Tkinter 删除定义坐标处的所有移动对象

Question

我有一些形状和一堆（数千条）移动线。每次都会创建线条并向下移动。如果它们的最高坐标是 200，我想删除它们。但是当我尝试这个时，所有 canvas 停止移动（其他形状和所有线停止并且所有线被删除）。我在这里需要帮助。我想要的是：线条将在某些 X 坐标处被删除，同时线条的创建和移动将继续动态进行，而不会停止或关闭任何进程。

class Flow:
    def __init__(self, tph, color, canvas):
        self.flows = []
        self.tph = tph
        self.color = color
        self.Xspeed = 10
        self.Yspeed = 0
        self.canvas = canvas

    def create_flow(self):
        for i in range(self.tph):
            self.flow = self.canvas.create_line(550, 50, 500, 52, fill=self.color, width=2)
            self.flows.append(self.flow)

        return self.flows
    
    def move_flow(self):
        for self.flow in self.flows:
            self.canvas.move(self.flow, self.Xspeed - randint(10, 30), self.Yspeed + randint(10, 20))

flow = Flow(10, "#976C3D", canvas)

def animate():
    flow.create_flow()
    flow.move_flow()

    canvas.after(100, animate)

animate()
tk.mainloop()

Answer 1

如果要删除y坐标> 200的线，可以修改move_flow()如下：

def move_flow(self):
    for flow in self.flows:
        coords = self.canvas.coords(flow)
        if coords[1] > 200:  # top y > 200
            self.canvas.delete(flow) # delete the canvas line item
            self.flows.remove(flow) # delete the item in self.flows as well
        else:
            self.canvas.move(flow, self.Xspeed-randint(10, 30), self.Yspeed+randint(10, 20))

Tkinter 删除定义坐标处的所有移动对象

Tkinter delete all moving objects at defined coords

python

user-interface

tkinter

tkinter-canvas