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More marker fixes #307

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More marker fixes #307

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ca68822
Attempting to fix angles; consistency between cubic and quadratic arc…
Cardioid3 Nov 29, 2020
6af8cd9
Fix marker angle calculation (arithmetic mean may be 180 degrees off …
Cardioid3 Nov 30, 2020
87232dd
Fix degenerate Beziers
Cardioid3 Dec 1, 2020
ba2759c
Fix elliptic & rotated arc angles
Cardioid3 Dec 1, 2020
52e3993
Fix angles for M and z by breaking node.vertices into subpaths
Cardioid3 Dec 2, 2020
a2a06a8
Draw two markers on top of one another for closepaths in accordance w…
Cardioid3 Dec 17, 2020
0835fc8
Markers were wrongly sized if they didn't fit the whole viewport; I'm…
Cardioid3 Dec 17, 2020
52dff3e
Sync change to Kozea/CairoSVG
Cardioid3 Dec 29, 2020
5ebdd18
m
Cardioid3 Dec 29, 2020
6395329
Update .vertices for other shapes
Cardioid3 Jan 8, 2021
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14 changes: 14 additions & 0 deletions cairosvg/helpers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -153,6 +153,20 @@ def preserve_ratio(surface, node, width=None, height=None):
return scale_x, scale_y, translate_x, translate_y


def bezier_angles(*points):
"""Return the tangent angles of a Bezier curve of any degree."""
if len(points) < 2:
# zero-length segment
return (0, 0)
# Control points that coincide with vertices can be removed
elif points[0] == points[1]:
return bezier_angles(*points[1:])
elif points[-2] == points[-1]:
return bezier_angles(*points[:-1])
else:
return (point_angle(*points[0], *points[1]), point_angle(*points[-2], *points[-1]))


def clip_marker_box(surface, node, scale_x, scale_y):
"""Get the clip ``(x, y, width, height)`` of the marker box."""
width = size(surface, node.get('markerWidth', '3'), 'x')
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