我希望能够将最后一次鼠标左键单击的光标位置定义为一个点,将当前光标位置定义为真实世界坐标中的一个点。到目前为止我的代码有Tkinter导入和Math导入。我已经为这部分整理了GUI,但我不知道如何定义函数以便能够将其显示为GUI的标签。
class PointFrame(Frame):
def __init__(self, master):
Frame.__init__(self, master)
self.LastClick= Label(self, text= "Last Point Clicked:")
self.LastClick.pack(side= LEFT)
self.CurrentPosition= Label(self, text="Cursor Point:")
self.CurrentPosition.pack(side= LEFT)
需要创建以下功能。
答案 0 :(得分:4)
这样的事情:
from tkinter import *
class App():
def __init__(self):
root = Tk()
self.last_point = (0, 0)
self.prev_var = StringVar(value='-:-')
self.curr_var = StringVar(value='-:-')
labels = Frame(root)
labels.pack()
Label(labels, text='Last Point Clicked: ').pack(side=LEFT)
prev = Label(labels, textvariable=self.prev_var)
prev.pack(side=LEFT)
Label(labels, text='Current point: ').pack(side=LEFT)
curr = Label(labels, textvariable=self.curr_var)
curr.pack(side=LEFT)
self.canvas = Canvas(root, background='white')
self.canvas.pack()
self.canvas.bind('<Button-1>', self.on_click)
self.canvas.bind('<Motion>', self.on_motion)
self.line = self.canvas.create_line(0, 0, 0, 0)
self.curr_text = self.canvas.create_text(0, 0)
root.mainloop()
def on_click(self, event):
# Last click in absolute coordinates
self.prev_var.set('%s:%s' % self.last_point)
# Current point in relative coordinates
self.curr_var.set('%s:%s' % (event.x - self.last_point[0], event.y - self.last_point[1]))
self.last_point = event.x, event.y
def on_motion(self, event):
self.canvas.coords(self.line, self.last_point[0], self.last_point[1], event.x, event.y)
self.canvas.coords(self.curr_text, event.x, event.y)
self.canvas.itemconfigure(self.curr_text, text="%s\n%s\n\n\n" % (event.x - self.last_point[0], event.y - self.last_point[1]))
App()