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：
代码部分：
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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, "<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() |
希望本文所述对大家Python程序设计有所帮助。
