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App.py
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App.py
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import re
from tkinter import *
from Classes import *
try:
from PIL import Image, ImageDraw, ImageTk
pil = True
except ImportError:
pil = False
# Searches for brackets
def find_brackets(form):
if '(' in form and ')' in form:
for g, q in enumerate(form):
if q == ')':
for j in range(g, -1, -1):
if form[j] == '(':
return (j, g)
else:
return False
def solve(form):
try:
# Convert float to fraction
for j, q in enumerate(form):
if isinstance(q, Element):
temp = q.new()
if isinstance(temp.value, float):
den = 1
while temp.value % 1 != 0:
den *= 10
temp.value *= 10
form[j] = Fraction(temp, Element(den)).simplify()
# Solve brackets ( and )
index = find_brackets(form)
while index:
form = form[:index[0]] + [solve(form[index[0] + 1:index[1]])] + form[index[1] + 1:]
# Find functions eg. sin, cos, tan
temp_map = list(Function.functions_map.keys())
while any((j in temp_map) for j in form):
for h, q in enumerate(form):
if q in temp_map:
if not isinstance(form[h + 1], str):
form = form[:h] + [Function(form[h + 1], q).simplify()] + form[h + 2:]
break
# Find powers
while '^' in form:
for h, q in enumerate(form):
if q == '^':
form = form[:h - 1] + [(form[h - 1] ** form[h + 1]).simplify()] + form[h + 2:]
break
# Find times and divide
while '*' in form or '/' in form:
for h, q in enumerate(form):
if q == '*':
form = form[:h - 1] + [(form[h - 1] * form[h + 1]).simplify()] + form[h + 2:]
break
if q == '/':
form = form[:h - 1] + [(form[h - 1] / form[h + 1]).simplify()] + form[h + 2:]
break
# Find addition
while '+' in form:
for h, q in enumerate(form):
if q == '+':
form = form[:h - 1] + [(form[h - 1] + form[h + 1]).simplify()] + form[h + 2:]
break
return form[0]
except Exception:
return 'Error'
# View control variables
radius = 150
zoom = 16.0
center = (0, 0)
graph_true = False
# Initialise GUI
root = Tk()
root.configure(background='#222')
root.wm_title('Calculator')
img = PhotoImage(file='resources/calc.png')
root.tk.call('wm', 'iconphoto', root._w, img)
graph = Frame(root, bg='#222')
graph.pack(side=RIGHT)
viewport = Canvas(graph, width=radius * 2 + 1, height=radius * 2 + 1, highlightthickness=2, highlightbackground="#444",
cursor='fleur')
viewport.configure(background='#222')
viewport.pack()
buttons = Frame(root, bg='#222')
buttons.pack()
textDisplay = Frame(buttons, height=4, width=43, bg='#222')
textDisplay.grid(row=0, column=0, columnspan=7)
textDisplay.grid_rowconfigure(1, pad=10)
answerOut = Text(textDisplay, font=('Arial', 14), height=1, width=25, fg='#FFF', bg='#222', borderwidth=0,
state="disabled")
answerOut.tag_config('right', justify=RIGHT)
answerOut.grid(column=0, row=0, pady=(15, 0))
formulaOut = Text(textDisplay, font=('Arial', 12), height=1, pady=2, padx=5, width=35, fg='#111',
bg='#EEE', borderwidth=0)
formulaOut.grid(column=0, row=1)
# Draw the cartesian plane
def draw_plane(bg_color='#65C050', color='#DDD'):
viewport.delete("all")
viewport.create_rectangle(radius + center[0] * zoom, 0, radius + center[0] * zoom, radius * 2 + 1,
fill=bg_color, outline=bg_color)
viewport.create_rectangle(0, radius + center[1] * zoom, radius * 2 + 1, radius + center[1] * zoom,
fill=bg_color, outline=color)
# Draw scale numbers
# Top
viewport.create_text(radius + center[0] * zoom - 15, 8,
text=str(round((radius+zoom*center[1])/zoom, 2)), fill=color)
# Bottom
viewport.create_text(radius + center[0] * zoom - 15, radius*2-5,
text=str(-round((radius-zoom*center[1])/zoom, 2)), fill=color)
# Left
viewport.create_text(20, radius + center[1] * zoom-10,
text=str(-round((radius+zoom*center[0])/zoom, 2)), fill=color)
# Right
viewport.create_text(radius*2-20, radius + center[1] * zoom-10,
text=str(round((radius-zoom*center[0])/zoom, 2)), fill=color)
# Draw lines between the 2 points
def precision(x1, y1, x2, y2):
y2 = round(float(y2), 10)
viewport.create_line(round(x1 + radius), round(radius - y1), round(x2 + radius),
radius - y2, fill='#EEE')
draw_plane()
# Make global variables
formula = ''
prev_formula = ''
rendered = False
decimal_value = False
antialias_rendering = False
prevRendered = {}
pattern = re.compile("\s*(?:(-?(?:(?:\d+\.\d+)|(?:\d+)))|(" +
'|'.join(sorted(list(Function.functions_map.keys()), reverse=True)) +
"|\()|(\+|\-|\*|/|\^|\))|(.))")
