Skip math domain error

graph.py

@@ -69,18 +69,18 @@ class Graph(turtle.Pen, Tools):
 	def plot(self, function, start, stop, color="blue"):
 		"""Plot a function"""
 		medium = 2 / self.X
+		init = True
 		self.color(color)
-		try:
-			self.go(start, function(start))
-		except ZeroDivisionError:
-			self.go(start, function(start + 1 * medium))
 		for x in range(int(start / medium), int(stop / medium) + 1):
 			x *= medium
 			try:
+				if init:
+					self.go(x, function(x))
+					init = False
+				else:
 					self.goto(x, function(x))
-			except ZeroDivisionError:
-				self.go(x, function(x + 1 * medium))
-
+			except Exception:
+				continue
 	def clean(self):
 		"""Clean the canvas redraw axes"""
 		self.reset()

plotter.py

@@ -1,8 +1,8 @@
 import tkinter
 import tkinter.filedialog
 import re
-#import canvas2svg
 from math import *
+import canvasvg
 import graph
 
 
@@ -52,7 +52,7 @@ class Application(tkinter.Frame):
 			command=self.label)
 		self.choose2 = tkinter.Radiobutton(
 			window,
-			value="punti",
+			value="points",
 			text="Points",
 			variable=self.type,
 			command=self.label)
@@ -157,7 +157,7 @@ class Application(tkinter.Frame):
 	def plot(self):
 		"""Plot the data"""
 
-		#Converte la function in modo che possa essere interpretata da eval().
+		# Prapare function for evaluation.
 		function = re.sub(
 			"([\+-\-]?\d+)(x)",
 			"\\1*x",
@@ -171,7 +171,7 @@ class Application(tkinter.Frame):
 			"factorial(\\1)",
 			function)
 
-		#Legge l'interval inserito.
+		# set interval
 		try:
 			interval = eval(self.textbox2.get())
 		except SyntaxError:
@@ -181,12 +181,12 @@ class Application(tkinter.Frame):
 			start = float(interval[0])
 			stop = float(interval[1])
 
-		#Legge il color inserito.
+		# set color
 		color = self.textbox3.get()
 		if color == "":
 			color = "orange"
 
-		#Disegna il graph in base al type inserito.
+		# draw graph based on choosed type
 		if self.type.get() == "normal":
 			function = eval("lambda x:" + function)
 			self.graph.plot(function, start, stop, color)
@@ -200,11 +200,11 @@ class Application(tkinter.Frame):
 					function[1][1],
 					color)
 		else:
-			function = graph.punti(eval(self.textbox1.get()))
+			function = graph.points(eval(self.textbox1.get()))
 			self.graph.plot(
 				function,
-				punti[0][0],
-				punti[len(punti) - 1][1],
+				points[0][0],
+				points[len(points) - 1][1],
 				color)
 
 	def clear(self):
@@ -219,10 +219,10 @@ class Application(tkinter.Frame):
 			"parent": self.frame,
 			"defaultextension": ".svg",
 			"initialfile": "graph.svg",
-			"title": "Salva il graph"
+			"title": "Save graph"
 		}
 		file = tkinter.filedialog.asksaveasfilename(**settings)
-		canvas2svg.saveall(file, self.canvas)
+		canvasvg.saveall(file, self.canvas)
 
 	def exit(self):
 		window.destroy()