diff --git a/main_path.cpp b/main_path.cpp
index 3986b01..fa90f6a 100644
--- a/main_path.cpp
+++ b/main_path.cpp
@@ -60,7 +60,7 @@ double get_angle(Point start, Point end)
 
 	if (vec.y < 0)
 	{
-		angle += 180.0;
+		angle = 360 - angle;
 	}
 
 	return angle;
@@ -89,9 +89,28 @@ pair<Point, Point> perform_stroke(double stroke_size, double stroke_angle, Point
 	return result;
 }
 
+pair<Point, Point> perform_stroke(double stroke_size, double prev_angle, double curr_angle, Point point)
+{
+	pair<Point, Point> result;
+	Point add;
+	double stroke_angle;
+	double extra_angle;
+
+	extra_angle = (curr_angle - prev_angle) / 2 + 90.0;
+	stroke_angle = extra_angle + prev_angle;
+
+	add.x = cos(radians(stroke_angle)) * stroke_size / 2 / sin(radians(extra_angle));
+	add.y = sin(radians(stroke_angle)) * stroke_size / 2 / sin(radians(extra_angle));
+
+	result.first = point + add;
+	result.second = point - add;
+
+	return result;
+}
+
 void usage(const string& name)
 {
-	cout << "Usage: " << name << "<stroke size> <x1> <y1> <x2> <y2> [<xN> <yN> ...]" << endl;
+	cout << "Usage: " << name << " <stroke size> <x1> <y1> <x2> <y2> [<xN> <yN> ...]" << endl;
 	cout << "\tstroke size - how big the stroke should be" << endl;
 	cout << "\tx1 - x coordinate of first point" << endl;
 	cout << "\ty1 - y coordinate of first point" << endl;
@@ -117,7 +136,7 @@ void get_polygon(double stroke_size, const vector<Point>& points)
 		}
 		else
 		{
-			tmp = perform_stroke(stroke_size, get_stroke_angle(prev_angle, curr_angle), points[i - 1]);
+			tmp = perform_stroke(stroke_size, prev_angle, curr_angle, points[i - 1]);
 		}
 
 		forward.push_back(tmp.first);