| … | |
… | |
| 1023 | * postive values make it darker, negative make it brighter |
1023 | * postive values make it darker, negative make it brighter |
| 1024 | */ |
1024 | */ |
| 1025 | int |
1025 | int |
| 1026 | maptile::change_map_light (int change) |
1026 | maptile::change_map_light (int change) |
| 1027 | { |
1027 | { |
| 1028 | int new_level = darkness + change; |
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| 1029 | |
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|
| 1030 | /* Nothing to do */ |
1028 | /* Nothing to do */ |
| 1031 | if (!change || (new_level <= 0 && darkness == 0) || (new_level >= MAX_DARKNESS && darkness >= MAX_DARKNESS)) |
1029 | if (!change) |
| 1032 | return 0; |
1030 | return 0; |
| 1033 | |
1031 | |
| 1034 | /* inform all players on the map */ |
1032 | /* inform all players on the map */ |
| 1035 | if (change > 0) |
1033 | if (change > 0) |
| 1036 | new_info_map (NDI_BLACK | NDI_UNIQUE, this, "It becomes darker."); |
1034 | new_info_map (NDI_BLACK | NDI_UNIQUE, this, "It becomes darker."); |
| 1037 | else |
1035 | else |
| 1038 | new_info_map (NDI_BLACK | NDI_UNIQUE, this, "It becomes brighter."); |
1036 | new_info_map (NDI_BLACK | NDI_UNIQUE, this, "It becomes brighter."); |
| 1039 | |
1037 | |
| 1040 | /* Do extra checking. since darkness is a unsigned value, |
1038 | darkness = clamp (darkness + change, -MAX_DARKNESS, MAX_DARKNESS); |
| 1041 | * we need to be extra careful about negative values. |
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|
| 1042 | * In general, the checks below are only needed if change |
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|
| 1043 | * is not +/-1 |
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|
| 1044 | */ |
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|
| 1045 | if (new_level < 0) |
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| 1046 | darkness = 0; |
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|
| 1047 | else if (new_level >= MAX_DARKNESS) |
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| 1048 | darkness = MAX_DARKNESS; |
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| 1049 | else |
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|
| 1050 | darkness = new_level; |
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| 1051 | |
1039 | |
| 1052 | /* All clients need to get re-updated for the change */ |
1040 | /* All clients need to get re-updated for the change */ |
| 1053 | update_all_map_los (this); |
1041 | update_all_map_los (this); |
| 1054 | |
1042 | |
| 1055 | return 1; |
1043 | return 1; |
