Python tkinter库：简易画板（笔、直线、矩形、圆形和橡皮擦工具+导入、保存、撤销、清屏功能）

Tkinter

Tkinter是Python的一款功能强大且全面、操作简易的GUI编程模块。今天，我们将使用tkinter制作一款简易画图软件。加油吧！

最终效果如下：

 

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下载模块

我们将使用Python 3.10为编译器，使用 pip 下载所需模块：

pip install tkinter
pip install PIL

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导入模块

这里，我们将导入所有所需的模块。

import time
import tkinter
import tkinter.simpledialog
import tkinter.colorchooser
import tkinter.filedialog
from PIL import Image, ImageTk, ImageGrab

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设置主窗口

设置所有接下来所需的元素，并初始化。

def center_window(w, h):
    app.winfo_screenwidth()
    app.winfo_screenheight()
    app.geometry('%dx%d' % (w, h))

app = tkinter.Tk()
app.title('轩氏画图')
x = 1200
y = 800
center_window(x, y)

yesno = tkinter.IntVar(value=0)
what = tkinter.IntVar(value=1)
X = tkinter.IntVar(value=0)
Y = tkinter.IntVar(value=0)

foreColor = '#000000'
backColor = '#FFFFFF'

image = tkinter.PhotoImage()
canvas = tkinter.Canvas(app, bg='white', width=x, height=y)
canvas.create_image(x, y, image=image)

lastDraw = 0
end = [0]
size = "20"

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基本画图运算逻辑

重点来了！我们使用鼠标左键按下等动作探测，绘制曲线：

def getter(widget):
    time.sleep(0.5)
    x = app.winfo_x() + widget.winfo_x()
    y = app.winfo_y() + widget.winfo_y()
    if app.winfo_x() < 0:
        x = 0
    if app.winfo_y() < 0:
        y = 0
    x1 = x + widget.winfo_width() + 200
    y1 = y + widget.winfo_height() + 200
    filename = tkinter.filedialog.asksaveasfilename(filetypes=[('.jpg', 'JPG')],
                                                    initialdir='C:\\Users\\lin042\\Desktop\\')
    ImageGrab.grab().crop((x, y, x1, y1)).save(filename)

def onLeftButtonDown(event):
    yesno.set(1)
    X.set(event.x)
    Y.set(event.y)
    if what.get() == 4:
        canvas.create_text(event.x, event.y, font=("等线", int(size)), text=text, fill=foreColor)
        what.set(1)

def onLeftButtonMove(event):
    global lastDraw
    if yesno.get() == 0:
        return
    if what.get() == 1:

        lastDraw = canvas.create_line(X.get(), Y.get(), event.x, event.y,
                                      fill=foreColor)
        X.set(event.x)
        Y.set(event.y)
    elif what.get() == 2:
        try:
            canvas.delete(lastDraw)
        except Exception:
            pass

        lastDraw = canvas.create_line(X.get(), Y.get(), event.x, event.y,
                                      fill=foreCol