Python龟背透明填充？

Question

我正在尝试使用 Turtle 库重新创建此图片：

但我在尝试制作内圈时遇到了困难 'transparent'。我搜索了文档，但找不到更改圆圈填充颜色的不透明度的方法。

我试过的是：

colors = ["black", "magenta", "pink", "blue", "green", "yellow", "orange", "red", "white"]

for i in range(8):
    my_turtle.fillcolor(colors[i])
    my_turtle.begin_fill()
    my_turtle.circle(150)
    my_turtle.end_fill()
    my_turtle.fillcolor("white")
    my_turtle.begin_fill()
    my_turtle.circle(130)
    my_turtle.end_fill()
    my_turtle.fillcolor(colors[i])
    my_turtle.begin_fill()
    my_turtle.circle(100)
    my_turtle.end_fill()
    my_turtle.fillcolor("white")
    my_turtle.begin_fill()
    my_turtle.circle(80)
    my_turtle.end_fill()
    my_turtle.rt(45)

但我得到的是：

有什么想法吗？

Answer 1

您可以反转圆圈颜色的每个较小的圆圈：

colors = ["black", "magenta", "pink", "blue", "green", "yellow", "orange", "red", "white"]

for i in range(8):
    my_turtle.fillcolor(colors[i])
    my_turtle.begin_fill()
    my_turtle.circle(150)
    my_turtle.circle(130, -360)
    my_turtle.end_fill()
    my_turtle.fillcolor(colors[i])
    my_turtle.begin_fill()
    my_turtle.circle(100)
    my_turtle.circle(80, -360)
    my_turtle.end_fill()
    my_turtle.rt(45)

输出：

Answer 2

您可能不需要像@AnnZen 建议的那样添加负号，而是注释字符。您的代码（删除了以下行）对我来说工作正常：

for i in range(8):
    my_turtle.fillcolor(colors[i])
    my_turtle.begin_fill()
    my_turtle.circle(150)
    # my_turtle.end_fill()
    # my_turtle.fillcolor("white")
    # my_turtle.begin_fill()
    my_turtle.circle(130)
    my_turtle.end_fill()
    # my_turtle.fillcolor(colors[i])
    my_turtle.begin_fill()
    my_turtle.circle(100)
    # my_turtle.end_fill()
    # my_turtle.fillcolor("white")
    # my_turtle.begin_fill()
    my_turtle.circle(80)
    my_turtle.end_fill()
    my_turtle.rt(45)

完整的解决方案：

from turtle import Screen, Turtle

COLORS = ['black', 'magenta', 'pink', 'blue', 'green', 'yellow', 'orange', 'red']

screen = Screen()
screen.tracer(False)

turtle = Turtle()
turtle.width(6)

for color in COLORS:
    turtle.fillcolor(color)

    turtle.begin_fill()
    turtle.circle(145)
    turtle.circle(130)
    turtle.end_fill()

    turtle.begin_fill()
    turtle.circle(115)
    turtle.circle(100)
    turtle.end_fill()

    turtle.right(45)

turtle.hideturtle()

screen.tracer(True)
screen.exitonclick()

The negative signs in Ann Zen's solution make each ring a polygon that touches itself at one point, but never overlaps itself. Your solution produces self-overlapping polygons, which have different results based on the polygon fill rule being used ("even-odd" vs. "nonzero winding number").

是的，我们以前见过这种情况，通常是填充的五角星。让我们进一步推动@AnnZen 的负范围解决方案，在填充之前绘制整个双弧：

from turtle import Screen, Turtle

COLORS = ['black', 'magenta', 'pink', 'blue', 'green', 'yellow', 'orange', 'red']

screen = Screen()

turtle = Turtle()
turtle.width(6)

for color in COLORS:
    turtle.fillcolor(color)

    turtle.begin_fill()
    turtle.circle(145)
    turtle.circle(130, -360)
    turtle.circle(115)
    turtle.circle(100, -360)
    turtle.end_fill()

    turtle.right(45)

turtle.hideturtle()

screen.exitonclick()

这在绕组数方面表现良好吗？

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