Initialize with OpenTTD 1.9.3

src/bridge_map.cpp

@@ -0,0 +1,80 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file bridge_map.cpp Map accessor functions for bridges. */
+
+#include "stdafx.h"
+#include "landscape.h"
+#include "tunnelbridge_map.h"
+
+#include "safeguards.h"
+
+
+/**
+ * Finds the end of a bridge in the specified direction starting at a middle tile
+ * @param tile the bridge tile to find the bridge ramp for
+ * @param dir  the direction to search in
+ */
+static TileIndex GetBridgeEnd(TileIndex tile, DiagDirection dir)
+{
+	TileIndexDiff delta = TileOffsByDiagDir(dir);
+
+	dir = ReverseDiagDir(dir);
+	do {
+		tile += delta;
+	} while (!IsBridgeTile(tile) || GetTunnelBridgeDirection(tile) != dir);
+
+	return tile;
+}
+
+
+/**
+ * Finds the northern end of a bridge starting at a middle tile
+ * @param t the bridge tile to find the bridge ramp for
+ */
+TileIndex GetNorthernBridgeEnd(TileIndex t)
+{
+	return GetBridgeEnd(t, ReverseDiagDir(AxisToDiagDir(GetBridgeAxis(t))));
+}
+
+
+/**
+ * Finds the southern end of a bridge starting at a middle tile
+ * @param t the bridge tile to find the bridge ramp for
+ */
+TileIndex GetSouthernBridgeEnd(TileIndex t)
+{
+	return GetBridgeEnd(t, AxisToDiagDir(GetBridgeAxis(t)));
+}
+
+
+/**
+ * Starting at one bridge end finds the other bridge end
+ * @param tile the bridge ramp tile to find the other bridge ramp for
+ */
+TileIndex GetOtherBridgeEnd(TileIndex tile)
+{
+	assert(IsBridgeTile(tile));
+	return GetBridgeEnd(tile, GetTunnelBridgeDirection(tile));
+}
+
+/**
+ * Get the height ('z') of a bridge.
+ * @param t the bridge ramp tile to get the bridge height from
+ * @return the height of the bridge.
+ */
+int GetBridgeHeight(TileIndex t)
+{
+	int h;
+	Slope tileh = GetTileSlope(t, &h);
+	Foundation f = GetBridgeFoundation(tileh, DiagDirToAxis(GetTunnelBridgeDirection(t)));
+
+	/* one height level extra for the ramp */
+	return h + 1 + ApplyFoundationToSlope(f, &tileh);
+}