python tkinter制作一个可以被拖动的组件
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发布时间：2022-04-21 10:09
共2个回答
热心网友
时间：2022-05-11 02:46
#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': '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()
效果
