def set_equation(self, entry):
self.funct = Equation(entry)[1]
self.funct_display.config(text = entry)
self.entry_line.delete(0, END)
class Runner:
def __init__(self, master):
self.master = master
self.master.minsize(500, 200)
self.entry_line = Entry(master)
self.entry_line.grid(row = 0, column = 0, columnspan = 4)
self.clearer = Button(master, text = 'Clear', command = self.clear)
self.clearer.grid(row = 1, column = 0)
self.enterer = Button(master, text = 'Enter',\
command = self.manage_input)
self.enterer.grid(row = 1, column = 1)
self.grapher = Button(master, text = 'Graph',\
command = self.graph)
self.grapher.grid(row = 2, column = 0)
self.funct_display = Label(master, text = 'Enter a function.')
self.funct_display.grid(row = 1, column = 2)
self.result_display = Label(master, text = '')
self.result_display.grid(row = 1, column = 3)
self.funct = None
def manage_input(self):
#If there is no entry and the user tries to enter, prompts entry again
if self.entry_line != None:
entry = self.entry_line.get()
if entry == '':
self.funct_display.config(text = 'Try again.')
#If there is no function and the user enters a valid input, identifies
#the type of input, then stores the function and its variables
if self.funct == None:
#counts the number of equals signs; 0 = fn, 1 = eqn, 2+ = param
num = entry.count('=')
if num == 0:
self.set_function(entry)
self.add_variable_entries(\
list(self.funct.get_variables().keys()))
if num == 1:
self.set_equation(entry)
self.add_variable_entries(\
list(self.funct[1].get_variables().keys()))
if num > 1:
#try catch allows parametric equations to be separated by
#semi-colons or commas
try:
entries = re.findall('(. *= *.+?)(?:;|,|$)', entry)
self.set_parametric_equation(entries)
self.add_variable_entries(self.funct.get_variables())
except IndexError:
entries = re.findall('(. *= *.+?)(?:;|$)', entry)
self.set_parametric_equation(entries)
self.add_variable_entries(self.funct.get_variables())
#automatically evaluates the input if there are no variables
if self.var_names == []:
if type(self.funct) == type(Function('')):
self.eval_function({})
if type(self.funct) == type(ParamEqn()):
self.eval_parametric_function({})
#if there are variables, prompts variable inputs
else:
self.result_display.config(\
text = 'Enter values for evaluation.')
#if the entry line is not gone, removes it. Ensures that the
#input provides a tactile sensation
if self.entry_line != None:
self.entry_line.destroy()
self.entry_line = None
#if there is a function, identifies it then evaluates it based on
#the entered variables
elif type(self.funct) == type(Function('')):
self.eval_function(self.get_variable_entries())
elif type(self.funct) == type(ParamEqn()):
self.eval_parametric_function(self.get_variable_entries())
def set_function(self, entry):
self.funct = Function(entry)
self.funct_display.config(text = str(self.funct))
self.entry_line.delete(0, END)
def set_equation(self, entry):
self.funct = Equation(entry)[1]
self.funct_display.config(text = entry)
self.entry_line.delete(0, END)
def set_parametric_equation(self, entries):
self.funct = ParamEqn(entries)
self.funct_display.config(text = str(self.funct))
self.entry_line.delete(0, END)
def eval_function(self, entry):
val = self.funct.evaluate(entry)
if entry == {}:
self.result_display.config(text = '= ' + str(val))
else:
self.result_display.config(text = 'evaluated where ' + \
str(entry) + ' = ' + str(val))
def eval_parametric_function(self, entry):
val = self.funct.evaluate(entry, printing = True)
if entry == {}:
self.result_display.config(text = '= ' + str(val))
else:
self.result_display.config(text = 'evaluated where ' + \
str(entry) + ' = ' + str(val))
def add_variable_entries(self, variables = []):
"""adds the list of variables and their accompanying entry lines"""
count = 0
self.entries = []
self.labels = []
while count < len(variables):
self.labels.append(Label(self.master, text = variables[count]))
self.labels[count].grid(row = 2 + count // 2,\
column = 1 + 2 * (count % 2))
self.entries.append(Entry(self.master))
self.entries[count].grid(row = 2 + count // 2,\
column = 2 + 2 * (count % 2))
count += 1
self.var_names = variables
def get_variable_entries(self):
var_values = []
for i in self.entries:
var_values.append(i.get())
return dict(zip(self.var_names, var_values))
def graph(self):
if type(self.funct) == type(Function('')):
graph(self.funct)
elif type(self.funct) == type(Equation('')):
graph(self.funct[1])
else:
graph_par(self.funct)
def clear(self):
self.funct = None
self.result_display.config(text = '')
self.funct_display.config(text = 'Enter a function.')
self.entry_line = Entry(self.master)
self.entry_line.grid(row = 0, column = 0, columnspan = 4)
count = 0
while count < len(self.labels):
self.labels[count].destroy()
self.entries[count].destroy()
count += 1
def set_function(self, entry):
self.funct = Function(entry)
self.funct_display.config(text = str(self.funct))
self.entry_line.delete(0, END)
def set_parametric_equation(self, entries):
self.funct = ParamEqn(entries)
self.funct_display.config(text = str(self.funct))
self.entry_line.delete(0, END)
