如何在python中使用鼠标拖动打印在图像(画布上)上的文本?

时间:2019-02-26 13:59:54

标签: python tkinter python-imaging-library mouse draggable

我想在画布中添加拖动文本功能,以使用鼠标更改文本的位置。

from PIL import Image,ImageFont,ImageDraw,ImageTk
import tkinter as tk

root = tk.Tk()
root.title('Demo')
root.geometry('400x50')

def func_image():

    img_window = tk.Toplevel()
    img_window.grab_set()

    photo = Image.open(r'E:\side_300.png')
    wi,hi = photo.size
    fonty = ImageFont.truetype('arial.ttf',18)
    draw = ImageDraw.Draw(photo)
    draw.text((50,50),text=text.get(),fill='red',font=fonty)
    new_photo = photo
    can_photo = ImageTk.PhotoImage(new_photo)

    canvas = tk.Canvas(img_window,height=500,width=500)
    canvas.pack(anchor='n')
    canvas.create_image(wi/2,hi/2,image=can_photo,anchor='center')
    img_window.mainloop()

lbl_text = tk.Label(root,text='Enter Text :')
lbl_text.grid(row=0,column=0)

text = tk.Entry()
text.grid(row=0,column=1)

btn = tk.Button(root,text='Click Me',command=func_image)
btn.grid(row=0,column=2)

root.mainloop()

运行代码时,它将首先打开一个名为“ Demo”的窗口,其中包含一个输入框和一个按钮。
当在输入框中输入一些文本后单击“单击我”按钮时,它将进入功能 func_image ,并打开一个新窗口,其中包含一个填充有new_image的画布。

1 个答案:

答案 0 :(得分:1)

快速免责声明:我在PIL方面没有太多经验,所以我不知道如何删除已经绘制的文本。也许您可以自己找出一个。但除此之外,我对tkinter有所了解。我的想法如下:

<B1-motion>事件绑定一个函数(按住并移动按钮1),该函数将不断获取鼠标在窗口内的位置并在该位置绘制新文本,同时删除先前的文本。

    import...
    ...

    def func_image():
        img_window = tk.Toplevel()
        ...
        ...
        draw = ImageDraw.Draw(photo)
        draw.text((50,50),text=text.get(),fill='red',font=fonty)
        ...
        def move_text(event):
            # here you would delete your previous text
            x = event.x
            y = event.y
            draw.text((x,y),text=text.get(),fill='red',font=fonty

        img_window.bind('<B1-Motion>', move_text)

话虽这么说,我认为使用Canvas.create_text(在effbot.org中有更多信息)以便在图像上书写文字会是一个更好的主意。在Canvas上拖动文本真的很容易,这是一个小例子:

import tkinter as tk

root = tk.Tk()

def change_position(event):
    x = event.x
    y = event.y

    # 20x20 square around mouse to make sure text only gets targeted if the mouse is near it
    if text in c.find_overlapping(str(x-10), str(y-10), str(x+10), str(y+10)):
        c.coords(text, x, y)  # move text to mouse position

c = tk.Canvas(root)
c.pack(anchor='n')

text = c.create_text('10', '10', text='test', fill='red', font=('arial', 18))  # you can define all kinds of text options here
c.bind("<B1-Motion>", change_position)

root.mainloop()