python之不同的线宽与 canvas.create_line

有谁知道为什么我在下面的示例中 Canvas 上的线宽不同？

from Tkinter import * 
bigBoxSize = 150 
 
class cFrame(Frame): 
    def __init__(self, master, cwidth=450, cheight=450): 
        Frame.__init__(self, master, relief=RAISED, height=550, width=600, bg = "grey") 
        self.canvasWidth = cwidth 
        self.canvasHeight = cheight 
        self.canvas = Canvas(self, bg="white", width=cwidth, height=cheight, border =0) 
        self.drawGridLines() 
        self.canvas.pack(side=TOP, pady=20, padx=20) 
 
    def drawGridLines(self, linewidth = 10): 
        self.canvas.create_line(0, 0, self.canvasWidth, 0, width= linewidth ) 
        self.canvas.create_line(0, 0, 0, self.canvasHeight, width= linewidth ) 
 
        self.canvas.create_line(0, self.canvasHeight, self.canvasWidth + 2, self.canvasHeight, width= linewidth ) 
        self.canvas.create_line(self.canvasWidth, self.canvasHeight, self.canvasWidth, 1, width= linewidth ) 
 
        self.canvas.create_line(0, bigBoxSize, self.canvasWidth, bigBoxSize, width= linewidth ) 
        self.canvas.create_line(0, bigBoxSize * 2, self.canvasWidth, bigBoxSize * 2, width= linewidth) 
 
 
root = Tk() 
C = cFrame(root) 
C.pack() 
root.mainloop() 

真的让我很沮丧，因为我不知道发生了什么。如果有人可以帮助我，那就太好了。谢谢!

请您参考如下方法:

当你绘制一条宽度大于 1 的线时，额外的像素必须绘制在某处。正如您在自己的后续帖子中所观察到的，其中一些像素正在从屏幕上消失。您需要做的就是调整原始坐标以考虑线条的宽度。