折线图只在顶部出现一点点，

Question

我尝试用 python 制作折线图，该图只在 GUI 中的 canvas 的末尾出现了一点。 应该是纸质的数据是从数据库中取出来的。

在此处输入图像描述

import sqlite3 ###----------------Connecting to the database-------------##### 
DB = sqlite3.connect ("personal_project.db")

CURSOR = DB.cursor()
###----------------create the SQL command to create the table and save data-------------######
 COMMAND1 = """CREATE TABLE IF NOT EXISTS 
          balance (
          UserID INTEGER PRIMARY KEY,
          Date TEXT,
          Ammount TEXT,
          Descriotion)"""
CURSOR.execute(COMMAND1)

from tkinter import *
from tkinter import messagebox
import matplotlib.pyplot as plt
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg

###----------------Create the window-------------#####
main_WINDOW = Tk()
main_WINDOW.title("Study App")
main_WINDOW.geometry("1940x1080")#width*length
main_WINDOW.configure(bg="#ffffff")   

###------Show Information Using Graph-------###
graquery = '''SELECT Date, Ammount FROM balance'''
CURSOR.execute(graquery)
graresults = CURSOR.fetchall()
Date = [result[0] for result in graresults]
Ammount = [result[1] for result in graresults]
figure = plt.figure()
plt.plot(Date, Ammount)
plt.xlabel('Date')
plt.ylabel('Amount')
plt.title('Balance graph Graph')
gracanvas = Canvas(main_WINDOW, width=1070, height=452)
gracanvas.pack()
gracanvas.place(x=356, y=270)
figure_canvas = FigureCanvasTkAgg(figure, gracanvas)
gracanvas.create_window(0,0,window=figure_canvas.get_tk_widget()) 

Answer 1

考虑这段代码：

gracanvas.create_window(0,0,window=figure_canvas.get_tk_widget()) 

默认情况下， create_window方法将 window 置于给定坐标的中心，这就是您的图像的样子。 如果您希望 window 的左上角位于 0,0，请指定anchor="nw"以便 window 的西北角位于给定坐标处。

gracanvas.create_window(0,0,window=figure_canvas.get_tk_widget(), anchor="nw") 
#                                                                 ^^^^^^^^^^^