爱心代码出错，请问大家问题错在哪呢

import random
from math import sin, cos, pi, log
from tkinter import *
CANVAS_WIDTH = 648
CANVAS_HEIGHT = 648
CANVAS_CENTER_X = CANVAS_WIDTH / 2
CANVAS_CENTER_Y = CANVAS_HEIGHT / 2
IMAGE_ENLARGE = 11
HEART_COLOR = "#Fd798f"   #粉：Fd798f


def heart_functions(t, shrink_ratio: float = IMAGE_ENLARGE):
    # 爱心的宽度
    x = 16 * (sin(t) **3)
    # 爱心的长度（高宽，心头）
    y = -(15 * cos(t) - 5 * cos(2 * t) - 2 * cos(3 * t) - cos(3 * t))
    #y = -(13*cos(t) - 5 * cos(2*t) - 3 * cos(3*t) - cos(4*t))
    #放大
    x *=shrink_ratio #收缩率
    y *=shrink_ratio
    # 移到画布中间
    x += CANVAS_CENTER_X
    y += CANVAS_CENTER_Y
    return int(x), int(y)
# 散射_侧面
def scatter_inside(x, y, beta=0.15):
    ratio_x = - beta * log(random.random())
    ratio_y = - beta * log(random.random())
    dx = ratio_x * (x - CANVAS_CENTER_X)
    dy = ratio_y * (y - CANVAS_CENTER_Y)
    return x - dx, y - dy




# 收缩
def shrink(x, y, ratio):
    force = -1 / (((x - CANVAS_CENTER_X) ** 2+
                   (y - CANVAS_CENTER_Y) ** 2) ** 0.6)
    dx = ratio * force * (x - CANVAS_CENTER_X)
    dy = ratio * force * (y - CANVAS_CENTER_Y)
    return x - dx, y - dy


# 曲线
def curve(p):
    return 2 * (2 * sin(4 * p)) / (2 * pi)


class Heart:
    def __init__(self, generate_frame=20):
        self._points = set()
        self._edge_diffusion_points = set()
        self._center_diffusion_points = set()
        self.all_points = {}
        self.build(2000)
        self.random_halo = 1000
        self.generate_frame = generate_frame
        for frame in range(generate_frame):
            self.calc(frame)


    def build(self,number):
        for _ in range(number):
            t= random.uniform(0,2*pi)
            x, y = heart_functions(t)
            self._points.add((x,y))
        for _x, _y in list(self._points):
            for _ in range(3):
                x, y = scatter_inside(_x, _y, 0.3)
                self._edge_diffusion_points.add((x,y))
        point_list = list(self._points)
        for _ in range(4000):
            x, y = random.choice(point_list)
     

爱心代码出错，无法运行，请教一下大家，问题出在哪呢，谢谢

1.你光定义了类，没有调用啊：
herart = Heart()
herart.build(1)
2. 类里面少了 calc()方法