snippet25.py

def make_box_layout():
     return widgets.Layout(
        border='solid 1px black',
        margin='0px 10px 10px 0px',
        padding='5px 5px 5px 5px'
     )
 
class Sines(widgets.HBox):
     
    def __init__(self):
        super().__init__()
        output = widgets.Output()
 
        self.x = np.linspace(0, 2 * np.pi, 100)
        initial_color = '#FF00DD'
 
        with output:
            self.fig, self.ax = plt.subplots(constrained_layout=True, figsize=(5, 3.5))
        self.line, = self.ax.plot(self.x, np.sin(self.x), initial_color)
         
        self.fig.canvas.toolbar_position = 'bottom'
        self.ax.grid(True)
 
        # define widgets
        int_slider = widgets.IntSlider(
            value=1, 
            min=0, 
            max=10, 
            step=1, 
            description='freq'
        )
        color_picker = widgets.ColorPicker(
            value=initial_color, 
            description='pick a color'
        )
        text_xlabel = widgets.Text(
            value='', 
            description='xlabel', 
            continuous_update=False
        )
        text_ylabel = widgets.Text(
            value='', 
            description='ylabel', 
            continuous_update=False
        )
 
        controls = widgets.VBox([
            int_slider, 
            color_picker, 
            text_xlabel, 
            text_ylabel
        ])
        controls.layout = make_box_layout()
         
        out_box = widgets.Box([output])
        output.layout = make_box_layout()
 
        # observe stuff
        int_slider.observe(self.update, 'value')
        color_picker.observe(self.line_color, 'value')
        text_xlabel.observe(self.update_xlabel, 'value')
        text_ylabel.observe(self.update_ylabel, 'value')
         
        text_xlabel.value = 'x'
        text_ylabel.value = 'y'
         
 
        # add to children
        self.children = [controls, output]
     
    def update(self, change):
        """Draw line in plot"""
        self.line.set_ydata(np.sin(change.new * self.x))
        self.fig.canvas.draw()
 
    def line_color(self, change):
        self.line.set_color(change.new)
 
    def update_xlabel(self, change):
        self.ax.set_xlabel(change.new)
 
    def update_ylabel(self, change):
        self.ax.set_ylabel(change.new)
         
         
Sines()