Python Tkinter 连续线与端点不匹配

Question

基本上，我正在尝试创建一条连续的线(从用户单击时开始，在右键单击时结束)，并且我让它工作，但由于某种原因，端点(椭圆形)并没有真正对齐与线的两侧完美契合(当你尝试用多个点画一条直线或尝试直角时，这一点变得非常明显)...我已经尝试了几乎所有方法，但感到非常沮丧，所以我在这里发帖看看你们是否有什么想法..

这是代码，您可以尝试一下并了解我的意思:

from Tkinter import *

class GUI:
    def __init__(self,root):
        Window = Frame(root)
        self.DrawArea = Canvas(Window)
        self.DrawArea.pack()
        Window.pack()

        self.linewidth = 20

        self.DrawArea.config(cursor="crosshair")
        self.DrawArea.bind("<Button 1>",self.startline)


    def startline(self,event):
        self.startx, self.starty = self.DrawArea.canvasx(event.x),self.DrawArea.canvasy(event.y)

        xa,ya = self.startx-self.linewidth/2 , self.starty+self.linewidth/2
        xb,yb = self.startx+self.linewidth/2 , self.starty-self.linewidth/2

        self.StartPoint = self.DrawArea.create_oval(xa,ya,xb,yb,fill='red',outline='')
        self.Line = None
        self.EndPoint = None

        self.DrawArea.bind("<Motion>",self.updateline)
        self.DrawArea.bind("<Button 3>",self.killline)

    def updateline(self,event):
        if self.EndPoint: self.DrawArea.delete(self.EndPoint)
        if self.Line: self.DrawArea.delete(self.Line)

        x,y = self.DrawArea.canvasx(event.x),self.DrawArea.canvasy(event.y)
        xa,ya = x-self.linewidth/2 , y+self.linewidth/2
        xb,yb = x+self.linewidth/2 , y-self.linewidth/2

        self.Line = self.DrawArea.create_line(self.startx,self.starty,x,y,fill='red',width=self.linewidth)
        self.EndPoint = self.DrawArea.create_oval(xa,ya,xb,yb,fill='red',outline='')

    def killline(self,event):
        self.DrawArea.delete(self.Line)
        self.DrawArea.delete(self.StartPoint)
        self.DrawArea.delete(self.EndPoint)
        self.DrawArea.unbind("<Motion>")


if __name__ == '__main__':
    root = Tk()
    root.title("Line Draw")
    App = GUI(root)
    root.mainloop()

Answer 1

您可以使用capstyle，而不是在行尾绘制圆圈。和 joinstyle line 的选项.

例如:

self.Line = self.DrawArea.create_line(self.startx,self.starty, x, y, fill='red',
    width=self.linewidth, capstyle=ROUND, joinstyle=ROUND)