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annotate freetype2/freetype/fttrigon.h @ 1299:f0e805c09ed6 draft

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minor fix xml_walk and pickup_float, not work yet.
author Yutaka_Kinjyo <yutaka@cr.ie.u-ryukyu.ac.jp>
date Sun, 04 Dec 2011 18:50:53 +0900
parents a8ab91f49cac
children
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1 /***************************************************************************/
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2 /* */
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3 /* fttrigon.h */
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4 /* */
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5 /* FreeType trigonometric functions (specification). */
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6 /* */
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7 /* Copyright 2001, 2003, 2005, 2007 by */
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8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
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9 /* */
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10 /* This file is part of the FreeType project, and may only be used, */
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11 /* modified, and distributed under the terms of the FreeType project */
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12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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13 /* this file you indicate that you have read the license and */
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14 /* understand and accept it fully. */
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15 /* */
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16 /***************************************************************************/
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17
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18
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19 #ifndef __FTTRIGON_H__
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20 #define __FTTRIGON_H__
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21
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22 #include FT_FREETYPE_H
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23
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24 #ifdef FREETYPE_H
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25 #error "freetype.h of FreeType 1 has been loaded!"
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26 #error "Please fix the directory search order for header files"
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27 #error "so that freetype.h of FreeType 2 is found first."
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28 #endif
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29
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30
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31 FT_BEGIN_HEADER
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32
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33
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34 /*************************************************************************/
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35 /* */
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36 /* <Section> */
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37 /* computations */
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38 /* */
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39 /*************************************************************************/
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40
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41
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42 /*************************************************************************
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43 *
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44 * @type:
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45 * FT_Angle
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46 *
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47 * @description:
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48 * This type is used to model angle values in FreeType. Note that the
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49 * angle is a 16.16 fixed float value expressed in degrees.
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50 *
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51 */
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52 typedef FT_Fixed FT_Angle;
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53
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54
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55 /*************************************************************************
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56 *
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57 * @macro:
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58 * FT_ANGLE_PI
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59 *
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60 * @description:
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61 * The angle pi expressed in @FT_Angle units.
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62 *
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63 */
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64 #define FT_ANGLE_PI ( 180L << 16 )
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65
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66
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67 /*************************************************************************
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68 *
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69 * @macro:
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70 * FT_ANGLE_2PI
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71 *
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72 * @description:
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73 * The angle 2*pi expressed in @FT_Angle units.
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74 *
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75 */
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76 #define FT_ANGLE_2PI ( FT_ANGLE_PI * 2 )
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77
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78
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79 /*************************************************************************
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80 *
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81 * @macro:
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82 * FT_ANGLE_PI2
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83 *
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84 * @description:
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85 * The angle pi/2 expressed in @FT_Angle units.
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86 *
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87 */
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88 #define FT_ANGLE_PI2 ( FT_ANGLE_PI / 2 )
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89
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90
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91 /*************************************************************************
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92 *
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93 * @macro:
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94 * FT_ANGLE_PI4
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95 *
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96 * @description:
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97 * The angle pi/4 expressed in @FT_Angle units.
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98 *
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99 */
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100 #define FT_ANGLE_PI4 ( FT_ANGLE_PI / 4 )
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101
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102
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103 /*************************************************************************
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104 *
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105 * @function:
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106 * FT_Sin
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107 *
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108 * @description:
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109 * Return the sinus of a given angle in fixed point format.
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110 *
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111 * @input:
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112 * angle ::
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113 * The input angle.
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114 *
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115 * @return:
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116 * The sinus value.
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117 *
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118 * @note:
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119 * If you need both the sinus and cosinus for a given angle, use the
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120 * function @FT_Vector_Unit.
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121 *
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122 */
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123 FT_EXPORT( FT_Fixed )
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124 FT_Sin( FT_Angle angle );
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125
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126
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127 /*************************************************************************
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128 *
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129 * @function:
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130 * FT_Cos
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131 *
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132 * @description:
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133 * Return the cosinus of a given angle in fixed point format.
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134 *
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135 * @input:
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136 * angle ::
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137 * The input angle.
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138 *
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139 * @return:
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140 * The cosinus value.
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141 *
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142 * @note:
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143 * If you need both the sinus and cosinus for a given angle, use the
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144 * function @FT_Vector_Unit.
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145 *
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146 */
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147 FT_EXPORT( FT_Fixed )
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148 FT_Cos( FT_Angle angle );
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149
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150
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151 /*************************************************************************
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152 *
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153 * @function:
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154 * FT_Tan
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155 *
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156 * @description:
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157 * Return the tangent of a given angle in fixed point format.
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158 *
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159 * @input:
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160 * angle ::
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161 * The input angle.
