add genelabel rotation (customize x and y for rotation with angle 0)

jcvi/graphics/synteny.py

@@ -196,6 +196,7 @@ def __init__(
         loc_label=True,
         gene_labels: Optional[set] = None,
         genelabelsize=0,
+        genelabelrotation=25,
         pad=0.05,
         vpad=0.015,
         extra_features=None,
@@ -280,7 +281,7 @@ def __init__(
                     y + height / 2 + genelabelsize * vpad / 3,
                     markup(gene_name),
                     size=genelabelsize,
-                    rotation=25,
+                    rotation=genelabelrotation,
                     ha="left",
                     va="center",
                     color="lightslategray",
@@ -602,6 +603,13 @@ def main():
         + "However, plot may appear visually crowded. "
         + "Reasonably good values are 2 to 6 [Default: disabled]",
     )
+    p.add_option(
+        "--genelabelrotation",
+        default=25,
+        type="int",
+        help="Rotate gene labels at this angle (anti-clockwise), useful for debugging. "
+        + "[Default: 25]",
+    )
     p.add_option(
         "--scalebar",
         default=False,
@@ -650,6 +658,7 @@ def main():
         extra_features=opts.extra,
         gene_labels=gene_labels,
         genelabelsize=opts.genelabelsize,
+        genelabelrotation=opts.genelabelrotation,
         scalebar=opts.scalebar,
         shadestyle=opts.shadestyle,
         glyphstyle=opts.glyphstyle,