diff options
Diffstat (limited to 'src/rail.h')
| -rw-r--r-- | src/rail.h | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/src/rail.h b/src/rail.h index 3f401cd37..f0a5ef609 100644 --- a/src/rail.h +++ b/src/rail.h @@ -270,6 +270,22 @@ static inline Money RailBuildCost(RailType railtype) } /** + * Returns the 'cost' of clearing the specified railtype. + * @param railtype The railtype being removed. + * @return The cost. + */ +static inline Money RailClearCost(RailType railtype) +{ + /* Clearing rail in fact earns money, but if the build cost is set + * very low then a loophole exists where money can be made. + * In this case we limit the removal earnings to 3/4s of the build + * cost. + */ + assert(railtype < RAILTYPE_END); + return max(_price[PR_CLEAR_RAIL], -RailBuildCost(railtype) * 3 / 4); +} + +/** * Calculates the cost of rail conversion * @param from The railtype we are converting from * @param to The railtype we are converting to @@ -296,7 +312,7 @@ static inline Money RailConvertCost(RailType from, RailType to) } /* make the price the same as remove + build new type */ - return RailBuildCost(to) + _price[PR_CLEAR_RAIL]; + return RailBuildCost(to) + RailClearCost(from); } void DrawTrainDepotSprite(int x, int y, int image, RailType railtype); |