Question

我试图用python在python中绘制美国国旗，最后迷失在我的代码中而没有找到我的错误。我也无法弄清楚如何为我的旗帜着色......我认为可行的是不是......我做了一些事情，现在我的代码崩溃了一半......请帮助我我是编程新手......

到目前为止，这是我的代码。

canvas

Answer 1

我相信你拥有所有关键组件。您主要需要考虑相对于大小和起始位置，而不是硬编码值，并保持简单。（例如color("blue")而不是color(r, s, t)，直到你开始工作。）并仔细看看旗帜上的星星安排。

我按照上述评论的方式重新编写了代码并进行了一些样式更改：

import turtle

X_POSITION, Y_POSITION = -150, 150

def draw_rectangle(length, height):
    turtle.up()

    C = height * (7 / 13.0)
    D = length * (2 / 5.0)
    L = height * (1 / 13.0)

    ## Draw rectangle first.

    turtle.setpos(X_POSITION, Y_POSITION)

    turtle.down()

    turtle.forward(length)
    turtle.right(90)
    turtle.forward(height)
    turtle.right(90)
    turtle.forward(length)
    turtle.right(90)
    turtle.forward(height)

    ## Then draw the red stripes.

    x, y = X_POSITION, Y_POSITION - L

    turtle.color("red")

    for z in range(0, 13, 2):
        turtle.up()

        turtle.setpos(x, y)
        turtle.setheading(90)

        turtle.down()

        turtle.begin_fill()
        turtle.forward(L)
        turtle.right(90)
        turtle.forward(length)
        turtle.right(90)
        turtle.forward(L)
        turtle.right(90)
        turtle.forward(length)
        turtle.end_fill()

        y -= 2 * L

    ## Draw the stars rectangle overlapping the stripes

    turtle.up()

    turtle.color('blue')
    turtle.setpos(X_POSITION + D, Y_POSITION - C)

    turtle.down()

    turtle.begin_fill()
    turtle.forward(D)
    turtle.right(90)
    turtle.forward(C)
    turtle.right(90)
    turtle.forward(D)
    turtle.right(90)
    turtle.forward(C)
    turtle.end_fill()

    ## next is stars

    turtle.up()

    draw_stars(D, C)

    turtle.up()

    ## This gets the turtle pen out of the way at the very end.
    turtle.hideturtle()

def draw_stars(length, height):
    row = height // 9
    row_offset = row / 2.0
    column = length // 6
    column_offset = column / 2.0

    y_position = row_offset

    for z in range(9):
        if z % 2 == 0:
            draw_starrows(6, column_offset, y_position, column)
        else:
            draw_starrows(5, column, y_position, column)

        y_position += row

def draw_starrows(star_count, x_offset, y_offset, spacing):
    x, y = X_POSITION, Y_POSITION

    turtle.color("white")

    for z in range(star_count):
        turtle.up()

        turtle.setpos(x + x_offset, y - y_offset)
        turtle.begin_fill()

        turtle.down()

        for _ in range(5):
            turtle.forward(6.154)
            turtle.left(144)

        turtle.end_fill()

        x += spacing

def draw_flag(height):
    turtle.speed("fastest")
    draw_rectangle(height * 1.9, height)

draw_flag(200)

turtle.done()

虽然缩放现在基本上有效（尝试draw_flag(100)）但是星星本身（你做得很好，BTW）仍然是固定大小的，所以你需要回去并缩放它们以匹配其余的国旗：

我的错误/故障在哪里？

1 个答案: