import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import CheckButtons,AxesWidget

class PremiumCheckButtons(CheckButtons,AxesWidget):
    def __init__(self, ax, labels, actives, linecolor="k", showedge=True, **kw):
        AxesWidget.__init__(self, ax)

        ax.set_xticks([])
        ax.set_yticks([])
        ax.set_navigate(False)
        if not showedge:
            ax.axis("off")
        linekw = {'solid_capstyle': 'butt', "color" : linecolor}
        class Handler(object):
            def legend_artist(self, legend, orig_handle, fontsize, handlebox):
                x0, y0 = handlebox.xdescent, handlebox.ydescent
                height = handlebox.height
                self.line1 = plt.Line2D([x0,x0+height],[y0,y0+height], **linekw)
                self.line2 = plt.Line2D([x0,x0+height],[y0+height,y0], **linekw)
                self.rect = plt.Rectangle((x0,y0),height, height,
                                          edgecolor="k", fill=False)
                handlebox.add_artist(self.rect)
                handlebox.add_artist(self.line1)
                handlebox.add_artist(self.line2)
                return [self.line1, self.line2, self.rect]

        self.box = ax.legend(handles = [object() for i in labels ],
                             labels = labels,
                             handler_map={object: Handler()}, **kw)

        self.lines = [(h[0],h[1]) for h in self.box.legendHandles]
        self.rectangles = [h[2] for h in self.box.legendHandles]
        self.labels = self.box.texts

        for i,(l1,l2) in enumerate(self.lines):
            l1.set_visible(actives[i])
            l2.set_visible(actives[i])

        self.connect_event('button_press_event', self._clicked)

        self.cnt = 0
        self.observers = {}


t = np.arange(0.0, 2.0, 0.01)
s0 = np.sin(2*np.pi*t)
s1 = np.sin(4*np.pi*t)
s2 = np.sin(6*np.pi*t)

fig, (rax,ax) = plt.subplots(nrows=2, gridspec_kw=dict(height_ratios = [0.1,1]) )
l0, = ax.plot(t, s0, visible=False, lw=2)
l1, = ax.plot(t, s1, lw=2)
l2, = ax.plot(t, s2, lw=2)
plt.subplots_adjust(left=0.2)

check = PremiumCheckButtons(rax, ('2 Hz', '4 Hz', '6 Hz'), (False, True, True),
                           showedge = False, ncol=3)


def func(label):
    if label == '2 Hz':
        l0.set_visible(not l0.get_visible())
    elif label == '4 Hz':
        l1.set_visible(not l1.get_visible())
    elif label == '6 Hz':
        l2.set_visible(not l2.get_visible())
    fig.canvas.draw_idle()
check.on_clicked(func)

plt.show()