移动已经绘制的图像python乌龟 [英] Move already drawn image python turtle

问题描述

是否可以在视觉上移动已经绘制的图像?每次移动时都不必重新绘制它?所以，让方块完好无损并朝某个方向移动.

Is it possible to visually move an already drawn image? Without having to redraw it each time it's moved? So, show the square intact and moving in some direction.

from turtle import * 
def drawing():
    forward(50)
    left(90)
    forward(50)
    left(90)
    forward(50)
    left(90)
    forward(50)
drawing()
done()

推荐答案

turtle 没有移动所有元素的特殊功能.

turtle doesn't have special function to move all elements.

但是 turtle 使用 tkinter，它使用 Canvas 对象来显示元素.
Canvas 具有获取所有显示元素并移动它们的功能.

But turtle uses tkinter which uses Canvas object to display elements.
Canvas has function to get all displayed elements and move them.

turtle 可以访问画布(get_canvas())，但稍后您必须了解 tkinter 才能对画布和元素执行某些操作.

turtle gives access to canvas (get_canvas()) but later you have to know tkinter to do something with canvas and elements.

这个例子绘制元素然后它移动了(300, 50).
您也可以单击乌龟并拖动它来移动所有元素.

This example draw element and then it moves by (300, 50).
You can also click turtle and drag it to move all elements.

import turtle

t = turtle.Turtle()

# --- move all elements ---

def move(offset_x, offset_y):

    canvas = turtle.getcanvas() # `turtle`, not `t`
    for element_id in canvas.find_all():
        canvas.move(element_id, offset_x, offset_y)

# --- move all on draging turtle ---

old_x = 0
old_y = 0

# get mouse current position
def on_click(x, y):
    global old_x, old_y

    old_x = x
    old_y = y

# move elements
def on_drag(x, y):
    global old_x, old_y

    move(x-old_x, old_y-y)

    old_x = x
    old_y = y

t.onclick(on_click)
t.ondrag(on_drag)

# --- example ---

# draw something 

for a in range(8):
    for _ in range(8):
        t.left(45)
        t.fd(20)
    t.right(45)
    t.up()
    t.fd(60)
    t.down()

# move

move(300, 50)

# ---

turtle.done() # `turtle`, not `t`

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