[英]How to plot circle with scalable radius?
I wrote a few lines of code that should draw a circle where I can adjust its radius by using a slider. 我写了几行代码,应该画一个圆,在这里我可以使用滑块调整其半径。 Unfortunately there must be some major mistakes in my code but as I am a beginner it is hard to find them. 不幸的是,我的代码中肯定存在一些重大错误,但是由于我是初学者,所以很难找到它们。 Can anyone give me some advise to make it work? 谁能给我一些建议使其工作?
A tiny GUI has been set up using tkinter including a Tk.Scale
and a canvas. 已经使用Tk.Scale
设置了一个很小的GUI,其中包括Tk.Scale
和画布。 The function drawCircle
creates a Circle
artist. 函数drawCircle
创建一个Circle
艺术家。 The essential part is connecting the slider with the function changeRadius
but thats where I don't know what to do. 基本部分是将滑块与功能changeRadius
连接changeRadius
但是那是我不知道该怎么做的地方。 See my code below... 请参阅下面的代码...
import sys
if sys.version_info[0] < 3:
import Tkinter as Tk
else:
import tkinter as Tk
from matplotlib.figure import Figure
from matplotlib import pyplot as plt
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
class PlotCircle():
def __init__(self, master):
self.master = master
master.iconify
self.f_rad = 2 # initial value
self.frame = Tk.Frame(master)
self.frame.pack(side=Tk.TOP, fill=Tk.BOTH, expand=0)
self.radius_label = Tk.Label(self.frame, text='Radius: ')
self.radius_label.pack(side=Tk.LEFT)
self.scroll_radius = Tk.Scale(self.frame, from_=1.0, to=3.0, resolution=0.05,
orient=Tk.HORIZONTAL, command=lambda:self.changeRadius(self.circle))
self.scroll_radius.set(2.0)
self.scroll_radius.pack(side=Tk.LEFT)
self.image_frame = Tk.Frame(master)
self.image_frame.pack(side=Tk.TOP, fill=Tk.BOTH, expand=1)
self.fig = Figure()
self.ax = self.fig.add_subplot(111)
self.ax.set_aspect('equal')
self.canvas = FigureCanvasTkAgg(self.fig, self.image_frame)
self.canvas.get_tk_widget().pack(side=Tk.TOP, fill=Tk.BOTH, expand=1)
self.canvas._tkcanvas.pack(side=Tk.TOP, fill=Tk.BOTH, expand=1)
def drawCircle(self):
self.circle = plt.Circle((0.5, 0.5), self.f_rad*0.1, color='#F97306', fill=False)
self.ax.add_artist(self.circle)
self.fig.canvas.draw()
def changeRadius(self, circ):
self.f_rad = float(self.scroll_radius.get())
print(self.f_rad)
circ.set_radius(self.f_rad)
self.fig.canvas.draw()
root = Tk.Tk()
PlotCircle(root)
root.mainloop()
By executing this code I get the following error: 通过执行此代码,我得到以下错误:
Exception in Tkinter callback Traceback (most recent call last): File "C:\\Users\\p.schulmeyer\\AppData\\Local\\Continuum\\anaconda3\\lib\\tkinter__init__.py", line 1705, in call return self.func(*args) TypeError: lambda() takes 0 positional arguments but 1 was given Tkinter回调回溯中的异常(最近一次调用最后一次):文件“ C:\\ Users \\ p.schulmeyer \\ AppData \\ Local \\ Continuum \\ anaconda3 \\ lib \\ tkinter__init __。py”,行1705,在调用返回self.func(* args )TypeError:lambda()接受0个位置参数,但给出了1个
I also tried using lambda e:
or not using lambda at all but nothing helped. 我也尝试使用lambda e:
或完全不使用lambda,但无济于事。 I guess my mistake must be something more fundamental. 我想我的错误一定是更根本的东西。 I really appreciate any help. 我非常感谢您的帮助。 Thanks! 谢谢!
You need to do the following changes to make your script work. 您需要进行以下更改才能使脚本正常工作。
command needs a function that can accept a param 命令需要一个可以接受参数的函数
def __init__(self, master): ... self.scroll_radius = Tk.Scale(self.frame, from_=1.0, to=3.0, resolution=0.05, orient=Tk.HORIZONTAL, command=lambda x:self.changeRadius(x)) ... self.drawCircle() def changeRadius(self, new_radius): self.circle.set_radius(float(new_radius)*0.1) self.fig.canvas.draw()
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