code: function(group,x1,y1,x2,y2){
  		if     (group==='cell')  { return this.cellinside  (x1,y1,x2,y2);}
  		else if(group==='cross') { return this.crossinside (x1,y1,x2,y2);}
  		else if(group==='border'){ return this.borderinside(x1,y1,x2,y2);}
  		else if(group==='excell'){ return this.excellinside(x1,y1,x2,y2);}
  		return new this.klass.PieceList();
  	}
docs: --------------------------------------------------------------------------- bd.objectinside() 座標(x1,y1)-(x2,y2)に含まれるオブジェクトのリストを取得する ---------------------------------------------------------------------------