ml
63 lines
1.7 KiB
Go
63 lines
1.7 KiB
Go
package level
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// TilePosition contains the coordinates of a tile in a level.
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type TilePosition struct {
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X byte
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Y byte
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}
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// FinePosition contains the coordinates of an object within a tile.
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type FinePosition struct {
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X byte
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Y byte
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}
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// SlopeFactorFor returns the factor of how much the slope of given tile type would apply at the fine position.
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func (pos FinePosition) SlopeFactorFor(tileType TileType) float32 {
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southToNorth := float32(pos.Y) / 255
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westToEast := float32(pos.X) / 255
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swneDiag := func(northWest, southEast float32) float32 {
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if pos.X < pos.Y {
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return northWest
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}
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return southEast
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}
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nwseDiag := func(southWest, northEast float32) float32 {
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if (255 - pos.X) < pos.Y {
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return northEast
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}
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return southWest
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}
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switch tileType {
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case TileTypeSlopeSouthToNorth:
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return southToNorth
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case TileTypeSlopeWestToEast:
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return westToEast
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case TileTypeSlopeNorthToSouth:
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return 1 - southToNorth
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case TileTypeSlopeEastToWest:
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return 1 - westToEast
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case TileTypeValleySouthEastToNorthWest:
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return nwseDiag(1-westToEast, southToNorth)
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case TileTypeValleySouthWestToNorthEast:
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return swneDiag(southToNorth, westToEast)
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case TileTypeValleyNorthWestToSouthEast:
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return nwseDiag(1-southToNorth, westToEast)
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case TileTypeValleyNorthEastToSouthWest:
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return swneDiag(1-westToEast, 1-southToNorth)
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case TileTypeRidgeNorthWestToSouthEast:
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return nwseDiag(westToEast, 1-southToNorth)
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case TileTypeRidgeNorthEastToSouthWest:
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return swneDiag(1-southToNorth, 1-westToEast)
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case TileTypeRidgeSouthEastToNorthWest:
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return nwseDiag(southToNorth, 1-westToEast)
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case TileTypeRidgeSouthWestToNorthEast:
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return swneDiag(westToEast, southToNorth)
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}
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return 0.0
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}
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