Reflect event handling on multiple subplots

Question

I am trying to create a interactive plot containing 4 subplots. Ideally clicking on one of the subplots would result the same (mirror click) in the rest of them.

Unt

Answer 1

Annotating several images at once is not possible with the mpldatacursor package you use. But you may write your own "datacursor", which annotates the images.

This could then look as follows.

import matplotlib.pyplot as plt
import numpy as np

fig, ((ax1,ax2),(ax3,ax4)) = plt.subplots(nrows=2, 
                                          ncols=2,sharex=True, sharey=True)
plt.subplots_adjust(wspace=0.08, hspace=0.08)
ax1.imshow(np.random.random((10,10)))
ax2.imshow(np.random.random((10,10)))
ax3.imshow(np.random.random((10,10)))
ax4.imshow(np.random.random((10,10)))

class ImageCursor():
    def __init__(self, axes, fmt='x:{x}\ny:{y}\nz:{z:.3f}'):
        self.fmt = fmt
        self.axes = axes
        self.fig = self.axes[0].figure
        self.ims = []
        self.annot = []
        for ax in self.axes:
            ax.images[0].set_picker(True)
            self.ims.append(ax.images[0])
            annot = ax.annotate("",xy=(0,0), xytext=(-30,30),
                                textcoords="offset points",
                                arrowprops=dict(arrowstyle="->",color="w",
                                                connectionstyle="arc3"),
                                va="bottom", ha="left", fontsize=10,
                                bbox=dict(boxstyle="round", fc="w"),)
            annot.set_visible(False)
            self.annot.append(annot)
        self.cid = self.fig.canvas.mpl_connect("pick_event", self.pick)

    def pick(self,event):
        e = event.mouseevent
        if e.inaxes:
            x,y = int(np.round(e.xdata)), int(np.round(e.ydata))
            self.annotate((x,y))
    def annotate(self,X):
        for annot, im in zip(self.annot, self.ims):
            z = im.get_array()[X[1],X[0]]
            annot.set_visible(True)
            annot.set_text(self.fmt.format(x=X[0],y=X[1],z=z))
            annot.xy = X
        self.fig.canvas.draw_idle()

ic = ImageCursor([ax1,ax2,ax3,ax4])            

plt.show()