获取tkinter画布上的像素值(为了bloodfill漫水填充而准备的程序)
from tkinter import *
from PIL import Image
import numpy as np
def get_pixel_color(canvas, x, y):
"""获取tkinter画布上一点的像素值,原理是寻找最上层item,但是如果item表示的是文字
则返回的并不代表文字区域都是那个fill颜色,因为文字并不是实心的,所以此程序局限性较大,
也不适合于有图像的.仅做参考,供给有需要的人士阅读"""
ids = canvas.find_overlapping(x, y, x, y)
if len(ids) > 0: # 说明画布上有item,取最上面的item
item = ids[-1]
color = canvas.itemcget(item,"fill") # 获取这个item的fill填充颜色
color = color.upper()
if color != '':r,g,b = canvas.winfo_rgb(color)
else: # 否则画布上这个位置没有item,则取背景色
r,g,b = canvas.winfo_rgb(canvas.config('bg')[-1])
r,g,b = r>>8,g>>8,b>>8
return r,g,b
def get_pixels_of(canvas):
width = int(canvas["width"])
height = int(canvas["height"])
colors = []
for y in range(height):
row = []
for x in range(width):
row.append(get_pixel_color(canvas, x, y))
colors.append(row)
return colors
root = Tk()
cv = Canvas(width=48,height=36,bg='cyan')
cv.pack()
画布背景色 = cv.winfo_rgb(cv.config('bg')[-1])
r,g,b = 画布背景色
r,g,b = r>>8,g>>8,b>>8
print(r,g,b)
cv.create_text(22,22,text='我',fill='red')
cv.create_oval((5,5,20,16),fill='red',outline='red')
ps = get_pixels_of(cv)
# 把ps中的每个点写入图像
#im = Image.new("RGBA",(480,360))
ps = np.array(ps)
print(ps)
im = Image.fromarray(np.uint8(ps))
im.show()
