Kivy！在多個屏幕上加載matplot圖

Question

我我試圖從屏幕加載一個圖像從文件選擇器，並試圖顯示其他屏幕中的圖像的matplotlib圖 我已經使用Kivy_matplotlib庫 這裏是代碼

import numpy as np 
import matplotlib.widgets as widgets 
import PIL 
import matplotlib as mpl 
from matplotlib import pyplot as plt 
from PIL import Image 
from kivy.app import App 
from kivy.lang import Builder 
from kivy_matplotlib import MatplotFigure, MatplotNavToolbar 
from kivy.uix.screenmanager import ScreenManager, Screen 

kv = """ 
<ScreenTwo>: 
    id:sc1 
    BoxLayout: 
     FileChooserListView: 
      id: filechooser 
      on_selection: my_widget.selected(filechooser.selection) 
     Button: 
      text: "Go to Screen 1" 
      on_press: 
       root.manager.transition.direction = 'right' 
       root.manager.current = 'screen_one' 

<ScreenOne> 
    BoxLayout: 
     orientation: 'vertical' 
     Button: 
      text:"Choose File" 
      on_press: 
       root.manager.transition.direction = 'right' 
       root.manager.current = 'screen_two' 
     MatplotFigure: 
      id: figure_wgt 
      size_hint: 1, 0.9 
     MatplotNavToolbar: 
      id: navbar_wgt 
      size_hint: 1, 0.1 
      figure_widget: figure_wgt 
""" 

class ScreenOne(Screen): 
    pass 


class ScreenTwo(Screen): 
    pass 


# The ScreenManager controls moving between screens 
screen_manager = ScreenManager() 

# Add the screens to the manager and then supply a name 
# that is used to switch screens 
screen_manager.add_widget(ScreenOne(name="screen_one")) 
screen_manager.add_widget(ScreenTwo(name="screen_two")) 

class testApp(App): 
    title = "Test Matplotlib" 

    def build(self): 

     # Matplotlib stuff, figure and plot 
     fig = mpl.figure.Figure(figsize=(2, 2)) 

     def onselect(eclick, erelease): 
      if eclick.ydata>erelease.ydata: 
       eclick.ydata,erelease.ydata=erelease.ydata,eclick.ydata 
      if eclick.xdata>erelease.xdata: 
       eclick.xdata,erelease.xdata=erelease.xdata,eclick.xdata 
      ax.set_ylim(erelease.ydata,eclick.ydata) 
      ax.set_xlim(eclick.xdata,erelease.xdata) 
      fig.canvas.draw() 

     fig = plt.figure() 
     ax = fig.add_subplot(111) 
     filename="phase.jpg" 
     im = Image.open(filename) 
     arr = np.asarray(im) 
     plt_image=plt.imshow(arr) 
     rs=widgets.RectangleSelector(
      ax, onselect, drawtype='box', 
      rectprops = dict(facecolor='red', edgecolor = 'black', alpha=0.5, fill=True)) 
     #plt.show() 
     print(arr) 

     # Kivy stuff 
     root = Builder.load_string(kv) 
     figure_wgt = ScreenOne.ids['figure_wgt'] # MatplotFigure 
     figure_wgt.figure = fig 

     return screen_manager 

#testApp().run() 

sample_app = testApp() 
sample_app.run() 

我堅持，因爲我正在以下 回溯

/home/naveen/Environments/aagnaa/bin/python "/home/naveen/Py files/tut/select and crop2 (copy).py" 
[INFO    ] [Logger  ] Record log in /home/naveen/.kivy/logs/kivy_17-06-01_150.txt 
[INFO    ] [Kivy  ] v1.9.1 
[INFO    ] [Python  ] v3.5.2 (default, Nov 17 2016, 17:05:23) 
[GCC 5.4.0 20160609] 
[INFO    ] [Factory  ] 179 symbols loaded 
[INFO    ] [Image  ] Providers: img_tex, img_dds, img_gif, img_sdl2, img_pil (img_ffpyplayer ignored) 
[INFO    ] [OSC   ] using <multiprocessing> for socket 
[INFO    ] [Window  ] Provider: sdl2(['window_egl_rpi'] ignored) 
[INFO    ] [GL   ] OpenGL version <b'2.1 Mesa 12.0.6'> 
[INFO    ] [GL   ] OpenGL vendor <b'Intel Open Source Technology Center'> 
[INFO    ] [GL   ] OpenGL renderer <b'Mesa DRI Intel(R) Ironlake Mobile '> 
[INFO    ] [GL   ] OpenGL parsed version: 2, 1 
[INFO    ] [GL   ] Shading version <b'1.20'> 
[INFO    ] [GL   ] Texture max size <8192> 
[INFO    ] [GL   ] Texture max units <16> 
[INFO    ] [Window  ] auto add sdl2 input provider 
[INFO    ] [Window  ] virtual keyboard allowed, single mode, docked 

Traceback (most recent call last): 
    File "/home/naveen/Py files/tut/select and crop2 (copy).py", line 97, in <module> 
    sample_app.run() 
    File "/usr/lib/python3/dist-packages/kivy/app.py", line 802, in run 
    root = self.build() 
    File "/home/naveen/Py files/tut/select and crop2 (copy).py", line 89, in build 
    figure_wgt = ScreenOne.ids['figure_wgt'] # MatplotFigure 
TypeError: 'kivy.properties.DictProperty' object is not subscriptable 

Process finished with exit code 1 

需要幫助 在此先感謝

Answer 1

您需要重新排序代碼執行流程。您必須在添加小部件之前將字符串插入到語言生成器中。

kv = """ 
<ScreenTwo>: 
    id:sc1 
    BoxLayout: 
     FileChooserListView: 
      id: filechooser 
      on_selection: my_widget.selected(filechooser.selection) 
     Button: 
      text: "Go to Screen 1" 
      on_press: 
       root.manager.transition.direction = 'right' 
       root.manager.current = 'screen_one' 

<ScreenOne>: 
    BoxLayout: 
     orientation: 'vertical' 
     Button: 
      text:"Choose File" 
      on_press: 
       root.manager.transition.direction = 'right' 
       root.manager.current = 'screen_two' 
     MatplotFigure: 
      id: figure_wgt 
      size_hint: 1, 0.9 
     MatplotNavToolbar: 
      id: navbar_wgt 
      size_hint: 1, 0.1 
      figure_widget: figure_wgt 
""" 
# Insert string into Language builder. 
Builder.load_string(kv) 

class ScreenOne(Screen): 
    pass 

class ScreenTwo(Screen): 
    pass 

# The ScreenManager controls moving between screens 
screen_manager = ScreenManager() 
screen_manager.add_widget(ScreenOne(name="screen_one")) 
screen_manager.add_widget(ScreenTwo(name="screen_two")) 

class testApp(App): 
    title = "Test Matplotlib" 

    def build(self): 

     # .... 

     # get first screen and update figure 

     screen_one = screen_manager.get_screen('screen_one') 

     screen_one.ids['figure_wgt'].figure = fig 

     return screen_manager 


sample_app = testApp() 
sample_app.run()