static void DrawLineEndAtIter(Cairo.Context cntx, TextView view, TextIter iter)
{
Gdk.Rectangle rect = view.GetIterLocation(iter);
int x, y;
view.BufferToWindowCoords(TextWindowType.Text,
rect.X,
rect.Y + rect.Height / 2,
out x, out y);
cntx.Save();
cntx.Color = GetDrawingColorForIter(view, iter);
double arrowSize = 3;
cntx.MoveTo(x + 10, y);
cntx.RelLineTo(new Cairo.Distance(0, -arrowSize));
cntx.RelMoveTo(new Cairo.Distance(0, arrowSize));
cntx.RelLineTo(new Cairo.Distance(-8, 0));
cntx.RelLineTo(new Cairo.Distance(arrowSize, arrowSize));
cntx.RelMoveTo(new Cairo.Distance(-arrowSize, -arrowSize));
cntx.RelLineTo(new Cairo.Distance(arrowSize, -arrowSize));
cntx.Stroke();
cntx.Restore();
}
static void DrawSpaceAtIter(Cairo.Context cntx, TextView view, TextIter iter)
{
Gdk.Rectangle rect = view.GetIterLocation(iter);
int x, y;
view.BufferToWindowCoords(TextWindowType.Text,
rect.X + rect.Width / 2,
rect.Y + rect.Height / 2,
out x, out y);
cntx.Save();
cntx.Color = GetDrawingColorForIter(view, iter);
//no overlap on the circle, even if context is set to LineCap.Square
cntx.LineCap = Cairo.LineCap.Butt;
cntx.MoveTo(x, y);
cntx.Arc(x, y, 0.5, 0, 2 * Math.PI);
cntx.Stroke();
cntx.Restore();
}