System.Drawing.Point.Offset C# (CSharp) Method

        public void Offset(Point p) => Offset(p.X, p.Y);

        public override void Redraw(Graphics g)
        {
            if (txt == null)
                return;

            Point position = txt.GetPositionFromCharIndex(startIndex);
            Point centerPos = new Point(position.X, (int)(position.Y + (txt.Font.Size * 0.75)));
            float thirdFontSize = txt.Font.Size / 3;

            centerPos.Offset((int)thirdFontSize, 0);
            centerPos.Offset((int)thirdFontSize, 0);
            Brush brush = new SolidBrush(BrushColor);
            Pen pen = new Pen(brush);

            //the horizontal line
            Point lineEnd = new Point((int)(centerPos.X + thirdFontSize), centerPos.Y);
            g.DrawLine(pen, centerPos, lineEnd);

            //the verical line from top
            PointF verticalLineStart = new PointF(lineEnd.X, (lineEnd.Y - thirdFontSize));
            g.DrawLine(pen, verticalLineStart, lineEnd);

            //the arrow on the left pointing left
            PointF topArrowHead = new PointF(centerPos.X, (centerPos.Y - thirdFontSize));
            PointF bottomArrowHead = new PointF(centerPos.X, (centerPos.Y + thirdFontSize));
            PointF middleArrowHead = new PointF(centerPos.X - thirdFontSize, centerPos.Y);

            g.DrawPolygon(pen, new PointF[] { topArrowHead, bottomArrowHead, middleArrowHead });
            g.FillPolygon(brush, new PointF[] { topArrowHead, bottomArrowHead, middleArrowHead });
        }