# Compile formula into an object
def create_object():
global formula, prevRendered
prevRendered = {}
equation = formulaOut.get(0.0, END).replace(' ', '')
tokens = []
# HELPER FUNCTIONS
def previous_is(previous_value):
return len(tokens) != 0 and tokens[-1] == previous_value
def previous_type_is(previous_type):
return len(tokens) != 0 and isinstance(tokens[-1], previous_type)
def pre_elem_parenthesis():
return previous_is(')') or previous_type_is(Element)
# Creates list of tokens
for number, function, operator, variable in pattern.findall(equation):
# Searches for numbers
if number:
val = float(number)
if pre_elem_parenthesis():
if val < 0:
tokens.append('+')
else:
tokens.append('*')
tokens.append(Element(val))
# Searches for functions eg. sin, cos, abs
elif function:
if pre_elem_parenthesis():
tokens.append('*')
tokens.append(function)
# Checks for operators -> [+, -, *, /, ^, )]
elif operator:
if operator == '-':
if pre_elem_parenthesis():
tokens.append('+')
tokens.append(Element(-1.0))
continue
tokens.append(operator)
# Checks for single letter variables
elif variable:
if pre_elem_parenthesis():
tokens.append('*')
tokens.append(Element(variable))
formula = solve(tokens)
calculate()
# Display equation out
def equation_out(data, add=''):
answerOut.configure(state="normal")
answerOut.delete("1.0", END)
if decimal_value:
try:
# Solve the equation
temp = data.new()
temp.sub('π', 3.141592653589793238462643383279502884197)
temp.sub('e', 2.71828182845904523536028747135)
answerOut.insert(END, add + str(temp.force_solve()), 'right')
except (ValueError, ZeroDivisionError, AttributeError):
answerOut.insert(END, 'Error', 'right')
else:
try:
answerOut.insert(END, add + str(data.solve()), 'right')
except (ValueError, ZeroDivisionError, AttributeError):
answerOut.insert(END, 'Error', 'right')
answerOut.configure(state="disabled")
# Calculate or render the value
def calculate():
global rendered
# time1 = time.clock()
data = formula
draw_plane()
if graph_true:
rendered = True
last_y = ''
# Antialiasing value
antialias = 4
resize = radius * antialias
image = Image.new('RGBA', (resize * 2 + 1, resize * 2 + 1))
draw = ImageDraw.Draw(image)
try:
# Sub in values from -radius to radius and draw them
for x in range(-radius, radius + 2):
x = (x / zoom) - center[0]
if x in prevRendered.keys():
# If value is stored in cache, use it
y = prevRendered[x]
else:
# Render and store value in cache
if isinstance(data, str):
continue
y = data.new()
y.sub('x', x)
y.sub('π', 3.141592653589793238462643383279502884197)
y.sub('e', 2.71828182845904523536028747135)
try:
# Solve the equation
y = y.force_solve().simplify()
except (ValueError, ZeroDivisionError, AttributeError):
continue
# Store in cache
prevRendered[x] = y
if not isinstance(y, Element):
continue
if 'j' in str(y):
continue
y = y.value
try:
# Draw line between current point and last point
y = (y - center[1]) * zoom
x = (x + center[0]) * zoom
if antialias_rendering and pil:
# Smooth
if not (abs(resize - y) < radius and abs(resize - float(last_y)) < radius) and \
abs(float(last_y) - y) < radius*2+1:
draw.line((round(antialias * x + resize), round(resize - y * antialias),
round(antialias * (x - 1) + resize),
round(resize - float(last_y) * antialias)), fill='#FFF',
width=round(antialias * 1.5))
else:
# Fast
if not (abs(resize - y) < radius and abs(resize - float(last_y)) < radius) and \
