# 7 examples of 'matplotlib equal axis' in Python

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 10 def set_axes_equal(ax): 11 '''Make axes of 3D plot have equal scale so that spheres appear as spheres, 12 cubes as cubes, etc.. This is one possible solution to Matplotlib's 13 ax.set_aspect('equal') and ax.axis('equal') not working for 3D. 14 15 Input 16 ax: a matplotlib axis, e.g., as output from plt.gca(). 17 ''' 18 19 x_limits = ax.get_xlim3d() 20 y_limits = ax.get_ylim3d() 21 z_limits = ax.get_zlim3d() 22 23 x_range = abs(x_limits[1] - x_limits[0]) 24 x_middle = np.mean(x_limits) 25 y_range = abs(y_limits[1] - y_limits[0]) 26 y_middle = np.mean(y_limits) 27 z_range = abs(z_limits[1] - z_limits[0]) 28 z_middle = np.mean(z_limits) 29 30 # The plot bounding box is a sphere in the sense of the infinity 31 # norm, hence I call half the max range the plot radius. 32 plot_radius = 0.5*max([x_range, y_range, z_range]) 33 34 ax.set_xlim3d([x_middle - plot_radius, x_middle + plot_radius]) 35 ax.set_ylim3d([y_middle - plot_radius, y_middle + plot_radius]) 36 ax.set_zlim3d([z_middle - plot_radius, z_middle + plot_radius])
 104 def setup_axis(X, Y, ax=None, fig=None, ylims=None): 105 """Setup axis, including timer for animation or snaps 106 107 Parameters 108 ---------- 109 X : 110 space disctretization to get limits 111 Y : 112 solution to get limits 113 ax : 114 ax where to put everything, if None current axes are used (Default value = None) 115 fig : 116 fig where to put everything, if None current figure is used (Default value = None) 117 ylims : 118 custom ylims, if None y axis limits are calculated from Y (Default value = None) 119 120 Returns 121 ------- 122 ax 123 124 fig 125 126 time_text 127 object to fill in text 128 129 """ 130 if ax is None: 131 fig = plt.gcf() 132 ax = plt.gca() 133 if ylims is None: 134 lowery = nm.min(Y) - nm.min(Y) / 10 135 uppery = nm.max(Y) + nm.max(Y) / 10 136 else: 137 lowery = ylims[0] 138 uppery = ylims[1] 139 ax.set_ylim(lowery, uppery) 140 ax.set_xlim(X[0], X[-1]) 141 time_text = ax.text(X[0] + nm.sign(X[0]) * X[0] / 10, 142 uppery - uppery / 10, 143 'empty', fontsize=15) 144 return ax, fig, time_text
 20 def square_axis(axes=None): 21 """ 22 Expands the x- and y-limits on the given axes so that they are equal 23 (defaults to the current axes). 24 """ 25 if axes is None: 26 axes = gca() 27 tmpv = axes.axis() 28 xmax = max([tmpv[1], tmpv[3]]) 29 xmin = min([tmpv[0], tmpv[2]]) 30 axes.axis([xmin, xmax, xmin, xmax])
 327 def draw_axes3(self, *args, **kwargs): 328 """ Graphics package draw plot axes for 3D space. 329 """ 330 print("* Not yet implemented.") 331 return None
 396 def set_default_locators_and_formatters(self, axis): 397 """ 398 Set the locators and formatters to specialized versions for 399 symmetrical log scaling. 400 """ 401 axis.set_major_locator(SymmetricalLogLocator(self.get_transform())) 402 axis.set_major_formatter(LogFormatterMathtext(self.base)) 403 axis.set_minor_locator(SymmetricalLogLocator(self.get_transform(), self.subs)) 404 axis.set_minor_formatter(NullFormatter())
 372 def set_axis_labels ( self , x ) : 373 pass
 87 @staticmethod 88 def set_axes_equal(ax): 89 """ Sets equal aspect ratio across the three axes of a 3D plot. 90 91 Contributed by Xuefeng Zhao. 92 93 :param ax: a Matplotlib axis, e.g., as output from plt.gca(). 94 """ 95 bounds = [ax.get_xlim3d(), ax.get_ylim3d(), ax.get_zlim3d()] 96 ranges = [abs(bound[1] - bound[0]) for bound in bounds] 97 centers = [np.mean(bound) for bound in bounds] 98 radius = 0.5 * max(ranges) 99 lower_limits = centers - radius 100 upper_limits = centers + radius 101 ax.set_xlim3d([lower_limits[0], upper_limits[0]]) 102 ax.set_ylim3d([lower_limits[1], upper_limits[1]]) 103 ax.set_zlim3d([lower_limits[2], upper_limits[2]])