def triangular_axes(fig): # ternary projection tr = Affine2D.from_values(1., 0, 0.5, np.sqrt(3)/2., 0, 0) # negative ternary projection for dependent axis neg_tr = Affine2D.from_values(1., 0, -0.5, np.sqrt(3)/2., 0, 0) # identity transform identity_tr = Affine2D.from_values(1, 0, 0, 1, 0, 0) grid_helper = GridHelperTriangular(tr, extremes=(0,1,0,1), grid_type="independent") # use null_locator to kill extra horizontal gridlines from dependent axis null_locator = grid_finder.MaxNLocator(1) dep_grid_helper = GridHelperTriangular(neg_tr, extremes=(0,1,0,1), grid_type="dependent", grid_locator2=null_locator) # Add independent axes with gridlines ax1 = floating_axes.FloatingSubplot(fig, 111, grid_helper=grid_helper) fig.add_subplot(ax1) ax1.axis[:].set_visible(False) ax1.axis["bottom"].set_visible(True) ax1.axis["left"].set_visible(True) # Add dependent axis with gridlines ax2 = ParasiteAxesAuxTrans(ax1, identity_tr, "equal", grid_helper=dep_grid_helper) ax2.axis["right"] = ax2.get_grid_helper().new_floating_axis(0, 1, axes=ax1) ax2.axis["right"].toggle(ticklabels=False) ax1.parasites.append(ax2) ax1.grid(True) ax2.grid(True) ax1.plot([]) ax1.set_aspect(1.) return ax1
