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：
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代码部分：
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  1 from tkinter import *
  2 
  3 #1.获取到小圆当前的圆心坐标(x1, y1)
  4 #2.获取到小圆移动的圆心坐标(x2, y2)
  5 #3.把小圆从坐标(x1, y1)移动到坐标(x2, y2)
  6 
  7 __author__ = {'name' : 'Hongten',
  8               'mail' : 'hongtenzone@foxmail.com',
  9               'blog' : 'http://www.cnblogs.com/',
 10               'QQ': '648719819',
 11               'created' : '2013-09-20'}
 12 
 13 class Eay(Frame):
 14     
 15     def createWidgets(self):
 16         ## The playing field
 17         self.draw = Canvas(self, width=500, height=500)
 18 
 19         #鼠标位置
 20         self.mouse_x = 450
 21         self.mouse_y = 250
 22         
 23         #圆心坐标(x,y)
 24         self.oval_zero_x = 250
 25         self.oval_zero_y = 250
 26         #外面大圆半径
 27         self.oval_r = 100
 28         
 29         #里面小圆半径
 30         self.oval_R = 30
 31 
 32         self.oval_r1 = self.oval_r - self.oval_R + 0.5
 33         self.oval_r2 = self.oval_r - self.oval_R - 0.5
 34 
 35 
 36         #小圆
 37         self.letter_ball_x1 = 250
 38         self.letter_ball_y1 = 250
 39                 
 40         # The ball 外面大圆
 41         self.ball = self.draw.create_oval((self.oval_zero_x - self.oval_r),
 42                                           (self.oval_zero_y - self.oval_r),
 43                                           (self.oval_zero_x + self.oval_r),
 44                                           (self.oval_zero_y + self.oval_r),
 45                                           fill="white")
 46 
 47         self.ball = self.draw.create_oval((self.oval_zero_x - self.oval_r1),
 48                                           (self.oval_zero_y - self.oval_r1),
 49                                           (self.oval_zero_x + self.oval_r1),
 50                                           (self.oval_zero_y + self.oval_r1),
 51                                           fill="blue")
 52 
 53         self.ball = self.draw.create_oval((self.oval_zero_x - self.oval_r2),
 54                                           (self.oval_zero_y - self.oval_r2),
 55                                           (self.oval_zero_x + self.oval_r2),
 56                                           (self.oval_zero_y + self.oval_r2),
 57                                           fill="white")
 58         
 59         #里面小圆
 60         self.ball_over = self.draw.create_oval((self.oval_zero_x - self.oval_R),
 61                                                (self.oval_zero_y - self.oval_R),
 62                                                (self.oval_zero_x + self.oval_R),
 63                                                (self.oval_zero_y + self.oval_R),
 64                                                fill="red")
 65 
 66         self.draw.pack(side=LEFT)
 67 
 68     def mouseMove(self, event):
 69         self.mouse_x = event.x
 70         self.mouse_y = event.y
 71 
 72         if SHOW_LOG:
 73             print('#' * 50)
 74             print('鼠标的坐标为：({}, {})'.format(self.mouse_x, self.mouse_y))
 75             print('小圆当前坐标为：({}, {})'.format(self.letter_ball_x1, self.letter_ball_y1))
 76         '''获取到小圆移动的圆心坐标(x2, y2)'''
 77         ax_x = abs(self.mouse_x - self.oval_zero_x)
 78         ax_y = abs(self.mouse_y - self.oval_zero_y)
 79         if SHOW_LOG:
 80             print('坐标A(oval_zero_x, oval_zero_y)到坐标X(mouse_x, mouse_y)的距离为AX')
 81             print('AX中ax_x = {}, ax_y = {}'.format(ax_x, ax_y))
 82         ax_len = ((ax_x ** 2) + (ax_y ** 2))**0.5
 83         if SHOW_LOG:
 84             print('AX的长度为：{}'.format(ax_len))
 85             
 86         #如果鼠标坐标在(ax_len > |r-R|)
 87         if ax_len > abs(self.oval_r - self.oval_R):
