用图像填充 Tkinter 画布元素 [英] Filling a Tkinter Canvas Element with an Image

问题描述

有什么方法可以用图像填充 Tkinter 元素(更具体地说是椭圆形).如果没有，有没有办法调整图像大小以适应椭圆形?我也不想使用 PIL.

Is there any way to fill a Tkinter element (more specifically an oval) with an image. If not, is there any way to resize an image to fit into an oval? I also would prefer not to use PIL.

canvas.create_oval(val1, val2, val1+sz, val2+sz, fill=clr, outline=outln)

如何使图像适合这样的圆圈?
如果您想知道，我当然也会剔除图像周围的边缘.

How would you get an image to fit inside a circle like so?
I would also certainly cull the edges around the image if you were wondering.

推荐答案

在普通的 Tkinter 中，您的选择是有限的.您可以做的一件事是创建一个中间有一个透明圆圈的面具"图像.然后降低你的自己的形象在背后.(虽然效率不高)

In plain Tkinter your options are limited. One thing you could do is create a 'mask' image that has a transparent circle in the middle. Then lower your own image in behind it. (not very efficient though)

from tkinter import *

root = Tk()
canvas = Canvas(root, width=200, height=200, bd=0,
                highlightthickness=0)
canvas.pack()

mask = PhotoImage(width=200, height=200)
cx,cy = 100,100 # image & circle center point
r = 100         # circle radius
r_squared = r*r
for y in range(200):
    for x in range(200):
        # using the formula for a circle:
        # (x - h)^2 + (y - k)^2 = r^2
        # any pixel outside our circle gets filled
        if (x - cx)**2 + (y - cy)**2 > r_squared:
            mask.put('blue', (x,y))

canvas.create_image(100,100, image=mask, anchor='c')

myimage = PhotoImage(file='bigpython.gif')
item = canvas.create_image(100,100, image=myimage, anchor='c')
canvas.lower(item)

root.mainloop()

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