calculate the start and end angles of an SVG path arc command

hbghlyj

计算svg path 中的A (elliptical arc command)(此处假定是圆弧, 即 rx=ry)的start angle,end angle以导入TikZ

1. import math
2. # SVG path string
3. path = 'M 11.71,194.229 A 103.5,103.5 0 0 0 109.185,20.817'
4. # Split the path string to get the start and end points of the arc
5. _,start_point,_, radius, _, _, _, end_point = path.split()
6. radius = float(radius.split(",")[0])
7. # Convert the start and end points to floats
8. start_x, start_y = map(float, start_point.split(","))
9. end_x, end_y = map(float, end_point.split(","))
10. # Calculate the start angle using the atan2 function
11. start_angle = math.degrees(math.atan2(start_y - radius, start_x))
12. # Calculate the end angle using the atan2 function
13. end_angle = math.degrees(math.atan2(end_y - radius, end_x))
14. print(r"\draw(",start_point,")arc(",start_angle,":",end_angle,":",radius,");")

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This will output:

\draw( 11.71,194.229 )arc( 82.64573712265114 : -37.13571293426289 : 103.5 );

See 14.7The Arc Operation

hbghlyj

1#错的. 没有考虑sweep-flag largeArcFlag