Python tkinter implements the method of moving graphics with the mouse, pythontkinter

Python tkinter implements the method of moving graphics with the mouse, pythontkinter

This article describes how to move a graph with the mouse using tkinter developed in python. We will share this with you for your reference. The details are as follows:

This is inspired by a js effect:

Two eyes move with the mouse

Running effect:

Code Section:

From tkinter import * #1. obtain the coordinates of the current circle (x1, y1) #2. obtain the Center Coordinate (x2, y2) of the circle moving from the incircle #3. move the circle from the coordinate (x1, y1) to the coordinate (x2, y2) _ author _ = {'name': 'hongten ', 'mail ': 'hongtenzone @ foxmail.com ', 'blog': 'http: // blog.csdn.net/', 'qq': '000000', 'created ': '2017-09-20 '} class Eay (Frame): def createWidgets (self): # The playing field self. draw = Canvas (self, width = 500, height = 500) # cursor position self. mouse_x = 450 self. mouse_y = 250 # Center Coordinate (x, y) self. oval_zero_x = 250 self. oval_zero_y = 250 # self. oval_r = 100 # inner circle radius self. oval_R = 30 self. oval_r1 = self. oval_r-self. oval_R + 0.5 self. oval_r2 = self. oval_r-self. oval_R-0.5 # small circle self. letter_ball_x1 = 250 self. letter_ball_y1 = 250 # self. ball = self. draw. create_oval (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 = "white") self. ball = self. draw. create_oval (self. oval_zero_x-self. oval_r1), (self. oval_zero_y-self. oval_r1), (self. oval_zero_x + self. oval_r1), (self. oval_zero_y + self. 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") # Inner Circle self. ball_over = self. draw. create_oval (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_LOG: print ('#' * 50) print ('coordinates of the mouse :({},{})'. format (self. mouse_x, Self. mouse_y) print ('current coordinate of the incircle is :({},{})'. format (self. letter_ball_x1, self. letter_ball_y1) ''' to obtain the circle coordinate (x2, y2) ''' ax_x = abs (self. mouse_x-self. oval_zero_x) ax_y = abs (self. mouse_y-self. oval_zero_y) if SHOW_LOG: print ('coordinate A (oval_zero_x, oval_zero_y) to coordinate X (mouse_x, mouse_y) distance is AX ') print ('ax_x ={} in AX {}, 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) # if the mouse coordinates are in (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 production :{}'. format (ac_len) if int (self. mouse_x-self. oval_zero_x )! = 0: if int (self. mouse_y-self. oval_zero_y )! = 0: # Calculate the straight line slope 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) ######################################## ########### coordinates after a circle is moved # three conditions are provided: #1. the circle center coordinates (x1, y1) of a small circle are on the AC (y = kx + B) #2. (r-R) ^ 2 = x1 ^ 2 + y1 ^ 2 can be obtained from 1, 2 => (r-R) ^ 2 = x1 ^ 2 + 2 * x1 * k * B + B ^ 2 => x1 has two values. Use 3 to judge the symbol of x1 and then obtain y1 # 3.if self. mousex_x> 0: # x1> 0 # This is a binary quadratic equation. There are two groups of solutions to the equation. However, you can use the cursor position self. mouse_x (self. mouse_y) to determine the coordinates of the center x1 (y1) letter_ball_x2 = (ac_len * (abs (self. mouse_x-self. oval_zero_x)/ax_len) + self. letter_ball_x1 letter_ball_y2 = (letter_ball_x2 * k) + B if SHOW_LOG: print ('current coordinate of a circle is :({},{})'. format (self. letter_ball_x1, self. letter_ball_y1) print ('coordinate after the circle is moved :({},{})'. format (letter_ball_x2, letter_ball_y2) # Move the circle from the coordinate (x1, y1) to the coordinate (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 :({},{})'. format (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 else: print ('Place the cursor over the X axis ') else: print ('Place the cursor over the Y axis') else: if SHOW_LOG: print ('coordinates after the circle is moved are the mouse coordinates ') # coordinate after the circle is moved letter_ball_x2 = self. mouse_x letter_ball_y2 = self. mouse_y if SHOW_LOG: print ('the coordinates after the circle is moved are :({},{})'. format (letter_ball_x2, letter_ball_y2) # Move the circle from the coordinate (x1, y1) to the coordinate (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 :({},{})'. format (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): # execute when you press the left button in the window and drag it # Widget. bind (self. draw, "<B1-Motion>", self. mouseMove) # execute self when the mouse moves inside the circle. draw. tag_bind (self. ball, "<Any-Enter>", self. mouseMove) def _ init _ (self, master = None): global letter_ball_x2 letter_ball_x2 = 0 global letter_ball_y2 letter_ball_y2 = 0 global SHOW_LOG = True Frame. _ init _ (self, master) Pack. config (self) self. createWidgets () self. after (10, self. move_ball) game = Eay () game. mainloop ()

I hope this article will help you with Python programming.