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.iyunv.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, "", self.mouseMove)
147 #当鼠标在大圆内移动的时候执行
148 self.draw.tag_bind(self.ball, "", 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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