The rules in Takenoko state that the Panda/Gardener can move in a straight line as far as they like, but not over gaps between tiles.
In practice this means that the movement of the Panda/Gardener is hardly restricted. Would it be possible to restrict the movements of other players by placing the Gardener/Panda right on the edge of a tile on the edge of the map, thus reducing the available angles of movement for the next person to move the Panda/Gardener?
I have assumed that movements are taken from the position of the Panda/Gardener piece, not the centre of the tile he is in. I have also assumed that the angle that the Panda/Gardener moves does not have to be congruent with any of the edges of the segment.