python开发之tkinter实现图形随鼠标移动的方法

本文实例讲述了python开发之tkinter实现图形随鼠标移动的方法。分享给大家供大家参考，具体如下：

做这个东西的时候，灵感源自于一个js效果:

两个眼睛随鼠标移动而移动

运行效果：

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代码部分：

from tkinter import *#1.获取到小圆当前的圆心坐标(x1, y1)#2.获取到小圆移动的圆心坐标(x2, y2)#3.把小圆从坐标(x1, y1)移动到坐标(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 = 450    self.mouse_y = 250    #圆心坐标(x,y)    self.oval_zero_x = 250    self.oval_zero_y = 250    #外面大圆半径    self.oval_r = 100    #里面小圆半径    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    #小圆    self.letter_ball_x1 = 250    self.letter_ball_y1 = 250    # The ball 外面大圆    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")    #里面小圆    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('鼠标的坐标为：({}, {})'.format(self.mouse_x, self.mouse_y))      print('小圆当前坐标为：({}, {})'.format(self.letter_ball_x1, self.letter_ball_y1))    '''获取到小圆移动的圆心坐标(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('坐标A(oval_zero_x, oval_zero_y)到坐标X(mouse_x, mouse_y)的距离为AX')      print('AX中ax_x = {}, ax_y = {}'.format(ax_x, ax_y))    ax_len = ((ax_x ** 2) + (ax_y ** 2))**0.5    if SHOW_LOG:      print('AX的长度为：{}'.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的产度为:{}'.format(ac_len))      if int(self.mouse_x - self.oval_zero_x) != 0:        if int(self.mouse_y - self.oval_zero_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('鼠标到大圆圆心的直线的斜率为：{}'.format(k))          b = self.mouse_y - (k * self.mouse_x)          ###################################################          #小圆移动后的坐标          #这里有三个条件：          #  1.小圆的圆心坐标(x1, y1)在直线AC上(y = kx + b)          #  2.(r-R)^2 = x1^2 + y1^2  由1,2可以得到 => (r-R)^2 = x1^2 + 2*x1*k*b + b^2  => x1有两个值，通过3判断x1的符号，从而求出y1          #  3.if self.mousex_x > 0:          #     x1 > 0          #这是一个二元二次方程，方程的解有两组，不过通过鼠标的位置self.mouse_x(self.mouse_y)可以判断圆心坐标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('小圆当前坐标为：({}, {})'.format(self.letter_ball_x1, self.letter_ball_y1))            print('小圆移动后坐标为：({}, {})'.format(letter_ball_x2, letter_ball_y2))          #把小圆从坐标(x1, y1)移动到坐标(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('需要移动的距离是：({}, {})'.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('鼠标在X轴上')       else:        print('鼠标在Y轴上')    else:      if SHOW_LOG:        print('小圆的移动后的坐标就是鼠标坐标')      #小圆移动后的坐标      letter_ball_x2 = self.mouse_x      letter_ball_y2 = self.mouse_y      if SHOW_LOG:        print('小圆移动后坐标为：({}, {})'.format(letter_ball_x2, letter_ball_y2))      #把小圆从坐标(x1, y1)移动到坐标(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('需要移动的距离是：({}, {})'.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):    #当鼠标在窗口中按下左键拖动的时候执行    #Widget.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, master=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(10, self.move_ball)game = Eay()game.mainloop()

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