Replace text alignment with matplotlib generated figure

Author: rougier

Diff for: reference-alignments.py

@@ -0,0 +1,71 @@
+# ----------------------------------------------------------------------------
+# Title:   Scientific Visualisation - Python & Matplotlib
+# Author:  Nicolas P. Rougier
+# License: BSD
+# ----------------------------------------------------------------------------
+import numpy as np
+import matplotlib.pyplot as plt
+
+dpi = 100
+fig = plt.figure(figsize=(4.25, 1.5), dpi=dpi)
+ax = fig.add_axes([0,0,1,1], frameon=False,
+                  xlim=(0,4.25), ylim=(0,1.5), xticks=[], yticks=[])
+
+fontsize = 48
+renderer = fig.canvas.get_renderer()
+horizontalalignment = "left"
+verticalalignment = "center"
+position = (0.25, 1.5/2)
+color = "0.25"
+
+# Compute vertical and horizontal alignment offsets
+text = ax.text(0, 0, "Matplotlib", fontsize=fontsize)
+yoffset = {}
+for alignment in ["top", "center", "baseline", "bottom"]:
+    text.set_verticalalignment(alignment)
+    y = text.get_window_extent(renderer).y0/dpi
+    yoffset[alignment] = y
+
+xoffset = {}
+for alignment in ["left", "center", "right"]:
+    text.set_horizontalalignment(alignment)
+    x = text.get_window_extent(renderer).x0/dpi
+    xoffset[alignment] = x
+
+# Actual positioning of the text
+text.set_horizontalalignment(horizontalalignment)
+text.set_verticalalignment(verticalalignment)
+text.set_position(position)
+
+
+for name,y in yoffset.items():
+    y = position[1] - y + yoffset[verticalalignment]
+    plt.plot([0.1, 3.75], [y, y], linewidth=0.5, color=color)
+    plt.text(3.75, y, " "+name, color=color,
+             ha="left", va="center", size="x-small")
+
+for name,x in xoffset.items():
+    x = position[0] - x + xoffset[horizontalalignment]
+    plt.plot([x,x], [0.25, 1.25], linewidth=0.5, color=color)
+    plt.text(x, 0.24, name, color = color,
+             ha="center", va="top", size="x-small")
+
+P = []
+for x in xoffset.values():
+    x = position[0] - x + xoffset[horizontalalignment]
+    for y in yoffset.values():
+        y = position[1] - y + yoffset[verticalalignment]
+        P.append((x,y))
+P = np.array(P)
+
+ax.scatter(P[:,0], P[:,1], s=10, zorder=10,
+           facecolor="white", edgecolor=color, linewidth=0.75)
+
+epsilon = 0.05
+plt.text(P[3,0]+epsilon, P[3,1]-epsilon, "(0,0)",
+         color=color, ha="left", va="top", size="x-small")
+plt.text(P[8,0]-epsilon, P[8,1]+epsilon, "(1,1)",
+         color=color, ha="right", va="bottom", size="x-small")
+
+plt.savefig("text-alignments.pdf", dpi=600)
+plt.show()