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@@ -41,6 +41,16 @@ enum Slope {
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};
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/**
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* Enumeration of tile corners
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*/
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enum Corner {
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CORNER_W = 0,
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CORNER_S = 1,
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CORNER_E = 2,
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CORNER_N = 3,
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};
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/**
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* Checks if a slope is steep.
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*
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* @param s The given #Slope.
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@@ -73,19 +83,19 @@ static inline Slope ComplementSlope(Slop
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*
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* @pre The slope must be a slope with one corner raised or a steep slope.
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* @param s The #Slope.
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* @return Number of the highest corner. (0 west, 1 south, 2 east, 3 north)
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* @return Highest corner.
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*/
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static inline byte GetHighestSlopeCorner(Slope s)
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static inline Corner GetHighestSlopeCorner(Slope s)
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{
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switch (s) {
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case SLOPE_W:
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case SLOPE_STEEP_W: return 0;
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case SLOPE_STEEP_W: return CORNER_W;
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case SLOPE_S:
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case SLOPE_STEEP_S: return 1;
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case SLOPE_STEEP_S: return CORNER_S;
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case SLOPE_E:
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case SLOPE_STEEP_E: return 2;
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case SLOPE_STEEP_E: return CORNER_E;
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case SLOPE_N:
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case SLOPE_STEEP_N: return 3;
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case SLOPE_STEEP_N: return CORNER_N;
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default: NOT_REACHED();
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}
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}
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@@ -103,6 +113,40 @@ static inline uint GetSlopeMaxZ(Slope s)
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return TILE_HEIGHT;
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}
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/**
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* Returns the opposite corner.
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*
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* @param corner A #Corner.
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* @return The opposite corner to "corner".
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*/
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static inline Corner OppositeCorner(Corner corner)
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{
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return (Corner)(corner ^ 2);
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}
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/**
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* Returns the slope with a specific corner raised.
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*
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* @param corner The #Corner.
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* @return The #Slope with corner "corner" raised.
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*/
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static inline Slope SlopeWithOneCornerRaised(Corner corner)
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{
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assert(IS_INT_INSIDE(corner, 0, 4));
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return (Slope)(1 << corner);
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}
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/**
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* Returns the slope with all except one corner raised.
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*
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* @param corner The #Corner.
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* @return The #Slope with all corners but "corner" raised.
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*/
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static inline Slope SlopeWithThreeCornersRaised(Corner corner)
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{
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return ComplementSlope(SlopeWithOneCornerRaised(corner));
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}
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/**
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* Enumeration for Foundations.
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