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<p>基本上,我尝试创建一条连续的直线(从用户单击开始,在用户右键单击时结束),我已经开始工作了,但是由于某些原因,端点(椭圆)并没有真正与线条的边完全对齐(当你尝试用多个点绘制一条直线或尝试直角时,这变得非常明显)。。。我什么都试过了,我完全失望了,所以我在这里发帖,看看你们有没有什么想法。。在</p>
<p>下面是代码,你可以试试看我的意思:</p>
<pre><code>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()
</code></pre>