如何找到行进的距离Tkinter ButtonPress

Question

我可以跟踪用户点击的位置以及他们发布的位置，但我想跟踪行进的距离。

来自Tkinter进口* root = Tk（）

类DragCursor（）：

def __init__(self, location):
    self.label = location
    location.bind('<ButtonPress-1>', self.StartMove)
    location.bind('<ButtonRelease-1>', self.StopMove)


def StartMove(self, event):
    startx = event.x
    starty = event.y
    print [startx, starty]

def StopMove(self, event):
    self.StartMove
    stopx = event.x
    stopy = event.y
    print [stopx, stopy]



location = Canvas(root, width = 300, height = 300)
DragCursor(location)
location.pack()
root.mainloop()

Answer 1

您只需使用距离公式来确定xy平面中两点之间的距离，

此外，您需要包含某种实例变量，它将保存起点和终点的坐标，以便您可以在鼠标释放后计算它。

这几乎是您的代码，只需使用distancetraveled使用StopMove打印在self.positions末尾的新from Tkinter import * root = Tk() class DragCursor(): def __init__(self, location): self.label = location location.bind('<ButtonPress-1>', self.StartMove) location.bind('<ButtonRelease-1>', self.StopMove) self.positions = {} def StartMove(self, event): startx = event.x starty = event.y self.positions['start'] = (startx, starty) def StopMove(self, event): stopx = event.x stopy = event.y self.positions['stop'] = (stopx, stopy) print self.distancetraveled() def distancetraveled(self): x1 = self.positions['start'][0] x2 = self.positions['stop'][0] y1 = self.positions['start'][1] y2 = self.positions['stop'][1] return ((x2-x1)**2 + (y2-y1)**2)**0.5 location = Canvas(root, width = 300, height = 300) DragCursor(location) location.pack() root.mainloop() 函数。

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