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;
}
