python - 不同的线宽与 canvas.create_line？

Question

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!

Answer 1

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。