eteach/paint.py at main · mibino/eteach · GitHub

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from tkinter import *
from tkinter import messagebox
from tkinter.colorchooser import askcolor

win_width = 800
win_height = 650
bgcolor = '#ffffff'


class Paint(Frame):
	"""一个经典的GUI写法"""

	def __init__(self, master=None):
		"""初始化方法"""
		super().__init__(master)  # 调用父类的初始化方法
		self.x = 0
		self.y = 0
		self.fgcolor = 'black'
		self.lastdraw = 0
		self.start_flag = False
		self.master = master
		self.pack()
		self.createWidget()

	def createWidget(self):
		"""创建画图区域"""
		self.drawpad = Canvas(self, width=win_width, height=win_height, bg=bgcolor)
		self.drawpad.pack()
		# 创建按钮
		self.btn_start = Button(self, name='start', text='开始')
		self.btn_start.pack(side='left', padx=10)
		self.btn_pen = Button(self, name='pen', text='画笔')
		self.btn_pen.pack(side='left', padx=10)
		self.btn_rect = Button(self, name='rect', text='矩形')
		self.btn_rect.pack(side='left', padx=10)
		self.btn_clear = Button(self, name='clear', text='清屏')
		self.btn_clear.pack(side='left', padx=10)
		self.btn_erasor = Button(self, name='erasor', text='橡皮擦')
		self.btn_erasor.pack(side='left', padx=10)
		self.btn_line = Button(self, name='line', text='直线')
		self.btn_line.pack(side='left', padx=10)
		self.btn_line_arrow = Button(self, name='line_arrow', text='箭头直线')
		self.btn_line_arrow.pack(side='left', padx=10)
		self.btn_color = Button(self, name='color', text='颜色')
		self.btn_color.pack(side='left', padx=10)
		self.btn_quit = Button(self, name='quit', text='退出')
		self.btn_quit.pack(side='left', padx=10)
		# 绑定事件
		self.btn_line.bind('<Button-1>', self.eventManager)  # 点击按钮事件
		self.btn_line_arrow.bind('<Button-1>', self.eventManager)  # 点击按钮事件
		self.btn_rect.bind('<Button-1>', self.eventManager)  # 点击按钮事件
		self.btn_pen.bind('<Button-1>', self.eventManager)  # 点击按钮事件
		self.btn_erasor.bind('<Button-1>', self.eventManager)  # 点击按钮事件
		self.btn_clear.bind('<Button-1>', self.eventManager)  # 点击按钮事件
		self.btn_color.bind('<Button-1>', self.eventManager)  # 点击按钮事件
		self.btn_quit.bind('<Button-1>', self.eventManager)  # 点击按钮事件
		self.master.bind('<KeyPress-r>', self.hotKey)  # 绑定快捷键
		self.master.bind('<KeyPress-g>', self.hotKey)  # 绑定快捷键
		self.master.bind('<KeyPress-b>', self.hotKey)  # 绑定快捷键
		self.master.bind('<KeyPress-y>', self.hotKey)  # 绑定快捷键
		self.master.bind('<KeyPress-q>', self.hotKey)  # 绑定快捷键
		self.drawpad.bind('<ButtonRelease-1>', self.stopDraw)  # 左键释放按钮

	def eventManager(self, event):
		name = event.widget.winfo_name()
		print(name)
		self.start_flag = True
		if name == 'line':
			# 左键拖动
			self.drawpad.bind('<B1-Motion>', self.myline)
		elif name == 'line_arrow':
			self.drawpad.bind('<B1-Motion>', self.myline_arrow)
		elif name == 'rect':
			self.drawpad.bind('<B1-Motion>', self.myrect)
		elif name == 'pen':
			self.drawpad.bind('<B1-Motion>', self.mypen)
		elif name == 'erasor':
			self.drawpad.bind('<B1-Motion>', self.myerasor)
		elif name == 'clear':
			self.drawpad.delete('all')
		elif name == 'color':
			c = askcolor(color=self.fgcolor, title='请选择颜色')
			print(c)  # c的值 ((128.5, 255.99609375, 0.0), '#80ff00')
			self.fgcolor = c[1]
		elif name == 'quit':
			quit()

	def startDraw(self, event):
		self.drawpad.delete(self.lastdraw)
		if self.start_flag:
			self.start_flag = False
			self.x = event.x
			self.y = event.y

	def stopDraw(self, event):
		self.start_flag = True
		self.lastdraw = 0

	def myline(self, event):
		self.startDraw(event)
		self.lastdraw = self.drawpad.create_line(self.x, self.y, event.x, event.y, fill=self.fgcolor)

	def myline_arrow(self, event):
		self.startDraw(event)
		self.lastdraw = self.drawpad.create_line(self.x, self.y, event.x, event.y, arrow=LAST, fill=self.fgcolor)

	def myrect(self, event):
		self.startDraw(event)
		self.lastdraw = self.drawpad.create_rectangle(self.x, self.y, event.x, event.y, outline=self.fgcolor)

	def mypen(self, event):
		self.startDraw(event)
		print('self.x=', self.x, ',self.y=', self.y)
		self.drawpad.create_line(self.x, self.y, event.x, event.y, fill=self.fgcolor)
		self.x = event.x
		self.y = event.y

	def myerasor(self, event):
		self.startDraw(event)
		print('self.x=', self.x, ',self.y=', self.y)
		self.drawpad.create_line(self.x, self.y, event.x, event.y, fill='white')
		self.x = event.x
		self.y = event.y

	def hotKey(self, event):
		c = event.char
		if c == 'r':
			self.fgcolor = 'red'
		elif c == 'g':
			self.fgcolor = 'green'
		elif c == 'b':
			self.fgcolor = 'blue'
		elif c == 'y':
			self.fgcolor = 'yellow'