The tkinter of Python development to realize the method of moving the graph with mouse

In this paper, the Tkinter of Python development is introduced to realize the method of moving the graph with mouse. Share to everyone for your reference, as follows:

When you do this, the inspiration comes from a JS effect:

Two eyes move with mouse movement

Operating effect:

Code section:

From tkinter Import * #1. Gets the current center coordinate of the small circle (x1, y1) #2. Gets the center coordinate (x2, y2) #3 to the small circle movement. Move the small circle from coordinates (x1, y1) to coordinates (x2, y2) __author__ = {' Name ': '       Hongten ', ' Mail ': ' hongtenzone@foxmail.com ', ' blog ': ' http://blog.csdn.net/', ' QQ ': ' 648719819 ', ' Created ': ' 2013-09-20 '}class Eay (Frame): def createwidgets (self): # # The playing field Self.draw = Canvas (self, width=500, height=500) #鼠标位置 self.mouse_x = self.mouse_y = #圆心坐标 (x, y) self.oval_zero_x = sel F.oval_zero_y = #外面大圆半径 Self.oval_r = #里面小圆半径 Self.oval_r = SELF.OVAL_R1 = Self.oval_r-self.ov Al_r + 0.5 self.oval_r2 = self.oval_r-self.oval_r-0.5 #小圆 self.letter_ball_x1 = Self.letter_ball_y1 = The ball is outside the great circle Self.ball = Self.draw.create_oval ((self.oval_zero_x-self.oval_r), (Self.ov Al_zero_y-self.oval_r), (self.oval_zero_x + Self.oval_r), (self.oval_zero_y + SE              Lf.oval_r),       Fill= "White") Self.ball = Self.draw.create_oval ((SELF.OVAL_ZERO_X-SELF.OVAL_R1), (Self.ova L_ZERO_Y-SELF.OVAL_R1), (self.oval_zero_x + self.oval_r1), (self.oval_zero_y + S                     ELF.OVAL_R1), fill= "Blue") Self.ball = Self.draw.create_oval ((SELF.OVAL_ZERO_X-SELF.OVAL_R2),                     (SELF.OVAL_ZERO_Y-SELF.OVAL_R2), (self.oval_zero_x + self.oval_r2), (Self.oval_zero_y + self.oval_r2), fill= "white") #里面小圆 Self.ball_over = Self.draw.create_ov Al ((Self.oval_zero_x-self.oval_r), (Self.oval_zero_y-self.oval_r), (self    . oval_zero_x + Self.oval_r), (self.oval_zero_y + self.oval_r), fill= "Red") Self.draw.pack (Side=left) def mouseMove (Self, event): self.mouse_x = event.x self.mouse_y = Event.y if Show_lo G:print (' # ' * 50)     Print (' mouse coordinates: ({}, {}) '. Format (self.mouse_x, self.mouse_y)) print (' small circle current coordinates are: ({}, {}) '. Format (self.letter_ball_x1, SELF.LETTER_BALL_Y1) "Gets to the center coordinate of the small circle movement (x2, y2)" ax_x = ABS (self.mouse_x-self.oval_zero_x) ax_y = ABS (Self.mou se_y-self.oval_zero_y) if Show_log:print (' coordinates a (oval_zero_x, oval_zero_y) to coordinate x (mouse_x, mouse_y) distance of Ax ') Prin T (' ax ax_x = {}, ax_y = {} '. Format (ax_x, ax_y)) Ax_len = ((ax_x * * 2) + (AX_Y * 2)) **0.5 if Show_log:print (' A    The length of X is: {} '. Format (Ax_len)) #如果鼠标坐标在 (Ax_len > |r-r|) If Ax_len > Abs (self.oval_r-self.oval_r): Ac_len = ABS (self.oval_r-self.oval_r) if Show_log:print (' AC's yield: {} '. Format (Ac_len)) if int (self.mouse_x-self.oval_zero_x)! = 0:if Int (self.mouse_y-self.oval_zer          o_y)! = 0: #求直线斜率 y = kx + b k = (self.mouse_y-self.oval_zero_y)/(self.mouse_x-self.oval_zero_x) If Show_log:print (' the slope of the line from the mouse to the center of the circle is: {} '. Format (k)) B = self.mOuse_y-(k * self.mouse_x) ################################################### #小圆移动后的坐标 #这里有三 Conditions: # 1. The center coordinate of the small circle (x1, y1) on the line ac (y = kx + b) # 2. (r-r) ^2 = x1^2 + y1^2 by 1, 2 can get = = (r-r) ^2 = x1^2 + 2*x1*k*b + b^2 + x1 has two values, through 3 to determine the X1 symbol, thus finding Y1 # 3.if SEL           f.mousex_x > 0: # x1 > 0 #这是一个二元二次方程, the solution of the equation has two groups, but the position of the mouse self.mouse_x (self.mouse_y) can be judged by the center coordinates x1 (y1) letter_ball_x2 = ((Ac_len * (ABS (self.mouse_x-self.oval_zero_x)))/ax_len) + self.letter_ball_x1 Lette  R_ball_y2 = (LETTER_BALL_X2 * k) + b if show_log:print (' small circle current coordinates are: ({}, {}) '. Format (self.letter_ball_x1, self.letter_ball_y1) print (' small circle moved after coordinates: ({}, {}) '. Format (letter_ball_x2, letter_ball_y2)) #把小圆从坐标 (x1, y 1) move to coordinates (x2, y2) self.moved_x2 = letter_ball_x2-self.letter_ball_x1 Self.moved_y2 = Letter_ball_y2-se lf.letter_ball_y1 if Show_log:print (' The distance to be moved is: ({}, {}) '. foRmat (int (self.moved_x2), int (self.moved_y2))) Self.draw.move (self.ball_over, int (self.moved_x2), int (self.moved_y 2)) self.letter_ball_x1 = letter_ball_x2 self.letter_ball_y1 = Letter_ball_y2 Else:prin      T (' Mouse on X-axis ') else:print (' Mouse on y-axis ') else:if show_log:print (' The coordinates of the small circle's movement are the mouse coordinates ') #小圆移动后的坐标 letter_ball_x2 = self.mouse_x Letter_ball_y2 = self.mouse_y if Show_log:print (' small circle is moved after coordinates: ({}, {}) '. fo Rmat (letter_ball_x2, Letter_ball_y2)) #把小圆从坐标 (x1, y1) move to coordinates (x2, y2) self.moved_x2 = Letter_ball_x2-self.letter_ Ball_x1 self.moved_y2 = letter_ball_y2-self.letter_ball_y1 if Show_log:print (' The distance to be moved is: ({}, {}) '. forma      T (int (SELF.MOVED_X2), int (self.moved_y2))) Self.draw.move (self.ball_over, int (self.moved_x2), int (self.moved_y2)) self.letter_ball_x1 = letter_ball_x2 self.letter_ball_y1 = Letter_ball_y2 def move_ball (self, *args): #当鼠标在窗口中按 The #Widget is executed when you drag the left button. Bind (Self.draw, " 
 
  
   ", Self.mousemove) #当鼠标在大圆内移动的时候执行 self.draw.tag_bind (Self.ball," ", Self.mousemove) def __init__ (self, maste    R=none): global letter_ball_x2 letter_ball_x2 = 0 Global Letter_ball_y2 letter_ball_y2 = 0 Global Show_log Show_log = True frame.__init__ (self, Master) Pack.config (self) self.createwidgets () Self.after (Self.mov E_ball) game = Eay () game.mainloop ()
  
 

I hope this article is helpful for Python program design.

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