Question

我想通过在textinput中输入多个bin来更新我的直方图的bin。在文本框中输入值后，应在单击按钮后更新直方图。

我的代码如下：

import matplotlib
matplotlib.use('module://kivy.garden.matplotlib.backend_kivy')
from kivy.app import App
from kivy.garden.matplotlib.backend_kivyagg import FigureCanvas, NavigationToolbar2Kivy
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.textinput import TextInput

import matplotlib.pyplot as plt
import csv

with open("c:/Users/Niels/Desktop/uranite_23_03_2017.csv", 'rb') as f:
    reader = csv.reader(f, delimiter=';')
    data = []
    for column in reader:
        data.append(column[1])

    results = data
    results = [int(i) for i in results]

bins = 200
plt.hist(results, bins=bins)
plt.title("Histogram")
plt.xlabel("Value")
plt.ylabel("Frequency")

fig = plt.gcf()
canvas = fig.canvas

def callback(self):

    global fig, results
    #bins = 50
    plt.hist(results,bins=bins)
    canvas.draw()

class HistogramApp(App):
    title = 'Histogram data'

    def build(self):
        fl = BoxLayout(orientation="vertical")

        self.btn1 = Button(text="Update", height=40, size_hint_y=None)
        self.btn1.bind(on_press=callback)

        self.tekstvak = TextInput(height=30, size_hint_y=None, multiline=False)

        nav1 = NavigationToolbar2Kivy(canvas)

        fl.add_widget(nav1.actionbar)
        fl.add_widget(canvas)
        fl.add_widget(self.tekstvak)
        fl.add_widget(self.btn1)
        return fl

if __name__ == '__main__':
    HistogramApp().run().

回调函数运行正常。如果我在此功能中手动输入分档，则直方图将按照应有的方式更新。但是如何通过在textinput中输入数字来实现呢？

Answer 1

您需要定义callback以便它接收二进制数作为参数，然后在将on_press事件绑定到按钮时提供TextInput文本属性。首先，callback

# Callback takes one argument that is the number of bins
def callback(bins):

    global fig, results
    # Clear the plot figure, otherwise you'll end up with multiple plots overlayed
    plt.clf()
    # Convert bins to integer. You may want to use try/except statements to check if bins is convertable to integer and, if not, handle the exception
    bins = int(bins)
    plt.hist(results,bins=bins)
    canvas.draw()

现在是HistogramApp：

class HistogramApp(App):
    title = 'Histogram data'

    def build(self):
        fl = BoxLayout(orientation="vertical")

        self.btn1 = Button(text="Update", height=40, size_hint_y=None)
        self.tekstvak = TextInput(height=30, size_hint_y=None, multiline=False)
        # Bind the on press event after defining self.tekstvak
        # Note the use of lambda so that we can provide our own
        # argument to the callback. The argument is simply the
        # reference to the TextInput instance text property
        self.btn1.bind(on_press=lambda x: callback(self.tekstvak.text))

        nav1 = NavigationToolbar2Kivy(canvas)

        fl.add_widget(nav1.actionbar)
        fl.add_widget(canvas)
        fl.add_widget(self.tekstvak)
        fl.add_widget(self.btn1)
        return fl

您甚至可以将相同的回调绑定到TextInput的on_text_validate事件。通过这种方式，您可以输入垃圾箱数量，按Enter键就可以了。

self.tekstvak.bind(on_text_validate=lambda x: callback(self.tekstvak.text))

通过textinput和按钮更新直方图（kivy）

1 个答案: