python开发_tkinter_图形随鼠标移动

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：

===============================================

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://www.cnblogs.com/',
               'QQ': '',
               '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, "<B1-Motion>", self.mouseMove)
         #当鼠标在大圆内移动的时候执行
         self.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
         SHOW_LOG = True

         Frame.__init__(self, master)
         Pack.config(self)
         self.createWidgets()
         self.after(10, self.move_ball)

 game = Eay()

 game.mainloop()

========================================================

More reading,and english is important.

I'm Hongten

大哥哥大姐姐，觉得有用打赏点哦！多多少少没关系，一分也是对我的支持和鼓励。谢谢。
Hongten博客排名在100名以内。粉丝过千。
Hongten出品，必是精品。

E | hongtenzone@foxmail.com  B | http://www.cnblogs.com/hongten

========================================================