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annotate src/direction_func.h @ 9281:084086b60da8 draft

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(svn r13147) -Codechange: move the code to draw bankruptcy news to news_gui.cpp.
author rubidium <rubidium@openttd.org>
date Sat, 17 May 2008 21:13:05 +0000
parents bd6941096b6a
children bc7926153e19
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8100
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1 /* $Id$ */
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3 /** @file direction_func.h Different functions related to conversions between directions. */
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5 #ifndef DIRECTION_FUNC_H
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6 #define DIRECTION_FUNC_H
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8 #include "direction_type.h"
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10 /**
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11 * Return the reverse of a direction
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12 *
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13 * @param d The direction to get the reverse from
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14 * @return The reverse Direction
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15 */
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16 static inline Direction ReverseDir(Direction d)
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17 {
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18 return (Direction)(4 ^ d);
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19 }
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22 /**
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23 * Calculate the difference between to directions
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24 *
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25 * @param d0 The first direction as the base
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26 * @param d1 The second direction as the offset from the base
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27 * @return The difference how the second directions drifts of the first one.
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28 */
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29 static inline DirDiff DirDifference(Direction d0, Direction d1)
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30 {
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31 return (DirDiff)((d0 + 8 - d1) % 8);
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32 }
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33
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34 /**
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35 * Applies two differences together
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36 *
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37 * This function adds two differences together and return the resulting
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38 * difference. So adding two DIRDIFF_REVERSE together results in the
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39 * DIRDIFF_SAME difference.
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40 *
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41 * @param d The first difference
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42 * @param delta The second difference to add on
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43 * @return The resulting difference
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44 */
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45 static inline DirDiff ChangeDirDiff(DirDiff d, DirDiff delta)
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46 {
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47 return (DirDiff)((d + delta) % 8);
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48 }
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49
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50 /**
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51 * Change a direction by a given difference
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52 *
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53 * This functions returns a new direction of the given direction
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54 * which is rotated by the given difference.
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55 *
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56 * @param d The direction to get a new direction from
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57 * @param delta The offset/drift applied to the direction
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58 * @return The new direction
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59 */
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60 static inline Direction ChangeDir(Direction d, DirDiff delta)
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61 {
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62 return (Direction)((d + delta) % 8);
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63 }
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64
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65
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66 /**
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67 * Returns the reverse direction of the given DiagDirection
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68 *
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69 * @param d The DiagDirection to get the reverse from
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70 * @return The reverse direction
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71 */
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72 static inline DiagDirection ReverseDiagDir(DiagDirection d)
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73 {
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74 return (DiagDirection)(2 ^ d);
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75 }
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76
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77
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78 /**
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79 * Applies a difference on a DiagDirection
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80 *
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81 * This function applies a difference on a DiagDirection and returns
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82 * the new DiagDirection.
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83 *
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84 * @param d The DiagDirection
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85 * @param delta The difference to applie on
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86 * @return The new direction which was calculated
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87 */
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88 static inline DiagDirection ChangeDiagDir(DiagDirection d, DiagDirDiff delta)
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89 {
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90 return (DiagDirection)((d + delta) % 4);
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91 }
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92
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93 /**
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94 * Convert a Direction to a DiagDirection.
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95 *
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96 * This function can be used to convert the 8-way Direction to
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97 * the 4-way DiagDirection. If the direction cannot be mapped its
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98 * "rounded clockwise". So DIR_N becomes DIAGDIR_NE.
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99 *
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100 * @param dir The direction to convert
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101 * @return The resulting DiagDirection, maybe "rounded clockwise".
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102 */
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103 static inline DiagDirection DirToDiagDir(Direction dir)
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104 {
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105 return (DiagDirection)(dir >> 1);
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106 }
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107
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108 /**
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109 * Convert a DiagDirection to a Direction.
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110 *
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111 * This function can be used to convert the 4-way DiagDirection
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112 * to the 8-way Direction. As 4-way are less than 8-way not all
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113 * possible directions can be calculated.
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114 *
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115 * @param dir The direction to convert
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116 * @return The resulting Direction
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117 */
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118 static inline Direction DiagDirToDir(DiagDirection dir)
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119 {
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120 return (Direction)(dir * 2 + 1);
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121 }
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122
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123
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124 /**
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125 * Select the other axis as provided.
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126 *
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127 * This is basically the not-operator for the axis.
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128 *
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129 * @param a The given axis
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130 * @return The other axis
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131 */
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132 static inline Axis OtherAxis(Axis a)
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133 {
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134 return (Axis)(a ^ 1);
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135 }
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136
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137
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138 /**
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139 * Convert a DiagDirection to the axis.
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140 *
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141 * This function returns the axis which belongs to the given
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142 * DiagDirection. The axis X belongs to the DiagDirection
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143 * north-east and south-west.
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144 *
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145 * @param d The DiagDirection
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146 * @return The axis which belongs to the direction
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147 */
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148 static inline Axis DiagDirToAxis(DiagDirection d)
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149 {
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150 return (Axis)(d & 1);
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151 }
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152
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153
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154 /**
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155 * Converts an Axis to a DiagDirection
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156 *
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157 * This function returns the DiagDirection which
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158 * belongs to the axis. As 2 directions are mapped to an axis
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159 * this function returns the one which points to south,
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160 * either south-west (on X axis) or south-east (on Y axis)
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161 *
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162 * @param a The axis
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163 * @return The direction pointed to south
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164 */
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165 static inline DiagDirection AxisToDiagDir(Axis a)
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166 {
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167 return (DiagDirection)(2 - a);
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168 }
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169
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170 /**
9045
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171 * Converts an Axis to a Direction
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172 *
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173 * This function returns the Direction which
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174 * belongs to the axis. As 2 directions are mapped to an axis
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175 * this function returns the one which points to south,
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176 * either south-west (on X axis) or south-east (on Y axis)
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177 *
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178 * @param a The axis
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179 * @return The direction pointed to south
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180 */
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181 static inline Direction AxisToDirection(Axis a)
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182 {
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183 return (Direction)(5 - 2 * a);
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184 }
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185
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186 /**
8100
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187 * Convert an axis and a flag for north/south into a DiagDirection
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188 * @param xy axis to convert
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189 * @param ns north -> 0, south -> 1
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190 * @return the desired DiagDirection
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191 */
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192 static inline DiagDirection XYNSToDiagDir(Axis xy, uint ns)
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193 {
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194 return (DiagDirection)(xy * 3 ^ ns * 2);
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195 }
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196
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197 /**
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198 * Checks if an interger value is a valid DiagDirection
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199 *
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200 * @param d The value to check
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201 * @return True if the value belongs to a DiagDirection, else false
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202 */
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203 static inline bool IsValidDiagDirection(DiagDirection d)
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204 {
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205 return d < DIAGDIR_END;
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206 }
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207
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208 /**
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209 * Checks if an integer value is a valid Direction
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210 *
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211 * @param d The value to check
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212 * @return True if the value belongs to a Direction, else false
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213 */
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214 static inline bool IsValidDirection(Direction d)
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215 {
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216 return d < DIR_END;
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217 }
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218
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219 /**
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220 * Checks if an integer value is a valid Axis
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221 *
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222 * @param d The value to check
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223 * @return True if the value belongs to an Axis, else false
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224 */
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225 static inline bool IsValidAxis(Axis d)
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226 {
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227 return d < AXIS_END;
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228 }
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229
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230 #endif /* DIRECTION_H */