuclear@0 302 *
nuclear@0 303 * @output:
nuclear@0 304 * length ::
nuclear@0 305 * The vector length.
nuclear@0 306 *
nuclear@0 307 * angle ::
nuclear@0 308 * The vector angle.
nuclear@0 309 *
nuclear@0 310 */
nuclear@0 311 FT_EXPORT( void )
nuclear@0 312 FT_Vector_Polarize( FT_Vector* vec,
nuclear@0 313 FT_Fixed *length,
nuclear@0 314 FT_Angle *angle );
nuclear@0 315
nuclear@0 316
nuclear@0 317 /*************************************************************************
nuclear@0 318 *
nuclear@0 319 * @function:
nuclear@0 320 * FT_Vector_From_Polar
nuclear@0 321 *
nuclear@0 322 * @description:
nuclear@0 323 * Compute vector coordinates from a length and angle.
nuclear@0 324 *
nuclear@0 325 * @output:
nuclear@0 326 * vec ::
nuclear@0 327 * The address of source vector.
nuclear@0 328 *
nuclear@0 329 * @input:
nuclear@0 330 * length ::
nuclear@0 331 * The vector length.
nuclear@0 332 *
nuclear@0 333 * angle ::
nuclear@0 334 * The vector angle.
nuclear@0 335 *
nuclear@0 336 */
nuclear@0 337 FT_EXPORT( void )
nuclear@0 338 FT_Vector_From_Polar( FT_Vector* vec,
nuclear@0 339 FT_Fixed length,
nuclear@0 340 FT_Angle angle );
nuclear@0 341
nuclear@0 342 /* */
nuclear@0 343
nuclear@0 344
nuclear@0 345 FT_END_HEADER
nuclear@0 346
nuclear@0 347 #endif /* __FTTRIGON_H__ */
nuclear@0 348
nuclear@0 349
nuclear@0 350 /* END */