-
Notifications
You must be signed in to change notification settings - Fork 34
/
203_图形计算器.py
131 lines (115 loc) · 4.49 KB
/
203_图形计算器.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
# 作者：西岛闲鱼
# https://github.com/globien/easy-python
# https://gitee.com/globien/easy-python
# 图形计算器（功能尚不完整，可做加减乘除，没有正负变换和百分号功能）
def get_input(x, y):
# 把以下变量声明为全局变量，以便可以在函数内修改它们
global operand
global operator
global operand_pt
global operator_pt
global is_result
if -115 <= x < -59 and 42 <= y < 90: # key 'AC'
clear_all()
elif -115 <= x < -1 and -150 <= y < -102: # key '0'
if is_result:
clear_all()
else:
operand[operand_pt] += '0'
elif -1 <= x < 57 and -150 <= y < -102: # key '.'
if '.' not in operand[operand_pt]:
if is_result:
clear_all()
operand[operand_pt] += '.'
is_result = False
elif -115 <= x < 57 and -102 <= y < 42: # key '1~9'
if is_result:
clear_all()
operand[0] = ''
digit = int(x + 115) // 57 + 1 + int(y + 102) // 48 * 3
operand[operand_pt] += str(digit)
is_result = False
elif 57 <= x < 118 and -150 <= y < -102: # key '='
operand[0] = get_result()
elif 57 <= x < 118 and -102 <= y < -5: # key '+' and '-'
operand[0] = get_result()
operator[0] = '+' if y<-53 else '-'
operand_pt += 1
operator_pt += 1
is_result = False
elif 57 <= x < 118 and -5 <= y < 90: # key '*' and '/', 根据情况可能需要先做部分运算
if operator_pt == 0:
operator[0] = '*' if y < 42 else '/'
operator_pt = operand_pt = 1
elif operator_pt == 1:
if operator[0] in ['*', '/']: # 前面是乘除号，先计算前面的结果
operand[0] = get_result()
operator[0] = '*' if y < 42 else '/'
operator_pt = operand_pt = 1
else: # 前面是加减号，暂不做计算
operator[1] = '*' if y < 42 else '/'
operator_pt = operand_pt = 2
else: # operator_pt == 2，即按下了第三个算符，需要立即做部分运算
operand[1] = get_result(partial=True)
operand[2] = ''
operator[1] = '*' if y < 42 else '/'
operand_pt = 2
is_result = False
else: # key '+/-' and '%' are not effective
pass
# 每次按键都刷新显示最新的数字
tt.clear()
if operand[operand_pt] == '':
display(operand[operand_pt - 1]) # 当前位置没有输入新的数字，只计算前面的表达式并显示，但要保留最后一个算符
else:
display(operand[operand_pt]) # 计算全部表达式并显示
def get_result(partial=False):
# 计算并返回一个表达式的结果
if partial:
exp = operand[1] + operator[1] + operand[2]
else:
exp = operand[0] + operator[0] + operand[1] + operator[1] + operand[2]
clear_all()
if exp[-1] in ['+', '-', '*', '/']:
exp = exp[:-1] # 结尾如果是一个运算符，它不参与运算
try:
result = '%g' % eval(exp) # 根据结果大小决定是否使用科学记数法
except:
result = 'Error'
return result
def display(number):
# 显示输入的数字或运算结果
tt.write(number, align='right', font=('Arial', 32, 'normal'))
if number == 'Error':
clear_all()
def clear_all():
# 把以下变量声明为全局变量，以便可以在函数内修改它们
global operand
global operator
global operand_pt
global operator_pt
global is_result
# 初始化输入数据和状态，保存最多3个数和最多2个运算符，以及各自目前的指向位置
operand = ['0', '', '']
operator = ['', '']
operand_pt = 0
operator_pt = 0
is_result = True
if __name__ == '__main__':
import turtle
# 初始化数据部分
operand = operator = []
operand_pt = operator_pt = 0
is_result = True
clear_all()
# 初始化显示部分，并等待屏幕点击，然后调用自定义函数处理每一次点击
turtle.setup(420, 500)
turtle.bgpic('img/图形计算器.png')
tt = turtle.Turtle()
tt.hideturtle()
tt.penup()
tt.color('white')
tt.goto(102, 90)
display('0')
turtle.onscreenclick(get_input)
turtle.done()