makemaps.py 文件源码

def getMapLines(dmin, dmax, nlines):
    drange = dmax-dmin
    if drange > 4:
        near = 1
    else:
        if drange >= 0.5:
            near = 0.25
        else:
            near = 0.125
    inc = roundToNearest(drange/nlines, near)
    if inc == 0:
        # make the increment the closest power of 10
        near = np.power(10, round(math.log10(drange)))
        inc = ceilToNearest(drange/nlines, near)
        newdmin = floorToNearest(dmin, near)
        newdmax = ceilToNearest(dmax, near)
    else:
        newdmin = ceilToNearest(dmin, near)
        newdmax = floorToNearest(dmax, near)
    darray = np.arange(newdmin, newdmax+inc, inc)
    if darray[-1] > dmax:
        darray = darray[0:-1]
    return darray