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annotate src/bridge_map.h @ 9038:6e86ab2cba9f draft

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(svn r12857) -Fix [FS#1948]: remove the last uses of AutoPtr in the station code.
author rubidium <rubidium@openttd.org>
date Wed, 23 Apr 2008 22:16:41 +0000
parents b3bd4f1ed981
children 8c450e1754e2
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1 /* $Id$ */
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2
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3 /** @file bridge_map.h Map accessor functions for bridges. */
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4
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5 #ifndef BRIDGE_MAP_H
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6 #define BRIDGE_MAP_H
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7
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8 #include "direction_func.h"
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9 #include "rail_type.h"
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10 #include "road_map.h"
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11 #include "bridge.h"
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12
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14 /**
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15 * Checks if this is a bridge, instead of a tunnel
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16 * @param t The tile to analyze
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17 * @pre IsTileType(t, MP_TUNNELBRIDGE)
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18 * @return true if the structure is a bridge one
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19 */
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20 static inline bool IsBridge(TileIndex t)
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21 {
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22 assert(IsTileType(t, MP_TUNNELBRIDGE));
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23 return HasBit(_m[t].m5, 7);
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24 }
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26 /**
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27 * checks if there is a bridge on this tile
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28 * @param t The tile to analyze
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29 * @return true if a bridge is present
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30 */
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31 static inline bool IsBridgeTile(TileIndex t)
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32 {
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33 return IsTileType(t, MP_TUNNELBRIDGE) && IsBridge(t);
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34 }
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35
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36 /**
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37 * checks for the possibility that a bridge may be on this tile
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38 * These are in fact all the tile types on which a bridge can be found
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39 * @param t The tile to analyze
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40 * @return true if a bridge migh be present
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41 */
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42 static inline bool MayHaveBridgeAbove(TileIndex t)
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43 {
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44 return
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45 IsTileType(t, MP_CLEAR) ||
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46 IsTileType(t, MP_RAILWAY) ||
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47 IsTileType(t, MP_ROAD) ||
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48 IsTileType(t, MP_WATER) ||
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49 IsTileType(t, MP_TUNNELBRIDGE) ||
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50 IsTileType(t, MP_UNMOVABLE);
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51 }
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52
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53 /**
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54 * checks if a bridge is set above the ground of this tile
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55 * @param t The tile to analyze
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56 * @pre MayHaveBridgeAbove(t)
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57 * @return true if a bridge is detected above
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58 */
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59 static inline bool IsBridgeAbove(TileIndex t)
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60 {
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61 assert(MayHaveBridgeAbove(t));
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62 return GB(_m[t].m6, 6, 2) != 0;
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63 }
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64
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65 /**
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66 * Determines the type of bridge on a tile
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67 * @param t The tile to analyze
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68 * @pre IsBridgeTile(t)
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69 * @return The bridge type
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70 */
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71 static inline BridgeType GetBridgeType(TileIndex t)
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72 {
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73 assert(IsBridgeTile(t));
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74 return GB(_m[t].m2, 4, 4);
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75 }
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76
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77 /**
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78 * Get the axis of the bridge that goes over the tile. Not the axis or the ramp.
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79 * @param t The tile to analyze
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80 * @pre IsBridgeAbove(t)
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81 * @return the above mentioned axis
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82 */
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83 static inline Axis GetBridgeAxis(TileIndex t)
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84 {
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85 assert(IsBridgeAbove(t));
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86 return (Axis)(GB(_m[t].m6, 6, 2) - 1);
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87 }
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88
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89 /**
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90 * Finds the end of a bridge in the specified direction starting at a middle tile
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91 * @param t the bridge tile to find the bridge ramp for
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92 * @param d the direction to search in
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93 */
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94 TileIndex GetBridgeEnd(TileIndex t, DiagDirection d);
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95
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96 /**
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97 * Finds the northern end of a bridge starting at a middle tile
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98 * @param t the bridge tile to find the bridge ramp for
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99 */
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100 TileIndex GetNorthernBridgeEnd(TileIndex t);
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101
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102 /**
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103 * Finds the southern end of a bridge starting at a middle tile
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104 * @param t the bridge tile to find the bridge ramp for
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105 */
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106 TileIndex GetSouthernBridgeEnd(TileIndex t);
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107
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108
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109 /**
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110 * Starting at one bridge end finds the other bridge end
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111 * @param t the bridge ramp tile to find the other bridge ramp for
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112 */
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113 TileIndex GetOtherBridgeEnd(TileIndex t);
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114
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115 /**
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116 * Get the height ('z') of a bridge in pixels.
