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public void DrawAxes()
        {
            Pen ArrowPen = new Pen(_style.AxePen.Color, (float)(_style.AxePen.Width * (2.0 / 3.0)));
            Point leftX = new Point(Indent, _origin.Y);
            Point rightX = new Point(_width - Indent, _origin.Y);
            Point arrX1 = new Point(rightX.X - _indentArrow, _origin.Y - _indentArrow);
            Point arrX2 = new Point(rightX.X - _indentArrow, _origin.Y + _indentArrow);

            Point upY = new Point(_origin.X, Indent);
            Point downY = new Point(_origin.X, _height - Indent);
            Point arrY1 = new Point(_origin.X + _indentArrow, Indent + _indentArrow);
            Point arrY2 = new Point(_origin.X - _indentArrow, Indent + _indentArrow);
            _canvas.DrawLine(_style.AxePen, leftX, rightX);
            _canvas.DrawLine(_style.AxePen, downY, upY);

            _canvas.DrawLine(ArrowPen, rightX, arrX1);
            _canvas.DrawLine(ArrowPen, rightX, arrX2);
            _canvas.DrawLine(ArrowPen, upY, arrY1);
            _canvas.DrawLine(ArrowPen, upY, arrY2);

            _canvas.DrawString("0", _style.TagFont, _style.TagBrush, _origin);
            _canvas.DrawString("x", _style.TagFont, _style.TagBrush, rightX);
            _canvas.DrawString("y", _style.TagFont, _style.TagBrush, upY);

            for (int i = 0; i < 10; i++)
            {
                _canvas.DrawLine(_style.AxePen, new Point(_origin.X + i * (_width / 10), _origin.Y - _indentArrow), new     Point(_origin.X + i * (_width / 10), _origin.Y + _indentArrow));
                _canvas.DrawLine(_style.AxePen, new Point(_origin.X + _indentArrow, _origin.Y + i * (_height / 20)), new Point(_origin.X - _indentArrow, _origin.Y + i * (_height / 20)));
                _canvas.DrawLine(_style.AxePen, new Point(_origin.X + _indentArrow, _origin.Y - i * (_height / 20)), new Point(_origin.X - _indentArrow, _origin.Y - i * (_height / 20)));
            }
        }
}