Fix the size of the hexagon outline

Author: seisman

pygmt/src/pygmtlogo.py

@@ -72,11 +72,9 @@ def _create_logo(  # noqa: PLR0915
         case "circle":
             symbol = "c"
             size_shape = r0 + r1
-            hex_factor = 1.0
         case "hexagon":
             symbol = "h"
-            size_shape = (r0 + 0.34) * 2
-            hex_factor = 1.1
+            size_shape = (r0 + r1) / np.cos(np.deg2rad(30))
 
     # Define wordmark
     font = "AvantGarde-Book"
@@ -174,8 +172,8 @@ def _compass_lines():
         y1, y2, y3 = r0 * cosx, r3 * cosx, (r2 + (r3 - r4)) * cosx
         # Coordinates of vectors in the format of (x_start, y_start, x_end, y_end).
         return [
-            (-r0 * hex_factor, 0, -r3, 0),  # left horizontal
-            (r3, 0, r0 * hex_factor, 0),  # right horizontal
+            (-r0, 0, -r3, 0),  # left horizontal
+            (r3, 0, r0, 0),  # right horizontal
             (-x1, y1, -x2, y2),  # upper left
             (-x1, -y1, -x2, -y2),  # lower left
             (x1, y1, x3, y3),  # upper right