GetBitmap with DocScale 0.5 gives poor quality bitmap

[Balamurali]

We need to get the bitmap from GoView with half the size. The code is given below. But the bitmap is coming with poor quality. I have attached the images files saved with DocScale 1 and 0.5. One example for quality degradation is the circles in the image created with DocScale 0.5 is not symmetric

Go diagram version used is 5.0.0.3

public virtual Bitmap GetBitmap() {

this.DocScale = 0.5;
Rectangle dispRect = this.DisplayRectangle;
Bitmap buf = new Bitmap(dispRect.Width, dispRect.Height);
Graphics gbuf = Graphics.FromImage(buf);
gbuf.ScaleTransform(this.DocScale, this.DocScale);
PointF viewLoc = this.DocPosition;
gbuf.TranslateTransform(-viewLoc.X, -viewLoc.Y);
PaintView(gbuf, new RectangleF(viewLoc, ConvertViewToDoc(dispRect.Size)));
gbuf.Dispose();
return buf;
}

[Jake]

this was handled via email, but here was my answer:

You should have better luck if you grab the initial image in higher resolution, then downscale it with smoothing. so, try Scale = 2 or 3 or 4, then do this with the image:

        var newimg = new Bitmap(newWidth, newHeight);
        using (var g = Graphics.FromImage(newimg))
        {
          g.SmoothingMode = SmoothingMode.AntiAlias;
          g.InterpolationMode = InterpolationMode.HighQualityBicubic;
          g.CompositingQuality = CompositingQuality.HighQuality;
          g.PixelOffsetMode = PixelOffsetMode.HighQuality;
          //as high quality as we can get!
          g.DrawImage(img, new Rectangle(0, 0, newWidth, newHeight));

        }

newimg is the scaled down one…
img is the one you get from GoDiagram at scale = X