From c763f723095ada3fc1c683929a410ef533cfa93d Mon Sep 17 00:00:00 2001
From: Andrew Guschin <saintruler@gmail.com>
Date: Tue, 6 Apr 2021 14:50:56 +0400
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---
 python-graphics/main.py    | 24 +++++++++++++++++++++---
 python-graphics/plotter.py |  6 ++++++
 2 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/python-graphics/main.py b/python-graphics/main.py
index fabdd92..177bf3f 100644
--- a/python-graphics/main.py
+++ b/python-graphics/main.py
@@ -2,7 +2,10 @@ import tkinter as tk
 from tkinter import filedialog as fd
 from tkinter import ttk
 
-from plotter import plot_preset, plot_points
+from plotter import plot_preset, plot_points, plot_user
+
+from sympy.parsing.sympy_parser import parse_expr
+from sympy.plotting import plot
 
 
 class PlotType:
@@ -193,13 +196,26 @@ class UserPlotFrame(tk.Frame):
         self.create_widgets()
 
     def create_widgets(self):
-        pass
+        self.label = tk.Label(self)
+        self.label["text"] = "Введите выражение:"
+        self.label.grid(row=0, column=0, rowspan=1, columnspan=1, sticky=tk.W)
+
+        self.text = tk.Entry(self)
+        self.text.grid(row=1, column=0, sticky=tk.NSEW)
 
     def show(self):
         self.grid(row=0, column=0, columnspan=1, rowspan=2, sticky=tk.NSEW)
+        grid_conf(self, 2, 1)
 
     def collect_info(self):
-        return {"status": "ok", "graph": "user"}
+        expr_text = self.text.get()
+        try:
+            expr = parse_expr(expr_text)
+            plot(expr, show=False)
+        except:
+            return {"status": "error", "message": "Не удалось обработать выражение"}
+
+        return {"status": "ok", "graph": "user", "expr": expr}
 
 
 class PointPlotFrame(tk.Frame):
@@ -349,6 +365,8 @@ class App(tk.Frame):
                 plot_preset(info)
             elif info["graph"] == "point":
                 plot_points(info)
+            elif info["graph"] == "user":
+                plot_user(info)
             else:
                 print(info)
 
diff --git a/python-graphics/plotter.py b/python-graphics/plotter.py
index b2bc029..6ab8275 100644
--- a/python-graphics/plotter.py
+++ b/python-graphics/plotter.py
@@ -1,4 +1,5 @@
 import matplotlib.pyplot as plt
+from sympy.plotting import plot
 import numpy as np
 
 
@@ -58,3 +59,8 @@ def plot_points(data):
 
     # show the plot
     plt.show()
+
+
+def plot_user(data):
+    plot(data["expr"])
+
-- 
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