 88             ac_len = abs(self.oval_r - self.oval_R)
 89             if SHOW_LOG:
 90                 print('AC的产度为:{}'.format(ac_len))
 91         
 92             if int(self.mouse_x - self.oval_zero_x) != 0:
 93                 if int(self.mouse_y - self.oval_zero_y) != 0:
 94                     #求直线斜率  y = kx + b
 95                     k = (self.mouse_y - self.oval_zero_y)/(self.mouse_x - self.oval_zero_x)
 96                     if SHOW_LOG:
 97                         print('鼠标到大圆圆心的直线的斜率为：{}'.format(k))
 98                     b = self.mouse_y - (k * self.mouse_x)
 99                     ###################################################
100                 
101                     #小圆移动后的坐标
102                     #这里有三个条件：
103                     #    1.小圆的圆心坐标(x1, y1)在直线AC上(y = kx + b)
104                     #    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
105                     #    3.if self.mousex_x > 0:
106                     #          x1 > 0
107                     #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)
108                     letter_ball_x2 = ((ac_len * (abs(self.mouse_x - self.oval_zero_x)))/ax_len) + self.letter_ball_x1
109                     letter_ball_y2 = (letter_ball_x2 * k) + b
110                     if SHOW_LOG:
111                         print('小圆当前坐标为：({}, {})'.format(self.letter_ball_x1, self.letter_ball_y1))
112                         print('小圆移动后坐标为：({}, {})'.format(letter_ball_x2, letter_ball_y2))
113 
114                     #把小圆从坐标(x1, y1)移动到坐标(x2, y2)
115                     self.moved_x2 = letter_ball_x2 - self.letter_ball_x1
116                     self.moved_y2 = letter_ball_y2 - self.letter_ball_y1
117                     if SHOW_LOG:
118                         print('需要移动的距离是：({}, {})'.format(int(self.moved_x2), int(self.moved_y2)))
119                     self.draw.move(self.ball_over, int(self.moved_x2), int(self.moved_y2))
120                     self.letter_ball_x1 = letter_ball_x2
121                     self.letter_ball_y1 = letter_ball_y2
122                 else:
123                     print('鼠标在X轴上') 
124             else:
125                 print('鼠标在Y轴上')
126         else:
127             if SHOW_LOG:
128                 print('小圆的移动后的坐标就是鼠标坐标')
129             #小圆移动后的坐标
130             letter_ball_x2 = self.mouse_x
131             letter_ball_y2 = self.mouse_y
132             if SHOW_LOG:
133                 print('小圆移动后坐标为：({}, {})'.format(letter_ball_x2, letter_ball_y2))
134 
135             #把小圆从坐标(x1, y1)移动到坐标(x2, y2)
136             self.moved_x2 = letter_ball_x2 - self.letter_ball_x1
137             self.moved_y2 = letter_ball_y2 - self.letter_ball_y1
138             if SHOW_LOG:
139                 print('需要移动的距离是：({}, {})'.format(int(self.moved_x2), int(self.moved_y2)))
140             self.draw.move(self.ball_over, int(self.moved_x2), int(self.moved_y2))
141             self.letter_ball_x1 = letter_ball_x2
142             self.letter_ball_y1 = letter_ball_y2
143     
144     def move_ball(self, *args):
145         #当鼠标在窗口中按下左键拖动的时候执行
146         #Widget.bind(self.draw, "<B1-Motion>", self.mouseMove)
147         #当鼠标在大圆内移动的时候执行
148         self.draw.tag_bind(self.ball, "<Any-Enter>", self.mouseMove)
149 
150     def __init__(self, master=None):
151         global letter_ball_x2
152         letter_ball_x2 = 0
153         global letter_ball_y2
154         letter_ball_y2 = 0
155         global SHOW_LOG
156         SHOW_LOG = True
157         
158         Frame.__init__(self, master)
159         Pack.config(self)
160         self.createWidgets()
161         self.after(10, self.move_ball)
162 
163 game = Eay()
164 
165 game.mainloop()
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