我正在研究一种将垂直 IntSlider 的位置更改为 matplotlib 图右侧的方法。这是代码:

from ipywidgets import interact, fixed, IntSlider
import numpy as np
from matplotlib import pyplot as plt

%matplotlib notebook

fig = plt.figure(figsize=(8,4))

xs = np.random.random_integers(0, 5000, 50)
ys = np.random.random_integers(0, 5000, 50)

ax = fig.add_subplot(111)
scat, = ax.plot(xs, ys, 'kx', markersize=1)
ax.grid(which='both', color='.25', lw=.1)
ax.set_aspect('equal'), ax.set_title('Rotate')

def rotate(theta, xs, ys):
    new_xs = xs * np.cos(np.deg2rad(theta)) - ys * np.sin(np.deg2rad(theta))
    new_xs -= new_xs.min()
    new_ys = xs * np.sin(np.deg2rad(theta)) + ys * np.cos(np.deg2rad(theta))
    new_ys -= new_ys.min()
    return new_xs, new_ys

def update_plot(theta, xs, ys):
    new_xs, new_ys = rotate(theta, xs, ys)
    scat.set_xdata(new_xs), scat.set_ydata(new_ys)
    ax.set_xlim(new_xs.min() - 500, new_xs.max() + 500)
    ax.set_ylim(new_ys.min() - 500, new_ys.max() + 500)

w = interact(update_plot,
             theta=IntSlider(min=-180, max=180, step=5,value=0, orientation='vertical'),
             xs=fixed(xs),
             ys=fixed(ys))

这就是我所拥有的:

python - 如何将 ipywidget 滑块的默认位置更改为 matplotlib 图形的一侧?-LMLPHP

这就是我要的:

python - 如何将 ipywidget 滑块的默认位置更改为 matplotlib 图形的一侧?-LMLPHP

可能有一种非常简单的方法可以做到这一点,但我无法弄清楚自己。

我试图将 figinteractive 小部件都放入 VBox 中,然后用 VBox 包装 IPython.display 但它没有用。

在示例中找不到直接的解决方案。

编辑1:

ipywidgets 提供了一个 Output() 类,用于捕获输出区域并在小部件上下文中使用它。

我会试着弄清楚如何使用它。

这是对象:
https://github.com/jupyter-widgets/ipywidgets/blob/master/ipywidgets/widgets/widget_output.py

最佳答案

您可以通过创建一个交互式小部件,然后将 children 加载到 HBox 中来解决此问题。交互式的子小部件遵循此约定; (widget_0, widget_1 ..., output) 其中元组的最后一个成员是控件小部件的输出。您可以在声明之前或之后定义 HBox 的布局。 Read more on the layouts available here

以下解决方案有几个注意事项;图形最初可能不会显示,您可能需要在它出现之前调整控件,其次,当使用 %matplotlib notebook 魔法时,控件可能会在更新时导致大量闪烁。除此之外,我认为这应该像你想要的那样工作;

from IPython.display import display
from ipywidgets import interactive, fixed, IntSlider, HBox, Layout
import numpy as np
import matplotlib.pylab as plt
%matplotlib notebook

def rotate(theta, xs, ys):
    new_xs = xs * np.cos(np.deg2rad(theta)) - ys * np.sin(np.deg2rad(theta))
    new_xs -= new_xs.min()
    new_ys = xs * np.sin(np.deg2rad(theta)) + ys * np.cos(np.deg2rad(theta))
    new_ys -= new_ys.min()
    return new_xs, new_ys

def update_plot(theta, xs, ys):
    fig = plt.figure(figsize=(8,4))
    ax = fig.add_subplot(111)
    scat, = ax.plot(xs, ys, 'kx', markersize=1)
    ax.grid(which='both', color='.25', lw=.1)
    ax.set_aspect('equal'), ax.set_title('Rotate')
    new_xs, new_ys = rotate(theta, xs, ys)
    scat.set_xdata(new_xs), scat.set_ydata(new_ys)
    ax.set_xlim(new_xs.min() - 500, new_xs.max() + 500)
    ax.set_ylim(new_ys.min() - 500, new_ys.max() + 500)

xs = np.random.randint(0, 5000, 50)
ys = np.random.randint(0, 5000, 50)
w = interactive(update_plot,
                theta=IntSlider(min=-180, max=180, step=5, value=0,orientation='vertical'),
                xs=fixed(xs),
                ys=fixed(ys))

# Define the layout here.
box_layout = Layout(display='flex', flex_flow='row', justify_content='space-between', align_items='center')

display(HBox([w.children[1],w.children[0]], layout=box_layout))

更新:

这是 ipywidgets gitter 中 Jason Grout 的解决方案。

from IPython.display import display, clear_output
from ipywidgets import interact, fixed, IntSlider, HBox, Layout, Output, VBox
import numpy as np
import matplotlib.pyplot as plt
%matplotlib inline

def rotate(theta, xs, ys):
    new_xs = xs * np.cos(np.deg2rad(theta)) - ys * np.sin(np.deg2rad(theta))
    new_xs -= new_xs.min()
    new_ys = xs * np.sin(np.deg2rad(theta)) + ys * np.cos(np.deg2rad(theta))
    new_ys -= new_ys.min()
    return new_xs, new_ys

out = Output(layout={'width': '300px', 'height': '300px'})

def update_plot(change):
    theta = change['new'] # new slider value
    with out:
        clear_output(wait=True)
        fig = plt.figure(figsize=(4,4))
        ax = fig.add_subplot(111)
        scat, = ax.plot(xs, ys, 'kx', markersize=1)
        ax.grid(which='both', color='.25', lw=.1)
        ax.set_aspect('equal'), ax.set_title('Rotate')
        new_xs, new_ys = rotate(theta, xs, ys)
        scat.set_xdata(new_xs), scat.set_ydata(new_ys)
        ax.set_xlim(new_xs.min() - 500, new_xs.max() + 500)
        ax.set_ylim(new_ys.min() - 500, new_ys.max() + 500)
        plt.show()

xs = np.random.randint(0, 5000, 50)
ys = np.random.randint(0, 5000, 50)

slider = IntSlider(min=-180, max=180, step=5, value=0, orientation='vertical')
slider.observe(update_plot, 'value')
update_plot({'new': slider.value})
display(HBox([out, slider]))

关于python - 如何将 ipywidget 滑块的默认位置更改为 matplotlib 图形的一侧?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/45464424/

10-12 23:57