td.py 文件源码

def __ComputeCurved(vpercent, w, vec, via, pts, segs):
    """Compute the curves part points"""

    radius = via[1]/2.0

    # Compute the bezier middle points
    req_angle = asin(vpercent/100.0)
    oppside = tan(req_angle)*(radius-(w/sin(req_angle)))
    length = sqrt(radius*radius + oppside*oppside)
    d = req_angle - acos(radius/length)
    vecBC = [vec[0]*cos(d)+vec[1]*sin(d), -vec[0]*sin(d)+vec[1]*cos(d)]
    pointBC = via[0] + wxPoint(int(vecBC[0] * length), int(vecBC[1] * length))
    d = -d
    vecAE = [vec[0]*cos(d)+vec[1]*sin(d), -vec[0]*sin(d)+vec[1]*cos(d)]
    pointAE = via[0] + wxPoint(int(vecAE[0] * length), int(vecAE[1] * length))

    curve1 = __Bezier(pts[1], pointBC, pts[2], n=segs)
    curve2 = __Bezier(pts[4], pointAE, pts[0], n=segs)

    return curve1 + [pts[3]] + curve2