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python - 使用实时数据创建的线条放大 tkinter 画布

问题描述

我是 Tkinter 的新手，并试图弄清楚如何能够在画布上放大和缩小，而不会弄乱由实时数据创建的画线。每秒都会绘制一条新线，并且应该连接到前一条线，但是如果我放大画布，则将绘制的下一条线不会连接到前一条线。似乎所有的线条都是基于一些窗口坐标绘制的（无论我放大或缩小多少都是一致的），而不是基于画布本身。我希望能够根据需要放大和缩小，并且仍然看到从画布的左上角到画布的右下角绘制的一条线。我试图提供一些代码以使其更易于理解。

import tkinter as tk
import threading
import time

root = tk.Tk()
pressed = False
flag_run = False

GRID_W = 500
GRID_H = 500

def thread_entry(name):
    print("<starting thread>")
    i = 0
    j = 0
    while flag_run:
        time.sleep(1)
        canvas.create_line(i, j, i+1, j+1, fill="red")
        i += 1
        j += 1
    print("<ending thread>")

def start():
    global flag_run
    flag_run = True
    global thread
    thread = threading.Thread(target=thread_entry, args=(1,))
    thread.start()

def stop():
    global flag_run
    if flag_run is True:
        flag_run = False
        global thread
        thread.join(timeout=0.1)

# move
def move_start(event):
    canvas.scan_mark(event.x, event.y)

def move_move(event):
    canvas.scan_dragto(event.x, event.y, gain=1)

# move
def pressed2(event):
    global pressed
    pressed = not pressed
    canvas.scan_mark(event.x, event.y)

def move_move2(event):
    if pressed:
        canvas.scan_dragto(event.x, event.y, gain=1)

# windows zoom
def zoomer(event):
    if (event.delta > 0):
        canvas.scale("all", event.x, event.y, 1.1, 1.1)
    elif (event.delta < 0):
        canvas.scale("all", event.x, event.y, 0.9, 0.9)
    canvas.configure(scrollregion = canvas.bbox("all"))

def zooming_in(event):
    canvas.scale("all", event.x, event.y, 1.1, 1.1)

def zooming_out(event):
    canvas.scale("all", event.x, event.y, 0.9, 0.9)

canvas = tk.Canvas(root, width=GRID_W, height=GRID_H, background="white")
canvas.grid(row=0, column=0, sticky="nsew")
root.grid_rowconfigure(0, weight=1)
root.grid_columnconfigure(0, weight=1)

for i in range(GRID_W//10 + 1):
    canvas.create_line(i*10, 0, i*10, GRID_H, fill="#c9c9c9")

for j in range(GRID_H//10 + 1):
    canvas.create_line(0, j*10, GRID_W, j*10, fill="#c9c9c9")

canvas.create_line(GRID_W // 2, 0, GRID_W // 2, GRID_H, fill="black", width=2)
canvas.create_line(0, GRID_H // 2, GRID_W, GRID_H // 2, fill="black", width=2)

canvas.bind("<ButtonPress-1>", move_start)
canvas.bind("<B1-Motion>", move_move)

canvas.bind("<ButtonPress-2>", pressed2)
canvas.bind("<Motion>", move_move2)

zoom_in = tk.Button(root, text="+")
zoom_in.grid(row=1, column=0)
zoom_in.bind("<Button-1>", zooming_in)

zoom_out = tk.Button(root, text="-")
zoom_out.grid(row=1, column=1)
zoom_out.bind("<Button-1>", zooming_out)

button = tk.Button(root, text="Start", command = start)
button.grid(row=2, column=0)

button_s = tk.Button(root, text="Stopp", command = stop)
button_s.grid(row=2, column=1)

root.mainloop()

我感谢我能得到的所有帮助和指导！

标签： pythoncanvastkinterzoomingandroid-livedata

解决方案

try stopping the flag_run while you hit the start button (zooming_in(event)) and continue when done zooming. try remembering where the line was, and keep logging the data while you zoom in and out so you are not missing any values as you currently do.

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