protected override void OnPaint(PaintEventArgs e) { if (target == null) { return; } var zoom = this.Scale * 100 / target.Zoom; if (zoom <= float.Epsilon) { return; } //calc startPlace var r = target.VisibleRange; if (startPlace.iLine > r.Start.iLine) { startPlace.iLine = r.Start.iLine; } else { var endP = target.PlaceToPoint(r.End); endP.Offset(0, -(int)(ClientSize.Height / zoom) + target.CharHeight); var pp = target.PointToPlace(endP); if (pp.iLine > startPlace.iLine) { startPlace.iLine = pp.iLine; } } startPlace.iChar = 0; //calc scroll pos var linesCount = target.Lines.Count; var sp1 = (float)r.Start.iLine / linesCount; var sp2 = (float)r.End.iLine / linesCount; //scale graphics e.Graphics.ScaleTransform(zoom, zoom); //draw text var size = new SizeF(ClientSize.Width / zoom, ClientSize.Height / zoom); target.DrawText(e.Graphics, startPlace, size.ToSize()); //draw visible rect var p0 = target.PlaceToPoint(startPlace); var p1 = target.PlaceToPoint(r.Start); var p2 = target.PlaceToPoint(r.End); var y1 = p1.Y - p0.Y; var y2 = p2.Y + target.CharHeight - p0.Y; e.Graphics.SmoothingMode = SmoothingMode.HighQuality; using (var brush = new SolidBrush(Color.FromArgb(50, ForeColor))) using (var pen = new Pen(brush, 1 / zoom)) { var rect = new Rectangle(0, y1, (int)((ClientSize.Width - 1) / zoom), y2 - y1); e.Graphics.FillRectangle(brush, rect); e.Graphics.DrawRectangle(pen, rect); } //draw scrollbar if (scrollbarVisible) { e.Graphics.ResetTransform(); e.Graphics.SmoothingMode = SmoothingMode.None; using (var brush = new SolidBrush(Color.FromArgb(200, ForeColor))) { var rect = new RectangleF(ClientSize.Width - 3, ClientSize.Height * sp1, 2, ClientSize.Height * (sp2 - sp1)); e.Graphics.FillRectangle(brush, rect); } } needRepaint = false; }