Add test for asterisk tuple markers.

QuLogic · QuLogic · commit 0d3383428b20 · 2020-03-14T18:50:56.000-04:00
diff --git a/lib/matplotlib/tests/test_marker.py b/lib/matplotlib/tests/test_marker.py
@@ -84,3 +84,40 @@ def test_poly_marker(fig_test, fig_ref):
 
     ax_test.set(xlim=(-0.5, 5.5), ylim=(-0.5, 5.5))
     ax_ref.set(xlim=(-0.5, 5.5), ylim=(-0.5, 5.5))
+
+
+# The asterisk marker is really a star with 0-size inner circle, so the ends
+# are corners and get a slight bevel. The reference markers are just singular
+# lines without corners, so they have no bevel, and we need to add a slight
+# tolerance.
+@check_figures_equal(tol=1.45)
+def test_asterisk_marker(fig_test, fig_ref, request):
+    ax_test = fig_test.add_subplot()
+    ax_ref = fig_ref.add_subplot()
+
+    # Note, some reference sizes must be different because they have unit
+    # *length*, while asterisk markers are inscribed in a circle of unit
+    # *radius*. This introduces a factor of np.sqrt(2), but since size is
+    # squared, that becomes 2.
+    size = 20**2
+
+    def draw_ref_marker(y, style, size):
+        # As noted above, every line is doubled. Due to antialiasing, these
+        # doubled lines make a slight difference in the .png results.
+        ax_ref.scatter([y], [y], marker=UnsnappedMarkerStyle(style), s=size)
+        if request.getfixturevalue('ext') == 'png':
+            ax_ref.scatter([y], [y], marker=UnsnappedMarkerStyle(style),
+                           s=size)
+
+    # Plus
+    ax_test.scatter([0], [0], marker=(4, 2), s=size)
+    draw_ref_marker(0, '+', size)
+    ax_test.scatter([0.5], [0.5], marker=(4, 2, 0), s=size)
+    draw_ref_marker(0.5, '+', size)
+
+    # Cross
+    ax_test.scatter([1], [1], marker=(4, 2, 45), s=size)
+    draw_ref_marker(1, 'x', size/2)
+
+    ax_test.set(xlim=(-0.5, 1.5), ylim=(-0.5, 1.5))
+    ax_ref.set(xlim=(-0.5, 1.5), ylim=(-0.5, 1.5))
