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40 lines
1.4 KiB
40 lines
1.4 KiB
#pragma once |
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#include <cstdint> |
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#include <type_traits> |
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namespace devilution { |
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enum class Direction : std::uint8_t { |
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South, |
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SouthWest, |
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West, |
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NorthWest, |
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North, |
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NorthEast, |
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East, |
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SouthEast, |
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}; |
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/** Maps from direction to a left turn from the direction. */ |
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constexpr Direction Left(Direction facing) |
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{ |
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// Direction left[8] = { Direction::SouthEast, Direction::South, Direction::SouthWest, Direction::West, Direction::NorthWest, Direction::North, Direction::NorthEast, Direction::East }; |
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return static_cast<Direction>((static_cast<std::underlying_type_t<Direction>>(facing) + 7) % 8); |
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} |
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/** Maps from direction to a right turn from the direction. */ |
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constexpr Direction Right(Direction facing) |
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{ |
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// Direction right[8] = { Direction::SouthWest, Direction::West, Direction::NorthWest, Direction::North, Direction::NorthEast, Direction::East, Direction::SouthEast, Direction::South }; |
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return static_cast<Direction>((static_cast<std::underlying_type_t<Direction>>(facing) + 1) % 8); |
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} |
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/** Maps from direction to the opposite direction. */ |
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constexpr Direction Opposite(Direction facing) |
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{ |
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// Direction opposite[8] = { Direction::North, Direction::NorthEast, Direction::East, Direction::SouthEast, Direction::South, Direction::SouthWest, Direction::West, Direction::NorthWest }; |
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return static_cast<Direction>((static_cast<std::underlying_type_t<Direction>>(facing) + 4) % 8); |
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} |
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} // namespace devilution
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