tclock.py 文件源码

def dline(pair, from_x, from_y, x2, y2, ch):
    if curses.has_colors():
        stdscr.attrset(curses.color_pair(pair))

    dx = x2 - from_x
    dy = y2 - from_y

    ax = abs(dx * 2)
    ay = abs(dy * 2)

    sx = sign(dx)
    sy = sign(dy)

    x = from_x
    y = from_y

    if ax > ay:
        d = ay - ax // 2

        while True:
            plot(x, y, ch)
            if x == x2:
                return

            if d >= 0:
                y += sy
                d -= ax
            x += sx
            d += ay
    else:
        d = ax - ay // 2

        while True:
            plot(x, y, ch)
            if y == y2:
                return

            if d >= 0:
                x += sx
                d -= ay
            y += sy
            d += ax