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162 *
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163 * @return:
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164 * The tangent value.
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165 *
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166 */
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167 FT_EXPORT( FT_Fixed )
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168 FT_Tan( FT_Angle angle );
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169
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170
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171 /*************************************************************************
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172 *
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173 * @function:
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174 * FT_Atan2
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175 *
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176 * @description:
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177 * Return the arc-tangent corresponding to a given vector (x,y) in
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178 * the 2d plane.
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179 *
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180 * @input:
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181 * x ::
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182 * The horizontal vector coordinate.
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183 *
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184 * y ::
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185 * The vertical vector coordinate.
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186 *
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187 * @return:
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188 * The arc-tangent value (i.e. angle).
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189 *
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190 */
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191 FT_EXPORT( FT_Angle )
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192 FT_Atan2( FT_Fixed x,
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193 FT_Fixed y );
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194
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195
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196 /*************************************************************************
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197 *
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198 * @function:
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199 * FT_Angle_Diff
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200 *
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201 * @description:
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202 * Return the difference between two angles. The result is always
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203 * constrained to the ]-PI..PI] interval.
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204 *
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205 * @input:
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206 * angle1 ::
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207 * First angle.
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208 *
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209 * angle2 ::
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210 * Second angle.
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211 *
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212 * @return:
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213 * Constrained value of `value2-value1'.
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214 *
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215 */
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216 FT_EXPORT( FT_Angle )
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217 FT_Angle_Diff( FT_Angle angle1,
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218 FT_Angle angle2 );
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219
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220
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221 /*************************************************************************
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222 *
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223 * @function:
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224 * FT_Vector_Unit
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225 *
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226 * @description:
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227 * Return the unit vector corresponding to a given angle. After the
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228 * call, the value of `vec.x' will be `sin(angle)', and the value of
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229 * `vec.y' will be `cos(angle)'.
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230 *
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231 * This function is useful to retrieve both the sinus and cosinus of a
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232 * given angle quickly.
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233 *
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234 * @output:
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235 * vec ::
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236 * The address of target vector.
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237 *
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238 * @input:
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239 * angle ::
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240 * The address of angle.
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241 *
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242 */
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243 FT_EXPORT( void )
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244 FT_Vector_Unit( FT_Vector* vec,
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245 FT_Angle angle );
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246
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247
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248 /*************************************************************************
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249 *
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250 * @function:
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251 * FT_Vector_Rotate
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252 *
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253 * @description:
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254 * Rotate a vector by a given angle.
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255 *
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256 * @inout:
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257 * vec ::
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258 * The address of target vector.
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259 *
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260 * @input:
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261 * angle ::
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262 * The address of angle.
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263 *
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264 */
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265 FT_EXPORT( void )
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266 FT_Vector_Rotate( FT_Vector* vec,
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267 FT_Angle angle );
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268
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269
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270 /*************************************************************************
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271 *
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272 * @function:
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273 * FT_Vector_Length
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274 *
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275 * @description:
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276 * Return the length of a given vector.
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277 *
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278 * @input:
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279 * vec ::
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280 * The address of target vector.
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281 *
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282 * @return:
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283 * The vector length, expressed in the same units that the original
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284 * vector coordinates.
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285 *
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286 */
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287 FT_EXPORT( FT_Fixed )
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288 FT_Vector_Length( FT_Vector* vec );
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289
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290
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291 /*************************************************************************
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292 *
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293 * @function:
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294 * FT_Vector_Polarize
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295 *
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296 * @description:
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297 * Compute both the length and angle of a given vector.
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298 *
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299 * @input:
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300 * vec ::
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301 * The address of source vector.
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302 *
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303 * @output:
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304 * length ::
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305 * The vector length.
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306 *
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307 * angle ::
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308 * The vector angle.
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309 *
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310 */
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311 FT_EXPORT( void )
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312 FT_Vector_Polarize( FT_Vector* vec,
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313 FT_Fixed *length,
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314 FT_Angle *angle );
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315
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316
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317 /*************************************************************************
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318 *
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319 * @function:
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320 * FT_Vector_From_Polar
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321 *
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322 * @description:
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323 * Compute vector coordinates from a length and angle.
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324 *
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325 * @output:
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326 * vec ::
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327 * The address of source vector.
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328 *
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329 * @input:
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330 * length ::
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331 * The vector length.
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332 *
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333 * angle ::
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334 * The vector angle.
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335 *
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336 */
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337 FT_EXPORT( void )
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338 FT_Vector_From_Polar( FT_Vector* vec,
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339 FT_Fixed length,
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340 FT_Angle angle );
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341
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342 /* */
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343
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344
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345 FT_END_HEADER
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346
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347 #endif /* __FTTRIGON_H__ */
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348
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349
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350 /* END */