canvas中的控件

canvas中所有控件定义生成好后，后加pack/grid/place，加以显示。
用tkinter.pack设计复杂界面布局

生成canvas

    def showCanvas(self):            #显示画布
        self.canvas_1 = tkinter.Canvas(width=500,height=50,bg="red")
        self.canvas_1.pack(side='top',expand='no',fill='x')

        self.canvas_2 = tkinter.Canvas(width=100,height=100,bg='yellow')
        self.canvas_2.pack(side='left',anchor='nw',fill='y')

        self.canvas_3 = tkinter.Canvas(bg='white')
        self.canvas_3.pack(side='left',expand='yes',fill='both',padx=5,pady=5)

button

生成对象 = tkinter.Button（画布,长,宽,command,image）
command和bind用来绑定控件的功能函数

#####文件的路径#########
C_PATH = "F:\\py_pro\\electricBox\\venv\\log\\CC.png"
R_PATH = "F:\\py_pro\\electricBox\\venv\\log\\RR.png"
L_PATH = "F:\\py_pro\\electricBox\\venv\\log\\LL.png"

    def addButton(self):
        photo_C = tkinter.PhotoImage(file=C_PATH)
        self.button_show_R = tkinter.Button(self.canvas,width=100,height=50,image=photo_C).pack(side='top')
        photo_R = tkinter.PhotoImage(file=R_PATH)
        self.button_show_R = tkinter.Button(self.canvas,width=100,height=50,image=photo_R).pack(side='top')
        photo_L = tkinter.PhotoImage(file=L_PATH)
        self.button_show_R = tkinter.Button(self.canvas,width=100,height=50,image=photo_L).pack(side='top')

控件Button和其他控件都可以插入图片

Label

    def addLabel(self):
        self.Label1 = tkinter.Label(self.canvas_1,width=50,foreground='blue',text='Input information：')
        self.Label1.pack(side='left')

Entry

简单的文本框输入，以“回车”触发

    def getEntry(self):
        self.input_var = tkinter.StringVar()
        self.inputEntry = tkinter.Entry(self.canvas,textvariable=self.input_var)
        self.inputEntry.bind('<Return>',self.Analysis_Creat)
        self.inputEntry.pack(side='left')

combox

下拉框默认可以在框里输入信息，将state设为“readonly”，即没有输入信息的功能

    def combox(self):
        self.comboxText = tkinter.StringVar()
        self.combox = tkinter.ttk.Combobox(self.canvas,width=10,textvariable=self.comboxText,state='readonly')
        self.combox['value'] = ('电阻','电容','电感','短路','断路')
        self.combox.pack(side= 'left')

画布中画直线

在画布中，用鼠标画直线，

    ##################   Start  canvas中画线    ############################
    def paintLine(self):
        self.canvas.bind('<Button-1>',self.getStartPosition)
        self.canvas.bind('<ButtonRelease-1>', self.getEndPosition)
    def getStartPosition(self,event):
        self.x_Start_position = event.x
        self.y_Start_position = event.y
        print(self.x_Start_position,self.y_Start_position)
    def getEndPosition(self,event):
        self.x_End_position = event.x
        self.y_End_position = event.y
        print(self.x_End_position, self.y_End_position)
        if  abs(self.x_End_position - self.x_Start_position) >  abs(self.y_End_position - self.y_Start_position):
            self.line1 = self.canvas.create_line(self.x_Start_position,self.y_Start_position,
                                           self.x_End_position,self.y_Start_position)
        else:
            self.line1 = self.canvas.create_line(self.x_Start_position,self.y_Start_position,
                                           self.x_Start_position,self.y_End_position)

标签：控件,canvas,tkinter,self,Start,position,中画,pack
来源： https://blog.csdn.net/qq_40839071/article/details/106538146