abs(float(last_y) - y) < radius*2+1:
viewport.create_line(round(x + radius), round(radius - y),
round(x - 1 + radius), radius - round(float(last_y), 10), fill='#EEE')
except ValueError:
pass
last_y = y
del draw
if antialias_rendering and pil:
# Resize rendered image to get antialiasing
image = ImageTk.PhotoImage(image.resize((radius * 2, radius * 2), Image.LINEAR))
# Draw to canvas
viewport.create_image((radius + 1, radius + 1), image=image)
viewport.image = image
# Display equation
equation_out(data, 'y = ')
except OverflowError:
pass
else:
# Display equation
equation_out(data)
# print(time.clock()-time1) # PERFORMANCE TESTING
# Clear all
def clear():
global rendered, prevRendered, formula
formula = ''
prevRendered = {}
rendered = False
answerOut.configure(state="normal")
answerOut.delete("1.0", END)
answerOut.configure(state="disabled")
formulaOut.delete("1.0", END)
viewport.delete('all')
draw_plane()
# Delete last value
def delete():
temp = formulaOut.get(0.0, END).replace('\n', '')
formulaOut.delete(0.0, END)
formulaOut.insert(END, re.sub('(' + '|'.join(list(Function.functions_map.keys())) +
'|[a-zA-Zπ]|\d|\-|\+|\*|÷|\.|\(|\)|\^)$', '', temp))
# GUI elements
graphControls = Frame(graph, bg='#222', pady=3)
graphControls.pack(side=BOTTOM)
zoomText = Text(graphControls, width=10, height=1, bg='#222', fg='#EEE', borderwidth=0)
zoomText.tag_config('center', justify=CENTER)
zoomText.insert(END, str(zoom) + '×', 'center')
zoomText.configure(state='disabled')
# Add to the formula
def add_formula(c):
formulaOut.insert(END, str(c))
# Initialise GUI B]buttons
for i in range(9):
Button(buttons, text=str(i + 1), font=('arial', 14), width=4, height=2, command=lambda j=i: add_formula(j + 1),
bg='#65c050', activebackground='#80d575', cursor='hand2', borderwidth=0).grid(row=3 - (i // 3), column=i % 3)
symbols = ['+', '-', '*', '/', 'sin', 'cos', '(', ')']
for i, v in enumerate(symbols):
Button(buttons, text=v, font=('arial', 14), width=4, height=2,
command=lambda j=i: add_formula(symbols[j]),
bg='#65c050', activebackground='#80d575', cursor='hand2', borderwidth=0).grid(row=i // 2 + 1,
column=i % 2 + 3)
Button(buttons, text='.', font=('arial', 14), width=4, height=2, command=lambda: add_formula('.'),
bg='#65c050', activebackground='#80d575', cursor='hand2', borderwidth=0).grid(row=4, column=0)
Button(buttons, text='0', font=('arial', 14), width=4, height=2, command=lambda: add_formula('0'),
bg='#65c050', activebackground='#80d575', cursor='hand2', borderwidth=0).grid(row=4, column=1)
Button(buttons, text='x', font=('arial', 14), width=4, height=2, command=lambda: add_formula('x'),
bg='#65c050', activebackground='#80d575', cursor='hand2', borderwidth=0).grid(row=4, column=2)
Button(buttons, text='^', font=('arial', 14), width=4, height=2, command=lambda: add_formula('^'),
bg='#65c050', activebackground='#80d575', cursor='hand2', borderwidth=0).grid(row=2, column=5)
Button(buttons, text='e', font=('arial', 14), width=4, height=2, command=lambda: add_formula('e'),
bg='#65c050', activebackground='#80d575', cursor='hand2', borderwidth=0).grid(row=4, column=6)
Button(buttons, text='tan', font=('arial', 14), width=4, height=2, command=lambda: add_formula('tan'),
bg='#65c050', activebackground='#80d575', cursor='hand2', borderwidth=0).grid(row=3, column=5)
