我正在使用 tkinter 和 matplotlib 編寫腳本進(jìn)行數(shù)據(jù)處理，代碼的某些部分需要多邊形選擇器來(lái)選擇感興趣的區(qū)域。但是，PolygonSelector 無(wú)法檢測(cè)光標(biāo)的運(yùn)動(dòng)。需要注意的是，這個(gè)問題是在matplotlib圖形交互模式開啟的情況下出現(xiàn)的。簡(jiǎn)化代碼和結(jié)果如下所示：#!/usr/bin/env python3import matplotlibmatplotlib.use("TkAgg")import tkinter as tkimport matplotlib.pyplot as pltfrom matplotlib.widgets import PolygonSelectorroot = tk.Tk()def draw(): fig = plt.figure() ax = fig.add_subplot(111) plt.ion() # interactive mode is on plt.show() def onselect(data_input): print(data_input) PS = PolygonSelector(ax, onselect)tk.Button(root, text='draw', command=draw).pack()root.mainloop()這是在 tkinter GUI 上單擊“繪制”按鈕后的圖，多邊形的起點(diǎn)停留在 (0,0)，預(yù)計(jì)會(huì)隨光標(biāo)移動(dòng)：當(dāng)我draw()在 tkinter 之外調(diào)用時(shí)，PolygonSelector 工作正常：def draw(): fig = plt.figure() ax = fig.add_subplot(111) plt.ion() # interactive mode is on plt.show() def onselect(data_input): print(data_input) PS = PolygonSelector(ax, onselect) a = input() # prevent window from closing when execution is donedraw()
1 回答
牧羊人nacy
TA貢獻(xiàn)1862條經(jīng)驗(yàn) 獲得超7個(gè)贊
簡(jiǎn)單的解決方案是確保您將多邊形選擇器設(shè)為全局變量。這將使選擇器在視覺上保持更新。
#!/usr/bin/env python3
import tkinter as tk
import matplotlib
import matplotlib.pyplot as plt
from matplotlib.widgets import PolygonSelector
matplotlib.use("TkAgg")
root = tk.Tk()
ps = None
def draw():
global ps
fig = plt.figure()
ax = fig.add_subplot(111)
plt.ion()
plt.show()
ps = PolygonSelector(ax, on_select)
def on_select(data_input):
print(data_input)
tk.Button(root, text='draw', command=draw).pack()
root.mainloop()
如果將其構(gòu)建到類中，則可以避免使用 global 并通過將 Polygon Selector 作為類屬性應(yīng)用來(lái)獲得所需的行為。
#!/usr/bin/env python3
import tkinter as tk
import matplotlib
import matplotlib.pyplot as plt
from matplotlib.widgets import PolygonSelector
matplotlib.use("TkAgg")
class GUI(tk.Tk):
def __init__(self):
super().__init__()
self.ps = None
tk.Button(self, text='draw', command=self.draw).pack()
def draw(self):
fig = plt.figure()
ax = fig.add_subplot(111)
plt.ion()
plt.show()
self.ps = PolygonSelector(ax, self.on_select)
def on_select(self, data_input):
print(data_input)
if __name__ == "__main__":
GUI().mainloop()
結(jié)果：
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