Issues with corner label positions under panning/zooming about python-ternary HOT 4 OPEN

...
tax.right_corner_label(1)
tax.top_corner_label(2)
tax.left_corner_label(3)

tax._redraw_labels()  # <------- This you have to add before calling plt.show()
plt.show()

...
tax.right_corner_label(1)
tax.top_corner_label(2)
tax.left_corner_label(3)

# plt.show <----- This is commented. Instead tax.show() is called.
tax.show()

'''
The labels are still incorrectly positioned after panning/zooming. They should be positioned at the 
vertices of the triangle, but appear to be fixed to the UI layer.
'''

Inside python-ternary/ternary/ternary_axes_subplot.py --> class TernaryAxesSubplot(object): --> def _redraw_labels(self):

transform = ax.transAxes
text = ax.text(x, y, label, rotation=new_rotation,transform=transform, horizontalalignment="center",**kwargs)

import matplotlib.pyplot as plt

fig = plt.figure()
fig.suptitle('bold figure suptitle', fontsize=14, fontweight='bold')
ax = fig.add_subplot()
fig.subplots_adjust(top=0.85)
ax.set_title('axes title')
ax.set_xlabel('xlabel')
ax.set_ylabel('ylabel')
ax.text(3, 8, 'boxed italics text in data coords', style='italic',
        bbox={'facecolor': 'red', 'alpha': 0.5, 'pad': 10})
ax.text(2, 6, r'an equation: $E=mc^2$', fontsize=15)
ax.text(3, 2, 'Unicode: Institut f\374r Festk\366rperphysik')
ax.text(0.95, 0.01, 'colored text in axes coords',
        verticalalignment='bottom', horizontalalignment='right',
        transform=ax.transAxes,
        color='green', fontsize=15)
ax.plot([2], [1], 'o')
ax.annotate('annotate', xy=(2, 1), xytext=(3, 4),
            arrowprops=dict(facecolor='black', shrink=0.05))
ax.set(xlim=(0, 10), ylim=(0, 10))
plt.show()

import ternary
 
scale = 100
figure, tax = ternary.figure(scale=scale)

# Draw Boundary and Gridlines
tax.boundary(linewidth=2.0)
tax.gridlines(color="blue", multiple=5)

# Set Axis labels and Title
fontsize = 12
tax.set_title("Various Lines\n", fontsize=fontsize, pad=20)
tax.right_corner_label("X", fontsize=fontsize)
tax.top_corner_label("Y", fontsize=fontsize)
tax.left_corner_label("Z", fontsize=fontsize)
tax.left_axis_label("Left label $\\alpha^2$", fontsize=fontsize)
tax.right_axis_label("Right label $\\beta^2$", fontsize=fontsize)
tax.bottom_axis_label("Bottom label $\\Gamma - \\Omega$", fontsize=fontsize)

# Draw lines parallel to the axes
tax.horizontal_line(16)
tax.left_parallel_line(10, linewidth=2., color='red', linestyle="--")
tax.right_parallel_line(20, linewidth=3., color='blue')

# Draw an arbitrary line, ternary will project the points for you
p1 = (22, 8, 10)
p2 = (2, 22, 16)
tax.line(p1, p2, linewidth=3., marker='s', color='green', linestyle=":")

tax.ticks(axis='lbr', multiple=5, linewidth=1, offset=0.025)
# tax.get_axes().axis('off')
# tax.clear_matplotlib_ticks()
tax.show()

 def _redraw_labels(self):
        """Redraw axis labels, typically after draw or resize events."""
        ax = self.get_axes()
        # Remove any previous labels
        for mpl_object in self._to_remove:
            mpl_object.remove()
        self._to_remove = []
        # Redraw the labels with the appropriate angles
        label_data = list(self._labels.values())
        label_data.extend(self._corner_labels.values())
        ScaleMatrix = np.array([[self._scale,0],[0,self._scale],[0,0]]) # <--- This matrix is the scaling matrix
        for (label, position, rotation, kwargs) in label_data:
            # transform = ax.transAxes  # <---- Comment the change to axes-coordinate
            # x, y = project_point(position) # <--- Transform the triangular-coordinates to Eucledian coordinate
            transform = ax.transData # <---- I want to be in the data coordinate
            x, y = project_point(np.dot(position,ScaleMatrix)) # <--- Before the coordinate transformation, scale the data using the scaling matrix
            # Calculate the new angle.
            position = np.array([x, y])
            new_rotation = ax.transData.transform_angles(
                np.array((rotation,)), position.reshape((1, 2)))[0]
            text = ax.text(x, y, label, rotation=new_rotation,
                           transform=transform, horizontalalignment="center",
                           **kwargs)
            text.set_rotation_mode("anchor")
            self._to_remove.append(text)

...
if not position:
            #position = (-offset / 2, 1 + offset, 0)  # <--- Old poition
            position = (-offset*0.5/2, 1 + offset*0.5, 0) # <-- New position
...

...
if not position:
            #position = (-offset / 2, offset / 2, 0) # <--- Old poition
            position = (-0.5*offset / 2, -2*offset / 2, 0) # <-- New position
...

if not position:
            #position =  (1, offset / 2, 0) # <--- Old poition
            position = (1+ 2.5*offset /2, -2*offset / 2, 0) # <-- New position
...

if not position:
            #position =  (0.5, -offset / 2., 0.5) # <--- Old poition
            position = (0.5, -15*offset / 2., 0.5) # <-- New position
...

if not position:
            #position =  (2. / 5 + offset, 3. / 5, 0) # <--- Old poition
            position = (2. / 5 + 1.5*offset, 3. / 5, 0) # <-- New position
...

if not position:
            #position =  (-offset, 3./5, 2./5) # <--- Old poition
            position = (-1.5*offset, 3./5, 2./5) # <-- New position
...

import ternary

scale = 40
figure, tax = ternary.figure(scale=scale)

# Draw Boundary and Gridlines
tax.boundary(linewidth=2.0)
tax.gridlines(color="blue", multiple=5)

#---------- do not label using tax functions --------------
# # Set Axis labels and Title
# fontsize = 12
# tax.set_title("Various Lines\n", fontsize=fontsize, pad=20)
# tax.right_corner_label("X", fontsize=fontsize)
# tax.top_corner_label("Y", fontsize=fontsize)
# tax.left_corner_label("Z", fontsize=fontsize)
# tax.left_axis_label("Left label $\\alpha^2$", fontsize=fontsize)
# tax.right_axis_label("Right label $\\beta^2$", fontsize=fontsize)
# tax.bottom_axis_label("Bottom label $\\Gamma - \\Omega$", fontsize=fontsize)

# ------ get the matplotlib axis and add the text on it using data coordinate------------------
# This is just one example
BOTTOMPOS = ternary.helpers.project_point([0.5,-0.2]) * scale  # <-- The project_point() changes the triangular coordinate to Eucledian coordinate.
tax.get_axes().text(BOTTOMPOS[0],BOTTOMPOS[1],"Bottom label $\\Gamma - \\Omega$")

# Draw lines parallel to the axes
tax.horizontal_line(16)
tax.left_parallel_line(10, linewidth=2., color='red', linestyle="--")
tax.right_parallel_line(20, linewidth=3., color='blue')

# Draw an arbitrary line, ternary will project the points for you
p1 = (22, 8, 10)
p2 = (2, 22, 16)
tax.line(p1, p2, linewidth=3., marker='s', color='green', linestyle=":")

tax.ticks(axis='lbr', multiple=5, linewidth=1, offset=0.025)
tax.get_axes().axis('off')
tax.clear_matplotlib_ticks()
tax.show()