Button(buttons, text='√', font=('arial', 14), width=4, height=2, command=lambda: add_formula('√'),
bg='#65c050', activebackground='#80d575', cursor='hand2', borderwidth=0).grid(row=3, column=6)
Button(buttons, text='π', font=('arial', 14), width=4, height=2, command=lambda: add_formula('π'),
bg='#65c050', activebackground='#80d575', cursor='hand2', borderwidth=0).grid(row=4, column=5)
Button(buttons, text="=", font=('arial', 14), width=4, height=2, command=create_object, bg='#65c050',
activebackground='#80d575', cursor='hand2',
borderwidth=0).grid(row=2, column=6)
Button(buttons, text="ac", font=('arial', 14), width=4, height=2, command=clear, bg='#65c050',
activebackground='#80d575', cursor='hand2',
borderwidth=0).grid(row=1, column=6)
Button(buttons, text="del", font=('arial', 14), width=4, height=2, command=delete, bg='#65c050',
activebackground='#80d575', cursor='hand2',
borderwidth=0).grid(row=1, column=5)
# Check button for graphing on/off
def check_graph():
global graph_true
graph_true = not graph_true
viewport.delete('all')
draw_plane()
answerOut.configure(state="normal")
answerOut.delete("1.0", END)
answerOut.insert(END, str(formula), 'right')
answerOut.configure(state="disabled")
if graph_true:
calculate()
# Check button for antialias on/off
def switch_rendering():
global antialias_rendering
antialias_rendering = not antialias_rendering
calculate()
# Check button for decimal value on/off
def switch_decimal():
global decimal_value
decimal_value = not decimal_value
calculate()
# Check boxes GUI initialisation
checkBoxes = Frame(root)
checkBoxes.pack()
Checkbutton(checkBoxes, text="Graph", bg='#65c050', activebackground='#80d575', fg="#111", cursor='hand2',
command=check_graph).grid(row=0, column=0)
Checkbutton(checkBoxes, text="Antialias", bg='#65c050', activebackground='#80d575', fg="#111", cursor='hand2',
command=switch_rendering).grid(row=0, column=1)
Checkbutton(checkBoxes, text="Decimal", bg='#65c050', activebackground='#80d575', fg="#111", cursor='hand2',
command=switch_decimal).grid(row=0, column=3)
zoomText.pack(side=LEFT)
onCanvas = False
startPoint = (0, 0)
# Moving canvas with mouse
def motion(event):
global startPoint, center
if startPoint != (0, 0):
distance_x = (event.x - startPoint[0]) / zoom
distance_y = (event.y - startPoint[1]) / zoom
startPoint = (event.x, event.y)
center = (center[0] + distance_x, center[1] + distance_y)
if rendered:
calculate()
else:
draw_plane()
def enter(event):
global onCanvas
onCanvas = True
def leave(event):
global onCanvas
onCanvas = False
def clicked(event):
global startPoint
if onCanvas:
startPoint = (event.x, event.y)
def released(event):
global startPoint
startPoint = (0, 0)
# Zooming in and out using scroll wheel
def scroll_zoom(event):
global zoom
if event.delta > 0:
z = 2
else:
z = 0.5
if z >= 1 and zoom < 5000:
zoom *= z
if z < 1 and zoom > 0.01:
zoom *= z
zoom = float(zoom)
zoomText.configure(state='normal')
zoomText.delete("1.0", END)
zoomText.insert(END, str(zoom) + '×', 'center')
zoomText.configure(state='disabled')
if rendered:
calculate()
else:
draw_plane()
viewport.bind('<Enter>', enter)
viewport.bind('<Leave>', leave)
root.bind('<Button-1>', clicked)
root.bind('<ButtonRelease-1>', released)
root.bind('<B1-Motion>', motion)
viewport.bind("<MouseWheel>", scroll_zoom)
root.resizable(width=FALSE, height=FALSE)
root.mainloop()