学习笔记(04):Python 面试100讲（基于Python3.x）-绘制谢尔宾斯基三角形

立即学习:https://edu.csdn.net/course/play/26755/340208?utm_source=blogtoedu

代码为

import turtle
#绘制三角形，左边为[[x1,y1], [x2,y2], [x3,y3]]
def draw_triangle(points, color, t):
    d.fillcolor(color)
    t.up()
    #将画笔移动到第一个点
    t.goto(points[0][0], points[0][1])
    t.down()
    t.begin_fill()#填充颜色
    t.goto(points[1][0], points[1][1])#绘制了3条边
    t.goto(points[2][0], points[2][1])
    t.goto(points[0][0], points[0][1])
    t.end_fill()
#求中位点
def mid_point(p1,p2):
    return [(p1[0] + p2[0])/2, (p1[1] + p2[1])/2]
def sierpinski(points, degree, t):
    colormap = ['blue', 'red', 'green', 'yellow', 'violet', 'orange']
    #绘制大的三角形
    draw_triangle(points, colormap[degree - 1], t)
    if degree >= 0:
        #绘制左下角三角形
        sierpinski([points[0], mid_point(points[0],points[1]), mid_point(points[0],points[2])], degree-1, t)
        #绘制右下角三角形
        sierpinski([points[1], mid_point(points[0],points[1]), mid_point(points[1],points[2])], degree-1, t)
        #绘制上三角形
        sierpinski([points[2], mid_point(points[0],points[2]), mid_point(points[1],points[2])], degree-1, t)
    
t = turtle.Turtle()
win = turtle.Screen()
points = [[-200,-100], [0,200], [200,-100]]
sierpinski(points, 4, t)
win.exitonclick()

结果为