AttributeError: 'AxesSubplot' object 没有属性 'Circle' 在 tkinter 中嵌入 matplotlib

Question

I'm trying to embed an orbital simulation into a tkinter frame, I have the plot working properly I am now just trying to input circles into the graph to represent planets. I have had a look for documentation on how to draw circles in FigureCanvasTkAgg but can't find anything and was hoping someone could help.

Here's the code:

matplotlib.use('TkAgg')
root = Tk.Tk()
root.wm_title("Orbital Simulation")
fig = plt.Figure()
canvas = FigureCanvasTkAgg(fig, root)
canvas.get_tk_widget().pack(side=Tk.TOP, fill=Tk.BOTH, expand=1)

ax=fig.add_subplot(111)
fig.subplots_adjust(bottom=0.25)

gridArea = [0, 200, 0, 200]  # margins of the coordinate grid
ax.axis(gridArea)  # create new coordinate grid
ax.grid(b="on")  # place grid

.    
.
.

def placeObject(self):
    drawObject = ax.Circle(self.position, radius=self.radius, fill=False, color="black")
    ax.gca().add_patch(drawObject)
    ax.show()

Error:

drawObject = ax.Circle(self.position, radius=self.radius, fill=False, color="black") AttributeError: 'AxesSubplot' object has no attribute 'Circle'

Any help is greatly appreciated.

Answer 1

Axes instances do not have a Circle method. That is part of matplotlib.patches , and can be imported separately.

Also, when you add the patch to the ax , you don't need to do ax.gca() , since you already have a handle for the current Axes (ie no need to .gca() , which stands for get current axes).

Finally, Axes do not have a show() method. That is a function from the pyplot module, that can be called as plt.show()

If you don't have them already, add the following imports:

import matplotlib.pyplot as plt
from matplotlib.patches import Circle

And then modify your function to:

def placeObject(self):
    drawObject = Circle(self.position, radius=self.radius, fill=False, color="black")
    ax.add_patch(drawObject)
    plt.show()