在Python中如何将20只海龟放在一个圆圈上?
我必须把20只海龟放在一个有20条边的多边形的垂直线上,这样它们就会在一个有规则间距的圆上 我有一个海龟班,我想把那20只海龟放在哪里。我知道如何把更多的海龟排成一排,但我怎么能把它们排成一个圈呢在Python中如何将20只海龟放在一个圆圈上?,python,turtle-graphics,Python,Turtle Graphics,我必须把20只海龟放在一个有20条边的多边形的垂直线上,这样它们就会在一个有规则间距的圆上 我有一个海龟班,我想把那20只海龟放在哪里。我知道如何把更多的海龟排成一排,但我怎么能把它们排成一个圈呢 # Already working class Turtle: def __init__(self, x, y): self.x = x self.y = y self.heading = 0 self.lines = []
# Already working
class Turtle:
def __init__(self, x, y):
self.x = x
self.y = y
self.heading = 0
self.lines = []
def left(self, angle):
self.heading -= angle
def right(self, angle):
self.heading += angle
def forward(self, d):
nx = self.x + d * math.cos(self.heading * math.pi / 180)
ny = self.y + d * math.sin(self.heading * math.pi / 180)
self.lines.append((self.x, self.y, nx, ny))
self.x, self.y = nx, ny
def save(filename, lines):
f = open(filename, "w")
f.write('<svg viewBox="-500 -500 1000 1000">')
s = '<line x1="{}" y1="{}" x2="{}" y2="{}" style="{}" />'
for i in lines:
for x1, y1, x2, y2 in i:
f.write(s.format(x1, y1, x2, y2, "stroke:black;stroke-width:1"))
f.write("</svg>")
f.close()
# Here is just a try to put more turtles with more lines in one file
# But I can't do this with 20 turtles...
def set_turtles():
global all_lines
turtle_names = []
t_red = Turtle(-100, 0)
turtle_names.append(t_red)
t1 = Turtle(0, 100)
turtle_names.append(t1)
t2 = Turtle(0, -100)
turtle_names.append(t2)
for turtle in turtle_names:
for i in range(4):
turtle.forward(10)
turtle.left(90)
all_lines.append(turtle.lines)
save("drawing_one.html", all_lines)
f.close()
让我们使用Python的turtle类来帮助解决这个问题,而不是使用定制的turtle类来完成所有工作。我们仍然需要我们自己的自定义turtle类(不称为turtle),它可以记录调用foward时生成的行。另外,实现一个静态方法,将所有自定义Turtle绘制的所有线条转储到SVG文件中。但是我们可以简单地继承所有其他方法 通过这种方法,我们不需要三角学来记录线条,而是在调用super.forward之前记录海龟的位置。。。然后记录海龟的位置 最后,我们不需要跟踪自定义turtles,而是使用Screen.turtles并过滤掉那些不是自定义类实例的类
from turtle import Screen, Turtle
RADIUS = 100
class SVG_Turtle(Turtle):
TEMPLATE = '<line x1="{}" y1="{}" x2="{}" y2="{}" style="{}" />'
STYLE = 'stroke:black;stroke-width:1'
HEADER = '<svg viewBox="-500 -500 1000 1000">'
FOOTER = '</svg>'
def __init__(self, position):
super().__init__(visible=False)
self.lines = []
self.penup()
self.goto(position)
def forward(self, distance):
position = self.position()
super().forward(distance)
self.lines.append((position, self.position()))
@staticmethod
def save(filename):
with open(filename, 'w') as file:
file.write(SVG_Turtle.HEADER)
for turtle in screen.turtles():
if not isinstance(turtle, SVG_Turtle):
continue
for ((x1, y1), (x2, y2)) in turtle.lines:
file.write(SVG_Turtle.TEMPLATE.format(x1, y1, x2, y2, SVG_Turtle.STYLE))
file.write(SVG_Turtle.FOOTER)
screen = Screen()
yertle = Turtle(visible=False) # standard Python turtle to lay down our custom ones
yertle.penup()
yertle.sety(-RADIUS)
screen.tracer(False)
for _ in range(20):
turtle = SVG_Turtle(yertle.position())
turtle.setheading(turtle.towards(0, 0)) # Optional visual detail I added
yertle.circle(RADIUS, 360 / 20, 20)
for turtle in screen.turtles():
if isinstance(turtle, SVG_Turtle):
for _ in range(4):
turtle.forward(10)
turtle.left(90)
screen.tracer(True)
SVG_Turtle.save("drawing.html")
即使不允许您使用Python的turtle来帮助解决自己的turtle问题,这也会给您一些如何继续以及如何组织代码的想法。当问题已经累积了答案时,不要删除它们。这不是网站的工作方式。