maplib.py 文件源码

def neighbor_circle(location, pos, shift=False, factor=1.0):
    pos = pos % 6
    latrad = location[0] * pi / 180
    x_un = factor * safety / earth_Rrect / cos(latrad) * 180 / pi
    y_un = factor * safety / earth_Rrect * 180 / pi
    if not shift:
        y_un = y_un * (3.0 ** 0.5) / 2.0 * HEX_R
        x_un = x_un * HEX_R * 1.5
        yvals = [-2, -1, 1, 2, 1, -1]
        xvals = [0, 1, 1, 0, -1, -1]
    else:
        y_un = y_un * HEX_R * 1.5
        x_un = x_un * (3.0 ** 0.5) / 2.0 * HEX_R
        yvals = [-1, 0, 1, 1, 0, -1]
        xvals = [1, 2, 1, -1, -2, -1]

    newlat = location[0] + y_un * yvals[pos]
    newlng = ((location[1] + x_un * xvals[pos] + 180) % 360) - 180
    return (newlat, newlng)