protected override bool OnExposeEvent(Gdk.EventExpose args)
{
//base.OnPaint(pe);
Cairo.Context dc = Gdk.CairoHelper.Create(args.Window);
// Draw white background
//Graphics dc = pe.Graphics;
dc.IdentityMatrix();
dc.SetSourceRGB(1.0, 1.0, 1.0);
dc.Rectangle(0, 0, Allocation.Width, Allocation.Height);
dc.Fill();
// Draw the raster
Cairo.Matrix t = TheRasterModel.GetTikzToScreenTransform().ToCairoMatrix();
//t.Freeze();
dc.Save();
dc.LineWidth = 0.01; // todo: always 1 pixel
dc.SetSourceRGB(0.7, 0.7, 0.7); // whitesmoke?
{
dc.Transform(t);
TheRasterModel.DrawRaster(
(p1, p2) => { dc.MoveTo(p1.X, p1.Y); dc.LineTo(p2.X, p2.Y); dc.Stroke(); },
(r1, r2) =>
{
dc.DrawEllipse(0, 0, 2 * r1, 2 * r2);
});
}
dc.Restore();
// draw unavailable note
if (TheDisplayModel.IsUnavailable)
{
dc.SetSourceRGB(0, 0, 0);
dc.SelectFontFace("Arial", Cairo.FontSlant.Normal, Cairo.FontWeight.Normal);
//StringFormat f = new StringFormat();
//f.Alignment = StringAlignment.Center;
//f.LineAlignment = StringAlignment.Center;
//dc.DrawString("<Unavailable>", new Font("Arial", 16), Brushes.Black, ClientRectangle, f);
dc.MoveTo(Allocation.Width / 2, Allocation.Height / 2); //todo
dc.ShowText("<Unavailable>");
}
// draw the pdf image
if (TheDisplayModel.IsImageVisible && TheDisplayModel.Bmp != null)
{
Point p = new Point((Allocation.Width - TheDisplayModel.Bmp.Width) / 2, (Allocation.Height - TheDisplayModel.Bmp.Height) / 2);
//dc.DrawImageUnscaled(TheDisplayModel.Bmp, p);
dc.SetSource(TheDisplayModel.Bmp, p.X, p.Y);
//dc.Rectangle(p.X, p.Y, TheDisplayModel.Bmp.Width, TheDisplayModel.Bmp.Height);
dc.Paint();
}
// draw the overlay
if (ShowOverlay)
{
dc.SetSourceRGB(0, 0, 0);
// draw shapes from parsetree
foreach (var osv in OSViews)
{
osv.Draw(dc);
}
// draw (visible) auxiliary shapes
foreach (var ps in PreviewShapes.Where(o => o.Visible))
{
ps.Draw(dc);
}
}
// draw adorner(s)
foreach (var scope in this.OSViews.OfType <OverlayScopeView>().Where(v => v.IsAdornerVisible))
{
dc.SetSourceRGB(0.5, 0.5, 0.5);
dc.LineWidth = 5;
System.Windows.Rect ShowAt = scope.GetBB(Allocation.Height);
ShowAt.Inflate(6, 6);
dc.Rectangle(ShowAt.ToCairoRectangle()); //(PensAndBrushes.AdornerPen, ShowAt.ToRectangleF());
dc.Stroke();
}
// draw the object marker
if (MarkObject_ShowMarker && MarkObject_Marked != null)
{
System.Windows.Rect ShowAt = MarkObject_Marked.GetBB(Allocation.Height);
ShowAt.Inflate(15, 15);
//using (Pen p = new Pen(Brushes.Red, 6))
{
dc.SetSourceRGB(1, 0, 0);
dc.LineWidth = 6;
dc.DrawEllipse(ShowAt);//p,
}
}
((IDisposable)dc.Target).Dispose();
((IDisposable)dc).Dispose();
return(true);
}
