distance_x = 0
distance_y = 0
old_list = []
add_points = []
old_,new_ = [],[]
class PointList:
    def __init__(self):
        self.baseline = []

    def get_baseline(self):
        return self.baseline
    
    def old2new_list(self,new_list):
        global old_list
        tmp = []
        if not old_list:
            old_list = self.baseline
            print("not old_list")
        else:
            tmp = old_list
            old_list = new_list
        return tmp

    def get_xy_change(self,old_list,new_list):
        global distance_x,distance_y
        x,y=0,0
        # old2new_lists = self.old2new_list(new_list)
        print("len",len(old_list))
        for i in range(len(old_list)):
            x += abs(old_list[i][0] - new_list[i][0] )
            y += abs(old_list[i][1] - new_list[i][1] )
        xx = round(x/len(old_list),1)
        yy = round(y/len(old_list),1)
        distance_x += xx
        distance_y += yy
        # self.old2new_list(new_list)
        return xx,yy#保留两位小数
 
#新旧点比较,目前实现添加新点，但是没有删除旧点和更新x，y值
    def old2new_points(self,old_list,new_list):
        # i = []
        # j=0
        old_lists = self.old2new_list(old_list)
        # x,y = self.get_xy_change(old_list,new_list)
        # print("old_lists\n",old_lists)
        # print("new_list",new_list)
        global add_points,old_,new_
        for points in new_list:
            # j += 1
            key = list(tuple(points))
            is_old_point = False
            for existing_key in old_lists:
                if abs(existing_key[0] - key[0]) < 100 and abs(existing_key[1] - key[1]) < 100:
                    old_.append([existing_key[0],existing_key[1]])
                    new_.append([key[0],key[1]])
                    is_old_point = True
                    break
            if (not is_old_point) :#如果有新点出现，则将新点加上偏差值，其余保持不变
                # x,y = self.get_xy_change(old_,new_)
                # key[0] += distance_x
                # key[1] += distance_y
                # self.baseline.append(key)
                add_points.append(key)
        x,y = self.get_xy_change(old_,new_)  
        if len(add_points):              
            for i in range(len(add_points)):
                add_points[i][0] += distance_x
                add_points[i][1] += distance_y
            self.baseline.extend(add_points)
        add_points ,old_,new_ = [], [], []
        return x,y
        # self.baseline = self.baseline