Question

我遇到了海龟的问题。

这是到目前为止的代码：

'''
Levi Davis
This program demonstrates my knowledge on turtles based on problem one in the
third set of homework questions
'''

import turtle
import math

def draw_arc(t, angle, num_segments, length):
    '''
    draws an arc with turtle 't' that has a number of segments equal to 'num_segments'
    and a length equal to 'length' with a turn angle of 'angle' divided by 'num_segments'
    '''

    #this is my calculations on the actual turning of the turtle
    turn_angle = angle // num_segments
    init_turn = ((num_segments - 1) * turn_angle) // 2

    #the initial turn of the turtle and the loop to make the arc
    t.right(init_turn)
    for count in range(num_segments):
        t.forward(length/num_segments)
        t.left(turn_angle)

    #undoing the final turn and the initial turn
    t.right(turn_angle + init_turn)

def draw_squiggle(t, angle, num_segments, length, num_squiggles):
    '''
    This function utilizes draw_arc() to create a squiggly line
    '''
    for x in range(num_squiggles):
        draw_arc(t, angle, num_segments, length)
        draw_arc(t, -(angle), num_segments, length)

def draw_petal(t, angle, num_segments, length):
    '''
    draws a filled in petal shape using 2 arcs and a 180 degree turn
    '''
    t.begin_fill()
    draw_arc(t, angle, num_segments, length)
    t.left(180)
    draw_arc(t, angle, num_segments, length)
    t.left(180)
    t.end_fill()

def draw_leaf(t, angle, num_segments, length):
    draw_petal(t, angle, num_segments, length)
    t.fillcolor(t.pencolor())
    draw_petal(t, angle, num_segments, (length / 2))

wn = turtle.Screen()


bob = turtle.Turtle()
bob.pencolor("tomato2")
bob.pensize(5)
bob.fillcolor("black")


#Because clare told me to I made her into a turtle
clare = turtle.Turtle()
clarepen = "green"
clarefill = "purple"
clare.pencolor(clarepen)
clare.pensize(3)
clare.fillcolor(clarefill)

#testing of functions

   #draw_arc(bob, 100, 10, 10)
   #draw_arc(bob, -100, 10, 10)
   #draw_squiggle(bob, -100, 10, 10, 2)
   #draw_petal(clare, 100, 10, 40)
   #draw_leaf(clare, 100, 10, 40)

#that one shape that is kind of trippy to look at... I think?...
size = 80
def draw_weird_shape(t1, t2):
    startx = -size / 2
    starty = -size / 2 * math.tan(math.radians(144 /2))
    t1.up()
    t1.goto(startx, starty)
    t1.down()
    t2.up()
    t2.goto(startx, starty)
    t2.down()

    t1_fill = "purple"
    t1_pen = "green"

    for count in range(10):
        t1.forward(size/2)
        t1.right(90)
        draw_squiggle(t1, 50, 10, 20, 2)
        draw_leaf(t1, 50, 10, 50)
        t1.pencolor(t1_pen)
        t1.fillcolor(t1_fill)
        t1.right(180)
        draw_squiggle(t1, 50, 10, 20, 2)
        t1.right(90)
        t1.forward(size/2)
        t1.left(36)        
        t2.up()
        t2.forward(size)
        t2.left(18)
        t2.right(90)
        t2.down()
        draw_petal(t2, 50, 5, 25)
        t2.up()
        t2.left(108)

draw_weird_shape(clare, bob)

'''
clare.forward(20)
clare.left(18)
clare.right(90)
clare.forward(20)
clare.left(180)
clare.forward(20)
clare.right(90)
clare.forward(20)
'''

wn.exitonclick()

问题似乎在第100行附近。

当波浪线开始回归时，它不会像它应该的那样在180度转弯时返回。

Answer 1

当波浪线开始回归时，它不会回到180度程度转好了。

你的问题是这段代码：

#this is my calculations on the actual turning of the turtle
turn_angle = angle // num_segments
init_turn = ((num_segments - 1) * turn_angle) // 2

通过使用整数除法//，您引入了足够的错误，使得波浪线下面的弧形代码不会回溯相同的路径。而是使用浮点除法/，以使其更准确：

# this is my calculations on the actual turning of the turtle
turn_angle = angle / num_segments
init_turn = ((num_segments - 1) * turn_angle) / 2

海龟遇到麻烦

1 个答案: