code: function(){
  		var pos = this.getpos(0);
  		if(this.prevPos.equals(pos)){ return;}
  
  		var cell = this.prevPos.getc();
  		if(!cell.isnull){
  			if(cell.qnum!==-1){
  				var dir = this.prevPos.getdir(pos,2);
  				if(dir!==cell.NDIR){
  					cell.setQdir(cell.qdir!==dir?dir:0);
  					cell.draw();
  				}
  			}
  		}
  		this.prevPos = pos;
  	}
docs: --------------------------------------------------------------------------- mv.inputdirec()      Cellのdirec(方向)のデータを入力する mv.inputarrow_cell() Cellの矢印を入力する ---------------------------------------------------------------------------