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Figure.pygmtlogo: Explicitly set the angle of diagonal compass lines for readability #4630

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Merged
seisman merged 1 commit into from
May 9, 2026
+9 −6
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Figure.pygmtlogo: Explicitly set the angle of diagonal compass lines for readability #4630

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15 changes: 9 additions & 6 deletions pygmt/src/pygmtlogo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -154,16 +154,19 @@ def _bg_arrow_coords():

def _compass_lines():
"""Coordinates of compass lines."""
sqrt2 = np.sqrt(2) / 2
x1, x2, x3 = r0 * sqrt2, r3 * sqrt2, (r2 + (r3 - r4)) * sqrt2
angle = np.deg2rad(45.0) # Angle of diagonal compass lines
sinx, cosx = np.sin(angle), np.cos(angle)

x1, x2, x3 = r0 * sinx, r3 * sinx, (r2 + (r3 - r4)) * sinx
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
(-x1, x1, -x2, x2), # upper left
(-x1, -x1, -x2, -x2), # lower left
(x1, x1, x3, x3), # upper right
(x1, -x1, x2, -x2), # lower right
(-x1, y1, -x2, y2), # upper left
(-x1, -y1, -x2, -y2), # lower left
(x1, y1, x3, y3), # upper right
(x1, -y1, x2, -y2), # lower right
]

def _vline_coords():
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