Function ApplyFoundationToSlope

src/landscape.cpp:174–217

* Applies a foundation to a slope. * * @pre Foundation and slope must be valid combined. * @param f The #Foundation. * @param s The #Slope to modify. * @return Increment to the tile Z coordinate. */

 * @return   Increment to the tile Z coordinate.
 */
uint ApplyFoundationToSlope(Foundation f, Slope &s)
{
	if (!IsFoundation(f)) return 0;

	if (IsLeveledFoundation(f)) {
		uint dz = 1 + (IsSteepSlope(s) ? 1 : 0);
		s = SLOPE_FLAT;
		return dz;
	}

	if (f != FOUNDATION_STEEP_BOTH && IsNonContinuousFoundation(f)) {
		s = HalftileSlope(s, GetHalftileFoundationCorner(f));
		return 0;
	}

	if (IsSpecialRailFoundation(f)) {
		s = SlopeWithThreeCornersRaised(OppositeCorner(GetRailFoundationCorner(f)));
		return 0;
	}

	uint dz = IsSteepSlope(s) ? 1 : 0;
	Corner highest_corner = GetHighestSlopeCorner(s);

	switch (f) {
		case FOUNDATION_INCLINED_X:
			s = (((highest_corner == CORNER_W) || (highest_corner == CORNER_S)) ? SLOPE_SW : SLOPE_NE);
			break;

		case FOUNDATION_INCLINED_Y:
			s = (((highest_corner == CORNER_S) || (highest_corner == CORNER_E)) ? SLOPE_SE : SLOPE_NW);
			break;

		case FOUNDATION_STEEP_LOWER:
			s = SlopeWithOneCornerRaised(highest_corner);
			break;

		case FOUNDATION_STEEP_BOTH:
			s = HalftileSlope(SlopeWithOneCornerRaised(highest_corner), highest_corner);
			break;

		default: NOT_REACHED();
	}
	return dz;
}


/**