respect ellipse rotation

Fixes #256.

Author: nschloe

matplotlib2tikz/patch.py

@@ -124,6 +124,11 @@ def _draw_ellipse(data, obj, draw_options):
         return _draw_circle(data, obj, draw_options)
     x, y = obj.center
     ff = data["float format"]
+
+    if obj.angle != 0:
+        fmt = "rotate around={{" + ff + ":(axis cs:" + ff + "," + ff + ")}}"
+        draw_options.append(fmt.format(obj.angle, x, y))
+
     cont = (
         "\\draw[{}] (axis cs:"
         + ff

test/test_rotated_ellipse.py

@@ -0,0 +1,37 @@
+# -*- coding: utf-8 -*-
+#
+import matplotlib.pyplot as plt
+from matplotlib.patches import Ellipse
+
+from helpers import assert_equality
+
+
+def plot():
+    fig = plt.figure()
+
+    x = 1.0
+    y = 1.0
+
+    plt.plot(x, y, "ro")
+
+    ellip = Ellipse(
+        xy=[x, y], width=16.0, height=4.0, angle=-160, alpha=0.5, color="green"
+    )
+    ax = plt.gca()
+    ax.add_artist(ellip)
+
+    plt.xlim([-9, 10])
+    plt.ylim([-3, 5])
+    return fig
+
+
+def test():
+    assert_equality(plot, __file__[:-3] + "_reference.tex")
+    return
+
+
+if __name__ == "__main__":
+    import helpers
+
+    helpers.compare_mpl_latex(plot)
+    # helpers.print_tree(plot())

test/test_rotated_ellipse_reference.tex

@@ -0,0 +1,18 @@
+\begin{tikzpicture}
+
+\begin{axis}[
+tick align=outside,
+tick pos=left,
+x grid style={white!69.01960784313725!black},
+xmin=-9, xmax=10,
+y grid style={white!69.01960784313725!black},
+ymin=-3, ymax=5
+]
+\draw[draw=green!50.19607843137255!black,fill=green!50.19607843137255!black,opacity=0.5,rotate around={-160:(axis cs:1,1)}] (axis cs:1,1) ellipse (8 and 2);
+\addplot [semithick, red, mark=*, mark size=3, mark options={solid}, only marks]
+table {%
+1 1
+};
+\end{axis}
+
+\end{tikzpicture}