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117 * @param tile the bridge ramp tile to get the bridge height from
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118 * @return the height of the bridge in pixels
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119 */
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120 uint GetBridgeHeight(TileIndex tile);
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121
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122 /**
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123 * Remove the bridge over the given axis.
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124 * @param t the tile to remove the bridge from
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125 * @param a the axis of the bridge to remove
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126 * @pre MayHaveBridgeAbove(t)
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127 */
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128 static inline void ClearSingleBridgeMiddle(TileIndex t, Axis a)
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129 {
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130 assert(MayHaveBridgeAbove(t));
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131 ClrBit(_m[t].m6, 6 + a);
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132 }
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133
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134 /**
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135 * Removes bridges from the given, that is bridges along the X and Y axis.
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136 * @param t the tile to remove the bridge from
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137 * @pre MayHaveBridgeAbove(t)
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138 */
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139 static inline void ClearBridgeMiddle(TileIndex t)
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140 {
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141 ClearSingleBridgeMiddle(t, AXIS_X);
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142 ClearSingleBridgeMiddle(t, AXIS_Y);
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143 }
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144
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145 /**
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146 * Set that there is a bridge over the given axis.
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147 * @param t the tile to add the bridge to
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148 * @param a the axis of the bridge to add
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149 * @pre MayHaveBridgeAbove(t)
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150 */
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151 static inline void SetBridgeMiddle(TileIndex t, Axis a)
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152 {
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153 assert(MayHaveBridgeAbove(t));
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154 SetBit(_m[t].m6, 6 + a);
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155 }
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156
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157 /**
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158 * Generic part to make a bridge ramp for both roads and rails.
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159 * @param t the tile to make a bridge ramp
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160 * @param o the new owner of the bridge ramp
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161 * @param bridgetype the type of bridge this bridge ramp belongs to
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162 * @param d the direction this ramp must be facing
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163 * @param tt the transport type of the bridge
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164 * @param rt the road or rail type
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165 * @note this function should not be called directly.
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166 */
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167 static inline void MakeBridgeRamp(TileIndex t, Owner o, BridgeType bridgetype, DiagDirection d, TransportType tt, uint rt)
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168 {
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169 SetTileType(t, MP_TUNNELBRIDGE);
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170 SetTileOwner(t, o);
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171 _m[t].m2 = bridgetype << 4;
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172 _m[t].m3 = rt;
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173 _m[t].m4 = 0;
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174 _m[t].m5 = 1 << 7 | tt << 2 | d;
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175 }
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176
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177 /**
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178 * Make a bridge ramp for roads.
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179 * @param t the tile to make a bridge ramp
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180 * @param o the new owner of the bridge ramp
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181 * @param bridgetype the type of bridge this bridge ramp belongs to
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182 * @param d the direction this ramp must be facing
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183 * @param r the road type of the bridge
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184 */
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185 static inline void MakeRoadBridgeRamp(TileIndex t, Owner o, BridgeType bridgetype, DiagDirection d, RoadTypes r)
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186 {
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187 MakeBridgeRamp(t, o, bridgetype, d, TRANSPORT_ROAD, r);
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188 }
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189
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190 /**
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191 * Make a bridge ramp for rails.
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192 * @param t the tile to make a bridge ramp
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193 * @param o the new owner of the bridge ramp
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194 * @param bridgetype the type of bridge this bridge ramp belongs to
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195 * @param d the direction this ramp must be facing
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196 * @param r the rail type of the bridge
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197 */
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198 static inline void MakeRailBridgeRamp(TileIndex t, Owner o, BridgeType bridgetype, DiagDirection d, RailType r)
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199 {
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200 MakeBridgeRamp(t, o, bridgetype, d, TRANSPORT_RAIL, r);
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201 }
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202
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203
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204 #endif /* BRIDGE_MAP_H */