/** Returns true if the two supplied placements match up (represent a legal board position). */
protected boolean tilesMatch(Placement play1, Placement play2) {
// based on the relative positions of the two placements, determine the "natural" edges to
// be compared (east/west or north/south)
Orient orient1 = play1.loc.directionTo(play2.loc), orient2 = orient1.opposite();
// now rotate those "natural" edges based on the orientations of the placements
orient1 = orient1.rotate(-play1.orient.index);
orient2 = orient2.rotate(-play2.orient.index);
// now make suer those two edges match
return play1.tile.terrain.getEdge(orient1) == play2.tile.terrain.getEdge(orient2);
}
