Python3 tkinter模擬量表

Question

我想用我的tkinter/ttk GUI編寫的Python 3.6模擬量規。

我需要它來顯示伏特和psi值。

我的研究至今使我this（linuxcnc/pyvcp？），this（的Perl/TK）和this（TK）。

我是否有機會整合這三者，或者我是否應該嘗試使用tkinter.Canvas來實現我自己的量表？

Answer 1

我創建了一個名爲tk_tools的軟件包，它具有這些模擬量規之一。

pip install tk_tools

來源：https://github.com/slightlynybbled/tk_tools

文檔：https://tk-tools.readthedocs.io/en/latest/docs/widgets/#rotaryscale

您正在尋找RotaryScale部件。使用示例可以在examples/rotary_scale.py中找到。簡短的版本：

import tkinter as tk 
import tk_tools 

root = tk.Tk() 

p = tk_tools.RotaryScale(root, max_value=100.0, unit='psi') 
p.grid() 

p.set_value(32.7) 

root.mainloop() 

Answer 2

我有翻譯在Python 3號之一：

import tkinter as tk 
from math import pi, cos, sin 


class Meter(tk.Frame): 
    def __init__(self, master=None, **kw): 
     tk.Frame.__init__(self, master, **kw) 

     self.meter = [] 
     self.angle = [] 
     self.var = tk.IntVar(self, 0) 

     self.canvas = tk.Canvas(self, width=200, height=110, 
           borderwidth=2, relief='sunken', 
           bg='white') 
     self.scale = tk.Scale(self, orient='horizontal', from_=0, to=100, variable=self.var) 

     for j, i in enumerate(range(0, 100, 5)): 
      self.meter.append(self.canvas.create_line(100, 100, 10, 100, 
                 fill='grey%i' % i, 
                 width=3, 
                 arrow='last')) 
      self.angle.append(0) 
      self.canvas.lower(self.meter[j]) 
      self.updateMeterLine(0.2, j) 

     self.canvas.create_arc(10, 10, 190, 190, extent=108, start=36, 
           style='arc', outline='red') 

     self.canvas.pack(fill='both') 
     self.scale.pack() 

     self.var.trace_add('write', self.updateMeter) # if this line raises an error, change it to the old way of adding a trace: self.var.trace('w', self.updateMeter) 
     self.updateMeterTimer() 

    def updateMeterLine(self, a, l=0): 
     """Draw a meter line (and recurse for lighter ones...)""" 
     oldangle = self.angle[l] 
     self.angle[l] = a 
     x = 100 - 90 * cos(a * pi) 
     y = 100 - 90 * sin(a * pi) 
     self.canvas.coords(self.meter[l], 100, 100, x, y) 
     l += 1 
     if l < len(self.meter): 
      self.updateMeterLine(oldangle, l) 

    def updateMeter(self, name1, name2, op): 
     """Convert variable to angle on trace""" 
     mini = self.scale.cget('from') 
     maxi = self.scale.cget('to') 
     pos = (self.var.get() - mini)/(maxi - mini) 
     self.updateMeterLine(pos * 0.6 + 0.2) 

    def updateMeterTimer(self): 
     """Fade over time""" 
     self.var.set(self.var.get()) 
     self.after(20, self.updateMeterTimer) 


if __name__ == '__main__': 
    root = tk.Tk() 
    meter = Meter(root) 
    meter.pack() 
    root.mainloop()